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Author:

Gao, Xiangyu (Gao, Xiangyu.) | Li, Jianqin (Li, Jianqin.) | Liu, Chao (Liu, Chao.) (Scholars:刘超) | Li, Yanglong (Li, Yanglong.)

Indexed by:

EI PKU CSCD

Abstract:

With shaking table tests of steel braced concrete frames, an issue of suddenly increasing torsion duo to steel brace buckling or other elements damage, i. e. inelastic torsion, is studied. Test results indicate that steel brace buckling or failure would be the main cause of the inelastic torsion in this kind of buildings. Based on the test results, the mechanism of the suddenly increasing inelastic torsion is studied, some FEM models of calculation examples with preseting occasional eccentricity are established, and nonlinear analysis are conducted. With the analytical models, the sudden increasing torsion issue is verified still existed while the number of elements in symmetric structure is increased but the brace number remains unchanged. It is cleared that even if it is a symmetrical structure, both routings of brace buckling or its re-straightening will induce the inelastic torsion and its sudden increase. Although there are inelastic torsion in pure concrete frames, but it perform a smaller torsional amplitude increment than steel braced one under same loading and eccentricity conditions, and not only tests but also analytical models reveal the similar phenomenon. With installed buckling-restrained braces(BRB)in concrete frames, it has been proved significantly effective to resist nonlinear torsion, superior to steel braced concrete frame or pure concrete frame. There are suggestions to structural engineers as follows: installing BRB is suggested to effectively minimize and control the inelastic torsion of concrete frames, it is recommended that a non-linear FEM analysis with preset occasional floor mass eccentricity to get inelastic torsion under strong earthquakes, and the maximum torsional response should be limited to a reasonable value in seismic design stage. © 2018, Editorial Office of Journal of Building Structures. All right reserved.

Keyword:

Concrete testing Concretes Analytical models Seismic design Nonlinear analysis Buckling Earthquakes Steel testing Torsional stress

Author Community:

  • [ 1 ] [Gao, Xiangyu]Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education, Beijing University of Technology, Beijing; 100124, China
  • [ 2 ] [Li, Jianqin]Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education, Beijing University of Technology, Beijing; 100124, China
  • [ 3 ] [Li, Jianqin]State Power Economic Research Institute, State Grid, Beijing; 102209, China
  • [ 4 ] [Liu, Chao]Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education, Beijing University of Technology, Beijing; 100124, China
  • [ 5 ] [Liu, Chao]Beijing Electric Power Engineering Company, Beijing; 100070, China
  • [ 6 ] [Li, Yanglong]Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education, Beijing University of Technology, Beijing; 100124, China

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Source :

Journal of Building Structures

ISSN: 1000-6869

Year: 2018

Issue: 2

Volume: 39

Page: 44-53

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 5

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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