EFFECT OF PERIMETER BRICK-CONCRETESTONE-MASONRY INFILL WALLS ON THE DEFLECTION AMPLIFICATION FACTOR FOR INTERMEDIATE MOMENT RESISTING FRAMES

Masarwa, Khalid

EFFECT OF PERIMETER BRICK-CONCRETESTONE-MASONRY INFILL WALLS ON THE DEFLECTION AMPLIFICATION FACTOR FOR INTERMEDIATE MOMENT RESISTING FRAMES

Date

2024-06-12

Authors

Masarwa, Khalid

Publisher

An-Najah National University

Abstract

Constructing of multi-story buildings using perimeter walls with stone cladding is very common in Palestine. The stone cladding provides an architectural aesthetic to the exterior facades of the buildings. The traditional method in Palestine to construct these walls is to fill the reinforced concrete frames with a three-layer wall. These layers are: brick, concrete, and stone. The walls may affect the behavior of the structure under an earthquake excitation. This results from their additional mass, lateral stiffness and strength that these walls add to the building. Neglecting the effect of these walls on the structural response can lead to a poor structural analysis prediction of the real structural behavior. Therefore, this study focuses on studying the effect of perimeter brickconcrete-stone-masonry (BCSM) infill walls on the deflection amplification factor (Cd) for intermediate moment resisting frames. The research methodology started by designing 36 cases according to ASCE7-16 and ACI 318-14 codes. In every case, the building is designed as an intermediate moment resisting frame. Nonlinear static pushover analysis is performed to generate load-deflection curves for different parameters using SAP2000 computer program. The results are used to estimate the Cd-factor under the variation of the parameters. In this study, it was found that the Cd-Factor is very sensitive to the presence of BCSM infill walls; it can lead to a significant change in the Cd-Factor compared to what is suggested by the ASCE7- 16 code. The results of this study showed that the increase of the BCSM infill walls opening ratio leads to a decrease in the Cd-Factor, and the increase of the BCSM infill walls length leads to a decrease in the Cd-Factor. Also, in this study, it was found that the Cd-Factor is not fixed with varying the number of stories of a building. In other words, it is not true that the increase in the number of stories will always increase the Cd-Factor and vice versa. Results were used to develop two simple formulas to estimate the Cd-Factor, and to help engineers in Palestine to estimate the Cd-Factor for buildings that have BCSM infill walls. Keywords: Macro modeling; Fiber hinges; BCSM infill walls; Cd-Factor; R-Factor; Equivalent compression struts; Overstrength.

Citation

Masarwa, K. (2024). Effect of Perimeter Brick-Concrete-Stone-Masonry Infill Walls on the Deflection Amplification Factor for Intermediate Moment Resisting Frames. An-Najah National University.