混合配筋管桩低周往复试验研究

EXPERIMENTAL RESEARCH ON HYBRID REINFORCED CONCRETE PIPE PILE UNDER QUASI-STATIC LOAD

对普通管桩（PHC）和混合配筋的管桩（PRC）进行低周往复试验,并使用弹簧来模拟桩周土作用。通过试验分析构件的破坏形态和受力性能,结果表明：PRC管桩裂缝分布更均匀,增加非预应力钢筋能改善PHC管桩脆性断裂的不足,而非预应力钢筋配筋率过大也会造成混凝土过早压碎,非预应力钢筋和预应力钢筋的配筋强度比在0.4~0.8之间最合适。

The Prestress High Concrete（ PHC） pipe pile and Prestressed Reinforced Concrete（ PRC） pipe pile were tested under quasi-static load,and the spring was used to simulate the pile-soil interaction. Through the test analysis of failure modes and mechanical properties,the results showed that the PRC pipe crack distribution was more uniform,the non-prestressed reinforcement could improve the brittle fracture of PHC pipe pile. However,it might lead to premature crushing of concrete if the non-prestressed reinforcement ratio was too large,the most appropriate strength ratio of non prestressed steel reinforcement versus prestressed steel reinforcement was 0. 4 ~ 0. 8.