A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Cyclic performance assessment of damaged unreinforced masonry walls repaired with steel mesh reinforced shotcrete
Highlights Application of SRS was studied both as a repair and retrofit technique for damaged and undamaged URM walls. Influence of opening and vertical load on hysteretic response of the repaired/retrofitted walls with SRS were assessed herein. The in-plane cyclic response of an SRS repaired URM wall was experimentally evaluated and compared and proved to be as effective SRS retrofitted URM with no prior damage. A new methodology for quantifying and calculating the seismic response parameters of the SRS applied URM walls was proposed and the results were compared for all of the specimens. Current relations for predicting the in-plane capacity of the SRS applied URM walls (with no prior damage) were assessed.
Abstract Unreinforced masonry (URM) buildings are rather popular around the globe due to low construction costs, even though they can be prone to substantial damage caused by even moderate earthquakes. Numerous URM buildings that have experienced damages from past earthquakes require to be upgraded or at least return to their undamaged state in order to be able to withstand future earthquakes. In many cases, reconstruction is not the best choice because of financial and time restrictions. As such, repair/retrofit is the best choice, assuring the post-earthquake serviceability. Furthermore, seismic repair/retrofit can be a cost-efficient method to avoid reconstruction complexities and expenses. In this study, steel-mesh reinforce shotcrete (SRS) is proposed as a cheap and simply conducted yet effective repair/retrofit method. To prove the enhanced capability of the proposed system, a series of experimental tests were carried out on typical 1:1.5 scale URM walls while considering influential parameters i.e., vertical load, presence of opening in the walls, and the effect of prior damage in the URM. The walls were first tested without any intervention to improve their response; then, the damaged walls were repaired using shotcrete on one side and tested again. The repaired/retrofitted walls performed even better than the undamaged URM walls. The results show notable improvement in lateral behavior resulting in an average increase of 288% in lateral strength capacity. More importantly, the repaired walls performed as well as the corresponding retrofitted undamaged wall. To quantify the response of the walls, response modification factors were calculated based on the backbone curves derived from the hysteresis curves.
Cyclic performance assessment of damaged unreinforced masonry walls repaired with steel mesh reinforced shotcrete
Highlights Application of SRS was studied both as a repair and retrofit technique for damaged and undamaged URM walls. Influence of opening and vertical load on hysteretic response of the repaired/retrofitted walls with SRS were assessed herein. The in-plane cyclic response of an SRS repaired URM wall was experimentally evaluated and compared and proved to be as effective SRS retrofitted URM with no prior damage. A new methodology for quantifying and calculating the seismic response parameters of the SRS applied URM walls was proposed and the results were compared for all of the specimens. Current relations for predicting the in-plane capacity of the SRS applied URM walls (with no prior damage) were assessed.
Abstract Unreinforced masonry (URM) buildings are rather popular around the globe due to low construction costs, even though they can be prone to substantial damage caused by even moderate earthquakes. Numerous URM buildings that have experienced damages from past earthquakes require to be upgraded or at least return to their undamaged state in order to be able to withstand future earthquakes. In many cases, reconstruction is not the best choice because of financial and time restrictions. As such, repair/retrofit is the best choice, assuring the post-earthquake serviceability. Furthermore, seismic repair/retrofit can be a cost-efficient method to avoid reconstruction complexities and expenses. In this study, steel-mesh reinforce shotcrete (SRS) is proposed as a cheap and simply conducted yet effective repair/retrofit method. To prove the enhanced capability of the proposed system, a series of experimental tests were carried out on typical 1:1.5 scale URM walls while considering influential parameters i.e., vertical load, presence of opening in the walls, and the effect of prior damage in the URM. The walls were first tested without any intervention to improve their response; then, the damaged walls were repaired using shotcrete on one side and tested again. The repaired/retrofitted walls performed even better than the undamaged URM walls. The results show notable improvement in lateral behavior resulting in an average increase of 288% in lateral strength capacity. More importantly, the repaired walls performed as well as the corresponding retrofitted undamaged wall. To quantify the response of the walls, response modification factors were calculated based on the backbone curves derived from the hysteresis curves.
Cyclic performance assessment of damaged unreinforced masonry walls repaired with steel mesh reinforced shotcrete
Ehteshami Moeini, Milad (author) / Razavi, S. Ali (author) / Yekrangnia, Mohammad (author) / Pourasgari, Parsa (author) / Abbasian, Navid (author)
Engineering Structures ; 253
2021-12-07
Article (Journal)
Electronic Resource
English
Experimental Results on Unreinforced Masonry Shear Walls Damaged and Repaired
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Cyclic Load Testing of Unreinforced Masonry Walls
| NTIS | 1992