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首页> 外文期刊>Journal of structural engineering >Time-Variant Flexural Reliability of Posttensioned, Segmental Concrete Bridges Exposed to Corrosive Environments
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Time-Variant Flexural Reliability of Posttensioned, Segmental Concrete Bridges Exposed to Corrosive Environments

机译：暴露于腐蚀性环境中的后张，分段​​混凝土桥梁的时变弯曲可靠性

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摘要

Posttensioned (FT) bridges are used on major thoroughfares because they are economical structures for traversing long spans. Special inspections of these bridges have revealed corrosion of the strands at void locations in the tendons. The integrity of these strands has significant influence on the safety of these bridges. Inspections indicate that many ducts (parts of the tendon that is supposed to protect strands from exposure to aggressive environments) are cracked and many grout holes and vents are opened, allowing direct ingress of moisture and chlorides. This paper presents a framework for assessing the flexural reliability of PT bridges exposed to various environmental conditions. The moment capacity of a PT girder is formulated using probabilistic models for the tension capacity of corroding PT strands exposed to various void and environmental conditions. Using Monte Carlo simulations, the flexural reliability of an example PT bridge is assessed. The research indicates that the flexural reliability index reaches a value below the recommended value within a relatively short period of time when moisture and chlorides infiltrate the tendons. These findings emphasize the critical need for new inspection, assessment, and repair methods for these bridge types.
机译：后张（FT）桥用于主要通道，因为它们是穿越大跨度的经济结构。对这些桥梁的特殊检查显示，钢绞线中空位处的钢绞线受到腐蚀。这些钢绞线的完整性对这些桥的安全性有重要影响。检查表明，许多导管（应该用来保护股线免受侵蚀的肌腱的部分）破裂，并打开了许多灌浆孔和排气孔，从而使水分和氯化物直接进入。本文提出了一种评估暴露于各种环境条件下的PT桥梁抗弯可靠性的框架。 PT梁的弯矩承载力是使用概率模型针对暴露于各种空隙和环境条件下的腐蚀PT股的抗拉能力制定的。使用蒙特卡洛模拟，评估示例PT桥的抗弯可靠性。研究表明，当水分和氯化物渗入肌腱时，弯曲可靠性指标在相对较短的时间内达到低于推荐值的值。这些发现强调了针对这些桥梁类型的新检查，评估和维修方法的迫切需求。

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