Download or read book Evaluation of Bridge Approach Settlement Mitigation Methods written by Sam Helwany and published by . This book was released on 2007 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bridge Approach Settlement Mitigation written by Joseph A. Boldt and published by . This book was released on 2002 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Overview of Mitigation Strategies for Settlements Under Bridge Approach Slabs written by Raja Veerendra Yenigalla and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Settlement and heave related movements of bridge approach slabs relative to bridge decks create a bump in the roadway causing inconvenience to the travelling public and at times so large as to make travelling unsafe. Hence, it is important to adopt suitable remedial methods to mitigate the approach settlements so as to ensure safe traveling conditions and also to decrease the repair/maintenance costs. This thesis presents an overview of a few case studies on different mitigation techniques applied on bridge approach settlement problems at various locations in the state of Texas. The methods employed to mitigate the settlement including Polyurethane injection, soil nailing, and potential utilization of Geofoam and flowable fill are discussed. Also, the development of design charts for the construction of light weight fill embankments using Expanded Clay and Shale (ECS) aggregate material is presented. Methods on how to use the design charts for various embankments are also covered.
Download or read book Recommendations for Design Construction and Maintenance of Bridge Approach Slabs written by Anand J. Puppala and published by . This book was released on 2012 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Settlement and heave related movements of bridge approach slabs relative to bridge decks create a bump in the roadway. Several problems arise from these bumps, which include poor riding conditions, potential vehicle damage, loss of vehicle control causing injuries or even casualities [i.e., casualties], lowered perception of the department's road works, increased maintenance works, and constant delays to rehabilitate the distressed lanes. All these make this bump problem a major maintenance problem in Texas. Several mitigation methods have been employed, and the results are not always satisfactory. In the present research, two treatment methods are investigated for controlling settlements of approach slabs of new bridge construction. Researchers from UTA and UTEP performed two phases to accomplish these studies. During the first phase, the documented information that covers various methods used so far for approach slab settlement mitigation technologies is compiled and presented. The second and final phase focused on field evaluation studies of deep soil mixing and light weight embankment fill treatment methods in reducing settlements. A few other technologies were also evaluated for reducing settlements of existing bridge approach slabs. Both design and construction specifications of the new methods that provided effective treatments in field conditions are presented.
Download or read book Performance Evaluation of Bridge Approaches written by and published by . This book was released on 1983 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Joint Participating Intermodal Surface Transportation Planning Research Work Program written by Wisconsin. Department of Transportation and published by . This book was released on 2001 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Causes of Bridge Approach Settlement and Development of Settlement Prediction Models written by Iqbal Uddin Mahmood and published by . This book was released on 1990 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book WisDOT Research Program written by and published by . This book was released on 2008 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wisconsin Transportation Research written by and published by . This book was released on 2000 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wisconsin Transportation Research 2000 written by Wisconsin. Department of Transportation and published by . This book was released on 2001 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Report to Stakeholders reviews some of our transportation research efforts in Wisconsin during the past four years. A few of these studies are already complete and have made a significant impact on the way we do business. Many of the projects will be finished in the coming months. For all of us interested in Wisconsin's transportation future, the report provides an overview of these diverse and laudable investigations.
Download or read book Management of Water and Backfill Characteristics for Improved Bridge Approach Performance written by Mohamed Magdi Mekkawy and published by . This book was released on 2004 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge approach settlement is a problem that draws upon resources for maintenance and repair, causes damage to vehicles, and creates a negative perception of the transportation agency. To alleviate bridge approach settlement, erosion and soil collapse must be reduced. This can be accomplished by improving water management around bridges and backfill characteristics. The purpose of this study was to examine the effects of improved water management and backfill properties on settlement of bridge approaches and to recommend new alternatives for design, construction, and maintenance of new and existing bridge approaches. Furthermore, recommend a threshold limit for approach slab settlement as a criterion to initiate maintenance. The objectives of this research are a literature review of relevant research of practices of other states, field inspection of existing and under construction bridges, monitoring of maintenance practices, laboratory experiments to analyze the properties of various backfill materials and geosynthetic drainage materials, and developing a new rating system as a criterion to initiate maintenance. To analyze the characteristics of backfill materials, the collapse index test was performed to measure the change in volume of the different backfill materials upon saturation at different moisture contents. Vibrating table tests (ASTM D4253-00) were performed, and a one-fourth scale model of a bridge approach was constructed in an effort to evaluate geosynthetic drainage materials as well as a variety of drainage details. This study reveals that poor water management is a major cause of bridge approach problems. Further, granular backfill materials placed within the bulking moisture content range are susceptible to collapse upon saturation. Proper compaction of granular backfill materials and placing porous backfill around subdrains is not being followed during construction. Grouting behind abutments and resurfacing of approach slabs do not necessarily prevent further settlements. The URETEK Inc. maintenance method appears to be a successful alternative to conventional maintenance practices; however, the long term performance is yet to be verified. The constructed model illustrated that using porous backfill, geocomposite vertical drain, and tire chips improved the bridge approach performance. The bridge Approach Index parameter and the IRI data were used as a new rating system.
Download or read book Identification of the Best Practices for Design Construction and Repair of Bridge Approaches written by David White and published by . This book was released on 2005 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge approach settlement and the formation of the bump is a common problem in Iowa that draws upon considerable resources for maintenance and creates a negative perception in the minds of transportation users. This research study was undertaken to investigate bridge approach problems and develop new concepts for design, construction, and maintenance that will reduce this costly problem. As a result of the research described in this report, the following changes are suggested for implementation on a pilot test basis: Use porous backfill behind the abutment and/or geocomposite drainage systems to improve drainage capacity and reduce erosion around the abutment; On a pilot basis, connect the approach slab to the bridge abutment, change the expansion joint at the bridge to a construction joint of 2 in., use a more effective joint sealing system at the CF joint, and change the abutment wall rebar from #5 to #7 for non-integral abutments; and For bridges with soft foundation or embankment soils, implement practices of better compaction, preloading, ground improvement, soil removal and replacement, or soil reinforcement that reduce time-dependent post construction settlements.
Download or read book Determination of Interaction Between Bridge Concrete Approach Slab and Embankment Settlement written by Chunsheng Cai and published by . This book was released on 2005 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this research is to correlate the deformation and internal force of the approach slab with the approach embankment settlements and the approach slab parameters such as length and thickness. Finite element analysis was carried out in the present study. This correlation will be used to evaluate the effectiveness of approach slabs and develop guidelines for their structural design. This information will also help determine when settlement controls are necessary. While flat approach slabs may be used for some short span applications, longer span lengths would require very thick slabs. In such cases, ribbed approach slabs (similar to slab-on-beam bridge decks) are proposed in the present study because they provide advantages over the flat slabs. Based on finite element analysis, internal forces and deformations of ribbed slabs were predicted and their designs were conducted. In addition, special studies on a few issues that were not included in the original scope of work were conducted. These special studies including investigating (1) the skew angle effects and the applicability of the developed methodology for right approach slabs to skewed approach slabs; (2) the failure mode/mechanism of the approach slab end and the abutment connection; (3) the applicability of the developed methodology to AASHTO LRFD highway loads; and (4) rating of the developed approach slabs in terms of special trucks.
Download or read book Bridge abutment and approach slab settlement written by and published by . This book was released on 1989 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is phase I of a research project conducted to identify, evaluate, and implement technologies which are related to improving bridge approach settling.
Download or read book Settlement Issues Bridge Approach Slabs final Report Phase 1 written by Lary R. Lenke and published by . This book was released on 2006 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The New Mexico Department of Transportation (NMDOT) Bridge Section in conjunction with various NMDOT district engineers have documented settlement issues with bridge approach slabs, i.e., the ubiquitous "bump at the end of the bridge," as a pressing maintenance, safety, construction and design issue. A literature review identifies geotechnical issues with the natural soil foundation and the embankments as the leading contributor to "the bump." A field evaluation of 19 New Mexico bridges suggest that most, if not all, bump problems in the state are associated with geotechnical issues. The lengths of approach slabs in New Mexico are deemed too short. Recommendations for dealing with "the bump" are thorough geotechnical analysis and engineering implementation of this analysis in the design and construction of the natural soil foundation and embankment materials. High quality QA/QC (quality assurance-quality control) is absolutely required. Lengthening of approach slabs is also recommended.
Download or read book Research Report written by A. M. Wolde-Tinsae and published by . This book was released on 1989 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approaches to bridges are designed to provide a smooth and safe transition from the highway pavement to the bridge deck and back to the highway pavement. Generally this transition area, regardless of pavement type, has been the cause of poor riding quality. Most problems occurring at bridge approaches can be associated with differential settlement between the highway pavement and bridge deck, rotation and/or lateral movement of the abutment, and poor design of structural components. This report compiles the different problems that have been encountered at approaches to bridges and summarizes corrective measures that have been used or recommended. Based on extensive finite element investigations, a comprehensive literature review, and a survey of state highway agencies, the report makes recommendations on approach slabs, drainage systems, approach embankments, and the use of geotextiles. Different approach slab lengths based on fill heights and assuming granular backfill material are recommended. Points regarding the special attention that must be given to controlling and driving water away from critical areas around abutments summarized. The use of marginal materials and/or inadequate compaction at approach recommendations on materials, compaction, and construction for approach embankments. The study reviewed the use of geotextiles, a technique that is promising, but requires further study to obtain more information on their in-place behavior.
Download or read book Factors Influencing Bridge Approach Settlement written by Kyriakos Efstratios Vavarapis and published by . This book was released on 1991 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
