多层大悬挑钢结构施工全过程仿真分析研究  

Simulation analysis of construction process of multistory large cantilevered steel structure

作　　者：杨维国[1] 洪国松 王明珠[3] 杨国莉 张国军[3] 王树[3] 段有恒[1] 葛家琪[3] 周文胜 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]浙江精工钢结构有限公司,浙江绍兴312030 [3]中国航空规划建设发展有限公司,北京100120 [4]内蒙古鄂尔多斯市伊金霍洛旗政府投资基本建设办公室,内蒙古鄂尔多斯017200

出　　处：《建筑结构学报》2012年第4期87-94,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51178041;50808011);中国航空规划建设发展有限公司资助项目(技10研-19)

摘　　要：内蒙古伊旗全民健身体育中心工程上部结构采用多层大悬挑结构。大悬挑桁架根部应力高度集中,是结构的关键部位;位于悬挑桁架上弦处的楼板受拉、下弦处的楼板受压,楼板浇筑时机对结构体系受力、楼板本身受力状态有非常大的影响。采用Midas/Gen软件建立有限元模型,通过单元的"激活"与"钝化"建立施工过程的力学模型,对主体结构的施工安装过程、楼板刚度形成次序及关键构件安装次序进行计算模拟,分析了施工过程中结构内力变化及变形,得到了最佳施工安装方案。该方案在临时支撑部分卸载后安装悬挑根部构件,使关键构件内力得到优化,有效解决悬挑根部应力集中问题;在临时支撑完全卸载后浇筑桁架上弦处楼板,有效地减小了位于桁架上弦处混凝土楼板的拉力。The mian structure of the National Fitness Center in Ejin Horo Banner,Inner Mongolia is a multistory large cantilevered structure.The stress is highly concentrated at the end of the cantilevered truss which is the key part of the structure.The upper floor of the cantilevered truss is subjected to tension and the lower floor of cantilevered truss subjected to compression.The concrete pouring sequence of the floor has a great impact on the internal force of whole structure and itself.This paper used Midas/Gen to set up finite element model and achieve mechanical simulation by ＇ activation ＇ and ＇ passivation ＇ element.Then simulation of construction procedure,sequences of floor stiffness forming and installation order of key frame members were taken,and the inner force and deformation at the construction procedure were analyzed.On this basis,the best construction scheme was obtained.The scheme can optimize the internal force of key element and solve stress concentrate problems at the end of cantilevered truss by installation elements at the end of cantilevered truss after several steps of uninstall temporary supports.It can also reduce the tension at the upper floor of cantilevered truss by pouring the upper floor of cantilever truss after uninstall temporary supports completely.

关 键 词：多层大悬挑结构 施工模拟 内力重分布 施工次序 

分 类 号：TU393.304[建筑科学—结构工程]