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Development of load and resistance factor design for FRP strengthening of reinforced concrete structures.

机译：钢筋混凝土结构FRP加固的荷载和阻力系数设计的开发。

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摘要

Externally bonded fiber reinforced polymer (FRP) composites are an increasingly adopted technology for the renewal of existing concrete structures. In order to encourage the further use of these materials, a design code is needed that considers the inherent material variability of the composite, as well as the variations introduced during field manufacture and environmental exposure while in service. Load and Resistance Factor Design (LRFD) is a reliability-based design methodology that provides an ideal framework for these considerations and is compatible with existing trends in civil engineering design codes. This dissertation studies the application of LRFD to FRP strengthening schemes with an emphasis on wet layup, carbon fiber composites applied to reinforced concrete T-beam bridge girders.; Models to describe variation in the existing structural materials and the structural loading are drawn from the literature. Techniques for reliability analysis are discussed, and existing work on externally bonded FRP reliability is surveyed.; Stochastic variation in the FRP is characterized based on tensile testing of several sets of field-manufactured, wet layup composites. A general design procedure applicable to many different situations is proposed using a composite specific resistance factor to consider material variability, a set of Application Factors to account for deviations introduced through field manufacture, and an environment and service-life specific factor for FRP degradation.; Preliminary resistance factors for design of FRP strengthening are calibrated over a range of design scenarios. FRP degradation is considered based on existing durability models, and continued degradation of the structure due to general corrosion of the reinforcing steel is included. The girders used for calibration are selected as representative examples from a sample of California bridge plans. The reliability has been evaluated using simulation and first-order reliability methods. An example of the proposed design procedure, using the calibrated resistance factors, is provided.; The results of this work bring to light the many variables affecting the reliability of strengthened members and the need for continuing research to better describe these variables. Two variables of particular significance, requiring extensive further study, are the state of the existing structure when strengthening is applied and the loads acting on the structure.
机译：外部粘结的纤维增强聚合物（FRP）复合材料是用于更新现有混凝土结构的一种越来越被采用的技术。为了鼓励进一步使用这些材料，需要一个设计规范，其中要考虑到复合材料固有的材料变异性，以及在现场制造过程中以及使用中暴露于环境中所引起的变异。载荷和阻力因子设计（LRFD）是一种基于可靠性的设计方法，可为这些考虑因素提供理想的框架，并与土木工程设计规范中的现有趋势兼容。本文研究了LRFD在FRP加固方案中的应用，重点研究了湿铺法，碳纤维复合材料在钢筋混凝土T型梁桥梁上的应用。从文献中得出描述现有结构材料的变化和结构载荷的模型。讨论了可靠性分析技术，并调查了有关外部粘合FRP可靠性的现有工作。 FRP的随机变化是基于对几套现场制造的湿法铺层复合材料的拉伸试验得出的。提出了一种适用于许多不同情况的通用设计程序，该方法使用复合电阻率系数来考虑材料的可变性，一组应用系数以解决由于现场制造而引入的偏差以及环境和使用寿命特定的FRP降解系数。在一系列设计方案中，对用于FRP加固设计的初步阻力因素进行了校准。根据现有的耐久性模型来考虑FRP的退化，并且包括由于钢筋的全面腐蚀而导致的结构的持续退化。从加利福尼亚桥梁计划的样本中选择用于校准的大梁作为代表性示例。使用仿真和一阶可靠性方法评估了可靠性。提供了使用校准电阻系数的拟议设计程序的示例。这项工作的结果揭示了许多影响加强构件可靠性的变量，并需要进行继续研究以更好地描述这些变量。有两个特别重要的变量需要进一步研究，一个是应用加固时现有结构的状态，另一个是作用在结构上的载荷。

著录项

  • 作者

    Atadero, Rebecca Anne.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 421 p.
  • 总页数 421
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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