刚构—连续组合体系梁桥合龙温度影响分析

Temperature Analysis of the Girder Bridge of the Rigid Frame-Continuous Composite System

以某刚构—连续组合体系梁桥为工程背景,采用桥梁专用软件建立考虑施工阶段的有限元模型,对刚构-连续组合体系梁桥合龙温度影响展开分析。基于数值理论方法,模拟3种合龙温度,分析对比该类桥梁在3种合龙温度作用下不同合龙顺序的受力及变形情况。结果表明,3种合龙温度工况下不同合龙顺序对主梁上、下缘压应力影响较小,合龙温度从10℃变为20℃,主梁竖向变形和墩顶纵向水平位移不断增大,且向量二范数不断增大;合龙方案①所引起的主梁竖向变形较小,且向量二范数较小。因此,合龙温度为10℃时的方案①为最优方案。本研究结果可为高墩多跨刚构-连续组合体系梁桥进行合龙方案比选提供参考。

Taking a frame-continuous composite beam bridge as the engineering background,the special software of the bridge is used to establish the finite element model considering the construction stage,analysis is carried out with respect of the influence of temperature on the girder bridge of rigid frame-continuous composite system.Based on the numerical theory method,the three types of closure schemes are simulated,and the force and deformation of the bridges under different temperatures are analyzed and compared.The results show that the different closure schemes have minor effect on the compressive stress of the upper and the lower edge of the main beam under the three temperature conditions,the temperature is changed from 10°C to 20°C,the vertical deformation of the main beam and the longitudinal horizontal displacement of the pier gradually increase,and the vector two norms constantly increase;the vertical deformation of the main beam caused by the scheme 1is small,and the vector two norms are small.Therefore,the scheme 1is the optimal scheme when the temperature of the closure is 10°C,which can provide reference for comparisons on the closure scheme for the rigid frame-continuous composite system beam bridge with high-pier and multi-span.