3-D Computer Modeling of Subsurface Conditions for Bridge Foundations PDF Download
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Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 74
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Book Description
A study was conducted to evaluate the potential for using three-dimensional (3-D) computer modeling to assist Missouri Department of Transportation Soils and Geology personnel and Bridge Division personnel in developing accurate and realistic understanding of subsurface conditions for bridge structures. Secondary objectives of the study included developing a preliminary procedure for development of 3-D geologic models of bridge sites and identifying key issues to be addressed for more widespread use of 3-D modeling activities. The site of a proposed new bridge across the Missouri River near Lexington, Missouri was selected as a demonstration case study for 3-D geologic modeling. Several separate models of this site were developed during the project to demonstrate the different levels of abstraction for a 3-D model of a particular site. The computer models developed are presented and described in this report.
Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 74
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Book Description
A study was conducted to evaluate the potential for using three-dimensional (3-D) computer modeling to assist Missouri Department of Transportation Soils and Geology personnel and Bridge Division personnel in developing accurate and realistic understanding of subsurface conditions for bridge structures. Secondary objectives of the study included developing a preliminary procedure for development of 3-D geologic models of bridge sites and identifying key issues to be addressed for more widespread use of 3-D modeling activities. The site of a proposed new bridge across the Missouri River near Lexington, Missouri was selected as a demonstration case study for 3-D geologic modeling. Several separate models of this site were developed during the project to demonstrate the different levels of abstraction for a 3-D model of a particular site. The computer models developed are presented and described in this report.
Author: Ignatius Po Lam
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 126
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This report documents practical modeling procedures adopted in the bridge engineering community involving seismic dsigns and retrofits of long span bridges relative to treatment of wave propagation problems. It also discusses wave scattering issues arising from irregular foundation boundaries affecting seismic loading of the bridges, which is not explicitly considered in th current design practice. Wave scattering is generally implemented in the nuclear power plant industry for seismic designs of various containment systems often using frequency domain computer programs. To examine the subject of wave scattering for application to long span bridge foundations, systematic modeling is exercised using a time domain based computer program and verification is made against a frequency domain computer program. For present day seismic designs of major bridges, nonlinear time history analysis is a common procedure to examine seismic loading of the structure permitting plastic hinging and ductility to be implemented. Thus, the current trend is to adopt time domain based computer programs for performing wave scattering analyses which can also serve as a common platform to be used by both geotechnical and structural engineers for the global bridge model. A major benefit is to minimize the amount of work for data transfer and potential error arising from two different groups (geotechnical and structural engineers) working on different computer codes requiring different input/output. By using the same computer code by both geotechnical and structural engineers, many problems are eliminated. Typically, wave scattering analyses are conducted in the frequency domain. This report presents studies of wave scattering using a time domain computer program. The same computer program can be used by structural engineers to proceed with coding the superstructure model, directly using the results from the wave scatterings analysis. The report presents various sensitivity analyses in order to minimize wave reflection and refraction at the model's side boundaries. Numerical integration schemes and implementation of Rayleigh parameters are discussed. Careful examination of waves traveling the bottom boundary allows proper modeling of the half-space below the region of interest. The studies explore the effects from wave scattering on large pile groups and soft ground conditions, and findings on the frequency ranges where significant scattering is observed are reported. Large caissons are know to affect seismic wave scattering due to the large wave length implied by the dimensions of the foundation embedded in soil. Parametric studies are performed to examine the shaking level that is altered by the wave scattering mechanism. From the current findings, it appears that the wave scattering tends to reduce the shaking level, especially in the high frequency range, and hence is beneficial to the bridge design
Author:
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Category :
Languages : en
Pages : 88
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Author:
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ISBN:
Category : Highway engineering
Languages : en
Pages : 100
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Author: A. J. Lutenegger
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ISBN:
Category : Technology & Engineering
Languages : en
Pages : 592
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Book Description
GSP 94 contains 37 papers presented at a Specialty Conference on Performance Confirmation of Constructed Geotechnical Facilities, held in Amherst, Massachusetts, April 9-12, 2000.
Author:
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ISBN:
Category : Hydrology
Languages : en
Pages : 952
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Author: Robert E. Kimmerling
Publisher:
ISBN: 9781466246645
Category :
Languages : en
Pages : 296
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This document is the sixth in a series of Geotechnical Engineering Circulars (GEC) developed by the Federal Highway Administration (FHWA). This Circular focuses on the design, procurement and construction of shallow foundations for highway structures. The intended users are practicing geotechnical, foundation and structural engineers involved with the design and construction of transportation facilities.
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ISBN:
Category : Water
Languages : en
Pages : 466
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Author: U. S. Department of Transportation
Publisher:
ISBN: 9781329651029
Category : Reference
Languages : en
Pages : 0
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The purpose of this document is to identify and provide design guidelines for bridge scour and stream instability countermeasures that have been implemented by various State departments of transportation (DOTs) in the United States. Countermeasure experience, selection, and design guidance are consolidated from other FHWA publications in this document to support a comprehensive analysis of scour and stream instability problems and provide a range of solutions to those problems. The results of recently completed National Cooperative Highway Research Program (NCHRP) projects are incorporated in the design guidance, including: countermeasures to protect bridge piers and abutments from scour; riprap design criteria, specifications, and quality control, and environmentally sensitive channel and bank protection measures. Selected innovative countermeasure concepts and guidance derived from practice outside the United States are introduced. In addition, guidance for the preparation of Plans of Action ...
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Category : Solar energy
Languages : en
Pages : 450
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