中文摘要：

为计算钢筋混凝土拱的承载力,通过将钢筋混凝土拱等效成相应长度的偏压柱,然后按偏压柱的公式进行承载力计算.对中国规范、美国规范、日本规范中拱圈计算长度取值方法进行比较,结合所收集的55座钢筋混凝土拱桥资料,发现在常用的矢跨比范围内,三个规范的拱圈计算长度取值基本一致.为验证拱圈计算长度取值的合理性,分别采用经过试验验证的有限元法和等效梁柱法,对一座钢筋混凝土拱桥主拱的承载力进行计算,并进行参数分析,发现等效梁柱法的计算结果均低于有限元法的计算结果,偏于安全.

英文摘要：

To predict the load - carrying capacity of the rein~brced concrete arch, in this method the concrete arch is simulated to an eccentrically - loaded column with the equivalent length, then the for- mulas of the eccentrically - loaded column were used to the calculation of load - carrying capacity of arch. The evaluations for calculating the equivalent length （ taking - value method） of arch ring in Chinese codes, the United States codes and Japanese codes are compared, and the data of 55 rein- forced concrete arch bridges are collected. It is found that the equivalent length of arch ring in three codes is almost the same within the scope of the commonly used rise - span ratio. In order to verify the rationality of taking - value method of the calculation length of arch ring, the load - carrying capacities of the main arch for a reinforced concrete arch bridge are calculated by equivalent beam -column method and finite element method verified by test respectively, and the parameter analysis method is used also, it is found that the equivalent beam - column method is conservative by the comparison that the calculation results by the equivalent beam - column method are less than the results by the finite element method.