【摘要】 以水平地震与竖向荷载组合作用下的RC框架柱为研究对象,推导截面偏心距与荷载效应比的关系式。接着依据已有的水平地震概率模型与楼面恒荷载、活荷载概率模型,分析偏心距设计值在总体样本点与失效样本点中分别具有的保证概率。然后采用Monte Carlo方法分析RC框架柱可靠度水平随多个参数的变化规律。结果表明:RC框架柱的承载力抗震可靠指标随弯矩效应比和轴压比设计值的变化较为明显,且弯矩荷载效应比越大、轴压比设计值越小,对应的可靠指标越低。与设计目标可靠指标相比,现行规范中RC柱的承载力抗震调整系数值是偏低的,在多数情形下应提高至0.9或1.0。这为合理进行RC框架柱的抗震设计提供了有益参考。更多还原

【Abstract】 The correlation function between eccentricity and load effect ratio was obtained for RC frame column under combined actions of horizontal earthquake and vertical load.With the current statistical models of horizontal earthquake,floor dead load and live load,the guaranteeing probability of design value of eccentricity in the whole samplings and failure samplings was analyzed.Then,the varying law of reliability with different parameters was analyzed with the Monte Carlo method for RC frame columns.The results show that the reliability of bearing capacity is obviously affected by moment effect ratio and axial compression ratio,and it is low when moment effect ratio is large and axial compression ratio is small.Compared with the target design reliability index,the seismic adjustment coefficient of bearing capacity needs to be increased to 0.9 or 1.0 in most cases,since the corresponding values are low in the current design code.This provides some useful references for reasonable seismic design of RC frame columns.更多还原