Using Reliability To Incorporate Monotonic Test Data for a Code Compliant Masonry Long Wall Design Criteria

Abstract eng:
This paper demonstrates using the equations of structural reliability theory and the quality rating approach in FEMA P695 how structural engineers when they wish to use long concrete masonry shear walls to resist earthquake loads can have confidence that their design meets the intent of the current building codes. In this paper, a proprietary masonry product used in shear walls is utilized to illustrate the incorporation of monotonic test data and demonstrate their code compliance with respect to in-plane loads. We define a long wall to be one that has a length to width ratio greater than one. This type of wall has also been called a low-aspect ratio wall in FEMA P695 and a squat wall by others. This paper demonstrates the development of an alternative design procedure for long walls that satisfies the acceptable probabilities of annual failure due to earthquakes as defined in ASCE 7-10. Various structural analysis and reliability techniques to validate the alternative design criteria and verify the code compliance of the walls are presented in this paper as well.

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