体外预应力对钢箱-混凝土组合连续梁桥受弯性能的影响分析  

Analysis of External Prestressing Effect on Flexural Performance of Composite Steel Box-concrete Continuous Girder Bridge

作　　者：张南[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009

出　　处：《公路交通科技》2007年第8期57-62,共6页Journal of Highway and Transportation Research and Development

基　　金：江苏省普通高校自然科学研究计划资助项目(02KJB560001)

摘　　要：应用空间有限元方法,对3跨变截面预应力钢箱-混凝土组合连续梁桥进行了建造全过程分析。着重研究了施加体外预应力对钢箱-混凝土组合连续梁桥受弯性能的影响,采用单元生成技术实现钢箱-混凝土组合连续梁桥受力全过程模拟。分析结果表明,当钢箱-混凝土组合连续梁桥跨度较大,且截面尺寸受限时,采用常规的墩顶强迫位移、桥面板施加体内预应力等措施仍不能满足中支座负弯矩区域的承载力要求。对中支座负弯矩区域桥面板施加局部体外预应力,对于改善钢箱-混凝土组合连续梁桥的受弯性能有较大的作用,能提高钢箱-混凝土组合桥梁的承载力,进而提高了跨越能力,具有更好的综合经济效益。The total construction process of three-span composite steel box-concrete continuous girder bridge having varied cross-section is analyzed by using spatial finite element method. The external prestressing effect on flexural perfonnance of composite steel box-concrete continuous girder bridge is emphatically studied. The element creation technique is adopted to simulate the total flexural process of composite steel box-concrete continuous girder bridge. The analysis results show that when the main span of composite steel box-concrete continuous girder bridge is longer and its cross-section size is limited, the strength requirement of negative moment region at middle support can not be satisfied by using the conventional measures such as forced top-pier displacement, internal prestressing on bridge deck, etc. The local external prestressing on the bridge deck of the negative moment region at middle support has greater effect on improving the flexural performance of composite steel box-concrete continuous girder bridge. The load carrying capacity and spanning ability of composite steel box-concrete continuous girder bridge can be increased, which will bring greater integrated economic benefits.

关 键 词：桥梁工程 钢箱-混凝土组合连续梁桥 空间有限元分析 受弯性能 体外预应力 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]