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Structural modeling of the Indian River Inlet Bridge under current and potential scour conditions.

机译：在当前和潜在冲刷条件下的印度河进口桥梁的结构模型。

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摘要

The Indian River Inlet Bridge is located along the coast of southern Delaware, and provides an important connection to some of Delaware's most popular tourist areas. The bridge is a five-span steel girder structure crossing almost 1,000 ft of water. Strong tidal flows at the inlet have caused significant scour holes to form on both sides of the in-water piers in the direction of flow. The scour has become so severe that the Delaware Department of Transportation (DelDOT) has recognized a need for and installed a monitoring system to help monitor the stability of the bridge. The monitoring system consists of tilt sensors placed at the top of each of the in-water piers to monitor any movements that may occur as a result of the scour. This data is used in the current study to assess the current structural health and stability of the bridge.This thesis describes the steps taken to identify the potential effects of the scour on the strength of the bridge and the development of structural analysis tools that may be used to predict bridge performance based on current and future monitoring data. To accomplish these goals, background information is first provided on Indian River Inlet Bridge and the issue of scour. Second, details on the tilt sensors and data collected at the bridge are described. Third, an analysis of the bridge substructure is detailed including a pile capacity analysis for the piers and a pushover capacity analysis of the pier under lateral loads. Fourth, a finite element model of the superstructure is presented to determine how movement of the piers may affect the stress levels in the girders and deck. Finally, conclusions are made on the current and future strength and stability of the bridge in its present state and if the scour should increase. From this analysis it is predicted that the current magnitude of lateral movement of the piers is not likely to cause structural instability of the bridge. A discussion of potential effects should the scour conditions exacerbate is also included.
机译：印度河入口大桥位于特拉华州南部沿海，是通往特拉华州最受欢迎的旅游区的重要通道。这座桥是一个五跨钢梁结构，横跨近1,000英尺的水。入口处的强潮汐流已导致在水墩的两侧沿水流方向形成大量的冲刷孔。冲刷变得如此严峻，以至于特拉华州交通运输部（DelDOT）已经意识到需要并安装了一个监视系统来帮助监视桥梁的稳定性。监视系统由放置在每个水下码头顶部的倾斜传感器组成，以监视冲刷可能发生的任何运动。该数据被用于当前的研究中，以评估桥梁的当前结构健康和稳定性。本文介绍了确定冲刷对桥梁强度的潜在影响以及开发结构分析工具所采取的步骤。用于根据当前和将来的监视数据预测桥梁性能。为了实现这些目标，首先要提供有关印度河入口大桥和冲刷问题的背景信息。其次，描述倾斜传感器的细节和在桥梁处收集的数据。第三，详细分析了桥梁的下部结构，包括对墩的桩容量分析和对侧向荷载作用下的墩的推覆能力分析。第四，提出了上部结构的有限元模型，以确定墩的运动如何影响大梁和桥面的应力水平。最后，得出关于目前和将来桥梁的强度和稳定性以及冲刷是否应该增加的结论。根据该分析，可以预测当前墩的横向运动幅度不可能引起桥梁结构的不稳定性。还包括对冲刷条件恶化的潜在影响的讨论。

著录项

  • 作者

    Cann, Michael.;

  • 作者单位

    University of Delaware.;

  • 授予单位 University of Delaware.;
  • 学科 Engineering Civil.
  • 学位 M.C.E.
  • 年度 2009
  • 页码 182 p.
  • 总页数 182
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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