Load-Bearing Concrete Masonry Structures, Report 1: Engineering Methodology for General Structural Integrity: Fid-Bau Portal

Load-Bearing Concrete Masonry Structures, Report 1: Engineering Methodology for General Structural Integrity

N. W. Hanson / D. M. Schultz

This report discusses the design of unreinforced load - bearing masonry structures for normal and abnormal loadings. Special characteristics of masonry are illustrated by discussion of procedures used in analysis and design for normal loading conditions. Those special strengths and the nature of masonry as an assemblage of small parts are used to help identify and localize probable effects of abnormal loads. A methodology is developed to show that the function of continuity reinforcement is to ensure structural integrity of the building in the event of damage from abnormal loads. Working stress design for serviceability of load - bearing masonry buildings is well - defined in codes of practice. Anchorage of bearing walls to floors and roof provides continuity ties at connections. Based on a methodology of tie function in the event of damage from abnormal load, an indirect approach to minimum detailing is recommended. Minimum detailing is based on extent of damage and alternate paths (evaluation of alternate structural actions which can develop after a local disruption). This concept is intended to substantially reduce the risk of collapse as compared to usual design requirements. Figures and 25 references are provided. Metric conversion factors, a survey of masonry buildings, a glossary of terms, and notes on recent approaches to avoid progressive collapse are appended. (Author abstract modified).