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为了研究钢筋混凝土叠合梁受弯承载力可靠度变化规律,提出基于JC法(当量正态化法)的可靠度分析方法。考虑两阶段荷载比值k(第一阶段荷载与第二阶段荷载的比值)和荷载效应比n(可变荷载效应与恒荷载效应的比值)的影响,应用计算软件MATLAB进行数值分析。结果表明:k对叠合梁的可靠度影响很大,当k接近1.0时,叠合梁的可靠度最大;当k增大或减小时,叠合梁抗弯的可靠度均较低;随着n的增大,可靠度降低。当考虑k和n两个因素对受弯承载力可靠度的影响时,随着k的变大叠合梁受弯可靠度先增大后减小,在1.0附近可靠度达到最大值;与单独考虑荷载效应比n不同,此时随着荷载效应比n的增大,可靠度降低。
In order to study the variation of the reliability of flexural strength of RC beams, a reliability analysis method based on JC method (equivalent normalization method) is proposed. Considering the influence of two-stage load ratio k (the ratio of the first stage load to the second stage load) and the load effect ratio n (the ratio of the variable load effect to the constant load effect), the numerical analysis is carried out by using the MATLAB software. The results show that k has a great influence on the reliability of the composite beam. When k is close to 1.0, the reliability of the composite beam is the highest. When k increases or decreases, the reliability of the composite beam is low. With the increase of n Increase, the reliability is reduced. When the influence of k and n on the reliability of flexural capacity is considered, as the k increases, the bending reliability of the composite beam first increases and then decreases, and the reliability reaches the maximum near 1.0. Consider the load effect is different than n, then with the load effect than n increases, the reliability decreases.