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Time-variant service reliability of post-tensioned, segmental, concrete bridges exposed to corrosive environments

机译:暴露于腐蚀性环境中的后张,分段​​混凝土桥梁的时变服务可靠性

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This paper presents a framework for assessing the service reliability of post-tensioned (PT) bridges with damaged and undamaged tendons containing voids, chlorides, and moisture. The service reliability is defined based on the probability that the normal stress due to the applied loads (i.e., demand) at the midspan of the girder attains or exceeds the corresponding allowable normal stress (i.e., capacity). The probabilistic model to determine the normal stress demand is formulated using statistical characteristics of highway traffic and bridge design loads, probabilistic models for the tension capacity of corroding strands, the AASHTO LRFD stress model for strands, and Todeschini's nonlinear stress model for concrete. The probabilistic model for capacity is based on the AASHTO LRFD normal stress limits. Using the developed reliability framework and Monte Carlo simulation, the time-variant service reliability of a typical PT bridge over a 75-year period is estimated. After chloride and moisture infiltrate the tendons, the service reliability reduces to a value below recommended values within a relatively short period of time.
机译:本文提出了一个框架,用于评估带有已损坏和未损坏的包含空隙,氯化物和水分的钢筋束的后张式(PT)桥梁的服务可靠性。服务可靠性的定义是基于在梁的中跨处由于施加的载荷(即需求)引起的法向应力达到或超过相应的允许法向应力(即承载力)的概率。使用公路交通和桥梁设计荷载的统计​​特性,腐蚀钢绞线的抗拉能力的概率模型,钢绞线的AASHTO LRFD应力模型以及Todeschini的混凝土非线性应力模型,可以确定确定正常应力需求的概率模型。容量的概率模型基于AASHTO LRFD法向应力极限。使用开发的可靠性框架和蒙特卡洛模拟,可以估算出典型PT桥在75年内的时变服务可靠性。在氯化物和水分渗入肌腱后,使用寿命会在相对较短的时间内降低到低于建议值的值。

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