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Bidirectional behavior of unreinforced masonry walls

Dolatshahi, K. M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1002/eqe.2455
  3. Abstract:
  4. Most of the studies related to the modeling of masonry structures have by far investigated either the in-plane (IP) or the out-of-plane (OP) behavior of walls. However, seismic loads mostly impose simultaneous IP and OP demands on load-bearing or shear masonry walls. Thus, there is a need to reconsider design equations of unreinforced masonry walls by taking into account bidirectional effects. The intent of this study is to investigate the bidirectional behavior of an unreinforced masonry wall with a typical aspect ratio under different displacement-controlled loading directions making use of finite element analysis. For this purpose, the numerical procedure is first validated against the results of the tests on walls with different failure modes conducted by the authors. Afterward, the response of the wall systems is evaluated with increasing top displacement having different orientations. A set of 19 monotonic and three cyclic loading analyses are performed, and the results are discussed in terms of the variation of failure modes and load-displacement diagrams. Moreover, the results of wall capacity in each loading condition are compared with those of the ASCE41-06 formulations. The results indicate that the direction of the resultant force, vectorial summation of IP and OP forces, of the wall is initially proportional to the ratio of stiffness in the IP and the OP directions. However, with the increase of damage, the resultant force direction inclines towards the wall's longitudinal direction regardless of the direction of the imposed displacement. Finally, recommendations are made for applicability of ASCE41-06 formulations under different bidirectional loading conditions
  5. Keywords:
  6. Finite element modeling ; In-plane and out-of-plane interaction ; Unreinforced masonry walls ; Aspect ratio ; Displacement control ; Finite element method ; Loads (forces) ; Masonry construction ; Masonry materials ; Retaining walls ; Bidirectional loading ; Bidirectional effects ; Imposed displacements ; Longitudinal direction ; Masonry structures ; Numerical procedures ; Out of plane ; Walls (structural partitions)
  7. Source: Earthquake Engineering and Structural Dynamics ; Vol. 43, Issue 15 , 1 December , 2014 , pp. 2377-2397 ; ISSN: 00988847
  8. URL: http://onlinelibrary.wiley.com/doi/10.1002/eqe.2455/abstract;jsessionid=4F044E17591D243D72D67974B688B757.f03t03?systemMessage=Wiley+Online+Library+will+have+intermittent+access+on+8th+August+2015+from+10%3A00-16%3A00+BST+%2F+05%3A00-11%3A00+EDT+%2F+17%3A00-23%3A00+SGT+for+essential+maintenance.++Apologies+for+the+inconvenience