An efficient method for optimizing the seismic resistance of reinforced concrete frame structures

2019 ◽  
Vol 23 (4) ◽  
pp. 670-686 ◽  
Author(s):  
Jiulin Bai ◽  
Shuangshuang Jin ◽  
Jinping Ou
Keyword(s):  
Reinforced Concrete ◽  
Nonlinear Dynamic Analysis ◽  
Design Procedure ◽  
Time History ◽  
Frame Structures ◽  
Optimization Approach ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Material Cost ◽  
Reinforced Concrete Frame Structures

A practical and efficient optimization procedure for designing reinforced concrete frame structures with improved resistance to seismic loading was developed. The design methodology used the optimality criteria method in an iterative analysis-and-redesign scheme. A damage ratio–based procedure was proposed by employing the inelastic component rotations from nonlinear dynamic analysis to strengthen the severely damaged components in each iteration. The optimization approach is intuitive, simple, and easy to apply, since only analysis tools are required. The approach was applied to optimize the seismic response of two prototype frames, and sensitivity analysis established the relationship between seismic performance and the additional material cost of strengthening. The proposed method can substantially reduce the maximum interstory drift for a slight increase of material cost, indicating that the proposed method is a feasible design procedure for improving the earthquake resistance of reinforced concrete frame structures. Also, the procedure can deal with the cases of single and multiple ground motions. The effectiveness of the proposed method was also verified through extensive time-history analyses.

scholarly journals Seismic behavior and retrofitting of reinforced concrete moment resistant frames

2021 ◽  
Author(s):  
Shahram Talebi
Keyword(s):  
Reinforced Concrete ◽  
Linear Time ◽  
Time History ◽  
Fiber Reinforced Polymers ◽  
Frame Structures ◽  
Reinforced Concrete Frame ◽  
Damage Potential ◽  
Concrete Frame ◽  
Seismic Zones ◽  
Reinforced Concrete Frame Structures

Many multistory reinforced concrete frame structures built prior to 1970's located in seismic zones have been designed only for gravity loads without any considerations for lateral loads. These structures are referred to as Gravity Load Designed (GLD) frames. The lack of seismic considerations in GLD structures results in non-ductile behavior that may cause the lateral load resistance of these buildings to be insufficient for even moderate earthquakes. Based on the current Canadian practice as prescribed by CAN3-A23.3 1994, reinforced concrete structures located in seismic zones should be designed as ductile or nominally ductile frames. In this study, a typical 5-story frame building is designed as (a) ductile, (b) nominally ductile and (c) GLD frame. Analytical investigation is performed to evaluate and to compare the performance of each frame. The study includes "pushover" analysis and non-linear time-history analysis. The results in terms of story displacement, ductility, shear, drift, sequence of cracking and yielding and the damage potential are presented. As a result of the poor performance of the GLD frame, it is retrofitted with fiber-reinforced polymers (FRP). Different retrofitting schemes using FRP are used to compare the behavior in terms of ductility. In this study, the behavior of the retrofitted frame is compared with the that of the GLD frame. Based on the results of this study, a guideline for improving the seismic performance of reinforced concrete frame structures is provided.

Seismic Performance of the Reinforced Concrete Frame Structures with Infilled Walls of Different Configuration

2014 ◽  
Vol 580-583 ◽  
pp. 1458-1462
Author(s):  
Min Sheng Guan ◽  
Hong Biao Du ◽  
Wei Chen ◽  
Yu Hua Wu
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Mode Analysis ◽  
Frame Structures ◽  
Seismic Action ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Reinforced Concrete Frame Structures ◽  
Nonlinear Time History

Using the three-strut model, five types of frame structures, i.e., without infilled walls, with full infilled walls, without bottom-storey infilled walls, without middle-storey infilled walls and without top-storey infilled walls, were studied. The mode analysis and nonlinear time-history analysis were carried out on each model. In order to investigate the effects of infilled walls with different configurations on the seismic behavior of reinforced concrete frame structures, the structural periods, the ratio of Tt to T1 and the maximum interstorey drifts were analyzed. The results indicate that the infilled walls enhance the lateral stiffness of frames, and the configuration of infilled walls has little influence on the calculation of structural periods. It also shows that the weaker storey is formed due to the unreasonable layout of infilled walls, thus leading to the collapse of the whole structures under the seismic action.

scholarly journals Seismic behavior and retrofitting of reinforced concrete moment resistant frames

2021 ◽  
Author(s):  
Shahram Talebi
Keyword(s):  
Reinforced Concrete ◽  
Linear Time ◽  
Time History ◽  
Fiber Reinforced Polymers ◽  
Frame Structures ◽  
Reinforced Concrete Frame ◽  
Damage Potential ◽  
Concrete Frame ◽  
Seismic Zones ◽  
Reinforced Concrete Frame Structures

Many multistory reinforced concrete frame structures built prior to 1970's located in seismic zones have been designed only for gravity loads without any considerations for lateral loads. These structures are referred to as Gravity Load Designed (GLD) frames. The lack of seismic considerations in GLD structures results in non-ductile behavior that may cause the lateral load resistance of these buildings to be insufficient for even moderate earthquakes. Based on the current Canadian practice as prescribed by CAN3-A23.3 1994, reinforced concrete structures located in seismic zones should be designed as ductile or nominally ductile frames. In this study, a typical 5-story frame building is designed as (a) ductile, (b) nominally ductile and (c) GLD frame. Analytical investigation is performed to evaluate and to compare the performance of each frame. The study includes "pushover" analysis and non-linear time-history analysis. The results in terms of story displacement, ductility, shear, drift, sequence of cracking and yielding and the damage potential are presented. As a result of the poor performance of the GLD frame, it is retrofitted with fiber-reinforced polymers (FRP). Different retrofitting schemes using FRP are used to compare the behavior in terms of ductility. In this study, the behavior of the retrofitted frame is compared with the that of the GLD frame. Based on the results of this study, a guideline for improving the seismic performance of reinforced concrete frame structures is provided.

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