海洋环境下钢筋混凝土构件抗力随时间变化模型研究

考虑混凝土强度变化、钢筋锈蚀过程、混凝土碳化和钢筋锈蚀引起的混凝土与钢筋之间粘结能力的改变等因素，建立了高桩码头钢筋混凝土构件抗力随时间变化的随机过程模型。通过算例研究了混凝土碳化、氯离子侵蚀、混凝土强度、构件所处水位等对高桩码头钢筋混凝土构件抗力的影响。并提出海洋环境条件和使用荷载作用下钢筋混凝土构件的累积损伤、裂缝宽度计算方法、裂缝宽度对氯离子侵蚀速度的影响、以及钢筋混凝土码头健康状态诊断方法等。

On Time-dependent Resistance of RC Members in Marine Environment

Considering the time histories of concrete strength variation, the time histories of reinforcing bar corrosion, concrete carbonation and the reduction of binding capacity between concrete and reinforcing bar induced by reinforcing bar corrosion etc. , a time-dependent resistance model of reinforced concrete members in marine environment is presented in this paper. The effects of concrete carbonation, chloride ion ingress ,concrete strength variation, and reinforcing bar strength variation on the time-dependent resistance of reinforced concrete members are investigated through an example. It is proposed that the calcu- lation methods for the cumulative damage and crack width of reinforced concrete members, the effects of crack width on chloride ion corrosion velocity in marine environment, as well as the diagnostic techniques of health state and the design theory for the whole life cycles of reinforced concrete wharves are the problems to be solved for further study.