scholarly journals Seismic Performance of Base-Isolated Precast Concrete Shear Wall Structure with AHW Connections

2018 ◽  
Vol 2018 ◽  
pp. 1-22 ◽  
Author(s):  
Wei Wang ◽  
Aiqun Li ◽  
Xingxing Wang
Keyword(s):  
Seismic Performance ◽  
Base Isolation ◽  
Ground Motions ◽  
Precast Concrete ◽  
Shear Wall ◽  
Shaking Table ◽  
Structure Model ◽  
Base Shear ◽  
Seismic Reliability ◽  
Absolute Acceleration

To improve the seismic performance and seismic reliability of precast concrete shear wall (PCSW) structure with improved assembly horizontal wall connections (AHW connections), base isolation technology was proposed to be applied in the PCSW structure. Two 1/4-scaled structure models using the improved AHW connections were constructed: a lead-rubber bearing (LRB) base-isolated PCSW structure model and a base-fixed PCSW structure model. Shaking table tests were conducted on these two models with three strong ground motions to assess the seismic performance of the structures. It was found that the improved AHW connections in the base-isolated PCSW structure are useful and effective and that they fulfil the requirements to be met by the connections to withstand an earthquake. In addition, the maximum absolute acceleration and base shear force of the base-isolated PCSW structure model were less than those of the base-fixed PCSW structure model, and the isolation effect on the absolute acceleration responses and base shear responses increased with increase in the intensity of ground motions. In a word, the seismic performance and seismic reliability of PCSW structures can be effectively improved using base isolation technology. After this investigation, the seismic responses of the base-isolated PCSW structure model were numerically simulated using OpenSees software. There was a reasonable agreement between the numerically simulated results and test results; thus, the numerical simulation method and analysis model used for the base-isolated PCSW structure model were verified.

Effect of Connection Deficiency on Seismic Performance of Precast Concrete Shear Wall-Frame Structures

2019 ◽  
Vol 13 (03n04) ◽  
pp. 1940005 ◽  
Author(s):  
Zijian Cao ◽  
Quanwang Li
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Precast Concrete ◽  
Shear Wall ◽  
Frame Structure ◽  
Occurrence Rate ◽  
Point Estimate ◽  
Seismic Reliability ◽  
Point Estimate Method ◽  
Seismic Design Code

The quality of precast concrete (PC) component connections is one of the main factors that affect the seismic reliability of PC structures. China is developing PC structures in high seismic regions, and it is important to assess the effect of connection deficiency on seismic performance of PC structures. This paper presents a comprehensive method to assess the seismic reliability of PC shear wall-frame structure whose wall panels are assembled through grouted sleeve connections which are susceptible to insufficient grouting. Considering the uncertainties associated with the number, locations and loading behavior of defected sleeve connections, the probabilistic behavior of PC shear wall with defected connections is estimated through point estimate method using simulation results of the experiment-validated finite element model. Then, a simple shear wall-frame building, designed for the seismic intensity of 8 according to China’s seismic design code, is modeled on platform of OpenSees. Static pushover analyses and seismic fragility analyses are performed on the structure with different degrees of connection deficiency, to investigate the effect of deficiency occurrence rate on seismic performance. The seismic performance is significantly affected by connection deficiencies; it no longer meets the requirement of seismic design as the deficiency occurrence rate exceeds 25%, so the occurrence rate of defected connections should be controlled carefully in construction site.

scholarly journals Isolating system using U Shaped steel damper

2021 ◽  
Vol 309 ◽  
pp. 01136
Author(s):  
Siripuram Vamshisheela ◽  
Atulkumar Manchalwar
Keyword(s):  
Base Isolation ◽  
Ground Motions ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Base Shear ◽  
Energy Device ◽  
History Analysis ◽  
Structural Responses ◽  
Nonlinear Time History ◽  
Story Building

In this work the performance of U-Shaped Steel Isolator is evaluated for a 5-story building subjected to seismic and blast vibrations. The structure is analysed using SAP 2000 software and a nonlinear time history analysis is carried out. The effectiveness of using base isolation is studied by comparing the structural responses of the building with isolator and without isolator and noticeable difference was observed. As the U-Shaped isolator absorbs the energy in all directions, it effectively controls the structural responses. In this study, the building is subjected to four different seismic and four different blast induced ground motions. It was observed that by the use of supplementary energy device there is reduction in top story acceleration, base shear and less deformation in the structure. This study concludes that the use of isolator has been effective in minimizing structural responses.

The Material Behavior and Isolation Benefits of Ball Pendulum System

2006 ◽  
Author(s):  
C. S. Tsai ◽  
Ching-Pei Tsou ◽  
Yung-Chang Lin ◽  
Mei-Ju Chen ◽  
Wen-Shin Chen
Keyword(s):  
Base Isolation ◽  
Ground Motions ◽  
Material Behavior ◽  
Shaking Table ◽  
Ground Acceleration ◽  
Isolation System ◽  
Pendulum System ◽  
Damping Material ◽  
Base Isolation System ◽  
Damping Materials

Earthquake ground motions often result in significant seismic disasters. Strong ground motions will not only cause damage, but may also cause the collapse of structures. People have to face up the suffering from the earthquake damage, and the indirect loss which may be more serious than the damage itself. For example, the antique breaks in museum, and the equipment damages in hi-tech industries are often in huge loss. Therefore, in addition to promoting the earthquake-resistant capacity of a structure, it is also important to ensure the safety of the ancient valuable objects and the instruments in structures. For this reason, this study is aimed at a new damped rolling type base isolation system named the ball pendulum system (BPS) to be installed under the motion sensitive equipment and proceeding all related studies. The isolation device can isolate earthquake from buildings or equipments in any direction by rolling motions and damping materials. This study has conducted a series of component tests and shaking table tests for examining the behaviors of materials and earthquake proof benefits. From the experiment results, it is found that this device can reduce more than 80% of acceleration response under earthquakes with peak ground acceleration of 450 gal. So, the new rolling isolation system with a damping material can be recognized as a feasible and promising way in mitigating the seismic response of equipment.

Application of FBG Sensors in Shaking Table Test of Frame-Shear Wall Structure Model

2010 ◽  
Vol 163-167 ◽  
pp. 2653-2656
Author(s):  
Li Sun ◽  
Hai Xia Zhang ◽  
De Zhi Liang ◽  
Zhe Li
Keyword(s):  
Transmission Lines ◽  
Shaking Table Test ◽  
Shear Wall ◽  
Shaking Table ◽  
Wall Structure ◽  
Structure Model ◽  
Reinforced Concrete Frame ◽  
Wall Model ◽  
Concrete Frame ◽  
Fbg Sensors

In this paper, FBG sensors are used to monitor and analyze the response of reinforced concrete frame-shear wall model in shaking table test in order to study the placement of sensors and the protection of the transmission lines. Based on the experiment data, the destructive mode and dynamic characteristics in earthquake are obtained through (by) analyzing the dynamic response of the structures. The experiment results show that using FBG is effective in monitoring the structures.

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