混凝土异形柱抗剪承载力可靠度分析及公式调整

Reliability analysis and formula adjustment for shear bearing capacity of RC specially shaped column

为确定《混凝土异形柱结构技术规程》(JGJ 149—2006)中异形柱抗剪承载力计算公式对应的可靠度水平是否满足《建筑结构可靠度设计统一标准》(GB 50068—2001)的相关规定,利用概率论原理、经验校准法及弯矩分配法、反弯点法推导了异形柱抗剪承载力的均值、变异系数及其与荷载的相关系数的计算公式。釆用可考虑随机变量相关影响的改进的JC法,分析了三种荷载组合情况下异形柱抗剪承载力可靠度水准,指出了不满足《建筑结构可靠度设计统一标准》中可靠度水准要求的工况。以此为基础,采用双系数调整方法建立了可满足《建筑结构可靠度设计统一标准》中可靠度水准要求的异形柱抗剪承载力设计公式,给出了双系数的高精度计算公式,可供修订《混凝土异形柱结构技术规程》参考。

In order to verify whether the reliability level of shear beating capacity formula in the Technical Specification for Concrete Structures with Specially Shaped Columns meets the requirements prescribed in the Unified Standard for Reliability Design of Building Structures, the calculation formulas for the mean value and the coefficient of variation of shear bearing capacity as well as the correlation coefficient between shear beating capacity and load were derived based on the probability theory, empirical calibration method, moment distribution method, and inflection-point method. The improved JC method considering the influence of random variables was employed to analyze the reliability level for specially shaped column under three different combinations of loads, and the cases of not meeting the Unified Standard for Reliability Design of Building Structures were emphasized. Furthermore, the dual-coefficient adjustment method was utilized to establish the shear bearing capacity formula for specially shaped column, which meets the requirements prescribed in the Unified Standard for Reliability Design of Building Structures. Finally, the high-precision dual- coefficient calculation formula was provided as a reference for revising Technical Specification for Concrete Structures with Specially Shaped Columns.