李  东1   李永和1   李智文2   郝际平3

   （1 上海大学土木工程系 200072； 2 西安市政建设一公司； 2 西安建筑科技大学 710055）

 

[提要]  公路立交桥路面与桥面相接处桥台一般为块体结构。由于桥台体积较大，混凝土施工过程中因水化热温度应力的影响，在外界气温较低时，不均匀的降温极易产生拉应力，当超过早期硬化强度时便产生裂缝，体内存在不均匀应力，对结构受力有影响。该桥台温度应力有限元分析说明应采取施工和结构措施加强对裂缝的控制。
[关键词]  水化热应力  干缩应力  裂缝  数值计算分析

The R.C. structure abutment is in mass of shape with lower height at connection joints between beams of viaduct and road. Due to its large volumn,the uneven tensile stresses field in concrete are produced easily because of hydration heat of concrete in construction when air temperature is low. As soon as the tensile stresses in concrete exceed its hardening strength, the cracks in concrete would take place.Temprature stresses FEM analysis show that we must take construction ancl structure measures to control the crack in R.C.abutment.
Keywords: abutment; stresses; hydration  heat; shrinkage; crack; concrete; numerical  analysis