Loading...

Value-based Seismic Performance Assessment of Common Masonry Facades in Iran

Khalili, Mohammad Reza | 2019

332 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51938 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Purestekanchi, Homayoon
  7. Abstract:
  8. Financial losses and casualties due to the collapse of the masonry facade and the infill walls of the building in recent earthquakes were motivators of this research to study seismic performance assessment of masonry facade. One of the main reasons for the collapse of buildings facade is their inadequate connection to the infill walls and structure frame. The mentioned item caused when earthquakes such as Kermanshah earthquake occurred, although a large number of buildings remained undamaged in terms of their structural, facades of these buildings collapsed. The details of the masonry facade, such as the metal wires mentioned in the codes, are not usually applied in Iran, and the connection to the infill walls and structure frame is merely through the mortar. In this research, for the evaluation of the seismic performance of masonry facade, the appropriate finite element model was produced of the masonry facade together with the masonry infill in which the facade is connected to the infill and steel frame by the mortar. For actual and correct loading, the dynamic loads are extracted from the 3D model of the building and applied to the facade model in both directions out-of-plane and in-plane concurrently. Fragility and casualties models were developed for this facade. In the end, the value-based seismic performance of masonry facade was compared with the Curtin Wall façade in a 10-story building. In this research, the seismic loss is determined based on probabilistic seismic assessment framework, which depends on the maximum dynamic response of structure in different seismic levels. The structure response is determined by the endurance time method, which has low computational cost and can predict the dynamic response of the structure at different risk levels with enough accuracy. After evaluating the seismic performance of the facade, it was concluded that the facade and the infill would collapse in the range of 0.3 to 0.5 gravitational acceleration (g), which would be less than the maximum magnitude of Earth's acceleration in the Kermanshah earthquake that was 0.68 of gravitational acceleration (g). Moreover, the results denoted that the masonry facade, despite lower initial cost, due to high life-cycle cost caused by damage to this facade in low-intensity earthquakes, have less value (initial costs + life-cycle costs) in comparison to the curtain wall system
  9. Keywords:
  10. Masonry Facade ; Fragility Curve ; Finite Element Model ; Endurance Time Method ; Life Cycle Cost (LCC) ; Seismic Performance

 Digital Object List

 Bookmark

No TOC