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拱坝属高次超静定空间壳体结构,混凝土徐变变形对拱坝应力的影响十分重要.文献[1]采用纯拱法,研究了拱结构的应力随时间重新分布的规律,文献[2]以考虑扭转作用的拱冠梁法为基础,采用伽辽金法和逐次数解法,在拱坝计算中计及了徐变影响.文献[1],[2]研究了徐变对拱坝应力的影响.但是,对于大型工程,纯拱法显然过于粗糙,拉普拉斯变换无法用于高次超静定的拱坝结构分析,而文献[2]的方法过于繁冗.这些方法既不能给出徐变对拱坝应力影响的全貌,也难以用于工程实际计算. 实践证明,目前在实际工程中被广泛采用的初应变法是较好的方法.初应变法是一
Arch dam belongs to high-order hyperstable space shell structure, the effect of concrete creep deformation on arch dam stress is very important. [1] Pure arch method was used to study the law of arch structure stress redistribution with time. The literature [ 2] Based on the crown-and-beam method considering torsion, Galerkin method and successive number solution method are used to calculate the influence of creep in the arch dam calculation. [1], [2] However, for large-scale projects, pure arch method is obviously too rough, Laplace transform can not be used for structural analysis of high degree of statically indeterminate arch dam, and the method of [2] is too complicated.These methods both Can not give the whole picture of the influence of creep on the stress of arch dam and it is hard to be used in actual engineering calculation.It has been proved by practice that the initial strain method which is widely used in practical engineering is a better method.It is a