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Seismic performance of concrete columns confined by high‑strength stirrups

Hou Chongchi, Zheng Wenzhong, Liu Pengfei, Wang Qinghe, Qi ShaoBo

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 2

art. no. e69, 2023

The concrete columns confined by high-strength stirrups exhibited higher bearing capacity and better deformation ability. Based on the test results of concrete columns confined by high-strength stirrups under lateral cyclic loading, it is found that stirrup yield strength could not be used directly in calculating bearing capacity, because the high-strength stirrup could not yield at the peak point. Moreover, according to the seismic performance of a total of 49 sets of confined concrete columns from this paper and other 5 research papers, an easy-to-use model of skeleton curve is proposed by using a set of empirical equations to calculate the characteristic points of skeleton curve. Furthermore, based on the proposed model of skeleton curve, hysteretic rules are developed for the unloading and reloading stages by providing calculating formula of unloading stiffness and ignoring the effect of strength degradation. Finally, the proposed model of skeleton curve and hysteretic rules are verified and evaluated by comparing the calculated curves and experimental curves.

Study on the restoring force model for the high‑speed railway CRTS III Slab Ballastless Track

Liu Lili, Jiang Lizhong, Zhou Wangbao, Yu Jian, Peng Kang, Zuo Yongjian

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 3

art. no. e148

The China Railway Track System III (CRTS III) Slab Ballastless Track (SBT) is currently one of China's most widely used track structures. The elastic-plastic restoring force hysteresis model of CRTS III SBT is the primary problem that should be solved for the elastic-plastic seismic response analysis of high-speed railway (HSR) CRTS III SBT systems. To study the elastic-plastic restoring force hysteretic model of CRTS III SBT, four CRTS III SBT specimens were designed in this study and subjected to low-cycle reciprocating load tests. The efects of different thickness of rubber pad on the hysteretic curve, skeleton curve, and other performance of CRTS III SBT specimens were determined. In addition, the restoring force characteristics and hysteretic trends of CRTS III SBT specimens were ascertained. Furthermore, a load-displacement restoring force model for CRTS III SBT was built. Its results were compared with the test results, thus validating the load-displacement restoring force model rationality. The load-displacement restoring force model developed in this study is simple to calculate, laying a solid foundation for analyzing the elastic-plastic seismic responses of HSR CRTS III SBT systems.