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恒载性超载对在役桥梁受弯构件可靠性的影响规律

, PP. 77-81

Keywords: 桥梁工程,在役桥梁安全性,可靠性指标,受弯构件,超载

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Abstract:

为深入研究恒载性超载对在役桥梁安全性的影响程度,以加固后桥梁名义恒载效应与原名义恒载效应之比作为恒载超载系数,详细分析了在役桥梁受弯构件可靠指标随恒载超载程度的变化规律。鉴于新老桥梁设计规范极限状态设计表达式的不同,采用《公路工程可靠度设计统一标准》建议的抗力与荷载效应的统计参数,分别计算了与不同恒载超载系数对应的受弯构件可靠指标。计算结果表明,随着恒载标准值效应所占比重的增加,恒载性超载对桥梁结构安全性的影响愈明显。桥梁结构或构件隐含的可靠度越高,相应结构或构件的抗恒载性超载能力越强。在满足目标可靠指标要求的前提下,结构或构件容许一定程度的超载作用。

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