大跨度带腹拱V形支撑连续梁桥0#块极限承载能力分析  

Ultimate Bearing Capacity Analysis of the 0# Block of Long Span Continuous Beam With V-shaped Support and Abdominal Arch

作　　者：唐杨 Tang Yang(College of Civil Engineering,Chongqing Jiaotong University,400074,China)

机构地区：[1]重庆交通大学土木工程学院,400074

出　　处：《特种结构》2018年第4期86-91,共6页Special Structures

摘　　要：目前尚未见报道有关大跨度带腹拱V形支撑连续梁桥0#块的裂缝宽度及极限承载能力的相关研究成果。本文依托桂林龙门大桥新建工程项目,以Midas/Civil分析出来的0#块施工过程中最危险的施工阶段为基础,建立Midas/FEA三维实体有限元模型,考虑混凝土开裂的材料非线性,运用混凝土的弥散裂缝模型,计算得到各荷载步下的结构应力以及混凝土的裂缝宽度,计算分析得到在自重工况下0#块不会出现裂缝,极限承载能力为自重工况下承载能力的3.04倍,表明结构施工状态下有足够的安全储备。同时,通过计算各荷载步下的结构应力和变形,得到了该种结构的受力特性,供设计与施工人员参考。The research results on the crack width and ultimate bearing capacity of the 0# block of the V-shaped continuous beam bridge with large span are not reported. Based on the finite element model of Midas/ FEA three-dimensional solid model, considering the material non-linearity during the concrete cracking, the structural stress of concrete and the crack width of concrete were calculated by using the dispersion crack model of concrete. Based on the new engineering project of Guilin Longmen Bridge, the calculation results show that there is no cracks in the 0# block under the self-weight condition, and the ultimate bearing capacity is 3.04 times the value of the self-weight condition, which indicated that there are sufficient safety reserve in the construction state. At the same time, by calculating the stress and deformation of the structure, the mechanical properties of the structure are obtained for the references to the design and construction personnel.

关 键 词：腹拱 V形腿 0#块 裂缝宽度 极限承载能力 

分 类 号：U441[建筑科学—桥梁与隧道工程]