露天网架的温度应力作用分析

网架结构是高次超静定结构，在均匀温度场变化下由于杆件不能自由热胀冷缩会产生温度应力．本文研究露天大跨度网架结构在外界温度交替变化下产生的内力和位移是否起到控制荷载作用，利用SAP2000对网架进行静力和温度荷载作用下的计算，最终通过结果比较得出温度影响在整体网架受力中占的比例，以及结构应力性质的变化．

Effect of the temperature stress on open space truss

The Space truss is the statically indeterminate structure of the high-order, which will produce temperature stress under the changes of uniform temperature field due to rods that can not freely expand with heat and contract with cold. It was studied whether the internal force and displacement of the outdoor large-span grid structure were the control load under the various changes of the outside temperature. By using SAP2000, the effect of static and temperature loads on the space truss was calculated, and by comparing the re- suits it is concluded that the temperature influence plays an important role in the whole rack , and what percentage of the temperature influence accounted for in the proportion of force was computed in detail, as well as changes in the properties of structure stress were obtained .