tailieunhanh - Soil–Foundation– Structure Interaction

Tseng, W., Penzien, J. "Soil-Foundation-Structure Interaction." Bridge Engineering Handbook. Ed. Wai-Fah Chen and Lian Duan Boca Raton: CRC Press, 2000 Soil–Foundation– Structure Interaction Introduction Description of SFSI Problems Bridge Foundation Types • Definition of SFSI Problems • Demand vs. Capacity Evaluations 42 Current State of the Practice Elastodynamic Method • Empirical p–y Method Seismic Inputs to SFSI System Free-Field Rock-Outcrop Motions at Control Point Location • Free-Field Rock-Outcrop Motions at Pier Support Locations • Free-Field Soil Motions Characterization of Soil–Foundation System Elastodynamic Model • Empirical p–y Model • Hybrid Model Wen-Shou Tseng International Civil Engineering Consultants, Inc | Tseng W. Penzien J. Soil-Foundation-Structure Interaction. Bridge Engineering Handbook. Ed. Wai-Fah Chen and Lian Duan Boca Raton CRC Press 2000 42 Soil-Foundation- Structure Interaction Wen-Shou Tseng International Civil Engineering Consultants Inc. Joseph Penzien International Civil Engineering Consultants Inc. Introduction Description of SFSI Problems Bridge Foundation Types Definition of SFSI Problems Demand vs. Capacity Evaluations Current State of the Practice Elastodynamic Method Empirical p-y Method Seismic Inputs to SFSI System Free-Field Rock-Outcrop Motions at Control Point Location Free-Field Rock-Outcrop Motions at Pier Support Locations Free-Field Soil Motions Characterization of Soil-Foundation System Elastodynamic Model Empirical p-y Model Hybrid Model Demand Analysis Procedures Equations of Motion Solution Procedures Demand Analysis Examples Caisson Foundation Slender-Pile Group Foundation Large-Diameter Shaft Foundation Capacity Evaluations Concluding Statements Introduction Prior to the 1971 San Fernando California earthquake nearly all damages to bridges during earthquakes were caused by ground failures such as liquefaction differential settlement slides and or spreading little damage was caused by seismically induced vibrations. Vibratory response considerations had been limited primarily to wind excitations of large bridges the great importance of which was made apparent by failure of the Tacoma Narrows suspension bridge in the early 1940s and to moving loads and impact excitations of smaller bridges. The importance of designing bridges to withstand the vibratory response produced during earthquakes was revealed by the 1971 San Fernando earthquake during which many bridge structures collapsed. Similar bridge failures occurred during the 1989 Loma Prieta and 1994 Northridge California earthquakes and the 1995 Kobe Japan earthquake. As a result of these experiences much has been done recently to