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Dynamic response and collapse resistance of RC flat plate structures subjected to instantaneous removal of an interior column SCIE
期刊论文 | 2022 , 264 | ENGINEERING STRUCTURES
WoS核心集被引次数: 16
摘要&关键词 引用

摘要 :

Through quasi-static loading regimes, notable research efforts have been made in recent years towards understanding the structural behaviour and resistance mechanism of reinforced concrete (RC) flat plate structures against progressive collapse events. Nevertheless, dynamic responses, being an inherent nature of any progressive collapse, were unable to be adequately studied in these quasi-static studies. Moreover, fewer studies were performed on flat plate structures under dynamic loading conditions, especially their behaviours under large deformations, i.e., the post-punching stages. To fill this research gap, this paper presents three sequential dynamic tests performed on a 1/3-scaled 2 x 2-bay RC flat plate substructure specimen by instantaneously removing the interior column under three levels of additional gravity loads. In these tests, the substructure specimen was able to withstand the gravity loads up to 2.08 times the load capacities recommended by the DoD and GSA guidelines for nonlinear dynamic analyses. The dynamic responses of the specimen in the flexural, punching and post-punching stages were examined in detail. In addition, a high-fidelity finite element model was developed and validated by the experimental test results. The validated numerical model was subsequently used to quantify the dynamic load redistribution patterns, and the influences of two loading considerations (i.e., loading on the slab overhangs and load release time) on the dynamic responses were also investigated. Finally, the dynamic load increase effects were evaluated based on the analysis model results. The obtained load-based dynamic increase factors (DIFs) of the specimen under different gravity loads were between 1.11 and 1.46 in the pre-punching (flexural) stage, whereas they were no more than 1.06 in the post-punching stage.

关键词 :

Dynamic response Dynamic response Flat plate structure Flat plate structure Punching shear Punching shear Progressive collapse Progressive collapse

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GB/T 7714 Yang, Zhi , Li, Yi , Guan, Hong et al. Dynamic response and collapse resistance of RC flat plate structures subjected to instantaneous removal of an interior column [J]. | ENGINEERING STRUCTURES , 2022 , 264 .
MLA Yang, Zhi et al. "Dynamic response and collapse resistance of RC flat plate structures subjected to instantaneous removal of an interior column" . | ENGINEERING STRUCTURES 264 (2022) .
APA Yang, Zhi , Li, Yi , Guan, Hong , Diao, Mengzhu , Gilbert, Benoit P. , Sun, Hailin et al. Dynamic response and collapse resistance of RC flat plate structures subjected to instantaneous removal of an interior column . | ENGINEERING STRUCTURES , 2022 , 264 .
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Pre- and post-punching failure performances of flat slab-column joints with drop panels and shear studs SCIE
期刊论文 | 2022 , 140 | ENGINEERING FAILURE ANALYSIS
WoS核心集被引次数: 7
摘要&关键词 引用

摘要 :

To investigate the pre-and post-punching failure performances of flat slab-column joints with drop panels and shear studs, static loading tests were conducted on three joint specimens sub-jected to in-plane restraints. The pre-and post-punching failure modes and load capacities of the joints were analysed. The tests identified successive punching failures at two critical regions (column perimeter and slab-drop panel interface) in all three joints. Compared with the specimen with a drop panel only, installing shear studs within the drop panels contributed to improving the punching shear strength. Although the post-punching capacity was not significantly improved, utilisation of shear studs effectively increased the ductility of the joints, rendering the punching failure around the column area more ductile. Punching shear strength validation against the international design codes reveals that they were conservative for the specimen with a drop panel only but overestimated for specimens with drop panels and shear studs.

关键词 :

Slab-column joint Slab-column joint Drop panel Drop panel Pre- and post-punching failure modes Pre- and post-punching failure modes Shear stud Shear stud Pre- and post-punching strengths Pre- and post-punching strengths

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GB/T 7714 Jiao, Ziyang , Li, Yi , Guan, Hong et al. Pre- and post-punching failure performances of flat slab-column joints with drop panels and shear studs [J]. | ENGINEERING FAILURE ANALYSIS , 2022 , 140 .
MLA Jiao, Ziyang et al. "Pre- and post-punching failure performances of flat slab-column joints with drop panels and shear studs" . | ENGINEERING FAILURE ANALYSIS 140 (2022) .
APA Jiao, Ziyang , Li, Yi , Guan, Hong , Diao, Mengzhu , Yang, Zhi , Wang, Junkun et al. Pre- and post-punching failure performances of flat slab-column joints with drop panels and shear studs . | ENGINEERING FAILURE ANALYSIS , 2022 , 140 .
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Post-punching failure mechanism and resistance of flat plate-column joints with in-plane constraints SCIE
期刊论文 | 2022 , 138 | ENGINEERING FAILURE ANALYSIS
WoS核心集被引次数: 8
摘要&关键词 引用

摘要 :

Flat plate-column joints with in-plane constraints exhibit a suspension mechanism under large deformations after punching shear failure, which significantly affects the progressive collapse behavior of the entire flat plate structural systems. However, in-plane constraints were ignored in the existing tests by which the suspension mechanism could not be exhibited and consequently the post-punching resistance was significantly underestimated. To fill this gap, a static pushdown test was conducted on eight flat plate-column joints with in-plane constraints until their post punching resistances being completely lost. The influences of the punching directions and the structural parameters including slab thickness, reinforcement amounts and arrangement of flexural reinforcement on the post-punching failure mechanism were analyzed. An analytical method for calculating the post-punching strength was proposed and validated by the test results. The contributions of each layer of reinforcement to the post-punching resistance were also quantified.

关键词 :

In-plane constraints In-plane constraints Flat plate-column joints Flat plate-column joints Post-punching failure mechanism Post-punching failure mechanism Collapse resistance Collapse resistance Analytical calculation Analytical calculation

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GB/T 7714 Yang, Youzhe , Diao, Mengzhu , Li, Yi et al. Post-punching failure mechanism and resistance of flat plate-column joints with in-plane constraints [J]. | ENGINEERING FAILURE ANALYSIS , 2022 , 138 .
MLA Yang, Youzhe et al. "Post-punching failure mechanism and resistance of flat plate-column joints with in-plane constraints" . | ENGINEERING FAILURE ANALYSIS 138 (2022) .
APA Yang, Youzhe , Diao, Mengzhu , Li, Yi , Guan, Hong , Lu, Xinzheng . Post-punching failure mechanism and resistance of flat plate-column joints with in-plane constraints . | ENGINEERING FAILURE ANALYSIS , 2022 , 138 .
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Progressive Collapse Resistance of Emulative Precast Concrete Frames with Various Reinforcing Details SCIE
期刊论文 | 2021 , 147 (8) | JOURNAL OF STRUCTURAL ENGINEERING
WoS核心集被引次数: 10
摘要&关键词 引用

摘要 :

In this paper, three precast concrete (PC) frames and one cast-in-situ reinforced-concrete (RC) frame were cast and tested to investigate the load-resisting mechanisms of emulative PC frames with various reinforcing details to resist progressive collapse. In the beams of PC frames, the top reinforcement was continuous without curtailment while the bottom reinforcement had different anchorage strength. Test results indicated that, in the event of middle column removal, similar to RC frame, beam action, compressive arch action (CAA), and tensile catenary action (TCA) could be developed sequentially in PC frames with emulative connections, PC frames with sufficient anchorage strength or additional bottom U-shaped bars passing through the middle joint could obtain similar level of CAA capacity as RC frame. However, they may achieve relatively lower TCA capacity due to higher bond strength between the top reinforcement and cast-in-situ topping layer in beams, owing to higher concrete strength in the topping layer, resulting in earlier fracture of the beam top reinforcements. Conversely, PC frames with insufficient anchorage could achieve comparable TCA capacity as RC frame. However, their CAA capacity was less than that of RC frames due to pulling-out failure of bottom reinforcements, preventing further development of strain hardening at beam action and CAA stages. Based on test results and analytical studies, it was found that, similar to RC frames, PC frames with emulative connections could provide sufficient rotational capacity to ensure development of tie-force as required by the design guidelines. (C) 2021 American Society of Civil Engineers.

关键词 :

Precast concrete Precast concrete Emulative connection Emulative connection Progressive collapse Progressive collapse Experimental tests Experimental tests

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GB/T 7714 Qian, Kai , Liang, Shi-Lin , Fu, Feng et al. Progressive Collapse Resistance of Emulative Precast Concrete Frames with Various Reinforcing Details [J]. | JOURNAL OF STRUCTURAL ENGINEERING , 2021 , 147 (8) .
MLA Qian, Kai et al. "Progressive Collapse Resistance of Emulative Precast Concrete Frames with Various Reinforcing Details" . | JOURNAL OF STRUCTURAL ENGINEERING 147 . 8 (2021) .
APA Qian, Kai , Liang, Shi-Lin , Fu, Feng , Li, Yi . Progressive Collapse Resistance of Emulative Precast Concrete Frames with Various Reinforcing Details . | JOURNAL OF STRUCTURAL ENGINEERING , 2021 , 147 (8) .
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Post-punching mechanisms of slab-column joints under upward and downward punching actions SCIE
期刊论文 | 2021 , 73 (6) , 302-314 | MAGAZINE OF CONCRETE RESEARCH
WoS核心集被引次数: 20
摘要&关键词 引用

摘要 :

Progressive collapse of reinforced concrete flat plate systems can be significantly influenced by the post-punching performance of their slab-column joints under large deformations. This work presents a series of static collapse tests on four flat slab-column joint specimens with slab in-plane restraint. The effects of different punching directions (upward and downward) and embedded beams on the post-punching performance of the joints were studied. The test results reveal that the post-punching load-bearing and deformation capacities are mainly governed by the longitudinal through-column reinforcement in the slab. The peak bearing capacities and failure modes of specimens without embedded beams were significantly influenced by different punching directions. Conversely, the post-punching mechanisms of specimens with embedded beams were identical regardless of their opposite punching shear actions. In addition, the inclusion of the embedded beams increased the resistance capacity of the specimens under both flexural and suspension mechanisms and enhanced the deformation capacity under the suspension mechanism. Furthermore, a finite-element numerical model was developed and verified against the test results. Based on the numerical study, the contributions of the concrete and reinforcement in resisting the collapse of the slab-column joints were evaluated.

关键词 :

finite element methods finite element methods slabs & plates slabs & plates testing, structural elements testing, structural elements

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GB/T 7714 Diao, Mengzhu , Li, Yi , Guan, Hong et al. Post-punching mechanisms of slab-column joints under upward and downward punching actions [J]. | MAGAZINE OF CONCRETE RESEARCH , 2021 , 73 (6) : 302-314 .
MLA Diao, Mengzhu et al. "Post-punching mechanisms of slab-column joints under upward and downward punching actions" . | MAGAZINE OF CONCRETE RESEARCH 73 . 6 (2021) : 302-314 .
APA Diao, Mengzhu , Li, Yi , Guan, Hong , Lu, Xinzheng , Xue, Huizhong , Hao, Zongda . Post-punching mechanisms of slab-column joints under upward and downward punching actions . | MAGAZINE OF CONCRETE RESEARCH , 2021 , 73 (6) , 302-314 .
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Regulation of hydrophobicity and water adsorption of MIL-101(Cr) through post-synthetic modification SCIE
期刊论文 | 2021 , 130 | INORGANIC CHEMISTRY COMMUNICATIONS
WoS核心集被引次数: 20
摘要&关键词 引用

摘要 :

Hydrophobic property of metal-organic frameworks (MOFs) is not only important for their stability improvement but also has a profound effect on the performance of many applications. The essence of coordination bonds led to most of the MOFs are hydrophilic and hydrophobic MOFs are generally achieved by hydrophobic modification of pore surface. Here, we report the systematic regulation of water adsorption and hydrophobic property of a classical MOF MIL-101(Cr) through post-synthetic modification. The contact angle (CA) of modified MIL-101 could vary from 17.9 degrees to 146.5 degrees by changing the alkyl chain length of primary amines. The water adsorption capacity and step pressure can also be tuned correspondingly.

关键词 :

Water adsorption Water adsorption Post-synthetic modification Post-synthetic modification Metal-organic framework Metal-organic framework MIL-101(Cr) MIL-101(Cr) Hydrophobic Hydrophobic

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GB/T 7714 Li, Yi , Wang, Hao-Tian , Zhao, Yan-Long et al. Regulation of hydrophobicity and water adsorption of MIL-101(Cr) through post-synthetic modification [J]. | INORGANIC CHEMISTRY COMMUNICATIONS , 2021 , 130 .
MLA Li, Yi et al. "Regulation of hydrophobicity and water adsorption of MIL-101(Cr) through post-synthetic modification" . | INORGANIC CHEMISTRY COMMUNICATIONS 130 (2021) .
APA Li, Yi , Wang, Hao-Tian , Zhao, Yan-Long , Lv, Jie , Zhang, Xin , Chen, Qiang et al. Regulation of hydrophobicity and water adsorption of MIL-101(Cr) through post-synthetic modification . | INORGANIC CHEMISTRY COMMUNICATIONS , 2021 , 130 .
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Pre- and post-punching performances of eccentrically loaded slab-column joints with in-plane restraints SCIE
期刊论文 | 2021 , 248 | ENGINEERING STRUCTURES
WoS核心集被引次数: 10
摘要&关键词 引用

摘要 :

In flat plate structures, interior slab-column joints are subjected to in-plane restraints and bending-shear actions, which can significantly impact their mechanical performance to resist progressive collapse. However, research in this area is still lacking. This paper presents experimental and numerical studies of pre-and post-punching performances of eccentrically loaded slab-column joints with in-plane restraints. Quasi-static tests were conducted on seven joint specimens, including one concentrically loaded (CL) joint and six eccentrically loaded (EL) ones. The effects of critical structural parameters (i.e., eccentricity, slab thickness and reinforcement ratio) on the pre-and post-punching performances were investigated by analysing the load-displacement relationships, failure modes and material strains. The experimental results indicated that larger eccentricity could lead to more reduction of the peak punching shear capacity by as much as 62%, whereas it has little effect on the post punching capacity. In addition, the strain results of the through-column rebars showed that, with the well restrained boundary conditions, the slab flexural reinforcement (FR) was found to resist the applied load to a large extent at small deformations and still able to contribute greatly during the post-punching stage. Numerical analysis was conducted to gain an in-depth understanding toward the effects of varied levels of in-plane restraints on both slab-column joints and actual flat plate structures. It was found that the lateral stiffnesses in the CL joint model with boundary beams and the substructure model were similar, which was around 400 N/mm. Finally, the interactions between the unbalanced moment and shear force were explored and compared with code predictions (ACI318-19 and EC2-04). Without considering the enhancement effects from in-plane restraints, the codes produced over-conservative predictions. Based on the FE analyses, the correlation between the dimensionless ratio e/d (eccentricity/effective thickness of slab) and punching shear strength was simplified by a combined straight line and a power curve.

关键词 :

Slab-column joint Slab-column joint Progressive collapse Progressive collapse Eccentric loading Eccentric loading In-plane restraint In-plane restraint Pre-and post-punching performances Pre-and post-punching performances

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GB/T 7714 Diao, Mengzhu , Li, Yi , Guan, Hong et al. Pre- and post-punching performances of eccentrically loaded slab-column joints with in-plane restraints [J]. | ENGINEERING STRUCTURES , 2021 , 248 .
MLA Diao, Mengzhu et al. "Pre- and post-punching performances of eccentrically loaded slab-column joints with in-plane restraints" . | ENGINEERING STRUCTURES 248 (2021) .
APA Diao, Mengzhu , Li, Yi , Guan, Hong , Yang, Zhi , Gilbert, Benoit P. , Wang, Junkun . Pre- and post-punching performances of eccentrically loaded slab-column joints with in-plane restraints . | ENGINEERING STRUCTURES , 2021 , 248 .
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Enhancing post-punching performance of flat plate-column joints by different reinforcement configurations SCIE
期刊论文 | 2021 , 43 | JOURNAL OF BUILDING ENGINEERING
WoS核心集被引次数: 18
摘要&关键词 引用

摘要 :

To enhance post-punching strengths and deformation capacities of flat plate-column joints for mitigating progressive collapse, two strengthening methods including stirrups and embedded ring beams within the joint regions were proposed. An experimental test program on six flat plate-column joint specimens with in-plane constraints was conducted under the modes of upward punching shear failure (UPS mode) and downward punching shear failure (DPS mode). The specimens included two conventional specimens without strengthening (UPS/DPS), two specimens with stirrups (two-legged closed ties, UPS-S/DPS-S) and two specimens with ring beams (UPS-R/DPS-R). The test results showed that, in comparison to UPS/DPS, the average post-punching displacements in UPS-S/DPS-S and UPS-R/DPS-R were increased by 25% and 32%, respectively, along with 64% and 50% enhancement in the corresponding post-punching shear strengths. Numerical simulations were also performed to analyze the effects of different stirrup and ring beam configurations on the post-punching strengths and deformation capacities. Numerical results suggested that double stirrups (four-legged closed ties) installed surrounding the column stub could lessen joint damage and further improve punching shear and post-punching strengths by 15% and 9%, respectively, comparing to UPS-S/DPS-S. For ring beam specimens, under DPS mode, the first punching shear failure inside the ring beams can be prevented by their inner edges directly connected to the column. The post-punching deformations and strengths of this specimen were increased by at least 10%, comparing to DPS-R. Numerical simulation of UPS-R further showed that the strengthening effect also depends on the constraints provided by the concrete.

关键词 :

Stirrups Stirrups Embedded ring beams Embedded ring beams Post-punching performance Post-punching performance Flat plate-column joints Flat plate-column joints Reinforcement strengthening configuration Reinforcement strengthening configuration

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GB/T 7714 Yang, Youzhe , Li, Yi , Guan, Hong et al. Enhancing post-punching performance of flat plate-column joints by different reinforcement configurations [J]. | JOURNAL OF BUILDING ENGINEERING , 2021 , 43 .
MLA Yang, Youzhe et al. "Enhancing post-punching performance of flat plate-column joints by different reinforcement configurations" . | JOURNAL OF BUILDING ENGINEERING 43 (2021) .
APA Yang, Youzhe , Li, Yi , Guan, Hong , Diao, Mengzhu , Lu, Xinzheng . Enhancing post-punching performance of flat plate-column joints by different reinforcement configurations . | JOURNAL OF BUILDING ENGINEERING , 2021 , 43 .
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Multiple-Input Convolutional Neural Network Model for Large-Scale Seismic Damage Assessment of Reinforced Concrete Frame Buildings SCIE
期刊论文 | 2021 , 11 (17) | APPLIED SCIENCES-BASEL
WoS核心集被引次数: 18
摘要&关键词 引用

摘要 :

This study introduces a multiple-input convolutional neural network (MI-CNN) model for the seismic damage assessment of regional buildings. First, ground motion sequences together with building attribute data are adopted as inputs of the proposed MI-CNN model. Second, the prediction accuracy of MI-CNN model is discussed comprehensively for different scenarios. The overall prediction accuracy is 79.7%, and the prediction accuracies for all scenarios are above 77%, indicating a good prediction performance of the proposed method. The computation efficiency of the proposed method is 340 times faster than that of the nonlinear multi-degree-of-freedom shear model using time history analysis. Third, a case study is conducted for reinforced concrete (RC) frame buildings in Shenzhen city, and two seismic scenarios (i.e., M6.5 and M7.5) are studied for the area. The simulation results of the area indicate a good agreement between the MI-CNN model and the benchmark model. The outcomes of this study are expected to provide a useful reference for timely emergency response and disaster relief after earthquakes.

关键词 :

multiple-input convolutional neural network multiple-input convolutional neural network machine learning machine learning seismic damage assessment seismic damage assessment nonlinear time history analysis nonlinear time history analysis seismic response seismic response

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GB/T 7714 Xiong, Chen , Zheng, Jie , Xu, Liangjin et al. Multiple-Input Convolutional Neural Network Model for Large-Scale Seismic Damage Assessment of Reinforced Concrete Frame Buildings [J]. | APPLIED SCIENCES-BASEL , 2021 , 11 (17) .
MLA Xiong, Chen et al. "Multiple-Input Convolutional Neural Network Model for Large-Scale Seismic Damage Assessment of Reinforced Concrete Frame Buildings" . | APPLIED SCIENCES-BASEL 11 . 17 (2021) .
APA Xiong, Chen , Zheng, Jie , Xu, Liangjin , Cen, Chengyu , Zheng, Ruihao , Li, Yi . Multiple-Input Convolutional Neural Network Model for Large-Scale Seismic Damage Assessment of Reinforced Concrete Frame Buildings . | APPLIED SCIENCES-BASEL , 2021 , 11 (17) .
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Numerical Modelling of the Progressive Collapse of Reinforced Concrete Frames with Different Lateral Restraints CPCI-S
会议论文 | 2020 , 37 , 755-763 | 25th Australasian Conference on the Mechanics of Structures and Materials (ACMSM)
摘要&关键词 引用

摘要 :

This paper presents a fibre-beam-element based model to capture the progressive collapsemechanisms of reinforced concrete (RC) frames. The model is comprised of rectangular and T-section fibre-beam elements. A stress-strain relationship for the steel which considers the embedment of the reinforcing bars in the concrete, the effect of concrete confinement and the bond-slip between the concrete and reinforcements are also considered in the model. The accuracy of the model is verified against experimental tests performed on two asymmetric one-story beam-column specimens with flange slabs under different lateral restraints. The first specimen, referred to as "OP", was a two-bay frame subjected to a penultimate column removal scenario, while the other one, referred to as "OA", was a three-bay frame with an antepenult removal scenario. The simulation results agree well with the experimental results with prediction of the peak capacity being within 10%. The model is then used to gain an in-depth understanding of the failure mechanisms of the two tested specimens. Numerical results reveal that the progressive collapse resistance of the RC frames is primarily determined by the bending stiffness and capacity of the columns. Compared to OP, the extra bay in OA provided a larger horizontal restraint to the damaged beam-flange slab, leading to 115% and 650% larger axial forces at the peak resistances under the stages of compressive arch action (CAA) and catenary action (CA), respectively. Furthermore, the penultimate column in OA was found to damage prior to its edge column, owing to its close proximity to the missing column and the additional bending moment MF generated by the redistributed axial forces to the columns.

关键词 :

Numerical simulation Numerical simulation Penultimate and antepenult column removal scenarios Penultimate and antepenult column removal scenarios Progressive collapse Progressive collapse Reinforced concrete Reinforced concrete

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GB/T 7714 Diao, M. Z. , Li, Y. , Guan, H. et al. Numerical Modelling of the Progressive Collapse of Reinforced Concrete Frames with Different Lateral Restraints [C] . 2020 : 755-763 .
MLA Diao, M. Z. et al. "Numerical Modelling of the Progressive Collapse of Reinforced Concrete Frames with Different Lateral Restraints" . (2020) : 755-763 .
APA Diao, M. Z. , Li, Y. , Guan, H. , Lu, X. Z. , Gilbert, B. P. . Numerical Modelling of the Progressive Collapse of Reinforced Concrete Frames with Different Lateral Restraints . (2020) : 755-763 .
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