斜腿刚构桥温度内力及温度变形分析

Analysis on temperature-induced internal force and temperature deformation of slant leg rigid frame bridge

为研究环境温度改变对于斜腿刚构桥的内力以及变形的影响,利用Midas Civil对某公路斜腿刚构桥建立有限元模型并分析其在全桥整体升温20℃及全桥整体降温20℃的两种不同工况下产生的温度内力以及温度变形。分析结构表明:温度内力及温度变形的最大值出现在桥面与斜腿连接的刚节点处,全桥升温对结构受力有利,桥梁降温对结构受力不利。

In order to study the influence of the environmental temperature change on internal force and deformation of slant leg rigid frame bridge, the Midas Civil was used to establish the finite element model of a highway slant leg rigid frame bridge and to analyze the temperature-induced internal force and the temperature deformation in two different conditions of the whole bridge temperature rise by 20 ℃ and the whole bridge decrease by 20 ℃. The analysis of the structure shows that, the maximum temperature-induced internal force and deformation value appear at the rigid connection of bridge deck and slant leg, and the temperature rise of the whole bridge is favorable for the structure stress, while the temperature decrease of the whole bridge is unfavorable for the structure stress.