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Out-of-plane strength reduction of unreinforced masonry walls because of in-plane damages

Dolatshahi, K. M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1002/eqe.2574
  3. Publisher: John Wiley and Sons Ltd , 2015
  4. Abstract:
  5. There are numerous studies on the behavior of Unreinforced Masonry (URM) walls in both in-plane (IP) and out-of-plane (OP) directions; however, few aimed at understanding the simultaneous contribution of these intrinsic responses during earthquakes. Undoubtedly, even a strong URM wall shows weakened capacity in the OP direction because of minor cracks and other damages in the IP direction, and this capacity reduction has not yet been accounted for in seismic codes. In this study, performance of three URM walls is evaluated by several numerical analyses in terms of the OP capacity reduction because of IP displacements and failure modes. Several parameters influencing the OP capacity have been studied including aspect ratio, roof boundary condition, IP displacement and IP loading patterns. The results indicate that reduction in the OP capacity of URM walls varies from negligible to very high depending on boundary conditions, IP failure mode and IP damage severity. Moreover, IP loading pattern is more important in walls with higher aspect ratios because of their IP failure modes
  6. Keywords:
  7. In-plane and out-of-plane interaction ; Roof boundary condition ; Unreinforced masonry wall ; Boundary conditions ; Failure modes ; Masonry construction ; Masonry materials ; Retaining walls ; Roofs ; Walls (structural partitions) ; Capacity reduction ; In-plane damages ; Intrinsic response ; Loading patterns ; Out-of plane ; Roof boundary ; Strength reduction ; Un-reinforced masonry walls ; Aspect ratio ; Boundary condition ; Building code ; Damage mechanics ; Earthquake engineering ; Failure analysis ; Masonry ; Roof ; Seismic design ; Structural analysis ; Wall
  8. Source: Earthquake Engineering and Structural Dynamics ; Volume 44, Issue 13 , 2015 , Pages 2157-2176 ; 00988847 (ISSN)
  9. URL: http://onlinelibrary.wiley.com/doi/10.1002/eqe.2574/abstract