矩形截面钢筋混凝土柱极限曲率计算研究

Calculation of ultimate curvature of rectangular reinforced concrete column

为建立准确的、具有实际物理意义的极限曲率分析模型和极限曲率计算公式,选取30组共130根以弯曲和弯剪型破坏为主的钢筋混凝土柱拟静力试验,给出了一种考虑裂缝分布高度的塑性铰长度定义方法,使塑性铰长度有了实际物理意义.根据塑性铰长度与变形之间的量化关系及等效曲率分布模型,给出了矩形截面钢筋混凝土柱的极限曲率计算式,并与已有曲率公式计算值进行了对比.结果表明:本文建议公式计算值与曲率试验值之比的平均值为1.038,均方根误差为0.656,与试验结果吻合度最高,可用于矩形截面钢筋混凝土柱的极限曲率计算研究.

In order to establish an accurate and practical physical significance of the ultimate curvature analysis model and the ultimate curvature calculation formula,30 groups of 130 reinforced concrete columns with bending and bending shear failure are selected for pseudo static tests,and a plastic hinge length definition method considering the height of crack distribution is given,so that the plastic hinge length has practical physical significance.According to the quantitative relationship between plastic hinge length and deformation and the equivalent curvature distribution model,the ultimate curvature calculation formula of reinforced concrete columns with rectangular section is given,and the calculation value is compared with the existing curvature formula.The results show that the average value of the ratio of the calculated value of the proposed formula to the curvature test value is 1.038,and the root mean square error is 0.656,which has the highest coincidence with the test results,and can be used for the calculation of the ultimate curvature of rectangular cross-section reinforced concrete columns.