基于不同规范的连续梁桥确定性及可靠性对比分析

Contrastive Analysis on Determinacy and Reliability of Continuous Girder Bridge Based on Different Specifications

针对分别采用《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG 3362—2018、JTG D62—2004、JTJ 023—1985)设计的满堂支架现浇施工连续梁桥进行确定性和可靠性对比分析,通过有限元程序对成桥阶段选取的典型截面可靠指标进行计算。结果表明,确定性分析和可靠性分析结果有不同规律,不能单从确定性分析结果的大小来判断结构安全储备,需将确定性分析与可靠性分析相结合,才能对结构有合理准确的判断与评价。

This paper contrastively analyzes the determinacy and reliability of the full-framing cast-in-situ continuous girder bridges designed by Codes for Design of Highway Reinforced Concrete and Pre-stressed Concrete Culverts(JTG 3362-2018,JTG D62-2004 and JTJ 023-85),and calculates the reliable indexes of the typical section selected in the finished bridge stage through the finite element program.The results show that the analysis results of determinacy and reliability have different rules.It is not possible to judge the safety stock of structures from the size of deterministic analysis result.Only by combining the deterministic analysis with reliability analysis can the structures be reasonably and accurately judged and evaluated.