| Autor: |
Shoraka, Majid Baradaran, Dupuis, Michael, Macauley, James, Elwood, Kenneth, Anderson, Don, Simpson, Robert |
| Rok vydání: |
2014 |
| DOI: |
10.4231/d3k35mf2k |
| Popis: |
Building structural systems are commonly idealized as two distinct systems: a seismic force resisting system (SFRS), designed to resist lateral demands during strong ground shaking, and a gravity system, designed to support gravity loads and detailed to withstand imposed lateral deformations during seismic response without loss of gravity-load support. However, current architectural trends have resulted in modern buildings with inclined facades and irregularities in the gravity system which apply permanent lateral demands to the SFRS. Any impact the gravity system may have on the response of the SFRS is not currently considered during the design process or in the current building codes. This paper summarizes the results of a study to identify if there are behavioural trends not recognized within the scope of current building codes. To this end, a nonlinear, parametric study was conducted in a structural analysis platform to investigate the inelastic response of concrete shear wall buildings including gravity-induced lateral demands with a range of design characteristics at various hazard levels. This paper introduces advanced analytical models that can be used to simulate the nonlinear dynamic response of these structural shear walls, including collapse. Incremental dynamic analyses are also conducted to evaluate the collapse performance of the different structural systems. The results demonstrate that a seismic ratcheting effect can develop and amplify inelastic displacement demands which lead to an increase in the structural collapse metrics. The effect is significantly more prevalent in coupled shear walls compared with cantilevered shear walls. An irregularity class to address buildings with permanent lateral demands on the seismic force resisting system is proposed for the National Building Code of Canada. This code change proposal for NBCC 2015 is discussed in this paper. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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