某网架杆件弯曲的原因分析及处理  

Cause and Treatment of Bending Bars of a Grid Structure

作　　者：王晓娟 肖建春[2] 罗杰[2] 

机构地区：[1]贵州中烟工业有限责任公司,贵阳550001 [2]贵州大学空间结构研究中心,贵阳550003

出　　处：《工程建设与设计》2016年第1期24-25,29,共3页Construction & Design for Engineering

基　　金：贵州省教育厅自然科学研究项目[黔教合KY字(2012)045号]

摘　　要：某平面尺寸为81m×42m的正放四角锥螺栓球节点网架采用周边上弦多点支承与中部下弦2点支承相结合的约束形式。在安装完成后,网架出现了明显的杆件弯曲现象。经过分析,引起杆件弯曲的主要原因是网架上弦周边支座的钢底板和加劲板式橡胶垫的螺栓孔开孔过小。接触力学分析得出,支座钢底板和加劲板式橡胶垫的螺栓孔开孔过小导致加劲板式橡胶支座的实际水平约束刚度约为原设计计算模型的386.6倍。对不合要求的支座采用分批拆换的方法处理,对弯曲杆件采用侧焊扁钢加强。经过3年的观测,处理后网架未见任何异常情况。The constraint of a spatial square pyramid grid with bolt-sphere joints which the plane size is 81 m×42m used the form of surrounding upper chords supported by multi point and two points in the central bottom chords combined. After the installation was completed, there was a clear bars bending phenomenon in the grid structure. Through the analysis, the main reason causing the bars bending was the bolt hole on the steel plate mad stiffening plate rubber pad of the surrounding upper chords beatings opened too small. Through the contact mechanics analysis, the bolt hole on the steel plate of beating and the rubber pad of laminated rubber bearing was too small that leading to the actual horizontal restraint stiffness of the laminated rubber bearing was 386.6 times bigger than the original design computational model. The bearings didn＇t meet the requirements used the batch replace method, the strengthening ofbending bars used method of welding steel in the lateral direction. After three years of observation, the grid did not have any abnormalities after treatment.

关 键 词：事故分析与处理 接触力学 设计与施工 网架 

分 类 号：TU356[建筑科学—结构工程]