简支转连续梁桥单(双)支座脱空受力分析

针对先简支后连续梁桥经常出现的支座脱空现象,利用大型桥梁专用有限元软件分别模拟单支座和双支座两种支承形式下不同支座脱空位置,分析支座脱空后桥梁支座反力的变化规律及支座脱空对桥梁内力的影响。研究结果表明,边支座脱空较中支座脱空对相邻支座影响大;在恒载作用下支座脱空导致相邻主梁墩顶负弯矩增大,在活载作用下主梁内力变化较小。

Mechanical Analysis of Single(Double)Support Disengaging of Simply Supported Continuous Girder Bridge

In view of the phenomenon of support disengaging often appearing in the simply supported continuous beam bridge, by using special finite element software of large bridge, the disengaging positions of different supports are simulated under two supporting forms such as single support and dual support. The variation law of the reaction force of the bridge support and the influence of the support disengaging on the internal force of the bridge are analyzed. The results show that the effect of the side support on the adjacent support is larger than that of the middle support. Under the action of dead load, the negative bending moment at the abutment of the adjacent main girder is increased because of the disengaging of the support. Under the action of live load, the internal force of the main girder changes little.