钢屋盖结构液压顶推滑移时变模拟分析  

Time-varying Simulation Analysis of Hydraulic Pushing and Sliding of Steel Roof Structure

作　　者：邹怡菲 高珺恺 黄永周 魏鹏 朱靖申 郭彦林[2] ZOU Yifei;GAO Junkai;HUANG Yongzhou;WEI Peng;ZHU Jingshen;GUO Yanlin(Shanghai Baoye Group Co.,Ltd.,Shanghai 200941,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]上海宝冶集团有限公司,上海200941 [2]清华大学土木工程系,北京100084

出　　处：《施工技术》2020年第20期14-20,共7页Construction Technology

基　　金：国家“十三五”计划重大专项支持(2016YFC0701204)。

摘　　要：利用有限元方法中的生死单元技术、接触分析和位移加载,对某钢屋盖结构拼装与滑移全过程进行时变模拟分析。计算过程中屋盖每个时刻应力与变形,均考虑了此前所有滑移施工过程的影响。计算结果表明,滑移过程中钢屋盖最大应力为159.7MPa,出现于滑移结束时的加强桁架跨中上弦杆;最大挠度为188.6mm,出现于第14次滑移过程中最前端跨中下弦杆。滑移全过程中屋盖完全处于弹性状态,变形处于施工工艺允许范围内,说明施工方案安全可行,且实测应力数据与有限元计算结果吻合良好。对屋盖滑移结束状态荷载效应进行独立分析,与时变分析结果进行比较发现,时变分析结果更准确,能更有效地为施工方案优化提供参考。对屋盖滑移方案进行扩展计算,不设置加强桁架的屋盖拓展滑移模拟分析表明,滑移过程屋盖超应力构件较多,变形过大,反证了加强桁架有效性和必要性。Based on dead-live element technique,contact analysis and displacement loading in finite element method,a continuous construction simulation analysis covering the whole component-assembling and sliding process is conducted to study the stress and deformation of a steel roof. And any results from the continuous analysis takes into consideration the influence of all previous sliding stages on the current sliding stage,thus are accurate and reliable. The computational results show that the maximum stress of roof members is 159. 7 MPa,which appears at the middle of the top chord of strengthening truss when all sliding stages are finished. And the maximum deflection is 188. 6 mm,which appears at the middle of the foremost bottom chord of the roof during the 14 th sliding stage. The roof members are completely in elastic state and the deformations are acceptable,validating the sliding scheme being safe and feasible. The stress data from continuous sliding analysis shows good agreement with on-site measured data,proving the accuracy of continuous sliding analysis. In addition,traditional non-continuous sliding simulation analysis is also conducted focusing on the final state of steel roof,and the obtained result is compared with that of continuous sliding simulation. The comparison shows that continuous analyses can more accurately reflect the behavior of the steel roof during component-assembling and sliding process and provide reference for optimization of the construction scheme. Another sliding scheme of steel roof without strengthening truss is also analyzed and the results show that the stress of roof members will exceed the yielding stress of steel and the deflection is so large as to affect the roof sliding operation,which proves the effectivenes and necessity of strengthening truss.

关 键 词：钢结构 屋盖 滑移 时变分析 有限元分析 

分 类 号：TU758.[建筑科学—建筑技术科学]