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为了评估服役PC桥梁正常使用状态下全预应力构件及A类构件的应力状态,利用横张增量法对钢束有效预应力的统计规律进行了研究,结果表明:有效预应力统计参数服从正态分布且KEP～N(0.97,0.09)。在此基础上,利用可靠度方法构造了抗力(应力)概率模型、恒载效应概率模型、汽车及人群荷载效应概率模型,以应力失效准则为依据给出了最小可靠指标,从而建立了服役PC桥梁应力状态评估方法。
In order to evaluate the stress state of the PC prestressed members and the A type members under normal service, the statistic laws of the effective prestressing force of the steel strands are studied by the transverse increment method. The results show that the statistic parameters of the effective prestress obey the normal distribution And KEP ~ N (0.97, 0.09). On this basis, the probability model of the resistance (stress), the model of the dead load effect, the probability model of the load effect of the vehicle and the crowd are constructed by using the reliability method, and the minimum reliability index is given based on the stress failure criterion. Thus, a service PC Bridge stress state assessment method.