摘要
目的探析竖向偏心受压部分填充混凝土圆形钢桥墩柱在横桥方向往复荷载作用下的抗震性能.方法以城市高架桥倒L型桥墩为研究对象,利用有限元分析软件ABAQUS建立了该类钢桥墩的有限元分析简化模型,根据计算得出的力与位移(H-δ)滞回曲线结果,对其在竖向偏心荷载及横桥方向往复荷载作用下的柱两侧水平承载力及无偏心和偏心桥墩柱之间的承载力关系进行了研究.钢桥墩柱的长细比参数取0.2、0.3和0.4,钢管部分截面径厚比参数取0.07、0.08和0.09,竖向荷载的偏心率e则取0、0.1、0.15和0.2.结果部分填充混凝土钢桥墩在偏心一侧的水平承载力降低,相反在另一侧的水平承载力则得到增强,呈明显的不对称性,且随着偏心率的增加,抗震性能降低.拟合得出一个关于无偏心受压钢桥墩柱与偏心受压钢桥墩柱之间H-δ滞回曲线关系的经验公式.结论经验公式计算得出的骨架曲线和滞回曲线与有限元分析直接得到的骨架曲线和滞回曲线结果无论在弹性阶段还是在塑性阶段吻合性均较好,经验公式的有效性得到验证,该公式将为偏心受压部分填充混凝土圆形钢桥墩横桥方向的抗震性能设计提供理论依据.
The seismic performance of eccentrically loaded partial concrete-filled steel tubular bridge piers was studied under the cyclic load of transverse direction. The inverted-L bridge pier ofurban viaduct was taken as the research object in this paper. The simplified FEA model of steel tubular bridge pier was established by using ABAQUS software to calculate the H- δ hysteretic curves. The horizontal bearing capacity of both sides of the columns and bearing capacity relationship about non-eccentric and eccentric bridge piers were studied under eccentrically vertical load and cyclic load. The slenderness ratio of models was taken as 0. 2,0. 3 and 0. 4,the radius-thickness ratio was taken as 0. 07,0. 08 and 0. 09,and the eccentricity of vertical load was taken as 0,0. 1,0. 15 and 0. 2. Based on the force-displacement hysteretic curves,the horizontal bearing capacity on the eccentricside is reduced and that on the other side is greater. The hysteretic curve is obviously asymmetric. The seismic performance of bridge pier decreases with the increase of eccentricity. Compared the H- δ hysteretic curves of non-eccentric partial concrete-filled steel tubular bridge piers with the eccentric ones,a empirical formula was proposed to describe the H- δ hysteretic curve relationship about non-eccentric and eccentric partial concrete-filled steel tubular bridge piers. The hysteretic curve and skeleton curve which is calculated by the empirical formula showgood agreement with the results by FEA both in the elastic and plastic range,which verified the validity of the empirical formula. So the formula will provide the theory basis for transverse direction seismic performance design of eccentrically vertical loaded partial concrete-filled steel tubular bridge piers.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2016年第2期261-270,共10页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51178275)
辽宁省自然科学基金项目(2013020149)
辽宁省高等学校杰出青年学者成长计划项目(LJQ2014060)
关键词
部分填充混凝土
钢桥墩柱
偏心率
抗震性能
partial filled concrete
steel tubular bridge piers
eccentricity
seismic performance
