单肢空心薄壁高墩大跨连续刚构桥稳定性分析  

Stability Analysis of Long-span Continuous Rigid Frame Bridge with High Single Hollow Pier

作　　者：张大琦 高雅 ZHANG Da-qi;GAO Ya(JSTI Group,Nanjing 210019,China)

机构地区：[1]苏交科集团股份有限公司,南京市210019

出　　处：《公路》2021年第8期137-141,共5页Highway

摘　　要：单肢空心薄壁墩作为高墩连续刚构桥桥墩的主要形式之一,在工程中广受青睐,但其稳定性计算与分析较少见诸于文献。以墩高132m的黄石特大桥为依托,运用Midas/Civil建立空间有限元模型,对单肢空心薄壁高墩大跨连续刚构桥的各个施工阶段的稳定性进行计算,并将计算结果与理论推导公式进行对比检验。计算结果表明,其各阶段稳定性满足要求;最不利稳定状态出现在最大双悬臂阶段;横向的墩顶系梁可以显著增加稳定性;风荷载及温度荷载对稳定性的影响不明显。运用理论公式进行静定状态的墩顶临界荷载计算,其结果和有限元计算结果吻合,既简单又符合实际情况,可以在设计中直接运用。Single hollow thin wall pier,as one of the main forms of high pier continuous rigid frame bridge pier,is widely used in practice,but its stability calculation and analysis are rarely appeared in documentation.Based on the Huangshi extra large bridge with the maximum pier height of 132m,in the paper a space finite element model is established by Midas/Civil to calculate the stability of the bridge at all stages of construction,and the calculation results are verified by theoretical derivation formula.The results show that:the stability of the bridge meets the requirements at all stages;the most unfavorable stability state appears in the maximum double cantilever stage;the lateral pier top tie beam can significantly increase the stability;and the influence of wind load and temperature load on the stability is not obvious.The theoretical formula is used to calculate the critical load on the top of the pier in a statically indeterminate state,and the result is consistent with the finite element calculation result,which is simple and in line with the actual situation,and can be directly used in the design.

关 键 词：大跨连续刚构桥 单肢空心薄壁墩 稳定性分析 屈曲分析 墩顶临界荷载理论公式 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]