大跨度连续箱梁桥非自平衡张弦梁结构加固方案研究

发布时间：2019-03-13 19:06

【摘要】：针对目前加固技术对改善大跨度连续箱梁桥承载能力有限等情况,引入非自平衡张弦梁结构(NSE-BSS),对大跨度连续箱梁桥非自平衡张弦梁结构(NSE-BSS)加固方案进行研究。NSE-BSS由上弦刚性受压构件、下弦拉索和撑杆组成,通过上弦刚性受压构件沿主梁底板下缘布置,使整个NSE-BSS加固于主梁下部。以重庆奉云高速公路孙家沟大桥为背景,采用有限元分析方法,考虑标准结构、超载、预应力损失影响因素,针对4种NSE-BSS结构设计方案,分析了最大效应荷载加载下不同撑杆布置和拉索张拉力下桥梁的承载能力。研究结果表明,NSE-BSS可以有效地提高大跨度连续箱梁桥的承载能力,且在超载、预应力损失影响因素下加固效果更明显,撑杆由竖撑和斜撑组合的张弦梁结构GH-XS和DG-XS方案加固效果更优。
[Abstract]:In order to improve the bearing capacity of long-span continuous box girder bridges, the non-self-balanced beam string structure (NSE-BSS) is introduced. The strengthening scheme of non-self-balanced tensioned string structure (NSE-BSS) for long-span continuous box girder bridge is studied. NSE-BSS is composed of upper chord rigid compression member, lower string tension cable and strut, and is arranged along the bottom edge of the main beam through the upper string rigid compression member. The whole NSE-BSS is strengthened at the lower part of the main beam. Under the background of Sunjiagou Bridge of Fengyun Expressway in Chongqing, four kinds of NSE-BSS structural design schemes are designed by using finite element analysis method, considering standard structure, overloading and influence factors of prestress loss. The bearing capacity of the bridge under different strut arrangement and tensile force under maximum effect load is analyzed. The results show that NSE-BSS can effectively improve the bearing capacity of long-span continuous box girder bridges, and the reinforcement effect is more obvious under the influence factors of overloading and loss of prestress. The reinforcement effect of GH-XS and DG-XS scheme is better with the combination of vertical brace and oblique brace.
【作者单位】：北京工业大学建筑工程学院;湖南省第一工程有限公司;
【基金】：北京市自然科学基金项目(8122007)
【分类号】：U448.213;U445.72

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