SEISMIC PERFORMANCE EVALUATION OF PILOTI-TYPE BUILDINGS AFTER AN EARTHQUAKE

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Hye-min Shin ◽  
Kyung-jae Shin ◽  
Su-woong Lee ◽  
Dae-geun Kim ◽  
Min-ki Lee ◽  
...  
Keyword(s):  
Large Scale ◽  
Dynamic Test ◽  
Time History ◽  
Seismic Retrofitting ◽  
Nonlinear Time History Analysis ◽  
Reinforced Concrete Frame ◽  
Seismic Performance Evaluation ◽  
Concrete Frame ◽  
Recent Earthquakes ◽  
Nonlinear Time History

On November 15, 2017, the second strongest earthquake occurred in Korea, which was 5.4 in size on the Richter Scale. The duration of the earthquake was short, but the damage was serious. Two recent earthquakes have shown that our country is no longer safe from earthquakes. However, to date, Korean structures are showing a low earthquake resistance, and seismic retrofitting is necessary in preparation for a large-scale earthquake. In this study, reinforcing effect of steel slit damper was analyzed based on the dynamic test results of the previously studied reinforced concrete frame. After that, push over analysis and nonlinear time history analysis using OpenSees were selected for the residential piloti-type building as the target building. In the above Korean earthquake, the damage to the piloti-type building was conspicuous. Through analysis, the vulnerable part of the piloti-type building was identified and the seismic strengthening with the steel slit damper was carried out.

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.

Isolated Structures Research and Comparative with Traditional Seismic Structures

2012 ◽  
Vol 594-597 ◽  
pp. 1734-1739
Author(s):  
Min Yao ◽  
Tie Ying Li
Keyword(s):  
Base Isolation ◽  
Design Method ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Reinforced Concrete Frame ◽  
Maximum Displacement ◽  
Concrete Frame ◽  
Rare Earthquake ◽  
Traditional Structures ◽  
Nonlinear Time History

This paper introduces the concept and design method of the base isolation structure, through the SAP2000 software to analyze 6-story reinforced concrete frame for nonlinear time-history analysis, comparison of isolated and non-isolated structure's maximum displacement, acceleration under frequent earthquake and the maximum displacement, acceleration of isolation structure under rare earthquake. The results show that the isolated structure have a much better seismic responding than the traditional structures.

Strengthening Research in the Longitudinal Frames of Prefabricated Structures with Viscous Dampers

2013 ◽  
Vol 671-674 ◽  
pp. 782-785
Author(s):  
Bin He ◽  
Jin Lai Pang ◽  
Cheng Qing Liu
Keyword(s):  
Seismic Performance ◽  
Pushover Analysis ◽  
Vertical Direction ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Viscous Dampers ◽  
Existing Building ◽  
Concrete Frame ◽  
Uniform Drift ◽  
Nonlinear Time History

For the lack of research in the longitudinal frame of prefabricated structure for its weak lateral stiffness, pushover analysis is conducted to evaluate the seismic performance of a fabricated concrete frame. Based on case study, the strengthening strategies with viscous dampers are analyzed. In view of the undesirable drift distribution and failure mode in the existing building, it is believed that arrangement of dampers should be designed to attain a uniform drift distribution. Based on the nonlinear time history analysis method, the strategy of damper allocation in vertical direction of the structure is investigated .Results indicate that a proper design might be attained based on the property of existing system, leading to a uniform drift distribution and better seismic performance.

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 AN INVESTIGATION ABOUT EFFECTS OF FLUID-STRUCTURE-SOIL INTERACTION ON RESPONSE MODIFICATION COEFFICIENT OF ELEVATED CONCRETE TANKS

2016 ◽  
Vol 8 (1) ◽  
pp. 1-7
Author(s):  
Mirtaha Hashemi ◽  
Khosrow Bargi
Keyword(s):  
Plastic Hinge ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Fluid Structure Interactions ◽  
Fluid Structure ◽  
History Analysis ◽  
Elevated Tanks ◽  
Recent Earthquakes ◽  
Nonlinear Time History ◽  
Seismic Forces

This paper aims to observe effects of fluid-structure-soil interactions on the response modification coefficient of elevated concrete tanks with frame and shaft supporting systems. Because of weaknesses and failures of elevated tanks that have been reported in recent earthquakes and importance of optimum and resistant design and also better seismic performance of these structures, it is essential to investigate on the response modification coefficient of elevated concrete tanks. In this paper, the response modification coefficient has been evaluated by using the numerical modeling. The method of research is a case study. The models have been subjected to an ensemble of important earthquake ground motions. The effects of soilstructure interactions and fluid-structure interactions on seismic behavior of the elevated concrete tanks have been modeled by the equivalent springs and Housner’s method, respectively. Dynamic response of the elevated tanks has been considered by using the nonlinear time history analysis and the discrete plastic hinge approach. Finally, the effects of fluid-structure-soil interactions on the response modification coefficient of the elevated concrete tanks have been discussed by considering results of the analyses. It has been concluded that the codes may underestimate base seismic forces for some seismic regions and some subsoil classes.

scholarly journals Research on Application of Buckling Restrained Braces in Strengthening of Concrete Frame Structures

2020 ◽  
Vol 6 (2) ◽  
pp. 344-362
Author(s):  
Niyonyungu Ferdinand ◽  
Zhao Jianchang ◽  
Yang Qiangqiang ◽  
Guobing Wang ◽  
Xu Junjie
Keyword(s):  
Bearing Capacity ◽  
Time History ◽  
Time History Analysis ◽  
Nonlinear Time History Analysis ◽  
Frame Structures ◽  
Concrete Frame ◽  
History Analysis ◽  
Seismic Design Code ◽  
Buckling Restrained Braces ◽  
Nonlinear Time History

This paper examines the application of BRB in strengthening of reinforced concrete frame structures to meet seismic requirements according to Chinese seismic design code. Elastic response spectrum analysis and nonlinear time history analysis are performed by taking a real engineering example that suffers weak first floor irregularity due to added loads and addition of one floor. With the method of equivalent stiffness and displacement-based design method, buckling restrained brace parameters are deduced and are used to model BRB in ETABS using plastic wen model. Three configurations of buckling restrained braces are studied together with ordinary braces. Under elastic state, the relationship between the required cross section area of BRB and ordinary braces is deduced from the formula of calculating elastic bearing capacity where it is shown that the area of the ordinary braces must be 1.25 times that of BRB for ensuring the same performance. The results show that Inverted V brace configuration demonstrated better performance over single brace and V brace configurations and X brace configuration, although not recommended by Chinese code, is simulated and used in this paper and has demonstrated better performance over other configurations, and the further research on the practical use of this brace is recommended. Also, under action of strong earthquakes, by nonlinear time history analysis, buckling restrained braces demonstrated better performance of strengthening the structure and make it meet the requirement of code. Under this same condition, ordinary braces losses their bearing capacity due to excessive buckling.

Seismic Performance Evaluation of a Steel-Concrete Hybrid Frame-Tube High-Rise Building Structure

2011 ◽  
Vol 137 ◽  
pp. 149-153 ◽  
Author(s):  
Huan Jun Jiang ◽  
Bo Fu ◽  
Lao Er Liu
Keyword(s):  
Numerical Analysis ◽  
Seismic Performance ◽  
Mainland China ◽  
Time History ◽  
Tall Buildings ◽  
Hybrid Structure ◽  
Nonlinear Time History Analysis ◽  
Seismic Performance Evaluation ◽  
History Analysis ◽  
Nonlinear Time History

Due to its unique advantages, the steel-concrete hybrid structure has been widely used in tall buildings around the world. In Mainland China it has been utilized as one of the most popular structural types for super tall buildings. In this study the seismic performance of a code-exceeding tall building with the hybrid frame-tube structure to be constructed in Beijing is evaluated by numerical analysis. The analytic model of the structure is established with the aid of PERFORM-3D program, and the nonlinear time history analysis is performed by inputting four sets of earthquake ground motions. The elastic dynamic characteristics, the global displacement responses, the performance levels and the deformation demand-to-capacity ratios of structural components under different levels of earthquakes are presented. Numerical analysis results indicate that the hybrid structure has good seismic performance.

Buildings Subjected to Recurring Earthquakes: A Tale of Three Cities

2011 ◽  
Vol 27 (3) ◽  
pp. 635-659 ◽  
Author(s):  
Beyhan Bayhan ◽  
Polat Gülkan
Keyword(s):  
Shear Failure ◽  
Near Field ◽  
Time History ◽  
Strong Motion ◽  
Analytical Models ◽  
Motion Sensors ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Input Motion ◽  
Nonlinear Time History

Three different buildings built according to the same design have experienced three different near-field strong ground motions over a period of 11 years in three different cities in Turkey. The input motion was known for each because strong-motion sensors were located adjacent or close to the buildings. We examine the performance of the five-story, reinforced concrete-frame buildings. Bidirectional nonlinear time history and nonlinear static analyses on 3-D analytical models are performed. The principal focus is to assess whether the analytical model of the buildings could indicate column-beam damage consistent with that observed at the sites after the earthquakes. Results illustrate that nonlinear time history analyses are capable of indicating the occurrence of shear failure in captive columns; however, they overestimate the global damage. The overestimation is greater where the building sustained a pulse-type motion without significant distress. It appears that difference between visual observations and analytical results persists.

scholarly journals Shear Behavior of a Reinforced Concrete Frame Retrofitted with a Hinged Steel Damping System

2020 ◽  
Vol 12 (24) ◽  
pp. 10360
Author(s):  
Hyun-Do Yun ◽  
Sun-Woong Kim ◽  
Wan-Shin Park ◽  
Sun-Woo Kim
Keyword(s):  
Reinforced Concrete ◽  
Shear Behavior ◽  
Seismic Retrofitting ◽  
Reinforced Concrete Frame ◽  
Main Research ◽  
Torsion Spring ◽  
Concrete Frame ◽  
Energy Dissipation Capacity ◽  
Research Questions ◽  
Torsion Springs

The purpose of this study was to experimentally evaluate the effect of a hinged steel damping system on the shear behavior of a nonductile reinforced concrete frame with an opening. For the experimental test, a total of three full-scale reinforced concrete frame specimens were planned, based on the “no retrofitting” (NR) specimens with non-seismic details. The main research questions were whether the hinged steel damping system is reinforced and whether torsion springs are installed in the hinged steel damping system. From the results of the experiment, the hinged steel damping system (DR specimen) was found to be effective in seismic retrofitting, while isolating the opening of the reinforced concrete (RC) frame, and the torsion spring installed at the hinged connection (DSR specimen) was evaluated to be effective in controlling the amount of deformation of the upper and lower dampers. The strength, stiffness, and energy dissipation capacity of the DSR specimen were slightly improved compared to the DR specimen, and it was confirmed that stress redistribution was induced by the rotational stiffness of the torsion spring installed in the hinge connection between the upper and lower frames.

Sign in / Sign up

Export Citation Format

Share Document