摘要
由于受海域自然环境、使用条件和内部材料等因素的影响,高桩码头构件易产生钢筋锈蚀、混凝土劣化、钢筋与混凝土间粘结力降低等现象,会使钢筋混凝土构件的抗力随时间不断降低,作用荷载随时间也不断发生变化。本研究将钢筋混凝土构件的抗力和作用荷载均视为随机过程,将其转化为设计使用期内年极值的随机变量,采用JC方法计算结构物的可靠度指标,建立考虑钢筋混凝土构件时变特性的高桩码头结构的全寿命可靠度分析方法,并通过算例说明如何运用该方法计算随时间变化的结构物可靠度,可为钢筋混凝土结构全寿命可靠度设计理论的发展和应用提供参考。
Since piled wharf structural members are influenced by sea area natural environment,its＇ application condition and intrinsic material,some things always happen such as rebar corrosion,concrete degradation and the reduction of binding power between rebar and concrete.Then the resistance of reinforced concrete structural members decreases with time.In addition,the applied load varies with time.In the research,the resistance of RC members and the applied load are considered as random processes and transformed into random variables for annual extreme values in design period.JC method is adopted to calculate the reliability index of structures.Full life reliability analyzing method is established for piled wharf structure while considering RC members time-varying characteristic.Through an calculation example,it is shown that the above method is applied to calculate the structure reliability which varies with time.The research will provide the reference for the development and application of RC structure full life reliability design theory.
出处
《港工技术》
2011年第5期21-25,共5页
Port Engineering Technology
基金
国家自然科学基金(50979069)
天津市科技支撑计划重点项目(10JCYBJC03400)
