• Title, Summary, Keyword: pseudo-dynamic test

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Limited Ductile Capacity of Reinforced Concrete Bridge Pier with Longitudinal Steel Lap-splicing by Pseudo Dynamic Test (유사동적 실험에 의한 철근콘크리트 교각의 주철근 겹이음에 따른 한정연성능력)

  • 박창규;박진영;조대연;이대형;정영수
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.885-890
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    • 2002
  • Pseudo dynamic test is an on-line computer control method to achieve the realism of shaking table test with the economy and versatility of the conventional quasi-static approach. Pseudo dynamic tests of four full-size RC bridge piers have been carried out to investigate their seismic performance. For the purpose of precise evaluation, the experimental investigation was conducted to study the seismic performance of the real size specimen, which is constructed for highway bridge piers in Korean peninsula. Since it is believed that Korea belongs to the moderate seismicity region, three test specimens were designed in accordance with limited ductility design concept. Another one test specimen was nonseismically designed according to a conventional code. Important test parameters were transverse reinforcement and lap splicing. Lap splicing was frequently used in the plastic hinge region of many bridge columns. Furthermore, the seismic design code is not present about lap splice in Korean Roadway Bridge Design Code. The results show that specimens designed according to the limited ductility design concept exhibit higher seismic resistance. Specimens with longitudinal steel lap splice in the plastic hinge region appeared to significantly fail at low ductility level.

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Seismic Performance of Circular Reinforced Concrete Bridge Piera By Pseudo-Dynamic Test (Pseudo-dynamic실험에 의한 원형충진 RC 교각의 내진거동)

  • 조창백;소진호;빅종협;정영수
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.464-469
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    • 2000
  • Since the occurrence of 1995 Kobe earthquake, there have been much concern about seismic design for various infrastructures, inclusive of bridge structures. This research aims at evaluating the seismic performance of the existing R/C bridge piers, which were nonseismically or seismically designed in accordance with the provision of Korea Highway Design Specification. Further experimental investigations have been doing to figure out the retrofitting effects of nonseismic R/C bridge piers confined with glass fiber at the plastic hinge zone. Pseudo-dynamic tests have been carried out in nine scaled R/C column specimens to investigate their hysteretic behavior under earthquake loading. Test parameters are axial load, input ground motion confinement steel ratio, glass fiber and etc.

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Pseudo-Dynamic Tests on Base-Isolated Liquid Storage Tanks (기초분리(基礎分離)된 액체저장(液體貯藏)탱크의 유사(類似) 동적실험(動的實驗))

  • Kim, Nam Sik;Lee, Dong Guen
    • Journal of The Korean Society of Civil Engineers
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    • v.13 no.4
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    • pp.51-64
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    • 1993
  • Base-isolated liquid storage tanks under seismic loading were tested by the Pseudo-dynamic test method. Substructuring technique in which a mixed integration method was adopted and the liquid tanks were simply modeled as a discrete system. This study gave experimental verification on the advantage of mounting the liquid tanks on base isolators in order to reduce the hydrodynamic forces on the tank wall.

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Pseudo-Dynamic Test of Circular Reinforced Concrete Bridge Piers for Seismic Performance (원형 콘크리트 교각의 내진거동에 관한 유사동적 실험)

  • 박종협
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • pp.409-416
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    • 2000
  • This research aims at evaluating the seismic performance of the existing R/C bridge piers which were nonseismically or seismically designed in accordance with the provision of Korea Highway Design Specification. Further experimental investigations have been doing to figure out the retrofitting effects of nonseismic R/C bridge piers confined with glass fiber at the plastic hinge zone. Pseudo-dynamic tests have been carried out on nine scaled R/C column specimens to investigate their hysteretic behavior under earthquake loading, Test parameters are axial load input ground motion confinement steel ration glass fiber and etc,

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Pseudo-dynamic and cyclic loading tests on a steel-concrete vertical hybrid structure

  • Wang, Bo;Wu, Tao;Dai, Huijuan;Bai, Guoliang;Wu, Jian
    • Earthquakes and Structures
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    • v.17 no.4
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    • pp.399-409
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    • 2019
  • This paper presents the experimental investigations on the seismic performance of a peculiar steel-concrete vertical hybrid structural system referred to as steel truss-RC tubular column hybrid structure. It is typically applied as the supporting structural system to house air-cooled condensers in thermal power plants (TPPs). Firstly, pseudo-dynamic tests (PDTs) are performed on a scaled substructure to investigate the seismic performance of this hybrid structure under different hazard levels. The deformation performance, deterioration behavior and energy dissipation characteristics are analyzed. Then, a cyclic loading test is conducted after the final loading case of PDTs to verify the ultimate seismic resistant capacity of this hybrid structure. Finally, the failure mechanism is discussed through mechanical analysis based on the test results. The research results indicate that the steel truss-RC tubular column hybrid structure is an anti-seismic structural system with single-fortification line. RC tubular columns are the main energy dissipated components. The truss-to-column connections are the structural weak parts. In general, it has good ductile performance to satisfy the seismic design requirements in high-intensity earthquake regions.

Study on seismic performance of steel frame with archaized-style under pseudo-dynamic loading

  • Liu, Zuqiang;Zhou, Chaofeng;Xue, Jianyang
    • Earthquakes and Structures
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    • v.17 no.1
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    • pp.39-48
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    • 2019
  • This paper presents an experimental study on a 1/2 scale steel frame with archaized-style under the pseudo-dynamic loading. Four seismic waves, including El Centro wave, Taft wave, Lanzhou wave and Wenchuan wave, were input during the test. The hysteresis characteristic, energy dissipation acceleration response, displacement response, strength, stiffness and strain were analyzed. Based on the experiment, the elastoplastic dynamic time-history analysis was carried out with the software ABAQUS. The stress distribution and failure mode were obtained. The results indicate that the steel frame with archaized-style was in elastic stage when the peak acceleration of input wave was no more than 400 gal. Under Wenchuan wave with peak acceleration of 620 gal, the steel frame enters into the elastoplastic stage, the maximum inter-story drift was 1/203 and the bearing capacity still tended to increase. During the loading process, Dou-Gong yielded first and played the role of the first seismic fortification line, and then beam ends and column bottom ends yielded in turn. The steel frame with archaized-style has good seismic performance and meets the seismic design requirement of Chinese code.

Pseudo Dynamic Test of the Seismically Isolated RC Piers (지진격리설계된 RC교각의 유사동적 실험)

  • Kim Young-Jin;Kwahk Im-Jong;Cho Chang-Beck;Kwark Jong-Won
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.25-28
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    • 2004
  • Many highway bridges in Korea need seismic retrofit because only one decade has passed since the seismic design criteria was introduced. In this experimental study, the effectiveness of base isolation bearings was discussed for the seismic retrofit of the highway bridges. Four real scale RC pier specimens were constructed for the test. These RC piers didn't have seismic details. Except for one RC pier for the pilot test, three types of bearings such as Pot bearing, Rubber bearing (RB), Lead-rubber bearing (LRB) were applied to the other RC piers respectively. The RC pier with Pot bearing means current state of the prototype bridge that is not retrofitted seismically. And two RC piers with RB or LRB mean assumed states of the prototype bridge that are retrofitted seismically. To simulate dynamic behavior of these RC piers under earthquake loads, Pseudo-dynamic test method was used.

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Pseudo Dynamic Test Research on the Seismic Performance of RC Bridge Piers Retrofitted with Fiber Sheet (섬유보강 RC교각의 내진성능에 관한 유사동적실험 연구)

  • 박종협;박희상;정영수
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.559-564
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    • 2001
  • The objective of this experimental research is to assess the seismic performance of circular RC bridge pier specimens retrofitted with fibers which were designed as a prototype of Hagal bridge in the city of Suwon, Korea. Pseudo-dynamic test has been done for two nonseismic test specimens which were nonseismic designed by the related provisions of the Highway Design Specification, and four nonseismic test specimens retrofitted with fibers in the plastic hinge region. Important test parameters were load patterns, and retrofit. The seismic behavior has been analyzed through the displacement ductility, energy analysis, and capacity spectrum. Approximate 7.0 displacement ductility was observed for nonseismic test specimens retrofitted with fibers. It is concluded that these retrofitting test specimens could have sufficient seismic capacity in the region of moderate seismic zone.

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Dynamic Stress Analysis of joint by Practical Dynamic Load History (실하중 이력에 의한 조인트의 동적강도해석)

  • ;;;Akira Simamoto
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.10 no.5
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    • pp.118-123
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    • 2001
  • Most structures of automobile are composed of many substructures connected to one another by various types of mechanical joints. In automotive engineering, it is important to study these connected structures under various dynamic farces for the evaluations of fatigue life and stress concentration exactly. It is rarely obtained the accurate load history of specified positions because of the errors such as modeling, measurement, and etc. In the beginning of design, exact load data are actually necessary for the fatigue strength and life analysis to minimize the cost and time of designing. In this paper, the procedure of practical dynamic load determination is developed by the combination of the principal stresses of F.E. analysis and experiment. Inverse problem and least square pseudo inverse matrix are adopted to obtain an inverse matrix of analyzed stresses matrix. Pseudo-Practical dynamic load was calculated for Lab. Test of sub-structure. GUI program(PLODAS) was developed for whole of above procedure. This proposed method could be extended to any geometric shape of structure.

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Remote Parallel Pseudo-dynamic Testings Using Internet on Base-Isolated Bridge (인터넷을 이용한 면진 교량의 원격 병렬 유사동적실험)

  • Chung-Bang. Yun;Park, Dong-Uk.;Eiichi Watanabe;Kazutoshi Nagata
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.521-528
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    • 2003
  • This paper presents the results of a cooperative research on remote parallel pseudo-dynamic testing on a base-isolated bridge with multiple piers using Internet between KAIST, Korea and Kyoto Univ., Japan. Experimental facilities located at two institutions were parallelly used to test the nonlinear behavior of the base-isolators. Two data communication schemes for parallel tests were developed and the performance is compared. The results indicate that the elapsed time may vary widely depending on the data communication and testing schemes : i.e. 1-25sec for each time step. But it is fairly comparable with the time required for pseudo-dynamic testing. The testing method can become more powerful, as the data communication and monitoring techniques through Internet improve further.

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