Seismic performance of steel moment resisting frames retrofitted with a locally reduced beam section connection

1997 ◽  
Vol 24 (1) ◽  
pp. 78-89 ◽  
Author(s):  
R Tremblay ◽  
A Filiatrault
Keyword(s):  
Seismic Performance ◽  
Steel Moment Resisting Frames ◽  
Reduced Beam Section ◽  
Moment Resisting Frames ◽  
Moment Resisting ◽  
Beam Section

The effect of stiffener on behavior of reduced beam section connections in steel moment-resisting frames

2015 ◽  
Vol 15 (4) ◽  
pp. 827-834 ◽  
Author(s):  
M. Tahamouli Roudsari ◽  
F. Abdollahi ◽  
H. Salimi ◽  
S. Azizi ◽  
A. R. Khosravi
Keyword(s):  
Steel Moment Resisting Frames ◽  
Reduced Beam Section ◽  
Moment Resisting Frames ◽  
Moment Resisting ◽  
Beam Section

VULNERABILITY REDUCTION OF STEEL MOMENT RESISTING FRAMES BY MEANS OF REDUCED BEAM SECTION

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Rosario Montuori
Keyword(s):  
Seismic Load ◽  
Steel Moment Resisting Frames ◽  
Reduced Beam Section ◽  
Load Combination ◽  
Plastic Mechanism ◽  
Moment Resisting ◽  
Final Design ◽  
Mechanism Control ◽  
Beam Section ◽  
The Cost

The idea and the developed example of this work are based on the attainment of seismic performance improvement by simply trimming the flanges of the beam-ends. This strategy is to be applied by considering both the results of the theory of plastic mechanism control and the rules assuring the yielding of reduced beam sections (RBS) when seismic loads are applied to the structure. The results of such strategy are not always effective. In fact, there are several conditions that are to be satisfied in order to obtain an actual seismic improvement. Notwithstanding, when these conditions are satisfied, the cost of intervention can be considered as negligible. For this reason, this strategy can be very interesting and the rules applied in this work can clarify which is the effect of RBS taking into account all the parameters playing a role in the final design, i.e. existing column sections, resistance and ductility of existing connections, vertical loads acting in seismic load combination, amount of the reduction of beam section and its distance from the connection.

scholarly journals Performance-Based Multiobjective Optimal Seismic Retrofit Method for a Steel Moment-Resisting Frame Considering the Life-Cycle Cost

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Hyo Seon Park ◽  
Dong Chul Lee ◽  
Byung Kwan Oh ◽  
Se Woon Choi ◽  
Yousok Kim
Keyword(s):  
Seismic Performance ◽  
Life Cycle Cost ◽  
Optimization Technique ◽  
Seismic Retrofit ◽  
Seismic Damage ◽  
Damage Cost ◽  
Pareto Solution ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Moment Resisting

This study proposes a performance-based multiobjective optimization seismic retrofit method for steel moment-resisting frames. The brittle joints of pre-Northridge steel moment-resisting frames are retrofitted to achieve ductility; the method involves determining the position and number of connections to be retrofitted. The optimal solution is determined by applying the nondominated sorting genetic algorithm-II (NSGA-II), which acts as a multiobjective seismic retrofit optimization technique. As objective functions, the initial cost for the connection retrofit and lifetime seismic damage cost were selected, and a seismic performance level below the 5% interstory drift ratio was employed as a constraint condition. The proposed method was applied to the SAC benchmark three- and nine-story buildings, and several Pareto solutions were obtained. The optimized retrofit solutions indicated that the lifetime seismic damage cost decreased as the initial retrofit cost increased. Although every Pareto solution existed within a seismic performance boundary set by a constraint function, the seismic performance tended to increase with the initial retrofit cost. Analysis and economic assessment of the relations among the initial retrofit cost, lifetime seismic damage cost, total cost, and seismic performance of the derived Pareto solution allow building owners to make seismic retrofit decisions more rationally.

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