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鉴于GB 50068—2001《建筑结构可靠度设计统一标准》给出的混凝土梁抗力概率模型和设计分项系数值主要是针对普通混凝土梁构件,对预应力因素的影响考虑不够充分。针对此不足,采用Monte Carlo抽样方法并结合已有的承载力计算式和各种抗力因素的概率模型,得到不同预应力筋、钢筋配置量下混凝土梁的精细抗力概率模型。在此基础上,分析预应力混凝土梁设计可靠度随多个参数变化的规律。结果表明:预应力混凝土梁结构的设计可靠度均随预应力筋配置量的增加而有较大幅度增长,因此在抗震和非抗震两种组合情形下仅用普通混凝土梁的可靠指标来代表预应力混凝土梁的可靠性,均会低估其与设计目标的偏差。
In view of GB 50068-2001 “unified standards for the design reliability of building structure” given concrete resistance probability model and design sub-coefficient values are mainly for ordinary concrete beam components, the impact of prestressing factors not fully considered. In order to solve this problem, the Monte Carlo sampling method is used in combination with the existing formulas of bearing capacity calculation and probabilistic models of various resistance factors to obtain the detailed resistance probability model of concrete beams with different prestressed tendons and reinforced dispositions. On this basis, the analysis of the variation of design reliability of prestressed concrete beams with several parameters. The results show that the design reliability of prestressed concrete beam structures increases with the increase of prestressed tendons, so the reliability index of common concrete beams is only used to represent the reliability of prestressed concrete beams The reliability of stressed concrete beams will underestimate the deviation from the design goals.