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Post-Earthquake Damage Repair and Probabilistic Damage Control Approach for Reinforced Concrete Bridges.

机译：钢筋混凝土桥梁的震后损伤修复和概率损伤控制方法。

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摘要

The main objectives of the study were to develop post-earthquake repair methods using carbon fiber reinforced polymers (CFRP) and probabilistic damage control approach (PDCA) for reinforced concrete (RC) bridges. To develop repair methods, first repair objectives were defined. To define repair objectives, internal earthquake damage was quantified and correlated to a series of visible damage states (DSs). Bridge columns are designed to be the primary source of energy dissipation through nonlinear action under seismic loading and experience a wide range of apparent damage. Therefore, in the present study, DSs for bridge columns were used as a guide to define damage states for other bridge components.;The degree of damage in columns depends on the earthquake level (seismic demand). Due to uncertainties in seismic demand and response, damage to bridge columns is probabilistic in nature. In the present study, in addition to bridge repair, a probabilistic damage control approach PDCA was developed for new and repaired bridge columns by incorporating the extent of lateral displacement nonlinearity defined by "Damage Index" (DI) and reliability analysis. The performance objective was defined based on predefined apparent DSs and the DSs were correlated to damage indices based on a previous study at the University of Nevada, Reno. The correlation between DI and DS was determined from a statistical analysis (resistance model) of over 140 response data measured from testing of 22 bridge column models subjected to seismic loads.;To accomplish the objectives of this study, the present study was divided into seven parts. The first part was to conduct a detailed review of damage and repair methods in past earthquakes to identify gaps in repair methods. The second part was to develop practical methods to access the condition of an earthquake damaged bridge structural components in terms of apparent DS's. In the third part, repair design recommendations and design examples were developed to aid bridge engineers in quickly designing the number of CFRP layers based on the apparent DS. The fourth part was to establish a resistance model for the reliability analysis to develop a probabilistic based seismic design of bridge columns. In the fifth part, a load model was developed by conducting a large number of non-linear dynamic analyses on bridge bents. The uncertainties in ground motions, site class, bent configuration, earthquake return period were included in the analyses. In the sixth part of the study, the results of the reliability analyses were investigated, and a direct probabilistic design procedure was developed to calibrate design DI based on target reliability against failure. Finally, the PDCA methodology that was developed for conventional columns was used to extend the PDCA and reliability analysis approach to earthquake-damaged columns that have been repaired. Through this study, a new simple non-iterative method was developed for design of CFRP fabrics used in repair of concrete members. The step-by-step repair methods for bridge components that were developed as part of this study address a gap in rational and systematic repair tools that are needed subsequent to moderate and strong earthquakes. The PDCA that was developed and investigated provides design tools enabling designers and researchers to detail bridge columns for a target expected damage with an associated probability of occurrence and a reliability index.
机译：该研究的主要目的是开发针对碳纤维增强聚合物（CFRP）的地震后修复方法和针对钢筋混凝土（RC）桥梁的概率损伤控制方法（PDCA）。为了开发维修方法，首先确定了维修目标。为了定义修复目标，对内部地震破坏进行了量化，并将其与一系列可见破坏状态（DSs）相关联。桥梁柱被设计为在地震荷载作用下通过非线性作用耗散能量的主要来源，并且遭受了广泛的表观破坏。因此，在本研究中，桥梁柱的DS被用作定义其他桥梁构件的破坏状态的指南。柱的破坏程度取决于地震级别（地震需求）。由于地震需求和响应的不确定性，桥柱的损坏本质上是概率性的。在本研究中，除了桥梁修复外，还通过结合“损伤指数”（DI）定义的横向位移非线性程度和可靠性分析，为新的和修复的桥梁柱开发了概率损伤控制方法PDCA。该性能目标是基于预定义的表观DS定义的，并且DS是根据内华达大学里诺分校的先前研究与损伤指数相关的。 DI和DS之间的相关性是根据对22个桥梁柱模型在地震荷载作用下的测试所测量的140多个响应数据的统计分析（电阻模型）确定的。为了完成本研究的目的，本研究分为七个部分。第一部分是对过去地震中的破坏和修复方法进行详细审查，以找出修复方法中的空白。第二部分是根据表观DS，开发实用方法来访问地震破坏的桥梁结构构件的状况。在第三部分中，开发了维修设计建议和设计示例，以帮助桥梁工程师基于表观DS快速设计CFRP层数。第四部分是建立可靠度分析的抗力模型，以概率为基础进行桥梁柱的抗震设计。在第五部分中，通过对桥梁弯头进行大量非线性动力分析，建立了载荷模型。分析中包括地震动，场地类别，弯曲形态，地震复现期的不确定性。在研究的第六部分中，对可靠性分析的结果进行了研究，并开发了一种直接概率设计程序，以基于针对故障的目标可靠性来校准设计DI。最后，为常规柱子开发的PDCA方法被用于将PDCA和可靠性分析方法扩展到已修复的地震损坏柱子。通过这项研究，开发了一种新的简单的非迭代方法来设计用于修复混凝土构件的CFRP织物。作为本研究的一部分开发的桥梁构件分步修复方法解决了中度和强烈地震之后所需的合理和系统的修复工具中的空白。开发和研究的PDCA提供了设计工具，使设计人员和研究人员能够详细说明桥梁桥以达到目标预期损坏以及相关的发生概率和可靠性指标。

著录项

  • 作者

    Saini, Amarjeet.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Engineering Architectural.;Engineering Civil.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 422 p.
  • 总页数 422
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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