A Study on Dissipation of Cumulative Hysteretic Energy in Reinforced Concrete Frame Structures

2010 ◽  
Vol 163-167 ◽  
pp. 4301-4308
Author(s):  
Min Sheng Guan ◽  
Da Jian Han ◽  
Hong Biao Du ◽  
Xin Wang
Keyword(s):  
Reinforced Concrete ◽  
Distribution Pattern ◽  
Ground Motion ◽  
Time History ◽  
Frame Structure ◽  
Input Energy ◽  
Reinforced Concrete Frame ◽  
Hysteretic Energy ◽  
Concrete Frame ◽  
Reinforced Concrete Frame Structures

Earthquake input energy and structural energy dissipation are key indicators to assess the seismic performance of structures. To study the rules of distribution of hysteretic energy within structures, a 6-storey regular reinforced concrete frame structure model is analyzed through elasto-plastic time-history dynamic analysis using the El Centro and Northridge accelerograms. Based on the comparison between numerical results for the earthquake input energy and structural hysteretic energy under the minor, moderate and major earthquakes of Grade 8 and 9, the distribution of the ratio of the storey hysteretic energy to the total hysteretic energy through the height was further studied. It shows that the computed results corresponding to the two earthquake records are in good agreement under different ground motion severity. And the percentage of structural hysteretic energy to input energy is basically stable. The distribution pattern of storey hysteretic energy through the height is that the value of the upper stories is smaller than the value of the lower stories. And the ground motion severity has a minor influence on the distribution pattern when the plasticity of structure develops more sufficiently.

Seismic Performance Evaluation for Steel Reinforced Concrete Frame Structures

2011 ◽  
Vol 255-260 ◽  
pp. 2421-2425
Author(s):  
Qiu Wei Wang ◽  
Qing Xuan Shi ◽  
Liu Jiu Tang
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Seismic Performance Evaluation ◽  
Steel Reinforced Concrete ◽  
Concrete Frame ◽  
Structural Capacity ◽  
Reinforced Concrete Frame Structures ◽  
Dynamic Nonlinear Analysis

The randomness and uncertainty of seismic demand and structural capacity are considered in demand-capacity factor method (DCFM) which could give confidence level of different performance objectives. Evaluation steps of investigating seismic performance of steel reinforced concrete structures with DCFM are put forward, and factors in calculation formula are modified based on stress characteristics of SRC structures. A regular steel reinforced concrete frame structure is analyzed and the reliability level satisfying four seismic fortification targets are calculated. The evaluation results of static and dynamic nonlinear analysis are compared which indicates that the SRC frame has better seismic performance and incremental dynamic analysis could reflect more dynamic characteristics of structures than pushover method.

The influence of construction joint on the seismic behavior of reinforced concrete frame structure

2016 ◽  
Vol 20 (7) ◽  
pp. 1125-1138 ◽  
Author(s):  
Jing Yu ◽  
Xiaojun Liu ◽  
Xingwen Liang
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Numerical Models ◽  
Time History ◽  
Frame Structure ◽  
Nonlinear Time History Analysis ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Construction Joint ◽  
Story Drift

A new model that can simulate the behavior of construction joint subjected to seismic forces was proposed. Nonlinear time-history analysis was carried out for reinforced concrete regular frame structures designed in different seismic intensity regions as well as with different height-to-width ratios. Two kinds of numerical models are adopted to simulate the seismic behavior of each frame, one with construction joint using the new proposed model and the other without construction joint using the conventional model. Results show that the influence of construction joint on the seismic behavior of reinforced concrete frame is strongly related to structural nonlinearity. It may increase the top displacement and the inter-story drift, change the inter-story drift distributions, and exacerbated the local reaction of key members. The influence of construction joint cannot be ignored for structures with low emergency capacity against major earthquake. Seismic design suggestions are proposed from the aspect of calculation analysis method.

scholarly journals Analysis and design of a base-isolated reinforced concrete frame building

1978 ◽  
Vol 11 (4) ◽  
pp. 245-254 ◽  
Author(s):  
L. M. Megget
Keyword(s):  
Reinforced Concrete ◽  
Plastic Hinge ◽  
Time History ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Elastomeric Bearings ◽  
Analysis And Design ◽  
Concrete Frame ◽  
Frame Building ◽  
Reinforced Concrete Frame Structure

The paper describes the dynamic and static analyses and design of a four storey ductile reinforced concrete frame structure isolated from the foundations by elastomeric bearings incorporating lead energy dampers. Results from inelastic, time-history analyses for the isolated and non-isolated structure are compared for several input earthquake motions. The benefits of energy dampers in reducing the isolated building's response (shears, plastic hinge demands and interstorey drifts) are detailed. Differences from conventional ductile design and detailing as well as design recommendations are included.

The Modal Analysis of a Multilayer Concave-Convex Irregular Reinforced Concrete Frame Structures before and after Seismic Isolation

2013 ◽  
Vol 339 ◽  
pp. 632-634
Author(s):  
Fang Zhang
Keyword(s):  
Reinforced Concrete ◽  
Seismic Isolation ◽  
Base Isolation ◽  
Frame Structure ◽  
Frame Structures ◽  
Reinforced Concrete Frame ◽  
Cycle Frequency ◽  
Concrete Frame ◽  
Before And After ◽  
Reinforced Concrete Frame Structures

It used lead core type laminated rubber pad as a base isolation device. Using the ANSYS software, it analyzed the modality of a multilayer concave-convex irregular reinforced concrete frame structures before and after seismic isolation. Comparison of the cycle, frequency and modal participation mass coefficient of the multilayer concave-convex irregular reinforced concrete frame structure before and after isolation in Kobe wave. It concluded that the lead laminated rubber bearings for multilayer concave-convex irregular reinforced concrete frame structures have seismic isolation effect.

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.

Influence of ground motion duration on the dynamic deformation capacity of reinforced concrete frame structures

2021 ◽  
pp. 875529302110338
Author(s):  
Vishvendra Bhanu ◽  
Reagan Chandramohan ◽  
Timothy J Sullivan
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Dynamic Deformation ◽  
Ground Motions ◽  
Geometric Mean ◽  
Deformation Capacity ◽  
Reinforced Concrete Frame ◽  
Moment Frame ◽  
Concrete Frame ◽  
Reinforced Concrete Frame Structures

This study investigates the influence of ground motion duration on the dynamic deformation capacity of a suite of 10 modern reinforced concrete moment frame buildings. A robust numerical algorithm is proposed to estimate the dynamic deformation capacity of a structure by conducting incremental dynamic analysis. The geometric mean dynamic deformation capacity of the considered buildings was, on average, found to be 26% lower under long duration ground motions, compared to spectrally equivalent short duration ground motions. A consistent effect of duration on dynamic deformation capacity was observed over a broad range of structural periods considered in this study. Response spectral shape, however, was found to not significantly influence dynamic deformation capacity. These results indicate that the effect of duration could be explicitly considered in seismic design codes by modifying the deformation capacities of structures.

The Influence of near-Fault Ground Motions on the Seismic Response of Reinforced Concrete Frame

2011 ◽  
Vol 90-93 ◽  
pp. 2633-2639
Author(s):  
Chang Hao Zhang ◽  
Wei Wang ◽  
Hu Wang ◽  
Xun Tao Wang
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Ground Motions ◽  
Time History ◽  
Far Field ◽  
Base Shear ◽  
Reinforced Concrete Frame ◽  
Structural Dynamic ◽  
Concrete Frame ◽  
Near Fault

This paper examined the engineering characteristics of the near-fault ground motion. The four-story reinforced concrete frame was designed under Code for seismic design of building (GB50011-2010).The SAP2000 software was applied to model it, and the nonlinear time history analyses of structure were implemented. Near-fault ground motions with forward directivity and fling-step and far field ground motions were selected as seismic inputs．The results show that in terms of some structural dynamic response parameters, such as the vertex displacement, between the corner of the layer displacement, and the base shear et al., the structural responses to the ground motion with near-fault are increased by considerable magnitudes when the seismic responses of structures step into the elastic-plastic stage, compared with far-field ground motion, and the influence of damaging the mid-lower structure is significantly greater.

The Failure Mechanism Analysis on a Reinforced Concrete Frame Structure in Beichuan County - The Heavy Disaster Areas of Wenchuan 8.0 Earthquake

2010 ◽  
Vol 452-453 ◽  
pp. 221-224
Author(s):  
Pei Lei Yan ◽  
Bai Tao Sun ◽  
Qiang Zhou
Keyword(s):  
Reinforced Concrete ◽  
Time History ◽  
Frame Structure ◽  
Nonlinear Static Analysis ◽  
Mechanism Analysis ◽  
Analysis Model ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Reinforced Concrete Frame Structure ◽  
Beichuan County

On 12 May 2008, a magnitude 8.0 earthquake happened in Wenchuan, Sichuan province, China .It was the most serious earthquake in china since 1949, causing very huge casualties and engineering damages to the buildings. In the earthquake, a reinforced concrete frame structure of Beichuan Hotel in Beichuan County collapsed completely because of the unsuitable arrangement of column network, and the engineering damage was characteristic. In the paper, the properties of material nonlinearity were considered ,the nonlinear analysis model of reinforced concrete frame structure was established, the time history analysis and nonlinear static analysis were used during inelastic stage, the main cause of structural destruction was obtained, the influence of the arrangement of column network on the structure was discussed.Therefore ,the results can provide valuable reference for the seismic design of reinforced concrete frame structure.

Failure Modes-Based Searching and Optimizing of Steel Reinforced Concrete Frame Structures

2014 ◽  
Vol 578-579 ◽  
pp. 691-694
Author(s):  
Yan Fang Zhu ◽  
Bing Xiong ◽  
Zhi Qiang Li
Keyword(s):  
Reinforced Concrete ◽  
Seismic Waves ◽  
Failure Modes ◽  
Optimization Methods ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Steel Reinforced Concrete ◽  
Concrete Frame ◽  
Reinforced Concrete Frame Structure ◽  
Reinforced Concrete Frame Structures

Taking the optimization of steel reinforced concrete frame structure as background, the searching and optimizing of structural were taken as optimization objectives by introducing failure modes. Incremental dynamic analysis (IDA) was used to search the seismic wave, which had important significance of the structure, thus, the failure modes under the seismic waves could be obtained. And three optimization methods were proposed. Finally, an example was analyzed to verify the rationality of the proposed optimization thought and method.

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.

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