EXPERIMENTAL STUDIES ON SEISMIC PERFORMANCE OF SUBSIDIARY PIERS OF LONG-SPAN CABLE-STAYED BRIDGE WITH ENERGY DISSIPATION
Several sea-crossing projects consisting of long span bridges with low natural frequencies are under planning,which may respond with large deformation and suffer from damage under strong earthquakes.In order to protect long span cable-stayed bridges from collapse,a new damage-controlled structure of 60m high sacrificial subsidiary piers was proposed and the required capacity of the piers was redesigned based on the simulation results of a trail designed cable-stayed bridge with a main span of 1400m.Then,three corresponding 1/10-scaled subsidiary pier models,which were one single RC column and two twin RC columns connected by energy dissipating elements,were tested under cyclic quasi-static loads.Model 1 is a single column pier.Model 2 has two columns connected by low-yielding shear-typesteel links which are built-up wide-flange sections with shear deformable regions at the center and the connection regions on both ends.Model 3 also has two columns connected by buckling restrained braces which consist of steel core incased in a steel tube filled with concrete and were designed to yield in axial force as a series of energy dissipation members between the twin columns.The experimental results show that,compared with a single column (Model 1),the energy dissipation members in Models 2 and 3 are effective on seismic performance of subsidiary piers,so it can be expected that the damage to the cable-stayed bridge tower can be reduced by the subsidiary piers under strong earthquake.
Damage-controlled RC subsidiary piers energy dissipation shear links buckling restrained braces
Limin Sun Jun Wei Wen Xie
State Key Laboratory in Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, P.R.China
国际会议
The Twelfth International Symposium on Structural Engineering (第十二届结构工程国际研讨会)
武汉
英文
1110-1115
2012-11-17（万方平台首次上网日期，不代表论文的发表时间）