基于美国规范的水工混凝土结构配筋设计方法"

Reinforcement design methods for hydraulic concrete structures based on American specification

首先介绍了美国水工钢筋混凝土相关规范与配筋设计理论,进而给出了水工钢筋混凝土结构设计的一般流程,结合中美规范在材料强度指标的差异给出了中美混凝土强度间的转换关系,并根据相关配筋公式编制了基于有限元应力计算结果的配筋计算程序,最后通过工程实例对比分析了中美规范在配筋方法与配筋量计算方面的不同.结果表明:经过材料强度换算后,同等轴力和弯矩条件下采用对称配筋设计,美国规范在小偏心受压区域计算得到的配筋量明显小于中国规范;在大偏心受压区域,随着轴力的减小,美国规范配筋量迅速增加,可能出现大于中国规范的情况,而后随着强度折减系数φ值从0.65增大到0.90,配筋量增幅速率放缓,配筋量又回到小于中国规范的情况.

Firstly the hydraulic reinforced concrete specifications and reinforcement design theory are intro- duced systemically; then the general process of hydraulic reinforced concrete design is presented. The strength transformation of concrete between the U. S and China Specifications is provided combined with differences in material strength indices in the two specifications. The computer program for reinforcement calculation based on finite element method is compiled according to the formulas of reinforcement. Finally, contrast analysis of the reinforcement method and reinforcement calculation between the U. S and China specifications is carried out through case study. The results show that, after material strength transforma- tion, when symmetrical reinforcement design is adopted, the quantity of reinforcement calculated in Amer- ican specification are much smaller than that in Chinese specification in small eccentric compression region under the condition of equivalent axial force and bending moment; in large eccentric compression region, with the decrease of the axial force, the quantity of reinforcement calculated in American specification in- crease rapidly and is probably larger than Chinese specification; then, with the increase of strength reduc- tion factor φ range from 0.65 to 0.90, the growth rate of reinforcement quantity slows down, so that rein- forcement quantity is less than that in Chinese specification again.