基于球铰应力差法的T构转体桥不平衡力矩预估  

Estimation of Unbalancing Torque of Rotationally Erected TFrame Bridge Based on Ball Joint Stress Difference Method

作　　者：车晓军[1] 张谢东[1] 朱海清[1] 

机构地区：[1]武汉理工大学交通学院,湖北武汉430063

出　　处：《桥梁建设》2014年第4期57-61,共5页Bridge Construction

基　　金：内蒙古自治区交通科技项目(NJ-2012-18)~~

摘　　要：为对T形刚构转体桥转体前的平衡配重提供依据,对该类桥梁转体时的不平衡力矩预估方法进行研究。根据偏心受压构件应力分布规律,推导出该类桥梁基于球铰下应力差的不平衡力矩理论计算公式,进而运用通用有限元软件建立球铰细部分析模型,对不平衡力矩的数值进行预估,并结合称重试验实测数据,对比分析预估方法的可行性和预估数值的工程精度。通过工程实例分析表明:基于应力差法预估T形刚构桥转体时的不平衡力矩,方法简便可行,且预估数值具有足够的工程精度,可根据预估结果对该类桥梁转体进行平衡配重。To provide basis for the arrangement of counterweight for the T-frame bridge before it was rotationally erected,the estimation method for the unbalancing torque of the bridge of similar kind being rotationally erected was studied.In compliance with the stress distribution law of eccentric compression components,the theoretic calculation formula for the unbalancing torque of the bridge based on the ball joint stress difference was derived.The universal finite element software was used to establish the analysis model for the ball joint details and the values of the unbalancing torque were estimated.With reference to the data measured in the weighing test,the feasibility of the estimation method and the accuracy of the estimated values were compared and analyzed.The analysis of the actual examples demonstrate that the estimation method for the unbalancing torque of the bridge based on the stress difference method at the time the bridge is being rotationally erected is simple and feasible,the estimated values have sufficient accuracy and the counterweight can be arranged according to the results of the estimation.

关 键 词：跨线桥 T形刚构桥 不平衡力矩 球铰 应力差 预估 有限元法 

分 类 号：U448.231[建筑科学—桥梁与隧道工程]