SAP2000单元截面非线性温度梯度的计算方法

SAP2000 Calculation Method for Nonlinear Temperature Gradient of Element Cross-section

通用结构分析软件SAP2000不支持单元截面非线性温度梯度的输入,严重制约其在桥梁某些领域的运用(例如其无法准确计算独柱墩混凝土弯桥的横向倾覆稳定性,因为非线性温度梯度对混凝土弯桥受力有相当大的影响)。研究提供一种解决方案,将单元截面的非线性温度梯度等效转化为“均匀温差+线性温度梯度”的组合,使SAP2000软件能够计算单元截面的非线性温度梯度,从而更好地分析桥梁结构。照此方案使用SAP2000软件对连续梁结构实例进行非线性温度梯度计算,并用桥梁博士V3.2软件进行验证。

General structural analysis software SAP2000 does not support the nonlinear temperature gradient of element cross-section.This restricts its application in some fields of bridges(for example,it cannot accurately calculate transverse overturning stability of concrete curved bridge with single pier,because the nonlinear temperature gradient on concrete curved bridge has a great influence).The research provides a solution to effectively transform the nonlinear temperature gradient of element cross-section into the combination of“uniform temperature difference+linear temperature gradient”,then SAP2000 is able to calculate the nonlinear temperature gradient of element cross-section,so as to better analyze the bridge structure.According to this method,the nonlinear temperature gradient of continuous beam structure is calculated by SAP2000 and verified by Dr.Bridge V3.2 software.