Estimating Out-of-Plane Strength of Cracked Masonry Infills

Shapiro, D.; Uzarski, J.; Webster, M.; Angel, R.; Abrams, Daniel P.

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https://hdl.handle.net/2142/14209 Copy

Description

Title

Estimating Out-of-Plane Strength of Cracked Masonry Infills

Author(s)

• Shapiro, D.
• Uzarski, J.
• Webster, M.
• Angel, R.
• Abrams, Daniel P.

Issue Date

1994-03

Keyword(s)

• Seismic strength
• Masonry infills

Abstract

The primary objective of the research project was to determine the transverse (out-of-plane) seismic strength of unreinforced masonry infill panels that have been cracked with in-plane lateral forces. The goal of the research was to develop a simple method that practicing engineers could use for evaluating strength of infill panels that have been damaged in earthquakes. In addition, the feasibility of using a low-cost repair or rehabilitation technique for improving transverse strength was examined. A total of 22 tests were run on eight large-scale masonry infill panels that were constructed in a single bay, single story reinforced concrete frame. Test panels were first subjected to in-plane load reversals to create a pre-existing cracked, damaged state for the subsequent out-of-plane tests which were done with an air bag. Following this test sequence, selected damaged panels were repaired and retested. Previous in-plane cracking was found to reduce out-of-plane strength by as much as a factor of two. However, transverse strength of a cracked masonry infill was found to be appreciable because of arching action. A simple equation was developed for out-of-plane strength based on the masonry compressive strength, the hit ratio, the amount of in-plane damage and the stiffness of the bounding frame. An evaluation procedure was developed based on this procedure.

Publisher

University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.

Series/Report Name or Number

Civil Engineering Studies SRS-588

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/14209

Sponsor(s)/Grant Number(s)

National Science Foundation Grants BCS 90-16875 and BCS 90-16509

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