Spatial nonlinear simulation analysis of progressive collapse resistance of R.C. frame structure under different seismic precautionary

• Published in: Journal of intelligent & fuzzy systems Vol. 34; no. 2; pp. 1013 - 1024
• Main Authors: Yi-Gang, Jia, Huan, Li, Guang-Yu, Wu, Zhi-Jun, Yuan, Qing, Zhang
• Format: Journal Article
• Language: English
• Published: Amsterdam IOS Press BV 01.01.2018
• Subjects: Catastrophic collapse; Collaboration; Columns (structural); Computer simulation; Earthquake resistance; Failure analysis; Nonlinear analysis; Reinforced concrete; Space frames; Stiffness
• ISSN: 1064-1246; 1875-8967
• DOI: 10.3233/JIFS-169395

Based on the 3D virtual laminated element and considering the beam-slab-column collaboration, this paper conducts the nonlinear infinite laminated element analysis of three reinforced concrete (R. C.) space frame structural models with different seismic precautionary, respectively, after single-column failure and collapse calculation analysis and method verification of a two-bay and four-floor R. C. space frame. Analysis results show that: 1) with the increase of the seismic precautionary intensity, the space stiffness of the frame structure when collapsing as a whole increases, and the collapse mode transfers from the “slow changing” to the “abrupt changing;” 2) the higher the seismic precautionary intensity is, the stronger the vertical progressive collapse resistance capability of the structure is; 3) the floorslab membrane effect can delay the appearance of the beam’s catenary effect, but enhance the framed beam-to-floorslab membrane stress mechanism and the catenoid mechanism; the slab-framed beam collaboration can increase the vertical progressive collapse capability in the catenary (catenoid) period.