Shaking Table Test on Seismic Performance of L- and V-Sectioned Reinforced Concrete Columns

2015 ◽  
Vol 09 (04) ◽  
pp. 1550010
Author(s):  
Xuan-Huy Nguyen ◽  
Xuan-Dat Pham ◽  
Xuan-Chieu Luong
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Shaking Table Test ◽  
Absorption Capacity ◽  
Shaking Table ◽  
Experimental Program ◽  
Ground Acceleration ◽  
Cross Sectional ◽  
Response Characteristics ◽  
Current Test

This paper presents an experimental program to investigate the effects of cross-sectional shape on the seismic performance of irregularly shaped reinforced concrete (RC) columns. Five groups of specimens that were one-quarter of typical columns of a prototype medium-rise building were tested to failure using shaking table. The loading procedure was successively increasing peak ground acceleration until the test structure collapsed. The specimens were designed with the same cross-section area but different flange width and flange thickness. The seismic response characteristics of all specimens such as drift capacity, energy absorption capacity and failure mechanisms of each specimen group are evaluated, compared and discussed in detail. Based on the current test data, design recommendation is provided to assist engineers in designing such irregularly shaped columns.

Shaking Table Test on Unreinforced Stone Masonry Pagoda

2012 ◽  
Vol 166-169 ◽  
pp. 730-733 ◽  
Author(s):  
Fei Zhu ◽  
Feng Lai Wang ◽  
Xu Jie Sun ◽  
Y. Zhao
Keyword(s):  
Dynamic Behavior ◽  
Seismic Performance ◽  
Seismic Design ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Cultural Value ◽  
Scale Model ◽  
Stone Masonry ◽  
Experimental Program ◽  
Ancient China

Unreinforced stone masonry pagodas have great cultural value and should be detailed investigation its mechanical properties. These buildings were not designed to resist earthquakes in ancient China, at least not in the way of current methods. The objectives of this research were to understand the dynamic behavior of unreinforced stone masonry pagoda and its seismic performance. To accomplish these, a 1/12 scale model of China Dinosaurs Pagoda was constructed and tested on shaking table. The octangle model height is 3.96m, with aspect ratio of height to width is 2.93, both parameters exceed the stipulated limit of Code for Seismic Design of Building. The model built with the stones and motars similar to the prototype materials and the arrangements. Its dynamic behavior and seismic performance were tested on the shaking table towards the free vibration and three earthquake waves. The experimental program adopted in the research is explained in this paper.

Seismic performance of a controlled rocking reinforced concrete frame

2016 ◽  
Vol 20 (1) ◽  
pp. 4-17 ◽  
Author(s):  
Liang Lu ◽  
Xia Liu ◽  
Junjie Chen ◽  
Xilin Lu
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Shaking Table Test ◽  
Joint Stiffness ◽  
Shaking Table ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Metallic Dampers ◽  
Reversed Cyclic

A controlled rocking reinforced concrete frame is a new type of vibration control structure system that uses resilient rocking columns and joints. The effects of earthquakes on this type of structure are reduced by weakening the overall stiffness, whereas the lateral displacement is controlled by the energy-dissipation dampers introduced into the structure. Two tests were performed for research: the reversed cyclic loading test and shaking table test. Two single-span single-story controlled rocking reinforced concrete frames were designed for reversed cyclic loading tests. These tests (i.e. a column-base joint stiffness test, beam-column joint stiffness test, and frame stiffness test) were performed under different conditions. The mechanical analysis model of the rocking joints was derived from the test results. With the parameters obtained from the cyclic tests, a numerical simulation method that established the analytical model of the controlled rocking reinforced concrete frame using the program ABAQUS is proposed, and the dynamic time-history analysis results of the controlled rocking reinforced concrete frame and of the conventional approach are compared to investigate the vibration control effect and seismic performance of the controlled rocking reinforced concrete frame. In addition, the inter-story drift could be effectively controlled by adding metallic dampers, and the shaking table test models of the controlled rocking reinforced concrete frame with metallic dampers were designed and constructed. The comparison of the results of the numerical analysis and the shaking table test demonstrates that the model building of the controlled rocking reinforced concrete frame structure is efficient and that the controlled rocking reinforced concrete frame exhibits an excellent seismic performance.

Shaking table test of reinforced concrete coupled shear walls with single layer of web reinforcement and inclined steel bars

2018 ◽  
Vol 21 (15) ◽  
pp. 2282-2298 ◽  
Author(s):  
Jianwei Zhang ◽  
Wenbin Zheng ◽  
Cheng Yu ◽  
Wanlin Cao
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Shaking Table Test ◽  
Single Layer ◽  
Shear Walls ◽  
Shaking Table ◽  
Large Hole ◽  
Steel Bars ◽  
Web Reinforcement ◽  
Opening Ratio

In this study, five 1/4 scaled shaking table tests were conducted to investigate the seismic performance of reinforced concrete coupled shear walls with single layer of web reinforcement and inclined steel bars. The five tested coupled shear walls included three models with normal opening ratio (19%) and two models with large hole ratio (27%). The three models with normal opening included one model with single layer of web reinforcement, two models with single layer of web reinforcement and 75° inclined steel bars in the limbs’ web or at the bottom. Two reinforced concrete coupled shear walls with large hole and single row of reinforcements also were tested with inclined reinforcements or without them. The dynamic characteristics, dynamic response, and failure mode of each model were compared and analyzed. The test and analysis results demonstrate that the inclined steel bars are identified as an efficient means of limiting overall deformation, increasing energy dissipation, and reducing the possible damage by earthquake for reinforced concrete coupled shear walls with single layer of web reinforcement. Thus, reinforced concrete coupled shear walls with inclined steel bars have better seismic performance than reinforced concrete coupled shear walls without inclined steel bars. With appropriate design, reinforced concrete coupled shear walls with single layer of web reinforcement and inclined steel bars can be applied in multi-story buildings.

scholarly journals Seismic Performance of Deposit Slopes With Underlying Bedrock Before and After Reinforcement by Stabilising Piles

2021 ◽  
Author(s):  
Zhiliang Sun ◽  
Kong Lingwei ◽  
Bai Wei ◽  
Wang Yong
Keyword(s):  
Seismic Performance ◽  
Seismic Waves ◽  
Bending Moment ◽  
Resultant Force ◽  
Shaking Table ◽  
Slope Instability ◽  
Dynamic Responses ◽  
Seismic Excitation ◽  
Ground Acceleration ◽  
Response Characteristics

Abstract The seismic performance of stabilising piles used to reinforce underlying bedrock in a deposit slope is a complex soil-structure interaction problem, on which there is limited design guidance on the optimum use of a single row of rock-socketed piles to reinforce such slopes. Two centrifuge shaking-table model tests at a geometric scale of 1:50 were conducted to ascertain the dynamic responses of the underlying bedrock deposit slopes without and with the use of stabilising piles during an earthquake. Multi-stage seismic waves with various peak accelerations were applied from the bottom of each model. Under seismic excitation, the differences in the response accelerations between the deposit and bedrock increase significantly with the increase in amplitude of the input seismic waves. The two are prone to uncoordinated movement, which leads to slope instability. Setting stabilising piles reduces the crest settlement and angular deformation and changes the natural frequency of the slope crest. The presence of the rock-socketed stabilising piles can bridge the uncoordinated movement of the bedrock and the overlying deposit to some extent. According to the mobilised pile bending moment, shear force, lateral pile-soil load distribution, and pile displacement, the dynamic response characteristics of stabilising piles under continuous multi-level seismic excitation were analysed. The resultant force arising from a distributed load increment on the piles caused by an earthquake is mainly concentrated in the upper part (the point of action of the resultant force is 1.54m below the slope surface). With increases in the peak ground acceleration (PGA) of the input motion, the resistance of the bedrock in front of the stabilising piles increases; moreover, with the increase of PGA, the peak resistance under the bedrock surface of the stabilising piles gradually moves downwards. This finding indicates that the strong seismic motion significantly changes the embedded working state of the stabilising pile.

Shaking Table Test of Eccentric Reinforced Concrete Frame-Shear Wall Structure Model

2014 ◽  
Vol 584-586 ◽  
pp. 1247-1250
Author(s):  
Bing Li ◽  
Li Na Lu ◽  
Hai Tao Lv ◽  
Xu Fang Li
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Shaking Table Test ◽  
Shear Wall ◽  
Simulation Software ◽  
Shaking Table ◽  
Wall Structure ◽  
Reinforced Concrete Frame ◽  
Element Analysis ◽  
High Rise

Reinforced concrete eccentric frame-shear wall structure has been widely used in engineering. However, this structure is mainly used for high-rise structure, and it is difficult to obtain accurate earthquake response of structure through experimental study. Therefore, simulation software needs to be used for study on seismic performance of high-rise structures. This paper produces useful conclusions for the project through shaking table test and the simulation of seismic performance provided by ANSYS finite element analysis software.

Shaking Table Test on Seismic Performance of Ceiling without Braces and Artificial Spacing to Surrounding Object

2015 ◽  
Vol 104 (1) ◽  
pp. 1-8
Author(s):  
Kenichi Tahara ◽  
Yasuhito Sasaki ◽  
Yukihiro Sato ◽  
Satoshi Sasaki ◽  
Shojiro Motoyui
Keyword(s):  
Seismic Performance ◽  
Shaking Table Test ◽  
Shaking Table

scholarly journals Evaluation of Seismic Demand for Substandard Reinforced Concrete Structures

2018 ◽  
Vol 12 (1) ◽  
pp. 9-33
Author(s):  
Nicholas Kyriakides ◽  
Ahmad Sohaib ◽  
Kypros Pilakoutas ◽  
Kyriakos Neocleous ◽  
Christis Chrysostomou ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Performance Prediction ◽  
Brittle Failure ◽  
Failure Modes ◽  
Shaking Table ◽  
Equivalent Linearization ◽  
Diagram Method ◽  
Capacity Curves ◽  
Non Linear

Background: Reinforced Concrete (RC) buildings with no seismic design exhibit degrading behaviour under severe seismic loading due to non-ductile brittle failure modes. The seismic performance of such substandard structures can be predicted using existing capacity demand diagram methods through the idealization of the non-linear capacity curve of the degrading system, and its comparison with a reduced earthquake demand spectrum. Objective: Modern non-linear static methods for derivation of capacity curves incorporate idealization assumptions that are too simplistic and do not apply for sub-standard buildings. The conventional idealisation procedures cannot maintain the true strength degradation behaviour of such structures in the post-peak part, and thus may lead to significant errors in seismic performance prediction especially in the cases of brittle failure modes dominating the response. Method: In order to increase the accuracy of the prediction, an alternative idealisation procedure using equivalent elastic perfectly plastic systems is proposed herein that can be used in conjunction with any capacity demand diagram method. Results: Moreover, the performance of this improved equivalent linearization procedure in predicting the response of an RC frame is assessed herein. Conclusion: This improved idealization procedure has been proven to reduce the error in the seismic performance prediction as compared to seismic shaking table test results [1] and will be further investigated probabilistically herein.

scholarly journals Effect of Soil Box Boundary Conditions on Dynamic Behavior of Model Soil in 1 g Shaking Table Test

2020 ◽  
Vol 10 (13) ◽  
pp. 4642
Author(s):  
Hoyeon Kim ◽  
Daehyeon Kim ◽  
Yonghee Lee ◽  
Haksung Kim
Keyword(s):  
Boundary Conditions ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Boundary Effects ◽  
Soil Behavior ◽  
Ground Acceleration ◽  
Various Boundary Conditions ◽  
Model Soil ◽  
Shear Box ◽  
Laminar Shear

In order to evaluate the effects of soil box boundary conditions on the dynamic soil behavior, the Rigid Box (RB) and the Laminar Shear box (LSB) were constructed and 1 g shaking table tests were carried out for various boundary conditions. The boundary effects of the RB and the LSB were compared. To reduce the boundary effects of the RB, sponges, 5 cm, 10 cm, and 15 cm in thickness, were attached to the two end sides of the RB. A model soil was constructed on flat ground, and the acceleration and amplification occurring in the center of the soil were analyzed by spectrum and peak ground acceleration. Compared with the RB, the center and wall accelerations of LSB were very close to each other. This implies that the LSB can better simulate the behavior of the infinite half space than the RB.

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