无应力状态有限元法在桥梁竖转施工中的应用  

Application of Unstressed State Method in Vertical Rotation Construction of Bridges

作　　者：李文武[1] 潘胜山[1] 张哲[1] 叶毅[1] 

机构地区：[1]大连理工大学桥梁工程研究所,大连116023

出　　处：《武汉理工大学学报》2010年第21期46-50,共5页Journal of Wuhan University of Technology

基　　金：国家交通部西部建设基金(200631882350)

摘　　要：基于经典杆单元和悬链线单元,开发了动态无应力长度杆单元和动态无应力长度悬链线单元。提出动态无应力状态有限元法,将单元的无应力长度作为有限元计算的输入量,通过修改单元无应力长度来调整索单元索力。该方法在模拟桥梁负角度竖转施工时只需建立转体初始状态的有限元模型,通过修改扣索和牵引索单元无应力长度模拟转体全过程,并准确的计算出各阶段扣索、牵引索索力及结构内力。该方法也可用于模拟斜拉桥、悬索桥等缆索结构索单元的张拉施工过程。以实例验证了该方法的正确性及其在实际工程中的应用价值。A dynamic unstressed length link element and catenary element is developed based on classical link element and catenary element.And a dynamic unstressed finite element method is proposed which takes unstressed length as input of the finite element and adjusts cable force by modifying unstressed length of element in finite element calculation.Only a finite element model for initial stage of rotation needs to be set in simulating bridge construction of vertical rotation from above to below,and the whole rotation process could be simulated only by adjusting unstressed length of buckle cable and tractive cable,the internal force of buckle,tractive cable and structure in each construction stage can be accurately calculated.This method can also be applied to tension process for cable-stayed bridge,suspension bridges and other cable structure bridges.This paper takes case study to show the correctness of this method and its practical engineering value in application.

关 键 词：动态无应力状态有限元法 负角度竖转施工 索单元 施工仿真模拟 钢筋混凝土箱拱桥梁 

分 类 号：U445.46[建筑科学—桥梁与隧道工程]