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An integral precast approach slab to bridge connection.

机译:一体式预制板可桥接连接。

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摘要

The Iowa Department of Transportation has long recognized that approach slab pavements of integral abutment bridges are prone to settlement and cracking, which manifests itself as the "bump at the end of the bridge". The bump is not a significant safety problem; rather it is an expensive maintenance issue. A commonly recommended solution is to integrally attach the approach slab to the bridge abutment, which moves the expansion joint typically found at the approach slab/abutment interface to a location further from the bridge where soil settlement is less of a concern and maintenance is easier. For existing structures the typical maintenance activities, such as adding wedges of asphalt to reduce the bump, are temporary fixes and do not address the underlying problem until the only remaining alternative is replacement of the approach slab. Finding ways rapidly make repairs, and thus decreasing the effects on traffic is critical. One promising solution for reducing construction durations, which the Iowa Department of Transportation has been testing and evaluating, is the use of precast concrete pavement and bridge elements.;For this study, two different approach slabs, one being precast concrete and the other being cast-in-place concrete, were integrally connected to twin parallel bridges on Iowa Highway 60. The primary objectives of this investigation were to evaluate: the viability of precast approach slabs, the approach slab performance, and the impacts the approach slabs have on the bridge.;The Iowa State University Bridge Engineering Center installed a monitoring system on both bridges and the approach slab systems. Several behavior facets were studied and monitored during the evaluation period including abutment movement, bridge girder strain changes, approach slab strain changes, approach slab joint displacements, post-tensioning strain, and abutment pile strain changes. The project scope also involved a literature review, a survey of Midwest Department of Transportation current practices, onsite observation of the fabrication and installation of the precast approach slab panels, and periodic visual inspection of the bridges.;From the onsite observations and the year-long monitoring the following general conclusions were made: (1) the integral connection appears to function well with no observed distress or relative movement of the approach slab and bridge; (2) the approach slab to the bridge connection appears to impact the bridge to a minor degree; (3) the two different approach slabs appear to impact the bridge differently; (4) the measured strains in the approach slabs indicate a force exists at the expansion joint which should be taken into consideration during the design stage; (5) the observed responses generally followed an annual cycle with shorter term cyclic patterns; (6) metal forms should be used to ensure a quality precast product; (7) larger access pockets should be used; and (8) finer granular material would allow easier and more precise adjustments of the panels.
机译:爱荷华州交通部早就认识到,整体式桥台的进阶平板路面易于沉降和开裂,这表现为“桥头的凹凸”。颠簸不是一个重大的安全问题。而是一个昂贵的维护问题。通常推荐的解决方案是将引路板整体连接到桥台,这会将通常在引路板/桥台接口处找到的伸缩缝移动到距桥较远的位置,在此位置土壤沉降较少,维护也更容易。对于现有结构,典型的维护活动(例如添加沥青楔形物以减少颠簸)只是暂时性的解决方法,因此无法解决潜在的问题,直到唯一剩下的替代方法是更换进路平板。快速找到方法进行维修,从而减少对交通的影响至关重要。爱荷华州运输部一直在测试和评估的一种减少施工工期的有前途的解决方案是使用预制混凝土路面和桥梁构件。在本研究中,两种不同的进路平板,一种是预制混凝土,另一种是浇铸现浇混凝土与爱荷华州高速公路60上的双平行桥整体相连。本研究的主要目的是评估:预制进近平板的可行性,进出平板的性能以及进出平板对桥梁的影响爱荷华州立大学桥梁工程中心在桥梁和进场平板系统上均安装了监控系统。在评估期间,研究和监测了多个行为方面,包括桥台移动,桥梁大梁应变变化,进近平板应变变化,进近平板接头位移,后张应变和基台桩应变变化。该项目的范围还包括文献综述,对中西部运输部当前做法的调查,对预制引路面板的制造和安装的现场观察以及对桥梁的定期目视检查。长期监测得出以下一般结论:(1)整体连接似乎运行良好,并且没有观察到遇险或进近平板和桥梁的相对运动; (2)通往桥面连接处的引桥板对桥的影响较小。 (3)两种不同的进路平板对桥梁的影响似乎不同; (4)引伸板中测得的应变表明伸缩缝处存在力,在设计阶段应予以考虑; (5)观察到的响应通常遵循短期周期模式的年度周期; (6)应使用金属模板以确保预制产品的质量; (7)应使用较大的进入口袋; (8)较细的粒状材料将使面板的调整更加容易和精确。

著录项

  • 作者

    Faris, Adam S.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2009
  • 页码 62 p.
  • 总页数 62
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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