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根据平截面假定和《混凝土结构设计规范》(GBJ10 89)所规定的基本原则 ,考虑不同的受力情况 ,分别对钢筋混凝土偏心受拉构件正截面强度进行了分析。对按规范公式计算的结果与根据平截面假定计算的结果进行了比较 ,同时还分析了受拉区配筋率和受压区配筋率对钢筋混凝土偏心受拉构件正截面破坏形式和弯矩 -纵向拉力相关曲线的影响。结果表明 :增加受压区配筋率和受拉区配筋率均可增大m -n相关曲线所包围的面积 ,提高钢筋混凝土偏心受拉构件的承载能力。根据受压区配筋率、受拉区配筋率和纵向拉力位置的不同 ,钢筋混凝土偏心受拉构件的破坏形式也不同。对于小偏心和大偏心的适筋破坏形式 ,规范公式精度较好 ,但对超筋破坏形式 ,规范公式误差较大 ,且偏于不安全。
Based on the assumption of flat section and the basic principle stipulated in “Code for Design of Concrete Structure” (GBJ1089), considering the different forces, the strength of normal section of eccentric component of reinforced concrete is analyzed. Comparing the results calculated according to canonical formula with the results calculated according to the assumption of cross section, the failure modes of normal cross section and the bending moment of RC eccentric component are also analyzed. Effect of Longitudinal Tensile Correlation Curves. The results show that both increasing the compression ratio of the compression zone and the reinforcement ratio of the tension zone can increase the area surrounded by the m -n correlation curve and increase the bearing capacity of the RC member. According to the compression ratio of compression zone, the reinforcement ratio of tension zone and the location of longitudinal tension, the failure modes of RC eccentric members are also different. For the small eccentric and big eccentric tendon damage form, the standard formula accuracy is better, but the form of super-bar damage, standard formula error is larger, and partial to unsafe.