An out-of-plane bending hysteretic model for multi-planar CHS X-connections. (February 2020)

• Record Type: Journal Article
• Authors: Zhao, Bida; Sun, Chao; Cai, Yangzheng; Liu, Chengqing
• Is Part Of: Structures. Volume 23(2020)
• Page Start: 335
• Page End: 350
• Publication Date: 2020-02
• Subjects: Multi-planar CHS X-connections -- Out-of-plane bending hysteretic model -- Skeleton curve -- Restoring force curve -- Seismic performance -- Influence of brace axial stress and chord stress; Structural engineering -- Periodicals; 624.1
• DOI: 10.1016/j.istruc.2019.10.003
• Languages: English
• ISSNs: 2352-0124

Abstract

Abstract: The multi-planar circular hollow section (CHS) X-connection is one of common configurations in single layered lattice steel tubular structures. A hysteretic model, including the skeleton model and restoring force model is proposed to simulate the hysteretic performance of X-connections under cyclic out-of-plane bending moments (OPB) generated by vertical seismic action. Exponential function is adopted in the skeleton model and the Ramberg-Osgood function is adopted in the restoring force model. The parameters in the hysteretic model are determined by finite element (FE) analysis and nonlinear regression. Additionally, an improved out-of-plane bending hysteretic model considering the influence of brace axial stress and chord normal stress is developed to simulate the seismic performance of X-connections in engineering practice. The proposed hysteric model is verified by experimental and FE results and the improved hysteretic model can consider the effect of strength degradation.