第五章-高速铁路圆端形空心桥墩抗震性能试验研究.pdfVIP

31 3 Vol.31 No.3 2014 3 Mar. 2014 ENGINEERING MECHANICS 72 1000-4750(2014)03-0072-11 1,2 1 1 1 (1. 410075 2. 410075) 10 U24; U442.5+5 A doi: 10.6052/j.issn.1000-4750.2013.01.0111 EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF HOLLOW PIERS WITH ROUNDED RECTANGULAR CROSS SECTION IN HIGH-SPEED RAILWAYS 1,2 1 1 1 JIANG Li-zhong , SHAO Guang-qiang , WANG Hui , JIANG Jing-jing (1. School of Civil Engineering, Central South University, Changsha 410075, China; 2. National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China) Abstract: Ten large-scale specimens were designed based on hollow pier prototypes with rounded rectangular cross section used in high-speed railways. Hysteresis curves and failure mechanisms were obtained from cyclic loading tests under constant axial loading. The influence of each design parameter on the energy dissipation capacity and ductility of the specimens was further analyzed, and the shear performance of piers was evaluated using two empirical seismic shear capacity equations. Test results show that all specimens failed in flexure with flexure-shear cracks commonly observed at the bottom of the piers. The hysteresis curves had significant pinch and the skeleton curves rose slowly from concrete cracking to yielding. The displacement ductility reduced and the bearing strength increased with the increment in axial-load ratio and longitudinal reinforcement ratio. No pronounced effects of the volume-stirrup ratio on the ductility were observed due