【作者】 周红军；

【导师】 张子明；

【作者基本信息】 河海大学 ， 固体力学， 2004， 硕士

【摘要】 大体积混凝土结构中，温度应力和温度控制对防止混凝土开裂具有重要的意义。徐变应力是温度应力的重要组成部分，在温度徐变应力计算过程中，混凝土的弹性模量与加载龄期有关，混凝土的徐变度不但与加载龄期有关，还与持荷时间有关，而且关系相当复杂。 本文研究了温度对混凝土徐变的影响机理。根据等效时间理论，将徐变表示为等效时间的函数，通过拟合试验数据，得出等效时间域弹性模量和徐变度公式的计算参数，推导了等效时间域的弹性徐变方程的初应变隐式解法。编制了平面有限元程序，模拟计算了岩基上长梁和太浦河泵站工程的温度徐变应力场，得出一些对工程设计和施工有益的结论。更多还原

【Abstract】 In mass concrete structures, temperature stress and temperature control are very important to avoiding crack of concrete. Creep stress is a key part of temperature stress. In the course of computation of thermal-creep-stress, elastic modulus of concrete is related to the age of concrete; creep of concrete not only is related to the age of concrete, but also loading duration and the relation is complex.In this paper, mechanisms of influence of temperature on creep are presented. According to the theory of equivalent time, creep as a function of equivalent time is expressed. By fitting experimental data, parameters of creep in equivalent time field are obtained; initial strain implicit solution of elastic creep equation in equivalent time field is derived. A 2-D FEM program is designed to simulate and compute thermal-creep-stress field in a long beam on batholith and Taipu River Pumping Station. Some conclusion available in designing and construction are presented.更多还原