有效预应力对大跨P.C.桥梁极限承载力的影响研究  

Influence of effective prestress on ultimate bearing capacity for large-span prestressed concrete bridge

作　　者：吴光宇[1] 林伟[1] 汪劲丰[2] 贾益纲[1] 项贻强 

机构地区：[1]南昌大学建筑工程学院,南昌330031 [2]浙江大学建筑工程学院,杭州310027

出　　处：《计算力学学报》2013年第3期362-369,共8页Chinese Journal of Computational Mechanics

基　　金：浙江省自然科学基金(Y1110181);国家自然科学基金(51268044;50968012;51108411)资助项目

摘　　要：采用三维实体退化虚拟层合单元理论探讨了有效预应力对大跨P.C.桥梁极限承载力的影响。针对不同的有效预应力水平,以一座典型的预应力混凝土连续刚构桥为例,采用三维精细化有限元模型,对其极限承载力进行了空间分析计算和讨论。分析表明,有效预应力对大跨P.C.桥梁极限承载力有较大影响,其中,纵向预应力筋有效预应力与竖向预应力筋有效预应力的比例是影响桥梁极限承载力的重要参数。大跨P.C.桥梁结构设计时应充分重视这一问题。Based on degenerated three-dimension solid virtual laminated element theory, the influence of effective prestress on ultimate bearing capacity for large-span prestressed concrete bridge is explored. According to various level of effective prestress,the ultimate bearing capacity for a classical prestressed concrete continuous rigid frame bridge is spatial analyzed and discussed by three-dimension detailed finite element model. Analysis results show the influence of effective prestress on ultimate bearing capacity for large-span prestressed concrete bridge is great. Among them,the ratio of the effective prestress of longi- tudinal prestressing reinforcement and vertical prestressing reinforcement is the important factor that affect the ultimate bearing capacity of bridge. The structure design of large-span prestressed concrete bridge should think highly of the influence.

关 键 词：大跨预应力混凝土桥梁 有效预应力 极限承载力 

分 类 号：U441[建筑科学—桥梁与隧道工程] U448.35[交通运输工程—道路与铁道工程]