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为确保大件运输过程中欲通行的桥梁具有足够的承载力,在简要介绍大件运输之后,对桥梁结构技术状况等级评定的具体办法进行了讨论;基于可靠度理论,分析了大件运输在实际情况中,桥梁技术状况等级对大件运输承载能力的影响;修正了不同结构安全等级下,脆性破坏与延性破坏结构的目标可靠度指标;基于在役桥梁承载能力极限状态与一次二阶矩验算点法,在分析桥梁结构可靠度的基础上,对大件运输荷载分项系数进行了取值。结果表明,桥梁技术状况评定等级的不同会直接影响其验算承载能力;大件运输过程中,宜将桥梁的可靠度指标在规范要求基础上,偏安全地降低0.25;大件车荷载分项系数取值宜根据桥梁技术状况等级由高到低分别取值为1.0,1.06,1.12。
In order to ensure the sufficient capacity of the bridges to be transported in the process of bulky transportation, the method of assessing the technical status of the bridge structure is discussed after a brief introduction of the bulky transportation. Based on the reliability theory, In the actual situation, the influence of technical grade of bridge on the carrying capacity of large-size transport; ameliorated the target reliability index of brittle failure and ductile failure structures under different structural safety levels; based on the limit state of bearing capacity of bridge in service and the first second moment Based on the analysis of the reliability of bridge structure, the partial factor of large-scale transportation load is taken as the check point method. The results show that the different grades of bridge technical status will directly affect the checking capacity. During the large-size transportation, the reliability index of the bridge should be reduced by 0.25 on the basis of the standard requirements; The value should be based on the technical level of the bridge from high to low values were 1.0,1.06,1.12.