某大跨度钢管混凝土拱桥静动载检测、病害及其加固分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Wind Resistance Optimization of Spatial Truss Structures by the Tooth-shaped Method

作者:: 欧耀文; 周朝阳.; 中南大学土木工程学院,湖南长沙410075;长沙生物医院园浏阳工业新城建设开发公司,湖南长沙410331, 中南大学土木工程学院,湖南长沙,410075

Author(s):: HUANG You-qin; WANG Yan-ping; FU Ji-yang; LIN Jun-hong; WU Jiu-rong; Engineering Technology Research and Development Center for Structural Safety and Health Monitoring in Guangdong Province,Guangzhou University ，Guangzhou 510006，China

Keywords:: spatial truss structures; wind resistance optimization ; criteria method; ray step; area lower limit

摘要:: 为了评估已建重型公路桥梁的荷载工作性能,有必要进行动静载实验方案.建立了有限元模型,设计了5个跨度的静载实验,用ANSYS计算了拱脚最大水平推力(工况1),吊杆轴力(工况2),拱脚最大负弯矩(工况3)、主拱圈最大正弯矩(工况4),纵梁(包括边纵梁和中纵梁)最大正弯矩(工况5)应力、应变参数；用Midas计算了动载实验各个工况的模态和动挠度.以第16实验跨为例子,评价了该桥的工作状况:振动频率大于理论计算频率,且平均超出规定值的12％,说明该桥在动荷载作用下刚度不能满足设计要求.最后提出了加固和维修方案,并对施工难易,效率进行了比较,可供国内外同类型桥梁检测和维修加固借鉴.

Abstract:: Optimization studies on wind-sensitive structures focus on high-rise buildings,and large span spa-tial structures have seldom been involved. For optimization problems with a lot of design variables,the criteriamethod is usually effective. Design theory and numerical program of wind resistant optimization for complexspatial truss structures are firstly presented.Then,a real double-layer cylindrical reticulated shell is optimizedbased on the equivalent static wind loads from wind tunnel tests,discussing the influences of area lower limitand full stress step.The results show that the total structural weight is decreased by 48% when the maximumstress is less than the initial correspondent. By setting area lower limit,suitable area distribution is obtained,and material performance is fully made use of to achieve less structural weight.