HRB500钢筋轻骨料混凝土偏心受压构件二阶效应计算研究

The Calcula tion Study on Second-order Effect on Eccentrically Compressed Lightweight Aggregate Concrete(LWAC) Members with HRB500 Steel Bar

按照我国混凝土规范和美国混凝土规范中偏心受压构件二阶效应的推导方法,分别推导了HRB500钢筋轻骨料混凝土偏心受压构件的二阶效应计算公式。通过推得的公式分别计算考虑二阶效应后HRB500钢筋轻骨料混凝土偏心受压构件的极限承载力,并且与试验结果相对比。研究表明:两种方法推得的二阶效应计算公式各有优缺点,采用我国规范推得的公式所计算的承载力与试验结果较为接近,采用美国规范推得的公式所计算的承载力仅在小偏心受压构件范围与试验结果接近,建议HRB500钢筋轻骨料混凝土偏心受压构件的二阶效应仍按普通混凝土规范的公式计算。

According to the derivation method of Chinese concrete standard and American concrete standard, the design formulas about second-order effect on eccentrically compressed lightweight aggregate concrete （LWAC） members with HRB500 steel bar ware derived, the ultimate bearing capacity by the formula and comparing with the experimental results was calculated. The results show that both calculation methods have their advantages and disadvantages. The capacity calculated by the formula derived in Chinese concrete standard is similar to the experimental result, and the other derived in American concrete standard is similar to the experimental result of compression member with small eccentricity. The advised formula of second-order effect on eccentrically compressed lightweight aggregate concrete member with HRB500 steel bar is still as same as Chinese concrete standard.