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由于跨海桥梁的环境效应有别于一般桥梁,正常使用极限状态所对应的目标可靠度也必然不同,因此,基于JCSS模式规范建议了目标可靠度指标分别为1.5,2.0和2.3的跨海桥梁基础结构正常使用极限状态三级可靠度水平,并提出了一种可变荷载系数的标定新方法,即通过各类荷载引起的钢筋拉应力对于混凝土裂缝宽度的贡献率不同建立基于钢筋拉应力的正常使用极限状态方程.最后,依据可靠度计算的校准法,结合具体工程进行了基于目标可靠度的可变荷载频遇值系数和准永久值系数的标定,通过设计实践证明所建议的目标可靠度指标值是合理的,采用的标定新方法是可行的.
Because the environmental effects of the bridge across the sea are different from those of normal bridges, the target reliability corresponding to the limit state of normal use will inevitably be different. Therefore, based on the JCSS model specification, the cross-sea bridges with target reliability indicators of 1.5, 2.0 and 2.3 The basic structure normally uses the third-level reliability level of limit state and proposes a new calibration method of variable load coefficient, that is, the contribution rate of tensile stress to the crack width of concrete caused by various loads is different. Based on the tensile stress The limit state equation is normally used.Finally, based on the calibration method of reliability calculation, the calibration of variable load frequency exponential value and quasi-permanent value coefficient based on the target reliability is carried out according to the specific project, and the proposed target is proved to be reliable by design practice Degree index value is reasonable, the calibration of the new method is feasible.