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Behavior of horizontally curved bridges under static load and dynamic load from earthquakes.

机译：水平弯曲的桥梁在静载荷和地震动载荷作用下的行为。

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摘要

This study is aimed at investigating the behavior of horizontally curved bridges subject to: (i) a static truck load; and (ii) a dynamic force arising from a horizontal earthquake applied in the transverse direction of the bridge. The study is conducted on single span bridges of 100 feet span length. The angle of horizontal curvature is changed between 20 to 40 degrees to obtain various configurations for the bridge geometry. The structure of each bridge consists of steel girders designed per AASHTO truck loads and an 8-inch deck slab at the top of the girders. The static analysis consists of two stationary AASHTO trucks located in such positions to generate the most severe loading condition for the bridge. The analysis for this load shows that the bending moment can be 36% more than that in a straight bridge. This value corresponds to a bridge with a horizontal curvature angle of 40 degrees and lateral bracing at L/15 intervals (L = span length). The amount of torsion generated for this loading condition can be, on the average, about 9% of the bending moment in a straight bridge.;The dynamic analysis consists of a seismic load based on the 1940 El-Centro Earthquake. The seismic load applies in the transverse direction. The amount of torsion generated in girders from seismic load can be as much as 27% of the bending moment in a straight bridge. The out-of-plane bending moments found to be about 25% of the in-plane bending moment in the longitudinal girders.;For bridge geometry, the span length of less than 100 feet is preferred for single span horizontally curved bridge. The recommendation for lateral bracing is to use them at L/30 to L/15 intervals. To properly consider the out-of-plane bending moment effect, a three-dimensional finite element must be used.;The following are the major conclusions of this study: (1) When subject to truck loads, curved bridges can develop a significantly higher bending moments in their girders than those in comparable straight bridges. (2) A non-uniform distribution of forces occur at the supports of a curved bridge. In particular an uplift may occur in some supports especially at higher curvature angles. (3) Under seismic loading, if adequate bracings are used, the in-plane bending moments in curved bridges are compatible with those in straight bridges. (4) A significant amount of torsional moment develops in girders of curved bridges under the stationary truck load and also under the application of the seismic loading. (Abstract shortened by UMI.)
机译：这项研究的目的是调查水平弯曲桥梁在下列情况下的行为： （ii）在桥梁的横向施加水平地震引起的动力。该研究在跨度为100英尺的单跨桥上进行。水平曲率角度在20到40度之间变化，以获得桥梁几何形状的各种配置。每座桥梁的结构均由根据AASHTO卡车载荷设计的钢制大梁和位于大梁顶部的8英寸甲板平板组成。静态分析由两辆固定的AASHTO卡车组成，它们位于这样的位置，以产生桥梁最恶劣的装载条件。对这种载荷的分析表明，弯矩比直桥的弯矩大36％。该值对应于一个水平曲率角为40度并且以L / 15间隔（L =跨度长度）横向支撑的桥。在这种载荷条件下产生的扭转量平均约为直桥弯矩的9％。动态分析包括基于1940年El-Centro地震的地震载荷。地震荷载沿横向施加。大梁在地震作用下产生的扭转量可能高达直桥中弯矩的27％。在纵向大梁中，平面外弯矩约为平面内弯矩的25％。对于桥梁几何形状，对于单跨度水平弯曲的桥梁，跨度长度最好小于100英尺。对于侧向支撑，建议以L / 30至L / 15的间隔使用它们。为了正确考虑平面外弯矩的影响，必须使用三维有限元。以下是本研究的主要结论：（1）当承受卡车载荷时，弯曲的桥梁会发展得更高。大梁的弯矩要比同类直桥的弯矩大。 （2）弯曲桥的支撑处出现力的不均匀分布。特别是在某些支座中尤其是在较高的曲率角处可能发生隆起。 （3）在地震荷载下，如果使用足够的支撑，则弯曲桥中的面内弯矩与直桥中的弯矩兼容。 （4）在卡车固定载荷和地震载荷作用下，弯曲桥梁的大梁会产生大量的扭转力矩。 （摘要由UMI缩短。）

著录项

  • 作者

    Odeh Al-Baijat, Hamadallah Mohammad.;

  • 作者单位

    Illinois Institute of Technology.;

  • 授予单位 Illinois Institute of Technology.;
  • 学科 Engineering Civil.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 124 p.
  • 总页数 124
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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