拱坝应力控制标准研究

Study on the standards of stress control for arch dam

实践经验表明 ,我国现行混凝土拱坝设计规范存在下列问题 :应力标准与建筑物重要性无关 ,允许主拉应力与混凝土强度无关 ,拱坝应力分析主要采用多拱梁法和有限元法 ,但同一拱坝用不同多拱梁法程序计算的结果并不一致 ,尤其是拉应力相差较多 ,有限元法具有较强计算功能 ,但由于应力集中 ,计算的应力值很大 ,缺乏合适的应力控制标准。通过对影响拱坝应力控制标准的各项因素进行较深入的分析 ,提出了一套新的拱坝应力控制标准 ,使上述各问题都得到了解决。

The practice shows that the standard on concrete arch dam design in China has the problems as follows There is no relation between stress standard and the structure importance Main tensile stress is no relation with concrete strength The stress analysis on arch dam mainly uses multi arch beam method and finite element method, but the calculation results from the same arch dam are different when different programs of multi arch beam method are used, particularly in tensile stresses The finite element method has good calculation function but because of the concentration of stress, the calculated results of stress are big and it is short of proper stress control standard The author deeply studies and analyzes various factors affecting stress control standard of arch dam and puts forward a new stress control standard for arch dam to solve the above mentioned problems