偏心受压部分填充混凝土圆形钢桥墩横桥方向作用下拟静力试验

摘要

Study on mechanical performance of the partial concrete-filled steel bridge piers under vertical eccentric loading and horizontal cyclic loading.An experimental study on the four partial concrete-filled steel tubular bridge piers was carried out.At the same the radius-thickness ratio and slenderness ratio,the eccentricity of vertical eccentric loading is 0.1 and 0.2.Analyze the test results of partial concrete-filled steel bridge piers under eccentric loading and horizontal cyclic loading.The mechanical properties of the specimen changed due to the existence of vertical eccentric loading.The influence of eccentricity on the bearing capacity of steel column is obvious.The initial horizontal displacement of the piers increases with the eccentricity greater.The bearing capacity in the eccentric side decreased by 7％ to 15％,the other side improve the 10％ to 18％ with the existence of eccentric loading.And the greater the eccentricity,the more obvious the phenomenon.The filled concrete has good reinforcing effect on ultimate strength and ductility performance of steel bridge pier column specimens;While the bearing capacity in the eccentric side gets lower,the other side goes into strengthen due to the vertical eccentric loading.%目的 研究偏心受压及横桥方向往复荷载作用下部分填充混凝土圆形钢桥墩的力学性能.方法 在径厚比、长细比等参数相同的条件下,竖向偏心荷载的偏心率为0.1和0.2时,对4个圆形截面部分填充混凝土钢桥墩试件进行试验.分析偏心受压及横桥向荷载作用下部分填充混凝土钢桥墩柱试件试验结果.结果 竖向偏心荷载的存在改变了试件的受力性能.当试件的径厚比、长细比参数相同时,偏心率对钢管柱的承载能力影响比较明显.偏心率越大,桥墩的初始水平位移也随着增加.而偏心荷载的存在使得试件在偏心侧的承载力降低了7％～15％,另一侧加强了10％ ～ 18％,且偏心率越大,该现象越明显.结论 内填混凝土对钢桥墩柱试件的承载力和延性性能有很好地补强效果;而竖向偏心荷载的存在使得试件在偏心侧的承载力降低,另一侧加强.