预制浅承插式高强混凝土空心桥墩抗震性能试验

为降低桥墩运输吊装质量、简化连接工艺、减小承台尺寸,提出了浅承插式(承插深度比为0.7)高强混凝土预制空心桥墩方案,并对其进行拟静力滞回试验研究.试验中共测试1个现浇墩、2个不同后灌注混凝土高度(350、850 mm)的预制空心墩,对比了 3个桥墩的变形和破坏过程,比较了不同后灌注混凝土高度的预制桥墩与现浇桥墩的滞回曲...

Seismic Performance of Precast Hollow High-strength Concrete Bridge Columns with Shallow Socket Connection

To reduce the precast column weight for easier transportation and erection, simplify the connection and minimize the footing size, the hollow concrete bridge column using high strength-concrete and a shallow socket connection with a depth-to-width ratio of 0.7 was proposed in this study. Two precast columns with different post-pouring height (350 mm and 850 mm) was experimentally investigated by unilateral cyclic loading test, and was compared with a cast-in-place (CIP) reference column. The damage process, load-displacement relationship, bending capacity, energy dissipation, displacement ductility, stiffness degradation, residual displacement, curvature profile, and strain response were analyzed from experimental results. The unilateral cyclic loading test results showed that the precast hollow high-strength concrete column with shallow socket connection exhibited emulative seismic performance of the CIP reference. The precast column with higher post-poured concrete (850 mm) shows a significant improvement in energy dissipation than the one with lower post-poured concrete (350 mm), whereas deeper post-poured concrete only slightly increases the carrying capacity.