摘要
采用实体有限元方法分析预制拼装钢管约束混凝土桥墩在循环荷载作用下的力学反应,介绍了实体有限元方法分析预制拼装桥墩的关键技术.有限元计算得到的变形和破坏形态与试验结果基本一致,荷载位移滞回曲线也与试验结果吻合良好.在此基础上进行的参数分析结果表明:随预应力筋产生的轴压力增加,构件强度增加但延性降低;套筒约束程度对节段拼装摇摆单柱墩的滞回性能基本没有影响;接缝区域混凝土强度越高,侧向抗力增加.
Nonlinear 3-D finite element（FE）model of post-tensioned precast concrete-filled tube segmental bridge column with unbonded strands under cyclic loading is established and the key aspects of the modeling technic are given. Deformed shape, crack distribution and hysteresis loop from FE model under low-reversed cyclic loading are in conformity with those of the cyclic loading test. The results of paramatic analysis show that with the increase in axial force produced by the prestressing tendons, bearing capacity increases while ductility decreases; the confining level of bottom segment has little influence on the cyclic behavior of the segmental bridge column; and with the increase in strength of concrete in the joints, bearing capacity increases.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第7期894-899,共6页
Journal of Tongji University:Natural Science
基金
国家自然科学基金资助项目(50508032)
关键词
预制拼装桥墩
无粘结预应力筋
钢管混凝土
非线性有限元分析
滞回性能
precast segmental bridge column
unbonded strands
concrete filled tube
nonlinear finite element analysis
hysteresis performance
