基于ANSYS的桥梁结构收缩徐变效应仿真计算

The calculating simulation on shrinkage and creep effects of bridge structures with ANSYS

针对ANSYS中不包含与中国现行规范相匹配的混凝土收缩徐变计算功能的现实,基于收缩应变与温降应变效应相同、混凝土徐变与金属蠕变类似的应力应变等效思想,提出在ANSYS中运用温度效应等效混凝土收缩效应,并采用Creep准则模拟混凝土徐变效应的方法,弥补了ANSYS不能进行收缩应变分析的不足.以两个不同的工程实例为研究对象,对不同有限元软件的计算值和理论值进行了比较,并对其合理性进行了验证.研究结果表明:运用温度效应等效混凝土收缩,采用Creep准则模拟混凝土的徐变是合理、可行的.

In our country, there aren＇t a current specification for concrete shrinkage and the creep calculation function in ANSYS based on the principles that the shrinkage strain has the same effect with the temperature drop strain, as well as the equivalent principle of stress and strain, the creep of concrete is similar to the metal creep. Tem- perature effects are adopted ,and are equivalent to concrete shrinkage and the method of creep criteria is used to simulate the concrete creep to make up for the weakness that shrinkage strain can＇t be analyzed in ANSYS. Take two engineering examples as the re- search object, the calculated results of different finite element softwares are compared with the theoretical values to verify its rationality. The result shows that this method is reasonable and feasible.