考虑荷载作用下抗力时变特性的沿海钢筋混凝土结构可靠度分析

针对海洋环境下钢筋混凝土结构破坏影响因素复杂的特点,建立了荷载作用下的氯离子侵蚀模型和钢筋锈蚀率模型;将钢筋混凝土构件的抗力和作用荷载均视为随机过程,并离散为设计基准期内服从某种分布的随机变量,通过改进的一次二阶矩法计算结构的可靠度指标,建立了荷载作用下考虑构件抗力时变特性的海洋环境下钢筋混凝土结构可靠度分析方法。通过高桩码头的算例说明了该方法的可行性,研究了荷载作用对结构耐久性和承载力寿命的影响。

Analysis on reliability of reinforced concrete structures in marine environment considering resistance time-varying characteristic

In this paper,considered the complexity of the influence factors on damage of steel concrete structure under the marine environment,a Chloride ions erosion model and a steel erosion model were set up.The resistance of RC members and the applied load were considered as random processes and transformed into random variables for annual extreme values in design periods.JC method was adopted to calculate the reliability index of structure.The reliability analyzing method which considering RC members time-varying characteristic under loads was established for reinforced concrete structures in marine environment.A piled wharf example were calculated to show how to calculate the structural reliability considered the effect of loads,and to make comparisons considered the effect of the loads or not considered.