| Autor: |
Davaran, Ali, Decaen, Sophie, Tremblay, Robert |
| Rok vydání: |
2014 |
| DOI: |
10.4231/d3t14tq2r |
| Popis: |
The paper presents a detailed numerical model that was developed using the OpenSees platform to predict the seismic response of X-braced frames in multi-storey building steel structures. The bracing members are HSS members with slotted-HSS bolted-plate connections, as commonly used in practice. Recent tests of full-scaled X-bracing systems designed using traditional methods have revealed that buckling of the compression braces is affected by the flexibility the connection components, which reduces the compressive resistance and energy dissipation capacity of the compression bracing members. This may also be a concern for this seismic force resisting system as excessive inelastic demand may develop in the brace connections and lead to premature failure in connections. Design methods have recently been proposed to increase the buckling strength of connections and mitigate these detrimental effects on the structure seismic performance. The validation of the proposed numerical model against test data is presented in the paper. The model can reproduce connection instability failure modes for both single shear and double shear connection configurations. The influence of the proposed connection strengthening schemes can also be investigated with the proposed model. The second part of the paper presents nonlinear time history analyses performed to study the seismic performance of prototype building structures designed according to the 2010 National Building Code of Canada and the CSA S16-09 steel design standards. The structures have two stories in height and are located in eastern and western regions of Canada. Two types of connections are investigated: single-shear-lap and double-shear-lap connections. The connections are designed using both the traditional and the proposed design methods for enhanced seismic behavior. The analyses are then used to compare the structure performance for both design approaches. Key behavioral characteristics such as story drifts and the loads delivered to the secondary components are used as measures to verify performance satisfaction. When connection buckling is inevitable, a parametric study is accomplished to determine the minimum connection plate thickness required to achieve a desirable response. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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