scholarly journals Analysis of the Effects of Soil on the Seismic Energy Responses of an Equipment-Structure System via Substructure Shaking Table Testing

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Lanfang Luo ◽  
Nan Jiang ◽  
Jihong Bi
Keyword(s):  
Seismic Design ◽  
Seismic Energy ◽  
Shaking Table ◽  
Input Energy ◽  
Test Results ◽  
Element Analysis ◽  
Testing Method ◽  
Shaking Table Testing ◽  
Soil Effects ◽  
Substructure Approach

This study investigated the real-time substructure shaking table testing (RTSSTT) of an equipment-structure-soil (ESS) system and the effects of soil on the seismic energy responses of the equipment-structure (ES) subsystem. First, the branch modal substructure approach was employed to derive the formulas needed for the RTSSTT of the ESS system. Then, individual equations for calculating the energy responses of the equipment and the structure were provided. The ES subsystem was adopted as the experimental substructure, whereas the reduced soil model was treated as the numerical substructure when the RTSSTT was performed on the ESS system. The effectiveness of the proposed testing method was demonstrated by comparing the test results with those of the integrated finite element analysis. The energy responses of the ES subsystem in the case of rigid ground (i.e., the ES system) were compared with those considering the effects of soil (i.e., the ESS system). The input energy responses of the ES subsystem were found to decrease significantly after taking the effects of soil into account. Differences due to the soil effects should be considered in the seismic design for the ES system.

scholarly journals Seismic energy response analysis of equipment-structure system via real-time dynamic substructuring shaking table testing

2019 ◽  
Vol 23 (1) ◽  
pp. 37-50 ◽  
Author(s):  
Jihong Bi ◽  
Lanfang Luo ◽  
Nan Jiang
Keyword(s):  
Real Time ◽  
Shaking Table Test ◽  
Seismic Energy ◽  
Shaking Table ◽  
Energy Calculation ◽  
Test Results ◽  
Structure System ◽  
Time Dynamic ◽  
Dynamic Substructuring ◽  
Shaking Table Testing

Dynamic equations are presented that have been deduced for a real-time dynamic substructuring shaking table test of an equipment-structure system, based on the branch mode substructure method. The equipment is adopted as the experimental substructure, which is loaded by the shaking table, while the structure is adopted as the numerical substructure. Real-time data communication occurs between the two substructures during the test. A real-time seismic energy calculation method was proposed for the calculation of energy responses, both in the experimental substructure and the numerical substructure. Taking a representative four-story steel frame/equipment model, real-time dynamic substructuring shaking table tests and overall model tests were executed. The proposed real-time dynamic substructuring shaking table testing method was verified by comparing the test results with shaking table test results for the overall model. The energy responses of each component in the equipment-structure system, using different connection types, also were studied. Changes in the connection types can lead to changes in the energy responses of the equipment-structure system, especially with respect to the equipment. The choice of the connection for the equipment-structure coupled system should take into account the operational performance objective of the equipment.

Shaking table testing of a U-shaped plan building model

1999 ◽  
Vol 26 (6) ◽  
pp. 746-759 ◽  
Author(s):  
Xilin Lu ◽  
Huiyun Zhang ◽  
Zhili Hu ◽  
Wensheng Lu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Model ◽  
Shaking Table Test ◽  
Complex Structure ◽  
Shaking Table ◽  
Scale Model ◽  
Element Analysis ◽  
Building Model ◽  
Shaking Table Testing

In this paper, the dynamic response of a very complex structure which has U-shaped floors and specially shaped slant columns is described. Shaking table tests of a scale model of the building were carried out to verify the safety of the structure and to confirm the results of a finite element analysis of the building. The elastic finite element analysis was done with the help of Super-SAP 93, a well-known structural analysis program. From the shaking table test and the finite element analysis, the dynamic characteristics of the building and its maximum responses were evaluated. In the elastic region, the analytical results were in good agreement with the test results. At the end of this paper, some suggestions are given for engineering design of this type of structures.Key words: shaking table test, structural model, slant column, U-shaped plan, finite element analysis, seismic response.

Test Programs for Degraded Core Shroud and PLR System Piping: Seismic Test Results and Discussion on JSME Rules Application

2008 ◽  
Author(s):  
Kenichi Suzuki ◽  
Hidefumi Kawauchi
Keyword(s):  
Seismic Design ◽  
Vibration Characteristics ◽  
Shaking Table ◽  
Load Control ◽  
Load Testing ◽  
Test Results ◽  
Static Displacement ◽  
Seismic Safety ◽  
Age Related ◽  
Core Shroud

Since the age-related degradation of structures and components in NPPs has been a key issue regarding assessments of seismic safety, JNES initiated seismic test programs in fiscal 2004 for the degraded core shroud and PLR system piping used in old BWR plants. The objectives were to: i) obtain a better understanding of the vibration characteristics and seismic strength of degraded structures and components having cracks due to aging; ii) ensure a margin of seismic design safety by considering age-related cracking; and iii) verify the JSME Rules on Fitness-for-Service for NPPs in Japan. The quasi-static displacement or load control testing of the components of the core shroud and PLR system piping were conducted. The dynamic load testing of combined components were also performed on a shaking table by using an approximately 1/3 scale PLR system piping specimen and a 1/2.5 scale core shroud specimen. All test specimens were designed to contain simulated cracking due to aging, involving cracks assumed to have the maximum allowable size according to the JSME Rules. These test results were discussed by focusing on the effects of cracking on vibration characteristics and seismic strength, and the margin of seismic safety under the JSME Rules.

scholarly journals Shaking Table Tests on a New Antislide Pile under Earthquakes

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Jie Lai ◽  
Yun Liu ◽  
Wei Wang
Keyword(s):  
Seismic Performance ◽  
Earth Pressure ◽  
Seismic Energy ◽  
Shaking Table ◽  
Test Results ◽  
Acceleration Response ◽  
Distribution Form ◽  
Flexible Material ◽  
Seismic Deformation ◽  
Dynamic Earth Pressure

A retaining form of a shock-absorbing antislide pile is proposed for slope engineering. A flexible material (shock-absorption layer) is filled in front of an ordinary antislide pile, which is used to absorb a large amount of seismic energy, thereby decreasing the transmission of seismic energy to the antislide pile. The flexible material thus reduces the seismic response, hence improving the aseismic capacity of the antislide pile. To verify the seismic performance of the shock-absorbing antislide pile, a shaking table contrast test was conducted and the results were compared with those from an ordinary antislide pile. The test results show that the flexible material absorbs a portion of the seismic deformation of the slip mass, decreasing the final displacement of the shock-absorbing antislide pile compared to that of the ordinary antislide pile, thereby reducing the sensitivity of the pile body to the displacement. Under the same conditions, the acceleration response of the slope body at the same height is lower for the shock-absorbing antislide pile than that for the ordinary pile, with the seismic performance of the former being superior to that of the latter. Furthermore, the shock-absorbing antislide pile is similar to the ordinary pile in terms of the dynamic earth pressure distribution form of the pile shaft; however, its value is relatively smaller, and the former exhibits better dynamic stress performance than the latter. The test results should prove useful for aseismic design of slopes.

STUDY ON PERFORMANCE-BASED SEISMIC DESIGN OF SHANGHAI WORLD FINANCIAL CENTER TOWER

2009 ◽  
Vol 03 (04) ◽  
pp. 273-284 ◽  
Author(s):  
XILIN LU ◽  
JIEJIANG ZHU ◽  
YUN ZOU
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Time History ◽  
Shaking Table ◽  
Nonlinear Time History Analysis ◽  
Distribution Analysis ◽  
Element Analysis ◽  
Analytical Studies ◽  
Performance Based Seismic Design ◽  
Financial Center

The height of 101-storey Shanghai World Financial Center Tower is 492 m above ground. According to the philosophy of performance-based seismic design, the seismic performance design objectives and corresponding parameters were proposed for the structure under various seismic actions from frequent to rare earthquake levels. Analytical studies including refined finite element analysis, nonlinear time-history analysis, and stress distribution analysis on the important joint have been conducted to evaluate the structural seismic performance. Along with the analytical studies, shaking table model test and the important joint tests have been carried on in order to verify the accuracies of the analytical results as well as to complement the analytical studies. The results obtained from the studies demonstrate that the structural system meets the performance-based design objectives presented in the paper.

Shaking Table Test of Structure With Reinforced Buckling Restrained Braces

2005 ◽  
Author(s):  
C. S. Tsai ◽  
Wen-Shin Chen ◽  
Kuei-Chi Chen
Keyword(s):  
Shaking Table Test ◽  
Dynamic Testing ◽  
Steel Structure ◽  
Shaking Table ◽  
Test Results ◽  
Buckling Restrained Brace ◽  
Steel Core ◽  
Shaking Table Testing ◽  
Buckling Restrained Braces ◽  
Seismic Loadings

The traditional brace elements will buckle when subjected to severe earthquakes. Many researchers have been trying to overcome this disadvantage of the traditional brace element since 1970’s. Many types of braces have been developed without buckling under large compressive forces called the buckling restrained brace BRB, or unbonded brace. This type brace includes a steel core, a case that encases the steel core and brace projection, and can enhance both the stiffness and hysteretic damping of a structure to resist seismic loadings. Recently, some investigators have carried out the researches focusing on the procedure of designing buckling restrained braces, quasi dynamic testing and the methods of the connection between the buckling restrained brace and main structure. But, these results can not reflect the effects of the structure with buckling restrained braces during earthquakes. Therefore, the shaking table testing should be done to examine the effects of new BRBs on the seismic responses of a structure. In this study, the reinforced buckling restrained braces were installed on a three-story scaled steel structure in Feng Chia University to perform a series of shaking table tests. The test results illustrate that the new unbond braces provide good protection for structures during earthquakes.

Analisa Pengujian Repeatability Timbangan Elektronik dengan Metode Syarat Teknis Timbangan Non Otomatis dan Metode NMI Australia

2019 ◽  
Vol 4 (2) ◽  
pp. 176-183
Author(s):  
Ponco Wali
Keyword(s):  
Research Method ◽  
Test Methods ◽  
Test Results ◽  
Repeat Testing ◽  
Testing Method ◽  
Technical Requirements

Testing repeat electronic scales with non-automatic scales technical requirements so far is fairly long if not using a calculator or computer. The aim of this research is to compare the repeatability testing method of electronic scales using methods according to the technical requirements of non-automatic scales and the Australian NMI method, both of which refer to OIML R76 in determining the validity or cancellation of electronic scales repeatability testing. This research method is done through repeat testing on 3 samples of electronic scales, then on each electronic scale 2 test methods are performed. The conclusion is that the electronic scales repeatability testing uses the non-automatic scales technical requirements method and the Australian NMI method has some differences although both refer to OIML R76. These differences include several points, namely the charge used, the method of adding additions, the formula for determining electronic scales, and different test results. The Australian NMI method is deemed to make it easier and more time efficient compared to the non-automatic weighing technical requirements method.

Finite Element Analysis of Reinforced Concrete Beams with Exterior FRP Shell

2011 ◽  
Vol 243-249 ◽  
pp. 1461-1465
Author(s):  
Chuan Min Zhang ◽  
Chao He Chen ◽  
Ye Fan Chen
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Contact Interface ◽  
Accurate Calculation ◽  
Element Analysis

The paper makes an analysis of the reinforced concrete beams with exterior FRP Shell in Finite Element, and compares it with the test results. The results show that, by means of this model, mechanical properties of reinforced concrete beams with exterior FRP shell can be predicted better. However, the larger the load, the larger deviation between calculated values and test values. Hence, if more accurate calculation is required, issues of contact interface between the reinforced concrete beams and the FRP shell should be taken into consideration.

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