摘要
洛阳市隋唐城天堂遗址保护钢塔通过大跨度转换桁架结构支撑在基础环梁上,以保护塔下中心地带天堂遗址区。采用ANSYS建立三维有限元模型模拟转换桁架卸载施工。并根据有限元模拟结果确定卸载施工工艺流程。内、外环梁临时支撑点千斤顶分别缩缸8,4mm后可完成卸载。卸载时各支撑点按2次卸载,每次卸载量为总卸载量的一半,内圈和外圈临时支撑交替卸载。卸载施工时对转换桁架关键构件部位进行了应力与沉降监测。监测结果显示,实测值与理论值间最大应力误差为3.28MPa,最大位移误差为0.82mm,误差较小,结构整体刚度较好,有限元模型模拟精度较高。
Luoyang paradise tower was supported on the basis of a conversion ring beam to protect the heart area of Sui-Tang ruins paradise under the tower through a large-span steel truss structure. A 3D finite element model was used to simulate the unloading construction course of the converter truss by ANSYS. And based on the finite element simulation results the unloading construction process was designed which the temporary support jacks under the inner or outer ring beam were retracted 8, 4mm respectively to complete the uninstall process. During the unloading course each supporting point unloaded for two times, firstly unloaded half of the total amount of unloading displacement, and the temporary support of the inner and outer rings were unloaded alternately. The stress and subsidence of the key components of the conversion truss were monitored. Monitoring results showed that the maximum stress error between the measured values with the theoretical value was 3.28MPa and the maximum displacement error was 0. 82mm. The errors were small which proved the overall stiffness of the structure was enough and the finite element model simulation was accurate.
出处
《施工技术》
CAS
北大核心
2014年第8期65-69,共5页
Construction Technology
基金
河南省教育厅自然科学研究计划项目(2011B130001)
科学技术研究重点项目计划(13B130110)
关键词
钢结构
转换桁架
卸载
施工
有限元分析
监测
steel structures
conversion trusses
unloading
construction
finite element analysis
monitoring
