00624893

Component

http://onlinepubs.trb.org...trr/1992/1336/1336-003.pdf

https://scholar.google.co...choa&publication_year=1992

A laboratory model study of tension piles subjected to simulated seismic loading through the soil was conducted. The objective of the study was to assess the magnitude of biased (static) tension load that can be sustained by displacement-type piles driven into medium dense, saturated fine sand during seismic events typical of those in Southern California. The prototype pile characteristics modeled in this study consisted of a closed-end, or plugged, impact-driven pipe pile, 20 to 40 in. in diameter, 20 to 40 ft long (or top 20 to 40 ft of a longer pile). An acceleration record for a particular magnitude 5.8 seismic event, the Oceanside, California, earthquake of July 13, 1986, measured at an offshore deep soil site 45 mi (74 km) from the epicenter, was selected and scaled to higher magnitudes to simulate more severe earthquake loading conditions on the pile. A 21-in.-high by 20-in.-diameter pressure chamber was used to contain the saturated soil and to simulate isotropic effective stresses and drainage conditions. The model test pile was an instrumented, steel, closed-end tube, 1 in. in diameter and 16 in. long, that was loaded through a spring-mass system to simulate feedback from a simple superstructure with a known natural period. Pile-head movements, pile load versus depth, and pore water pressures in the soil were measured during the experiments. Both the simulated seismic record and soil permeability were scaled to model the effect of drainage distance and its effect on pore water pressure generation and dissipation. Contour plots of stability conditions (sustained tension resistance and small pile movements), mobility conditions (sustained resistance associated with substantial pile movements), and failure conditions (total loss of pile capacity) for the model pile were developed from the tests. The effect of distance between the pile and event epicenter on stability was considered analytically.

This paper appears in Transportation Research Record No. 1336, Foundation Engineering: Seismic Design, Drilled Shafts, and Other Issues. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01404959

English

p. 17-23

1992

Transportation Research Record

0309051746

Figures (13) ; References (4)

Distance; Drainage; Earthquakes; Failure; Laboratory tests; Motion; Permeability; Pipe; Pore water pressures; Sand; Simulation; Soils; Stability (Mechanics); Support piles; Test piles

Model tests; Pipe piles; Seismic loading

Bridges and other structures; Design; Geotechnology; Highways; Hydraulics and Hydrology; I24: Design of Bridges and Retaining Walls; I42: Soil Mechanics

TRIS, TRB, ATRI

Sep 8 1993 12:00AM

• BEARING CAPACITY DETERMINATION METHOD FOR STRIP SURFACE FOOTINGS UNDERLAIN BY VOIDS
• COMPARISON OF MEASURED AND COMPUTED DRILLED SHAFT CAPACITIES BASED ON UTAH LOAD TESTS
• DYNAMIC CENTRIFUGE MODELING OF GEOTECHNICAL STRUCTURES
• DYNAMIC CENTRIFUGE MODELING OF SOUND WALLS SUPPORTED ON CONCRETE CANTILEVER AND MECHANICALLY STABILIZED EARTH RETAINING STRUCTURES
• DYNAMIC TESTING OF DRILLED SHAFTS
• EFFECTS OF STRATIGRAPHIC AND CONSTRUCTION DETAILS ON THE LOAD TRANSFER BEHAVIOR OF DRILLED SHAFTS
• LATERAL SUBGRADE MODULUS OF SANDS FOR DEEP FOUNDATIONS
• MODELING SOIL REACTION TO LATERALLY LOADED PILES
• NUMERICAL SIMULATION OF REINFORCED SOIL STRUCTURES DURING BLAST LOADS
• OVERVIEW OF EVALUATION OF PILE FOUNDATION STIFFNESSES FOR SEISMIC ANALYSIS OF HIGHWAY BRIDGES
• SEISMIC HIGHWAY BRIDGE DESIGN USING SPECTRA SPECIFIC TO WASHINGTON STATE
• VERTICAL UPLIFT LOAD-DISPLACEMENT RELATIONSHIP OF HORIZONTAL ANCHORS IN SAND