Analytical Simulations on Structural Experiments of One-Story One-Bay R/C Moment Resisting Frames With Non-Structural Walls

Abstract eng:
Reinforced concrete (R/C) buildings are often constructed monolithically with non-structural walls. Several past studies verified that monolithic non-structural walls significantly affected the structural performance of R/C moment resisting frames. Severe damage to non-structural walls was observed in a lot of R/C buildings not only after the 2011 off the Pacific coast of Tohoku, Japan earthquake but also earthquakes in other counties. This study mainly focuses on R/C non-structural walls used for exterior/partition walls in typical residential buildings in Japan. Cyclic loading tests were carried out using three 1/2.5 scale, one-story, one-bay R/C moment resisting frame specimens with/without non-structural walls which were monolithically constructed or structurally isolated by seismic slits. As a result, the isolated wall as well as the monolithic wall significantly increased the strength of the moment resisting frame specimen. Furthermore, this study presents analytical models to simulate the experimental results and to clarify the effects of the non-structural walls on the overall performance of the test specimens. The test specimens were replaced by line elements with the multi-spring models. In particular, however, the specimen with the isolated wall with the seismic slits was modeled considering tie bars provided between the main frame and the non-structural wall. The analytical simulations generally showed good agreements with the experimental results. In conclusion, the analytical models proposed in this study are effective to simulate the seismic performance/behavior of R/C moment-resisting frames with the typical non-structural walls used in Japan.

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