【摘要】 本文用有限元法研究了在线性徐变条件下,混凝土的拉伸徐变和压缩徐变不相等时的结构应力把徐变变形看作是初应变,给出计算徐变变形的递推公式,从而可不必记录历史应力而得到隐式解法.文末算例说明,在一般混凝土坝中掺加粉煤灰后,由于混凝土的拉压徐变不相等,对其温度徐变应力有相当的影响.更多还原

【Abstract】 In this paper the structural stress analysis considering the difference between the tensile and compressive creeps is made by using the FEM under the condition of linear creep by taking the creep strain of concrete as the initial strain. The recurrence formula for computing the creep strains is given, so the solutiou of the implicit method can be established without recording the stress history. A worked example given at the end of this paper shows that the difference between the tensile and compressive creeps of the fly-ash concrete will cause great influence on the thermal creep stress of structures.更多还原