|
|||||
|
|
Seismic Response Modification Factors for Reinforced Masonry Structural Walls |
|
| Authors: | Marwan T. Shedid Wael W. El-Dakhakhni Robert G. Drysdale |
| Affiliation: | 1Postdoctoral Fellow, Dept. of Civil Engineering, McMaster Univ., Hamilton, L8S 4L7, ON, Canada (corresponding author). E-mail: shedidmm@mcmaster.ca 2Martini Mascarin and George Chair in Masonry Design, Dept. of Civil Engineering, McMaster Univ., Hamilton, L8S 4L7, ON, Canada. E-mail: eldak@mcmaster.ca 3Professor Emeritus, Dept. of Civil Engineering, McMaster Univ., Hamilton, L8S 4L7, ON, Canada. E-mail: drysdale@mcmaster.ca |
| Abstract: | The current North American design standards provide seismic force modification factors for the rectangular masonry structural walls category only; no similar provisions for flanged and end-confined masonry structural walls exist. This study demonstrates that seismic force reduction factor (R) values calculated for rectangular walls was close to 5.0, which is consistent with the value stipulated by the ASCE 7, and was 36 and 90% higher for the corresponding flanged and end-confined walls. The deflection amplification factor (Cd) values calculated for rectangular walls were higher than specified in the ASCE 7 for the special reinforced masonry wall category. Values of the ductility-related force modification factor (Rd) for flanged and end-confined walls were, respectively, at least 30 and 100% higher than those of rectangular walls specified in the National Building Code of Canada (NBCC). Quantification of the seismic response parameters within this study is expected to facilitate adoption of the flanged and end-confined wall categories in North American masonry codes as a cost-effective technique to enhance the seismic performance of masonry construction. |
| Keywords: | Ductility Design Earthquakes Masonry Shear walls Seismic effects |