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学者姓名：李易
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摘要 ：
Buckling -restrained braces (BRBs) can mitigate the uneven inter -story drifts of vertically irregular steel frame structures during earthquakes, preventing unfavorable seismic forces and failure patterns. However, the structural lateral displacement profile of vertically irregular steel buckling -restrained braced frame structures (VSBFSs) can hardly be predicted; hence, parameter tuning and iterative designing are commonly required in conventional direct displacement -based design (DDBD) methods, which strongly rely on the experience of designers and consumes a considerable amount of time. This study proposes a substructure -based design (SBD) method developed explicitly for VSBFSs. In this method, the substructures of every story of a VSBFS are separated from the entire structure and individually analyzed in the subsequent procedures. The boundary conditions of the substructures are initially simplified as hinges, and an explicit equation of BRB stiffness and inter -story drift for the substructures is established. An iterative calculation procedure is consequently applied to correct the equation by considering the influence of the constraints of adjacent stories. In this manner, the inter -story drifts of all the stories of the entire structure uniformly converge to the predetermined targets, in which the demand of BRBs for each story is also determined. Compared with conventional DDBD methods, the proposed method does not assume the structural lateral displacement profile and is not based on experience, yielding relatively economical and safe design outcomes in a timely manner. The proposed SBD method was first validated by comparing it with existing elastic and elastoplastic design methods through a 15 -story VSBFS example. Then, the applicability of the SBD method was further explored through four 6 -story VSBFSs with different plan layout reductions and two VSBFSs with heights of 20 stories and 30 stories. Finally, the SBD method was applied to redesign the BRBs of a vertically irregular thermal power plant model (an example of a VSBFS) in a shaking table test.
关键词 ：
Buckling-restrained brace Buckling-restrained brace Iterative calculation procedure Iterative calculation procedure Numerical validation Numerical validation Vertically irregular steel frame structures Vertically irregular steel frame structures Substructure-based design Substructure-based design
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| GB/T 7714 | Li, Zhenyu , Cheng, Xiaowei , Li, Yi et al. Substructure-based design method for vertically irregular steel buckling-restrained braced frame structures [J]. | ENGINEERING STRUCTURES , 2024 , 306 . |
| MLA | Li, Zhenyu et al. "Substructure-based design method for vertically irregular steel buckling-restrained braced frame structures" . | ENGINEERING STRUCTURES 306 (2024) . |
| APA | Li, Zhenyu , Cheng, Xiaowei , Li, Yi , Gao, Xiangyu . Substructure-based design method for vertically irregular steel buckling-restrained braced frame structures . | ENGINEERING STRUCTURES , 2024 , 306 . |
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摘要 ：
The utilization of waste rubber as aggregates shows both environmentally friendly features and high costefficiency in construction, but may cause poor workability such as rubber flotation and agglomeration. To address the above issues, the pelletization method was adopted to produce rubberized artificial geopolymer aggregates (R-GPA), and the effects of different rubber modification methods and rubber contents were investigated through pelletization technologies, mechanical tests, X-ray computed tomography (XCT) and backscattered electron with energy-dispersive spectroscopy (BSE-EDS). Results showed that the combined modification with NaOH solution and silane coupling agent presented the most effective surface modification efficiency. According to microscopic analysis, rubber modification could effectively enhance the rubber-matrix interface. The produced R-GPA could thus possess an oven-dried particle density within 1500-1800 kg/m3, a water absorption of 7%-10.5%, and a pelletization efficiency over 98%, which provided a new insight into the value-added utilization of waste rubber and the promotion of artificial aggregate technologies.
关键词 ：
Surface modification Surface modification Interface Interface Pelletization Pelletization Rubber Rubber Alkali-activated materials Alkali-activated materials Geopolymer aggregates (GPA) Geopolymer aggregates (GPA)
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| GB/T 7714 | Wang, Hui , Qian, Lan-Ping , Xu, Ling-Yu et al. Upcycling of waste rubber using pelletized artificial geopolymer aggregate technology [J]. | DEVELOPMENTS IN THE BUILT ENVIRONMENT , 2024 , 20 . |
| MLA | Wang, Hui et al. "Upcycling of waste rubber using pelletized artificial geopolymer aggregate technology" . | DEVELOPMENTS IN THE BUILT ENVIRONMENT 20 (2024) . |
| APA | Wang, Hui , Qian, Lan-Ping , Xu, Ling-Yu , Li, Yi , Guan, Hong . Upcycling of waste rubber using pelletized artificial geopolymer aggregate technology . | DEVELOPMENTS IN THE BUILT ENVIRONMENT , 2024 , 20 . |
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摘要 ：
Improving the integrity of precast concrete (PC) frame structures using dry connections is essential for enhancing their robustness against progressive collapse. Therefore, three PC beam-column assemblies using different dry connections specially designed to ensure the connectivity were experimentally examined under progressive collapse scenarios. And a seven-point loading tree device was adopted to simulate the uniformly distributed loading conditions in practical engineering. The connection details were classified as follows: normal top-andseat angle connection in TSA, strengthened top-and-seat angle connection in STSA, and strengthened top-andseat angle with high ductility longitudinal reinforcements in the plastic regions in DSTSA. Under small deformations, STSA had the highest first peak load attributable to its strengthened joint connection. TSA obtained a lower load than that of STSA because of the low joint connection stiffness. Meanwhile, DSTSA achieved the lowest load among the three specimens because the smoother surface of the high-ductility reinforcements (compared with that of normal ones) weakened its bond to the concrete. However, under large deformations, the high ductility of the reinforcements ensured the specimen integrity; consequently, the largest final load was achieved in DSTSA. On the contrary, the high joint stiffness and normal reinforcements in STSA hindered the beam end rotation, and the steel angle failed early in TSA. As a result, the two connections failed to ensure the specimen integrity. To further shed light on the resistance mechanisms of beam-column assemblies under the uniformly distributed loading condition, an iteration-based model was developed to calculate the first peak load under the beam and compressive arch actions. The maximum prediction error achieved was 12%. Based on the model, the load contribution from the friction effect of the loading device was identified as 27%. And it was found that during the collapse, increasing reinforcement deformation region that might be induced by slippage between the concrete and reinforcements could lead to a continuous increase in the horizontal reaction force after the specimen reaching the first peak load.
关键词 ：
Resistance calculation model Resistance calculation model Uniformly distributed loading condition Uniformly distributed loading condition Dry connection Dry connection Precast concrete frame structures Precast concrete frame structures Progressive collapse Progressive collapse
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| GB/T 7714 | Zhao, Zidong , Cheng, Xiaowei , Li, Yi et al. Progressive collapse resistance of precast concrete beam-column assemblies using dry connections under uniformly distributed loading condition [J]. | ENGINEERING STRUCTURES , 2024 , 306 . |
| MLA | Zhao, Zidong et al. "Progressive collapse resistance of precast concrete beam-column assemblies using dry connections under uniformly distributed loading condition" . | ENGINEERING STRUCTURES 306 (2024) . |
| APA | Zhao, Zidong , Cheng, Xiaowei , Li, Yi , Diao, Mengzhu , Guan, Hong , Zhang, Weijing et al. Progressive collapse resistance of precast concrete beam-column assemblies using dry connections under uniformly distributed loading condition . | ENGINEERING STRUCTURES , 2024 , 306 . |
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摘要 ：
When an explosion occurs within reinforced concrete shear wall (RCSW) structures, the overpressures and duration of blast loads will be amplified by the confining effects of enclosed walls, which can cause more severe damage to the structure than a free air explosion (FAE). However, research on RCSW structures subjected to internal explosions (IEs) are still limited and no benchmark tests exist. To provide a benchmark for studying the blast resistance of RCSW structures subjected to IEs, three Trinitrotoluene (TNT) IE field tests were conducted in this study on a 2 -story, 3 x 3-bay, 1/3 scaled RCSW substructure, in which the overpressures, displacements, and crack patterns of RCSWs were recorded. The three tests were performed consecutively after each other on the same structure at TNT loads of 95.3 g (Test -1), 253 g (Test -2), and 400 g (Test -3). The test results showed that the floor slab directly above the explosion and one of the RCSW confining the explosion failed in flexure (i.e., the support rotation angle exceeds 2 degrees ) in Test -2 with the scaled distance of 1.53, whilst the other three neighboring RCSWs failed in flexure in Test -3 with the scaled distance of 1.31. In addition, a detailed finite element model was established using LS-DYNA and was validated against the test results. The numerical simulation results showed that the energy released from TNT in IE scenarios (14.5 GJ/m 3 ) was 1.95 times that in FAE scenarios (7.43 GJ/m 3 ). The total blast loads applied to the RCSWs increased with the decrease of the area of opening. The average impulse applied to the four RCSWs were similar in IE scenarios, and the average impulse could be represented by the impulse at the center of each of the RCSWs (excluding the RCSW with window opening, as the opening is at the center). The shock and gas overpressure impulses at the center of RCSWs accounted for approximately 19.4 % and 80.6 % of the total impulse, respectively. Furthermore, the peak overpressures at the wall centers and the total blast loads experienced by the RCSWs under IE scenarios were 1.79 times and 11.13 times higher than those under FAE scenarios, respectively. This was due to the confinement of enclosed walls under IE scenarios. Consequently, the displacements and damage levels of the RCSW substructure under IE scenarios were much larger than those under FAE scenarios.
关键词 ：
Free air explosion Free air explosion Numerical simulation Numerical simulation Structural damage Structural damage Field test Field test Reinforced concrete shear wall building Reinforced concrete shear wall building Average impulse Average impulse structure structure Peak overpressure Peak overpressure Internal TNT explosion Internal TNT explosion
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| GB/T 7714 | Guo, Xuekang , Li, Yi , McCrum, Daniel P. et al. A reinforced concrete shear wall building structure subjected to internal TNT explosions: Test results and numerical validation [J]. | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 190 . |
| MLA | Guo, Xuekang et al. "A reinforced concrete shear wall building structure subjected to internal TNT explosions: Test results and numerical validation" . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 190 (2024) . |
| APA | Guo, Xuekang , Li, Yi , McCrum, Daniel P. , Hu, Yutao , Bai, Zhun , Zhang, Haoyou et al. A reinforced concrete shear wall building structure subjected to internal TNT explosions: Test results and numerical validation . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 190 . |
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摘要 ：
In modern civil engineering, advanced concrete materials are expected to not only possess excellent mechanical and durability properties but also exhibit additional functions. Waste-derived artificial aggregate (AA) is an innovative designable aggregate type with high sustainability and value-added properties. This study provided a comprehensive literature review on the functionalization of designable AA for the first time. The intrinsic characteristics of AA that are potential for realizing its functionalization were first introduced, where the AA's porous structure and chemical reactivity were ideal for internal curing, self-healing, purification, or foamed concrete application. Then, the functionalities of AA through encapsulating modification materials were discussed, where encapsulating AA with polymers or bacteria could enhance self-healing, combining AA with phase change materials allowed for energy efficiency, and adding additives like carbon fiber or magnetite could offer AA with conductivity and electromagnetic shielding characteristics. Additionally, the structural designs of AA for improved functions were summarized, where core-shell and hollow designs in AA could improve heavy metal immobilization and create cavities for specialized applications. Finally, the future perspectives of the AA functionalization technology were proposed. The contributions of this review could provide helpful guidelines for the future development, promotion, and practical applications of sustainable AA with additional functions.
关键词 ：
Artificial aggregate (AA) Artificial aggregate (AA) Functionalization Functionalization Absorption Absorption Energy storage Energy storage Conductivity Conductivity Self-healing Self-healing
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| GB/T 7714 | Qian, Lan-Ping , Xu, Ling-Yu , Huang, Bo-Tao et al. Functionalization of waste-derived artificial aggregates: A state-of-the-art review [J]. | RESOURCES CONSERVATION AND RECYCLING , 2024 , 212 . |
| MLA | Qian, Lan-Ping et al. "Functionalization of waste-derived artificial aggregates: A state-of-the-art review" . | RESOURCES CONSERVATION AND RECYCLING 212 (2024) . |
| APA | Qian, Lan-Ping , Xu, Ling-Yu , Huang, Bo-Tao , Li, Yi , Lan, Jirong , Gong, Fuyuan et al. Functionalization of waste-derived artificial aggregates: A state-of-the-art review . | RESOURCES CONSERVATION AND RECYCLING , 2024 , 212 . |
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摘要 ：
Progressive structural collapse is a typical low-probability high-consequence event. Progressive collapse design can effectively improve the robustness of structures against accidental local damage and reduce the probability of collapse. However, progressive collapse design also increases the construction cost of buildings. Hence, it is necessary to conduct cost-benefit analyses for the progressive collapse design of building structures. This study first designs a reinforced concrete (RC) frame based on a progressive collapse design program that simultaneously optimizes material consumption and structural resistance. Then, the structural failure probability is quantified using an alternative path (AP) method-based fragility analysis that considers the structural uncertainties. Based on this, the life cycle costs and benefits of the structure designed with different design load factors are investigated. A four-story RC frame is used as an example. By considering the time value of money and threat probability, the break-even points and optimized design load factors for the progressive collapse design of the RC frame are analyzed. These research outcomes can help promote progressive collapse design in engineering practice and provide references for proposing scientific and reasonable design load factors.
关键词 ：
Life-cycle Life-cycle Design optimization Design optimization Design load factor Design load factor Progressive collapse Progressive collapse Cost-benefit analysis Cost-benefit analysis
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| GB/T 7714 | Lin, Kaiqi , Zheng, Junhao , Wu, Zewei et al. Risk-based life cycle cost-benefit analysis for progressive collapse design of RC frame structures [J]. | STRUCTURES , 2024 , 63 . |
| MLA | Lin, Kaiqi et al. "Risk-based life cycle cost-benefit analysis for progressive collapse design of RC frame structures" . | STRUCTURES 63 (2024) . |
| APA | Lin, Kaiqi , Zheng, Junhao , Wu, Zewei , Lu, Xinzheng , Li, Yi . Risk-based life cycle cost-benefit analysis for progressive collapse design of RC frame structures . | STRUCTURES , 2024 , 63 . |
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摘要 ：
A vast city usually encompasses hundreds of thousands or even millions of buildings, majority of which are regular buildings with typical structural configurations. In the seismic damage simulation of cities, efficient and reliable simplified models are required to represent these buildings. A numerical model database of typical regular reinforced concrete (RC) frame structures was developed, utilizing shear models to simulate these RC frame structures. In contrast to existing shear models that are automatically generated based solely on the fundamental rules regulated by the theories of structures and the design codes, the shear models in this study were calibrated using refined numerical models to guarantee precise depiction of RC frame structures. The effects of reinforcement corrosion and the year of construction on structural performance were also considered. First, 108 RC frame structures were designed with typical configurations, strictly adhering to the regulations of design codes. Second, the refined models of the RC frame structures were established with modified material parameters to account for reinforcement corrosion, resulting in 540 refined models. Afterward, the parameters of each shear model were calibrated through cyclic pushover analysis of the corresponding refined numerical model. Finally, the characteristic points of the shear models were further modified to consider the different redundant capacities of the structures constructed in three time phases due to the update of design codes, by which a simplified numerical model database containing 1620 shear models was developed. The models ' accuracy in predicting fundamental periods and seismic damage states was verified by comparing them to the refined models and three real RC frame buildings. The effects of the reinforcement corrosion and year of construction on the seismic damage states of the RC frame structures were also discussed. The developed numerical model database can be utilized for the seismic damage assessment of RC frame structures in urban building clusters.
关键词 ：
Reinforcement corrosion Reinforcement corrosion Rapid seismic damage assessment Rapid seismic damage assessment Year of construction Year of construction Typical regular reinforced concrete frame Typical regular reinforced concrete frame Simplified shear model Simplified shear model
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| GB/T 7714 | Song, Xiaoyan , Cheng, Xiaowei , Li, Yi et al. A numerical model database for rapid seismic damage assessment of typical regular reinforced concrete frame structures in urban building clusters [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
| MLA | Song, Xiaoyan et al. "A numerical model database for rapid seismic damage assessment of typical regular reinforced concrete frame structures in urban building clusters" . | JOURNAL OF BUILDING ENGINEERING 90 (2024) . |
| APA | Song, Xiaoyan , Cheng, Xiaowei , Li, Yi , Guo, Ruijie , Zhang, Haoyou , Liang, Zihan et al. A numerical model database for rapid seismic damage assessment of typical regular reinforced concrete frame structures in urban building clusters . | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
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摘要 ：
Progressive collapse research of concrete flat plate structures, typically investigated through the alternate path (AP) method with a focus on column failure (removal), has often neglected the facts of real-life collapse events which are caused by slab overloading, leading to initial punching shear failure at slab-column joints. Progressive collapse of the structural systems triggered by slab-column joint failures exhibits distinct failure modes and resistance mechanisms from those triggered by column failures. Building upon our initial tests on the overloaded slab specimen under quasi-static loading regimes, this paper presents an innovative experimental study that closely mirrors the load-resistant mechanisms of the most common collapse incidents in flat plate structure systems in the real world. By successively stacking up gravity loads without additional interventions, the test accurately simulates the spontaneous failure conditions typical of flat plate structures. A key discovery of this research is the identification of a unique reversing load redistribution mechanism, a phenomenon not previously observed in our slab overloading tests or in studies focused on column removal scenarios. This discovery highlights the necessity of enhancing the post-punching capacity at the slab-column joints as a critical factor in preventing collapses due to slab overloading. In addition, this study provides an in-depth examination of the dynamic effects inherent in the progressive collapse of flat plate structures. Evaluating the dynamic increase factor and load amplification factor offers supplementary data pertinent to real-world collapses, providing essential insights for improving the resilience of flat plate structures against initial joint failure due to slab overloading.
关键词 ：
mechanism mechanism Load-resisting Load-resisting Progressive Collapse Progressive Collapse Flat plate structures Flat plate structures Overloading scenario Overloading scenario Experimental test Experimental test
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| GB/T 7714 | Yang, Zhi , Guo, Xuekang , Li, Yi et al. Real collapse responses of an RC flat plate structure under extreme overloading condition: Reversing load redistribution [J]. | ENGINEERING STRUCTURES , 2024 , 322 . |
| MLA | Yang, Zhi et al. "Real collapse responses of an RC flat plate structure under extreme overloading condition: Reversing load redistribution" . | ENGINEERING STRUCTURES 322 (2024) . |
| APA | Yang, Zhi , Guo, Xuekang , Li, Yi , Guan, Hong , Diao, Mengzhu , Gilbert, Benoit P. et al. Real collapse responses of an RC flat plate structure under extreme overloading condition: Reversing load redistribution . | ENGINEERING STRUCTURES , 2024 , 322 . |
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摘要 ：
In the progressive collapse, the structural topology changed dynamically as failures propagate. Representing reinforced concrete (RC) frames with graph data leverages the topology of beam-column joints and structural components, enabling graph neural networks (GNNs) to predict the failure propagation. Graph convolutional networks (GCNs), a specific type of GNN, offer superior computational efficiency for graph data to traditional GNNs. However, three challenges must be addressed for GCNs to rapidly assess collapse regions: (1) insufficient data, (2) lack of graph representations for structural collapse, and (3) absence of tailored GCN architectures. To address these gaps, this study focused on RC frames with the following initiatives: (1) an efficient and accurate method for generating progressive collapse data was developed; (2) joint-based representation and componentbased representation were established, accompanied by a method for converting RC frames into these representations; (3) two GCN architectures were designed to identify failure paths and predicting collapse regions. The performance of the GCN models using various convolutional layer configurations was evaluated on the two graph representations, and the CGR-based model using SAGEConv layers exhibited the best performance with an accuracy and F1 score of 0.9839 and 0.8853, respectively. The proposed method exhibited over a 99 % improvement in calculation efficiency and approximately a 75 % reduction in memory usage compared with traditional FEM. Moreover, it captured the contribution of each component to progressive collapse resistance with better accuracy than previous approaches. Finally, this method was employed to predict the internal and external collapse regions of a real-world structure by incorporating a physics engine-based approach from prior studies.
关键词 ：
Collapse region Collapse region Progressive collapse Progressive collapse RC frame structure RC frame structure GCN GCN Rapid assessment Rapid assessment
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| GB/T 7714 | Wang, Senna , Cheng, Xiaowei , Li, Yi et al. Assessing progressive collapse regions of reinforced concrete frame structures using Graph Convolutional Networks [J]. | ENGINEERING STRUCTURES , 2024 , 322 . |
| MLA | Wang, Senna et al. "Assessing progressive collapse regions of reinforced concrete frame structures using Graph Convolutional Networks" . | ENGINEERING STRUCTURES 322 (2024) . |
| APA | Wang, Senna , Cheng, Xiaowei , Li, Yi , Yang, Xiaohua , Zhang, Haoyou , Guo, Ruijie et al. Assessing progressive collapse regions of reinforced concrete frame structures using Graph Convolutional Networks . | ENGINEERING STRUCTURES , 2024 , 322 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Progressive collapse, usually caused by accidental or abnormal loading, is a structural failure disproportionate to its original cause. Reinforced concrete (RC) flat plate structures are vulnerable to brittle punching shear failure in the vicinity of slab-column joints, which may initiate disastrous progressive collapse causing significant economic, social, and psychological consequences. This paper presents a series of experimental investigations of twenty-one 1/3-scaled slab-column joint specimens with in-plane restraints, under opposite punching shear directions, and subject to concentric and eccentric loading conditions. Three design parameters (slab thickness, reinforcement ratio, and flexural reinforcement extension) and three strengthening methods (embedded beams, stirrups in punching area, and ring beams) were considered. The load-resisting and deformation capacities of the joints, as well as their punching shear and post-punching failure behaviours were examined in detail. In addition to the experimental studies, numerical modelling techniques were also developed to simulate the physical tests with emphasis on their load-displacement responses, punching shear and post-punching capacities and crack development. Results demonstrate that (1) the punching shear capacity is mainly governed by the geometrical dimensions of the slab; (2) the post-punching strength is primarily regulated by the integrity rebars going through the column. The continuous integrity rebars are imperative for activating tensile membrane action thereby enhancing post-punching capacity in progressive collapse events.
关键词 ：
Post-punching failure Post-punching failure Punching shear failure Punching shear failure Load resistance Load resistance RC flat plate systems RC flat plate systems Slab-column joints Slab-column joints
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| GB/T 7714 | Diao, Mengzhu , Guan, Hong , Xue, Huizhong et al. Load-Resistant Mechanism and Failure Behaviour of RC Flat Plate Slab-Column Joints Under Concentric and Eccentric Loading [J]. | PROCEEDINGS OF THE 17TH EAST ASIAN-PACIFIC CONFERENCE ON STRUCTURAL ENGINEERING AND CONSTRUCTION, EASEC-17 2022 , 2023 , 302 : 917-928 . |
| MLA | Diao, Mengzhu et al. "Load-Resistant Mechanism and Failure Behaviour of RC Flat Plate Slab-Column Joints Under Concentric and Eccentric Loading" . | PROCEEDINGS OF THE 17TH EAST ASIAN-PACIFIC CONFERENCE ON STRUCTURAL ENGINEERING AND CONSTRUCTION, EASEC-17 2022 302 (2023) : 917-928 . |
| APA | Diao, Mengzhu , Guan, Hong , Xue, Huizhong , Li, Yi , Lu, Xinzheng . Load-Resistant Mechanism and Failure Behaviour of RC Flat Plate Slab-Column Joints Under Concentric and Eccentric Loading . | PROCEEDINGS OF THE 17TH EAST ASIAN-PACIFIC CONFERENCE ON STRUCTURAL ENGINEERING AND CONSTRUCTION, EASEC-17 2022 , 2023 , 302 , 917-928 . |
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