单因素耐久性退化后预应力混凝土简支梁桥的承载力分析  

Single-factor Analysis on Capacity of PC Simply Supported Beam Bridge after Durability Degradation

作　　者：任重昕[1] 于晓坤[1] 苏义坤[1] 白浪[2] 

机构地区：[1] 东北林业大学,哈尔滨150040 [2] 哈尔滨工业大学

出　　处：《东北林业大学学报》2014年第8期109-111,共3页Journal of Northeast Forestry University

基　　金：“十二五”国家科技支撑项目(2012BAJ19B00)

摘　　要：从影响预应力混凝土简支梁桥耐久性能的因素中,选取3个因素(初始预应力、室温循环下混凝土强度、冻融循环下混凝土强度),运用有限元单元法对预应力混凝土简支梁桥的承载力进行分析。结果表明:初始预应力越大,简支梁的挠度也就越大;钢绞线的有效预应力越大,挠度的变化最大值越小。在室温环境下,随着使用时间的递增,简支梁梁底跨中混凝土应变呈现先减小后增大的趋势。在冻融循环下,随着荷载的增大,同一冻融循环作用下的跨中梁底混凝土的应变逐渐减小,混凝土的应变值随着冻融次数的增加而变大。We chose three key factors （ initial pre-stress, strength of concrete at the room temperature and freeze-thaw cycles ） affecting the durability of concrete to analyze the capacity of prestressed concrete simply supported beam bridge by the fi -nite element methods .The deflection of simply supported beam has the same variation with the initial pre-stress, and the effective prestress of strand has the opposite change with the max value of deflection .At the room temperature , the strain of concrete at the mid-span of the bridge decreases first , and then increases .In the freeze-thaw cycles, with increasing of the load, the strain decreases gradually .The strain increases with number increase of freeze-thaw cycles.

关 键 词：预应力混凝土 简支梁桥 结构承载力 单因素分析 

分 类 号：U446[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]