摘要
为解决大跨度钢结构因变形失稳、应力集中造成施工难度大及节点易破坏等技术难题,本文以双龙生态公园2号游客服务中心(国际山地旅游联盟总部)大跨度钢结构工程为例,采用有限元软件Midas Gen800对三角形管桁架结构的中间榀桁杆和腹杆所受轴力进行仿真计算,研究不同载荷下管桁架结构力学性能。为验证仿真结果的可靠性,采用振弦式应变计对管桁架杆件表面温度和振动频率进行测量,计算出杆件的应变和最大应力。仿真及试验结果表明,倒三角形管桁架管端部杆件所受内力与跨中所受内力差距较大,且施加载荷、固定约束和杆件表面温度对管桁架变形有较大影响,弦杆产生最大应力为-25.52 MPa,实验结果与中间榀桁杆数值模拟所受到的应力值相仿,验证了数值模拟结果的可靠性。最后,提出管桁架结构变截面设计、施工环境温度控制和多点支撑的施工方法,有效减少施工成本,提高施工质量。
In order to solve the technical problems of large-span steel structure,such as large deformation,instability and stress concentration,which make construction difficult and nodes easy to destroy,this paper takes the large-span steel structure project of No.2 tourist service center of Shuanglong Ecological Park( headquarters of International Mountain Tourism Union) as an example,and uses Midas gen800,a finite element software,to simulate the axial forces on the truss and web members of the middle truss of the triangular tube truss structure. The mechanical properties of tube truss structures under different loads are studied. In order to verify the reliability of the simulation results,the vibrating string strain gauge is used to measure the surface temperature and vibration frequency of the tube truss members,and the strain and maximum stress of the members are calculated. The results of simulation and test show that there is a big difference between the internal force of the end members of inverted triangle tube truss and the internal force of the middle span,and the application of load,fixed constraint and the surface temperature of the members have a great influence on the deformation of tube truss. The maximum stress of chord is-25.52 MPa. The experimental results are similar to the force of the numerical simulation of the middle truss,which verifies the reliability of the numerical simulation results. Finally,the construction methods of variable cross-section design,construction environment temperature control and multi-point support are put forward to effectively reduce construction cost and improve construction quality.
作者
周晨
刘洋
靳壮壮
ZHOU Chen;LIU Yang;JIN Zhuangzhuang(China Railway Fifth Group Construction Engineering Co.,Ltd,Guiyang 550009,China;College of Mechanical Engineering,Guizhou University,Guiyang 550025,China)
出处
《贵州大学学报（自然科学版）》
2020年第2期92-97,112,共7页
Journal of Guizhou University:Natural Sciences
基金
贵州省科技计划资助项目资助(黔科合平台人才[2019]5616号)
贵州省科技支撑计划资助项目资助(黔科合LH字支撑〔2017〕7236)
关键词
大跨度钢结构
有限元仿真
力学性能
变形控制
large span steel structure
finite element simulation
mechanical properties
deformation control
作者简介
通讯作者:周晨(1982-),男,高级工程师,硕士,研究方向:建筑结构工程及地下工程防灾减灾,Email:30082213@qq.com.
