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Highway bridge seismic design:summary of FHWA/MCEER project on seismic vulnerability of new highway construction

Earthquake Engineering and Engineering Vibration 2002年第1期1卷 10-19页

作者： Ian M.Friedland Ian G.Buckle George C.Lee Applied Technology Council 1300 Pennsylvania Ave NWSuite 700Washington D.C.20004USA Associate Director for Development Department of Civil Engineering University of Nevada-RenoMail Stop 258RenoNevada89557USA Professor Multidisciplinary Center for Earthquake Engineering Research.University at Buffalo.Red Jacket Quadrangle.Buffalo.New York 14260.USA Samuel P.Capen Professor

The Federal Highway Administration (FHWA) sponsored a large,multi-year project conducted by the Multidisciplinary Center for Earthquake Engineering Research (MCEER) titled'Seismic Vulnerability of New Highway Construction'(MCEER Project 112),which was completed in *** coordinated the work of many researchers,who performed studies on the seismic design and vulnerability analysis of highway bridges,tunnels,and retaining structures. Extensive research was conducted to provide revisions and improvements to current design and detailing approaches and national design specifications for highway *** program included both analytical and experimental studies,and addressed seismic hazard exposure and ground motion input for the *** system;foundation design and soil behavior: structural importance,analysis,and response:structural design issues and details;and structural design criteria.

关键词： Seismic design specifications bridges seismic hazard exposure ground motion input structural response analysis foundation design soil behavior

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Dynamic Response of foundations during Startup of High-Frequency Tunnel Equipment

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 821-844页

作者： Dawei Ruan Mingwei Hu College of Civil and Transportation Engineering Shenzhen UniversityShenzhen518060China State Key Laboratory of Intelligent Geotechnics and Tunnelling Shenzhen UniversityShenzhen518060China Key Laboratory of Coastal Urban Resilient Infrastructures of Ministry of Education Shenzhen UniversityShenzhen518060China Underground Polis Academy Shenzhen UniversityShenzhen518060China Shenzhen Key Laboratory of Green Efficient and Intelligent Construction of Underground Metro StationShenzhen UniversityShenzhen518060China

The specialized equipment utilized in long-line tunnel engineering is evolving towards large-scale,multifunctional,and complex *** vibration caused by the high-frequency units during regular operation is supported by the foundation of the units,and the magnitude of vibration and the operating frequency fluctuate in different engineering contexts,leading to variations in the dynamic response of the *** high-frequency units yield significantly diverse outcomes under different startup conditions and times,resulting in failure to meet operational requirements,influencing the normal function of the tunnel,and causing harm to the foundation structure,personnel,and property in severe *** article formulates a finite element numerical computation model for solid elements using three-dimensional elastic body theory and integrates field measurements to substantiate and ascertain the crucial parameter configurations of the finite element *** proposing a comprehensive startup timing function for high-frequency dynamic machines under different startup conditions,simulating the frequency andmagnitude variations during the startup process,and suggesting functions for changes in frequency and magnitude,a simulated startup schedule function for high-frequency machines is created through *** into account the selection of the transient dynamic analysis step length,the dynamic response results for the lower dynamic foundation during its fundamental frequency crossing process are *** validation checks if the structural magnitude surpasses the safety threshold during the critical phase of unit startup traversing the structural resonance *** design recommendations for high-frequency units’dynamic foundations are provided,taking into account the startup process of the machine and ensuring the safe operation of the tunnel.

关键词： Tunnel equipment high-frequency units startup conditions transient dynamics dynamic response foundation design

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foundation Assessment in Different Parts of Iraq Using STAAD Pro V8i

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Journal of Civil Engineering and Architecture 2013年第3期7卷 273-281页

作者： Entidhar A1-Taie Nadhir A1-Ansari Sven Knutsson Tarek Edrees Saaed Department of Civil Environment and Natural Resources Engineering Lulea University of Technology Lulea 97187 Sweden

foundation is considered as one of the main parts of any structure. The type of foundation used is highly dependent on the type and properties of soil. The design of foundations requires many factors that should be defined. There are number of differences in the geological and soil conditions in Iraq. As a consequence, these differences are reflected on the type of foundation to be used. Despite these differences, same materials and style of buildings are used all over Iraq. The main problems of Iraqi soil are high gypsum content, salinity and shallow water table depth. These factors that influence the foundations are the soil properties and the amount of loads that transmitted by the superstructure. The situation has been analysed through a case study which illustrated the link between soil and foundation types in three different parts of Iraq （Mosul, Baghdad and Basra）. One building was analysed using ＂STAAD （structural analysis and design）. Pro＂ software in these regions. It is evident that Iraqi designers and engineers require local code to define all the loads, materials and design of the foundation to be used. The use of local materials might be very effective from both engineering and economic perspectives.

关键词： Gypsum bearing capacity Iraqi soil raft foundation foundation design base pressure

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Millau viaduct geotechnical studies and foundations

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Journal of Rock Mechanics and Geotechnical Engineering 2013年第3期5卷 243-247页

作者： F.Schlosser C.Servant A.Guilloux A.Bergere ENPC France Eiffage Travaux Publics France Terrasol France

The Millau viaduct over the Tam River is an exceptional bridge considering the height under the deck and the 2.5 km total length. Each of the seven high piers is founded on a thick raft setting on four large piles of 5 m in diameter and 10-15 m deep. The ground schematically consists of limestone in the north and of marls in the south. As the bridge is very sensitive to foundation settlements, the concessionary company decided to use the observational method for controlling the displacements and if necessary stabilize the foundations. The measurements show that the movements have remained small and admissible, particularly in terms of the rotations. The settlements have not occurred continuously under the load, but by steps.

关键词： cable stayed bridge foundation design Pile settlement Rotation Observational method

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Permafrost and geotechnical investigations in Nalaikh Depression of Mongolia

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Research in Cold and Arid Regions 2015年第4期7卷 438-455页

作者： Dashjamts Dalai Batsaikhan Anand Dugersuren Enkhbaatar School of Civil Engineering and Architecture Mongolian University of Science and Technology Soil Trade LLC Novosibirsk State University of Architecture and Civil Engineering

Mongolia is a land-locked country in Central Asia, located between Russia and China. The country＇s high altitude results in cold, dry, and harsh climatic conditions with permafrost being widespread through the territory. Although the capital city Ulaanbaatar is situated in an area with discontinuous permafrost, the downtown section has recently seen a disappearance of permafrost due to an underground central heating system. During the last decade, expansion of the suburbs toward the Nalaikh Depression has resulted in construction of a new residential complex （Urgakh Naran）, construction materials trading center, cement factory and agricultural products market. In the next 10 years, projects such as a university campus, logistics center, residential complex, railway and highway extensions connecting Russia and China have been planned. Engineering-geological and geotechnical investigations have been conducted for these construction projects. This paper presents some of the results determining the engineering geocryological conditions of Nalaikh district and offers foundation design options.

关键词： permafrost seasonal thawing geotechnical investigation geocryological conditions foundation design

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