铁道科学与工程学报Issue(1)：127-131,5.
预应力混凝土箱梁桥开裂后的残余承载力分析
Analysis of residual bearing capacity of cracked prestressed concrete continuous box bridges
摘要
Abstract
Based on the crack statistic characteristic parameters,the unit degradation mode was utilized to simu-late the fracture of prestressed concrete box bridges and analyze its residual bearing capacity.In the meantime, unidirectional compressive rod,space beam element and cooling unit form were adopted to simulate the effects of pressure among cracks,prestressed tendons and the pre -tension effect,in order to form a space rigid frame model.Based on some basic assumptions of cracked concrete and prestressed steel,the calculation method was established after cracking.Merging similar cracks by the principle of similar height,reduction of cracking area and reduction gravity compensation,the ladder -type stiffness degradation model of crack area was then estab-lished and a capacity reduction calculation method was proposed to reflect the change of the crack stiffness.The real bridge example proves that the method can correctly judge the change of bearing capacity for cracked static determinacy and indeterminacy concrete structures.关键词
预应力混凝土桥梁/开裂/残余承载能力/刚度Key words
prestressed concrete bridge/crack/residual bearing capacity/stiffness分类
交通工程引用本文复制引用
王凌波,赵煜..预应力混凝土箱梁桥开裂后的残余承载力分析[J].铁道科学与工程学报,2015,(1):127-131,5.基金项目
国家自然科学基金资助项目（50908017）；中央高校基本科研业务专项基金资助项目 （）
