Accession Number : ADA193595
Title : Behavior of Sand/Concrete Interfaces under Dynamic Loads.
Descriptive Note : Final rept. Apr 85-Jul 86,
Corporate Author : WASHINGTON STATE UNIV PULLMAN
Personal Author(s) : Bigelis, Robert L ; Sorensen, Harold C
PDF Url : ADA193595
Report Date : Apr 1988
Pagination or Media Count : 148
Abstract : The objective of this research effort was to conduct an experimental program to determine the dynamic shear response of dry sand/concrete interfaces. A series of dynamic direct shear interface tests was performed using Yuma and McCormick Ranch sands in contact with concrete. Each concrete specimen was cast against a plywood form. These experiments were conducted using various values of normal stress, shearing velocity, and sand density. Results obtained from the experiments indicate that peak strength of the interface was not rate dependent, while residual strength decreased with increasing shearing velocity. Interface strength was found to be 100 to 108 percent of the strength of the surrounding sand. Theoretically, the interface strength is limited by the strength of the sand. This discrepancy is attributed to experimental error. It is recommended that the strength of a dry sand/rough concrete interface be modelled using a Mohr envelope with a friction angle of 90 to 100 percent of the friction angle of the sand. This Mohr envelope would also be modified to model the curved envelope of typical sands when large ranges of normal stress are anticipated. It is also recommended that postfailure response be modelled by a perfectly plastic model when high magnitude normal stresses were applied, a near plastic behavior was observed beyond normal stresses of 2.5 MPa.
Descriptors : *CONCRETE, *INTERFACES, *SAND, *SHEAR PROPERTIES, ANGLES, CURVATURE, DENSITY, DRY MATERIALS, DYNAMIC LOADS, DYNAMIC RESPONSE, ENVELOPE(SPACE), FRICTION, MODELS, PEAK VALUES, PLASTIC PROPERTIES, RESIDUALS, STRENGTH(MECHANICS), STRESSES, FINITE ELEMENT ANALYSIS, MOTION, SOIL MECHANICS, STRUCTURAL RESPONSE
Subject Categories : Mechanics
Structural Engineering and Building Technology
Distribution Statement : APPROVED FOR PUBLIC RELEASE