考虑温度荷载等效的某钢管混凝土桥徐变分析

Analysis on Creep of a Concrete-filled Steel Tube Bridge Considering Equivalent Temperature Load

摘要:

既有钢管混凝土桥梁徐变公式计算复杂，难以在工程中普及应用。首先推导了徐变系数的关系式，将徐变效应等效为温度荷载以便于在MIDAS Civil软件中应用。基于某钢管混凝土桥梁计算了徐变等效温度，进一步分别建立了两个模型（考虑钢管约束效应与不考虑钢管约束效应），经计算分析可知，关键施工阶段在两种工况下误差约在50%左右，徐变计算所用的系数需要考虑钢管约束效应。

Abstract:

The calculation of creep formula for an existing concrete-filled steel tube bridge is complex and difficult to popularize and apply in the projects. The relationship formula of creep coefficient is derived, and the creep effect is equivalent to temperature load for the application in MIDAS Civil software. Based on a concrete-filled steel tube bridge, the creep equivalent temperature is calculated. Furthermore, two models are established (considering the restraint effect of steel pipe and not considering the restraint effect of steel pipe). Through the calculation and analysis, it is found that the error in the key construction stage under the two working conditions is about 50%. The coefficient used in creep calculation should take into account the restraint effect of steel pipes.