| The Specification for Masonry Structures section of the current governing masonry design document in the U.S., reported by the Masonry Standards Joint Committee (MSJC), contains tables that can be used to determine the compressive strength of masonry, f'm, as a function of the mortar type and the compressive strength of the unit employed to construct the masonry (option #1). Alternatively, the compressive strength of brick masonry can be established by testing small specimens called prisms according to ASTM standardized procedures for construction and testing (option #2). However, the majority of the data gathered to create the current values for option #1 were generated in studies done prior to 1970. There have been significant changes in materials and procedures since this time frame. Thus, there is a need to gather and study more recent data that reflect the current type of material typically used at construction sites today, explore various potential influencing factors, and determine how significantly these factors affect the masonry prism compressive strengths. Finally, the results of this study can lead to ways the current design tables can be enhanced, and establish the areas where more research and testing are required. (Abstract shortened by UMI.)... |
