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首页> 外文学位 >Strengthening existing steel bridge girders by the use of post-installed shear connectors.
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Strengthening existing steel bridge girders by the use of post-installed shear connectors.

机译：通过使用后安装的剪切连接器来加强现有的钢桥梁。

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摘要

A number of older bridges built before the 1970's were constructed with floor systems consisting of a non-composite concrete slab over steel girders. Many of these bridges do not satisfy current load requirements and may require replacement or strengthening. A potentially economical means of strengthening these floor systems is to connect the existing concrete slab and steel girders to permit the development of composite action. This dissertation describes a research program investigating methods to develop composite action in existing non-composite floor systems by the use of post-installed shear connectors.;Three types of post-installed shear connection methods were investigated. These methods are referred to as the double-nut bolt, the high tension friction grip bolt, and the adhesive anchor. These post-installed shear connectors were tested under static and fatigue loading, and design equations for ultimate strength and fatigue strength were developed. These post-installed shear connectors showed significantly higher fatigue strength than conventional welded shear studs widely used for new construction. The superior fatigue strength of these post-installed shear connectors enables strengthening of existing bridge girders using partial composite design, thereby requiring significantly fewer shear connectors than possible with conventional welded shear studs.;Five full-scale non-composite beams were constructed and four of these were retrofitted with post-installed shear connectors and tested under static load. The retrofitted composite beams were designed as partially composite with a 30-percent shear connection ratio. A non-composite beam was also tested as a baseline specimen. Test results of the full-scale composite beams showed that the strength and stiffness of existing non-composite bridge girders can be increased significantly. Further, excellent ductility of the strengthened partially composite girders was achieved by placing the post-installed shear connectors near zero moment regions to reduce slip at the steel-concrete interface.;Parametric studies using the finite element program ABAQUS were also conducted to investigate the effects of beam depth, span length, and shear connection ratio on the system behavior of strengthened partially composite beams. The studies showed that current simplified design approaches commonly used for partially composite beams in buildings provide good predictions of the strength and stiffness of partially composite bridge girders constructed using post-installed shear connectors.
机译：在1970年代之前建造的许多较旧的桥梁，其地板系统由钢梁上的非复合混凝土板组成。这些桥中有许多不满足当前的负载要求，可能需要更换或加固。加强这些地板系统的一种潜在的经济方法是将现有的混凝土板和钢梁连接起来，以发展复合作用。本论文描述了一种研究程序，研究通过使用后安装的剪切连接器在现有的非复合地板系统中开发复合作用的方法。；研究了三种类型的后安装的剪切连接方法。这些方法称为双螺母螺栓，高张力摩擦夹紧螺栓和粘合剂锚。这些安装后的剪切连接器在静态和疲劳载荷下进行了测试，并开发了极限强度和疲劳强度的设计方程式。这些安装后的剪力连接器比广泛用于新建筑的传统焊接剪力柱具有更高的疲劳强度。这些后安装的剪力连接器具有超强的疲劳强度，可以使用部分复合设计来加固现有的桥梁梁，因此与传统的焊接剪力柱相比，所需的剪力连接器要少得多。建造了五个全尺寸非复合梁，其中四个这些都用后安装的剪切连接器进行了改装，并在静载荷下进行了测试。改造后的复合梁设计为30％剪切连接率的部分复合梁。还测试了非复合梁作为基准试样。全尺寸组合梁的测试结果表明，现有的非复合桥梁的强度和刚度可以显着提高。此外，通过将安装后的剪力连接器放置在零弯矩区域附近以减少钢混凝土界面的滑移，从而获得了增强的部分组合大梁的出色延展性;还使用有限元程序ABAQUS进行了参数研究，以研究其影响。深度，跨度长度和剪力连接比对加固的部分组合梁的系统性能的影响。研究表明，当前用于建筑物中部分组合梁的简化设计方法可以很好地预测使用后安装剪力连接器构建的部分组合桥梁的强度和刚度。

著录项

  • 作者

    Kwon, Gun Up.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 261 p.
  • 总页数 261
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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