Experimental Investigation on the Seismic Performance of a Chinese Traditional Wooden Pagoda

2016 ◽  
Vol 858 ◽  
pp. 119-124 ◽  
Author(s):  
Ya Jie Wu ◽  
Xiao Bin Song ◽  
Lie Luo
Keyword(s):  
Seismic Performance ◽  
Dynamic Characteristics ◽  
Damping Ratio ◽  
Residual Deformation ◽  
Shaking Table ◽  
Scale Model ◽  
Amplification Coefficient ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
Acceleration Amplification

To investigate the seismic performance of the traditional Chinese timber structure, a one-fifth scale model of a seven-story pavilion-style wooden pagoda was tested on a shaking table. An artificial wave and two natural earthquake waves were used. Different excitation intensities ranging from frequent-met level to rare-met level of 7 degree as specified in Chinese code were mainly considered. White noise excitations were applied to obtain the change of the dynamic characteristics of the model. The identification results of dynamic characteristics indicated that the model’s damping ratio was more than 0.1, and the first natural frequency decreased by 17% with the corresponding damping ratio increased by 46% after the earthquake excitations. Typical components which including ludous and sandous were observed with splitting perpendicular- to-wood-grain under rare-met earthquake excitations, but other structural members were not found noticeable damage. The maximum acceleration amplification coefficient of the top point was 2.46, and the maximum displacement was 239 mm. Small residual deformation was detected under the rare-met earthquake excitations. The experiment implied the extraordinary seismic performance of such kind of structures.

Design, Manufacturing and Testing of Small Shaking Table

2018 ◽  
Vol 7 (4.20) ◽  
pp. 426 ◽  
Author(s):  
Asad H. Humaish ◽  
Mohammed S. Shamkhi ◽  
Thualfiqar K. Al-Hachami
Keyword(s):  
Dynamic Response ◽  
Shaking Table ◽  
Single Frequency ◽  
Main Body ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
Geotechnical Centrifuge ◽  
Concrete Gravity Dams ◽  
Sinusoidal Waveform ◽  
Model Weight

The seismic performance and the dynamic response of concrete gravity dams can be verified by several techniques. Both geotechnical centrifuge apparatus (under N-g values) and shaking table (under 1-g) are the commonly used techniques in the world. This paper deals with designing, manufacturing, and testing of small shaking table to investigate different geotechnical and engineering problems. The main body of the designed shaking table consists of steel frame (local iron) manufactured as a hollow box with steel plate, 6mm in thickness and one-direction movable platform (as a basket carrying the container of the model).  Inside this main box, all the mechanical parts that work as one system to generate the motion of the seismic wave with an acceleration that needed to the test.  The facilities of this shaking table, the movable base has a dimension of 0.8m x1.2m and the platform mass approximately 2 kN, the maximum allowable model weight of 10kN, the range of frequency from 0 to 20 Hz, the maximum acceleration amplitude of 1.2g and maximum displacement of 14mm. It can simulate only the single frequency motion (i.e. sinusoidal wave). The measured accelerations at different soil model level for the tested shaker under 0.6g sinusoidal waveform gave a reasonable prediction for the dynamic response and the amplification characteristics.  

scholarly journals Shaking Table Model Test and Seismic Performance Analysis of a High-Rise RC Shear Wall Structure

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Shujin Li ◽  
Cai Wu ◽  
Fan Kong
Keyword(s):  
Seismic Performance ◽  
Model Test ◽  
Shaking Table Test ◽  
Technical Specification ◽  
Shaking Table ◽  
Scale Model ◽  
Wall Structure ◽  
High Rise ◽  
Table Model ◽  
Shaking Table Model Test

A building developed by Wuhan Shimao Group in Wuhan, China, is a high-rise residence with 56 stories near the Yangtze River. The building is a reinforced concrete structure, featuring with a nonregular T-type plane and a height 179.6 m, which is out of the restrictions specified by the China Technical Specification for Concrete Structures of Tall Building (JGJ3-2010). To investigate its seismic performance, a shaking table test with a 1/30 scale model is carried out in Structural Laboratory in Wuhan University of Technology. The dynamic characteristics and the responses of the model subject to different seismic intensities are investigated via the analyzing of shaking table test data and the observed cracking pattern of the scaled model. Finite element analysis of the shaking table model is also established, and the results are coincident well with the test. An autoregressive method is also presented to identify the damage of the structure after suffering from different waves, and the results coincide well with the test and numerical simulation. The shaking table model test, numerical analysis, and damage identification prove that this building is well designed and can be safely put into use. Suggestions and measures to improve the seismic performance of structures are also presented.

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.

Shaking table test on single segment prefabricated concrete bridge pier connected by grouting sleeve

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Junming Xu ◽  
Yanmin Jia ◽  
Dongwei Liang
Keyword(s):  
Finite Element ◽  
Seismic Performance ◽  
Shaking Table ◽  
Scale Model ◽  
Loading Test ◽  
Continuous Increase ◽  
Content Type ◽  
Finite Element Software ◽  
Crack Penetration ◽  
Strain Responses

PurposePrefabricated pier technology has the advantages of quick construction time, relatively little traffic interference and relatively small environmental impact. However, its applicability under earthquake conditions is not yet fully understood. The seismic performance and influence parameters of a prefabricated concrete pier connected by embedded grouting sleeve (GS) in a pile cap are investigated in this study.Design/methodology/approachTwo prefabricated pier scale model specimens with different reinforcement anchorage lengths and two comparative cast-in-place (CIP) pier model specimens are designed and manufactured for a seismic simulation shaking table. With the continuous increase of input ground motion strength, the changes in basic dynamic characteristics, damage development, acceleration and displacement variation laws, and pier bottom strain responses are compared among the specimen. The finite element software ABAQUS is used to simulate the test pier.FindingsThe crack location of the two prefabricated pier specimens is almost the same as that of the CIP pier specimens; CIP pier specimens show more penetrated cracks than prefabricated pier specimens, as well as an earlier crack penetration time. The acceleration, displacement and strain response of the CIP pier specimens are more affected by earthquake activity than those of the prefabricated pier specimens. The acceleration, displacement and strain responses of the two prefabricated piers are nearly identical. The finite element results are in close agreement with the acceleration and displacement response data collected from the test, which verifies the feasibility of the finite element model established in ABAQUS.Originality/valueA GS connection method is adopted for the prefabricated pier, and on the premise of meeting the minimum reinforcement anchorage length required by the code, this study explores the influences of different reinforcement anchorage lengths on the seismic performance of prefabricated piers in high-intensity areas. A shaking table loading test is used to simulate the real changes of the structure under the earthquake. This work may provide a valuable reference for the design and seismic performance analysis of prefabricated pier, particularly in terms of seismic stability.

A shaking table substructure testing method for the structural seismic evaluation considering soil-structure interactions

2020 ◽  
Vol 23 (14) ◽  
pp. 3024-3036
Author(s):  
Guoshan Xu ◽  
Yong Ding ◽  
Jingfeng Xu ◽  
Yongsheng Chen ◽  
Bin Wu
Keyword(s):  
Seismic Performance ◽  
Storage Tank ◽  
Soil Structure ◽  
Experimental Results ◽  
Shaking Table ◽  
Seismic Evaluation ◽  
Maximum Acceleration ◽  
Foundation Soil ◽  
Testing Method ◽  
Liquid Height

A novel shaking table substructure testing method that includes interaction forces determined by actuator forces and shaking table dynamic parameters is proposed and validated. The seismic performance of a storage tank that incorporates soil-structure interactions is investigated by the method proposed in this article. The experimental results show that the proposed shaking table substructure testing method is an efficient alternative method of evaluating the seismic performance of a storage tank that incorporates soil-structure interactions. The experimental results show that the influence of the soil-structure interactions increases as the stiffness of the foundation soil decreases, which was demonstrated by the results showing that the displacement and acceleration responses of the storage tank decrease as the stiffness of the foundation soil decreases. Moreover, the influence of the soil-structure interactions increases as the liquid height increases, which was illustrated by the decreased displacement responses of the storage tank with increases in the liquid height. The maximum acceleration response of the storage tank occurred at the liquid surface height.

Theoretical design and experimental verification of a 1/50 scale model of a quayside container crane

2011 ◽  
Vol 226 (6) ◽  
pp. 1644-1662 ◽  
Author(s):  
Y L Jin ◽  
Z G Li
Keyword(s):  
Dynamic Characteristics ◽  
Large Scale ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Scale Model ◽  
Engineering Structures ◽  
Scaled Model ◽  
Container Crane ◽  
Comparison Results ◽  
Quayside Container Crane

An effective way to study the dynamic performances and seismic behaviours of large-scale engineering structures is using a scale model. This article aims to develop a geometric-scaled model of the 1/50 for a quayside container crane such that the dynamic characteristics of the prototype can be accurately predicted from the relevant features of this scale model. To this end, a detailed design process for the main components of a 1/50 scale model of the quayside container crane was first presented according to the similitude law. Then, a hammering modal test and the Ling dynamic system shaking table test were successively carried out to obtain the dynamic characteristics of this 1/50 scale model. Furthermore, the experimental results were compared with the computed results of the prototype obtained from numerical simulation and they showed a fairly good agreement. From the comparison results, it can be seen that the model design is instructive enough to provide some valuable information and practical use for professionals and researchers involved in the design of large-scale port facilities.

Seismic response of a light steel structure integrated building with steel mortise–tenon connections

2018 ◽  
Vol 22 (5) ◽  
pp. 1225-1237 ◽  
Author(s):  
Nianqiang Zhou ◽  
Weixing Shi ◽  
Jiazeng Shang
Keyword(s):  
Shaking Table Test ◽  
Damping Ratio ◽  
Dynamic Performance ◽  
Steel Structure ◽  
Shaking Table ◽  
Scale Model ◽  
Test Model ◽  
Seismic Behaviour ◽  
Ground Acceleration ◽  
House Structure

Mortise–tenon joints play a crucial role in traditional timber structures to resist service and earthquake loading. In this work, the steel mortise–tenon connection from a traditional timber house was extracted and developed for a lightweight steel structure integrated building. This article presents a study on the dynamic performance of an integrated steel house with steel mortise–tenon connections. A shaking table test was conducted with a full-scale model and various excitation intensities. Various parameters, including the natural frequency, the equivalent stiffness of the structure, the structural damping ratio, the acceleration response and the displacement response, were analysed and discussed. In the test, the model frequencies decreased from 15.19 to less than 13.38 Hz, while the damping ratio increased by 32.6%. The test model survived all the input earthquake excitations (peak ground acceleration of up to 1.0 g) with only minor damage, indicating the good seismic resilience of the building. The test results demonstrate that the integrated house structure with steel mortise–tenon connections is a good solution for withstanding earthquakes. An integrated structure bounded by a steel mortise–tenon system with proper design typically exhibits good seismic behaviour and can resist earthquake under different seismic levels in practice.

Acceleration Data Acquisition and Analysis Method of Shaking Table Test

2015 ◽  
Vol 724 ◽  
pp. 205-212 ◽  
Author(s):  
Shao Feng Chai ◽  
Ping Wang ◽  
Zhi Jian Wu ◽  
Jun Wang ◽  
Gao Feng Che
Keyword(s):  
Data Processing ◽  
Test Data ◽  
Shaking Table Test ◽  
Damping Ratio ◽  
Shaking Table ◽  
Amplification Coefficient ◽  
Response Analysis ◽  
Analysis Method ◽  
Stability And Instability ◽  
Sine Sweep

Shaking table test is an important means of simulated earthquake in laboratory, slope shaking table test data provide a scientific basis for analysis of dynamic stability and instability mechanism of slopes. Sine vibration table test data processing is different from general frequency domain analysis method, need real-time data processing in time domain. Taking the sine sweep test conditions, which is one of the conditions in "Earthquake landslide and slope prevention and control technology research on shaking table test", as an example. Describes the layout of sensors in shaking table test and the reasons; Sine sweep test load and aim; and listed the steps and methods of the sine sweep test in data processing; Through the processing and analysis of test data identified the vibration frequency of model and shaking table system is 30Hz, damping ratio is 2.06%; Analysis and calculation of the different sections of the slope and position of the amplification coefficient. A methodological guidance for shaking table test and dynamic response analysis of the slope is provided.

scholarly journals Dynamic Characteristics of Saturated Silty Soil Ground Treated by Stone Column Composite Foundation

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Yongxiang Zhan ◽  
Guanlu Jiang ◽  
Hailin Yao
Keyword(s):  
Performance Improvement ◽  
Shear Displacement ◽  
Composite Foundation ◽  
Shaking Table ◽  
Stone Column ◽  
Amplification Coefficient ◽  
Silty Soil ◽  
Acceleration Amplification ◽  
Table Model ◽  
Shaking Table Model Test

A shaking table model test was carried out to develop an understanding of the performance improvement of saturated silty soil ground using stone column composite foundation as reinforcement. It is found that at less than 0.161 g loading acceleration, soil between piles has not yet been liquefied, the response acceleration scarcely enlarges, and the shear displacement almost does not appear in silty soil. At 0.252 g loading acceleration, as a result of liquefaction of soil between piles, the response acceleration increases rapidly and reaches its peak, and the shear displacement of silty soil increases significantly. At 0.325 g loading acceleration, the integral rigidity of foundation decreases greatly, which reduces its capability of vibration transmission and result in the response acceleration amplification coefficient is less than that at the former loading acceleration, but the shear displacement of silty soil further increases. The stone column composite foundation can greatly reduce both the shear displacement and the settlement of ground compared with untreated foundation. Under the condition of 7-degree seismic fortification, the design meets seismic resistance requirements.

Experimental seismic response of a column-and-tie wooden structure

2019 ◽  
Vol 22 (8) ◽  
pp. 1909-1922 ◽  
Author(s):  
Jianyang Xue ◽  
Dan Xu ◽  
Liangjie Qi
Keyword(s):  
Concrete Slab ◽  
Damping Ratio ◽  
Seismic Energy ◽  
Shaking Table ◽  
Scale Model ◽  
Earthquake Excitation ◽  
Seismic Line ◽  
Wooden Structure ◽  
Sliding Isolation ◽  
And Performance

A half-scale model of a two-story and two-span column-and-tie wooden structure was fabricated and tested on the shaking table to assess the seismic behavior of the structure under various base input intensities. The dynamic characteristics, acceleration response, displacement response and shear force distributions were measured and assessed. Besides, the cumulative hysteretic energy dissipation performance of the model was analyzed. The test results revealed that with the increasing magnitude of earthquake excitation, the natural frequency and stiffness of the model structure decreased, and the damping ratio increased. The acceleration amplification factor of each layer fluctuated between 0.286 and 1.383. The wooden house is directly placed on the concrete slab, which to some extent plays a role in sliding isolation. The model dissipates seismic energy mainly by the first layer. When the earthquake excitation was 0.22 g and 0.40 g, the model responded seriously, and the maximum inter-story drifts of the model was 1/65 and 1/35, respectively. When the earthquake input reached 0.5 g, the structure did not collapse. This demonstrates that the wooden structure has strong capability of lateral resistance and deformation resistance. Furthermore, the wooden wallboard component acts as the first seismic line under earthquake excitation, meeting the characteristics of “A wall falls down, while the house will not collapse.” This article can help guide the seismic design and performance assessment of traditional wooden constructions.

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