• Title/Summary/Keyword: seismic performance

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Study of seismic performance of cable-stayed-suspension hybrid bridges

  • Zhang, Xin-Jun;Yu, Zhou-Jun
    • Structural Engineering and Mechanics
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    • v.55 no.6
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    • pp.1203-1221
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    • 2015
  • By taking a cable-stayed-suspension hybrid bridge with main span of 1400 m as example, seismic response of the bridge under the horizontal and vertical seismic excitations is investigated numerically by response spectrum analysis and time history analysis, its seismic performance is discussed and compared to the cable-stayed bridge and suspension bridge with the same main span, and considering the aspect of seismic performance, the feasibility of using cable-stayed-suspension hybrid bridge in super long-span bridges is discussed. Under the horizontal seismic action, the effects of structural design parameters including the cable sag to span ratio, the suspension to span ratio, the side span length, the subsidiary piers in side spans, the girder supporting system and the deck form etc on the seismic performance of the bridge are investigated by response spectrum analysis, and the favorable values of these design parameters are proposed.

A study on the Capacity Spectrum for Seismic Performance Evaluation of Bridge (교량의 내진성능 평가를 위한 역량스펙트럼 적용 연구)

  • Park, Yeon-Soo;Lee, Byung-Geun;Kim, Eung-Rok;Suh, Byung-Chul;Park, Sun-Joon;Choi, Sun-Min
    • Proceedings of the KSR Conference
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    • 2008.11b
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    • pp.1012-1017
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    • 2008
  • In this study, We examine closely the capacity spectrum method which a kind of displacement-based method evaluated by displacement of structure as an alternative to the load-based analysis method. The displacement-based method can easily review the strength of structure, seismic performance, ductility. Seismic performance by using capacity spectrum method is divided into design response spectrum and capacity spectrum. We can diagram design response spectrum by deciding the design seismic factor depending on performance target, site classification, seismic level, return period as UBC-97. Capacity spectrum is a load-displacement curve obtained by Push-over analysis considering the geometric parameter and the material parameter. We execute the seismic performance evaluation by using the capacity spectrum method to reinforced concrete pier which has been seismic design. As a result, We confirmed that there is a yield point and a ultimate point close by design response spectrum of UBC-97.

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Effect of masonry infilled panels on the seismic performance of a R/C frames

  • Aknouche, Hassan;Airouche, Abdelhalim;Bechtoula, Hakim
    • Earthquakes and Structures
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    • v.16 no.3
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    • pp.329-348
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    • 2019
  • The main objective of this experimental research was to investigate the Seismic performance of reinforced concrete frames infilled with perforated clay brick masonry wall of a type commonly used in Algeria. Four one story-one bay reinforced concrete infilled frames of half scale of an existing building were tested at the National Earthquake Engineering Research Center Laboratory, CGS, Algeria. The experiments were carried out under a combined constant vertical and reversed cyclic lateral loading simulating seismic action. This experimental program was performed in order to evaluate the effect and the contribution of the infill masonry wall on the lateral stiffness, strength, ductility and failure mode of the reinforced concrete frames. Numerical models were developed and calibrated using the experimental results to match the load-drift envelope curve of the considered specimens. These models were used as a bench mark to assess the effect of normalized axial load on the seismic performance of the RC frames with and without masonry panels. The main experimental and analytical results are presented in this paper.

Feasibility Study for Seismic Performance Enhancement of NPP Based on Equipment Base Isolation (기기면진 기반 원전 내진성능 상향 타당성 검토)

  • Lee, Jin Hyeong;Shin, Tae Myung;Koo, Gyeong Hoi
    • Transactions of the Korean Society of Pressure Vessels and Piping
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    • v.14 no.2
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    • pp.88-95
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    • 2018
  • In this study, to enhance the seismic performance of nuclear power plants (NPP), a small laminated rubber bearing (LRB) is chosen as a seismic design option of the vulnerable equipment. Prior to the application of equipment base isolation, it is necessary to review the feasibility that the technique contributes enough to the seismic performance of NPP by analysis. At first, some preliminary design of small LRBs for equipment is carried out. Design parameters such as horizontal and vertical stiffnesses, design natural frequencies are checked by calculation and analysis for the four design options considering various upper weights. Performance test of small LRB is to be carried out to verify static performance using the results.

A Study on the Seismic Performance Design of Waterproofing Materials Applied to Single-side Walls of Underground Structures (지하 구조물 합벽구간에 적용되는 방수재료의 내진성능설계를 위한 기초 자료조사 연구)

  • Kim, Soo Yeon;Na, Mi Ok;Lee, Sung Jin;Kim, Meong Ji;Oh, Sang Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.11a
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    • pp.220-221
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    • 2019
  • At a time when the recent earthquake in Pohang, Korea requires the need for seismic performance design not only for concrete structures but also for construction materials used in construction structures, the possibility of applying the seismic performance design of waterproof materials constructed in the form of direct or partial adhesion to concrete structures in the underground Single-side walls section was confirmed.

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Evaluation on the Seismic Performance of Port Structures using GIS (GIS를 이용한 항만구조물의 내진성능 평가기법)

  • Kim, Na Young;Kang, In Joon;Choi, Hyun;Kim, Tae Hyo
    • Journal of Korean Society for Geospatial Information Science
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    • v.22 no.4
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    • pp.31-38
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    • 2014
  • Seismic of the Korean Peninsula is terrible about 1,900 times. Lately, because of a world-occurring seismic, investment of seismic design about ground & structures come to the force as means to protect national life and property. This study evaluated having seismic performance above design criteria among the existing port structures not applied seismic design. Based on the results, classified apprehensive area of liquefaction from seismic performance evaluation and made hazards according to liquefaction risk & structural performance using the analysis of seismic performance and GIS method. After Establishing quantitative & detailed input database through liquefaction evaluation and seismic performance, analysed all seismic data are used directly valuation data on repair reinforcement for apprehensive area of earthquakes.

Seismic Performance Evaluation of Piping System Crossing the Isolation Interface in Seismically Isolated NPP (면진 원전 면진-비면진구간 연결 배관의 내진성능 평가)

  • Hahm, Daegi;Park, Junhee;Choi, In-Kil
    • Journal of the Earthquake Engineering Society of Korea
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    • v.18 no.3
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    • pp.141-150
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    • 2014
  • A methodology to evaluate the seismic performance of interface piping systems that cross the isolation interface in the seismically isolated nuclear power plant (NPP) was developed. The developed methodology was applied to the safety-related interface piping system to demonstrate the seismic performance of the target piping system. Not only the seismic performance for the design level earthquakes but also the performance for the beyond design level earthquakes were evaluated. Two artificial seismic ground input motions which were matched to the design response spectra and two historical earthquake ground motions were used for the seismic analysis of piping system. The preliminary performance evaluation results show that the excessive relative displacements can occur in the seismically isolated piping system. If the input ground motion contained relatively high energy in the low frequency region, we could find that the stress response of the piping system exceed the allowable stress level even though the intensity of the input ground motion is equal to the design level earthquake. The structural responses and seismic performances of piping system were varied sensitively with respect to the intensities and frequency contents of input ground motions. Therefore, for the application of isolation system to NPPs and the verification of the safety of piping system, the seismic performance of the piping system subjected to the earthquake at the target NPP site should be evaluated firstly.

Seismic damage assessment of steel reinforced recycled concrete column-steel beam composite frame joints

  • Dong, Jing;Ma, Hui;Zhang, Nina;Liu, Yunhe;Mao, Zhaowei
    • Earthquakes and Structures
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    • v.14 no.1
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    • pp.73-84
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    • 2018
  • Low cyclic loading tests are conducted on the steel reinforced recycled concrete (SRRC) column-steel (S) beam composite frame joints. This research aims to evaluate the earthquake damage performance of composite frame joints by performing cyclic loading tests on eight specimens. The experimental failure process and failure modes, load-displacement hysteresis curves, characteristic loads and displacements, and ductility of the composite frame joints are presented and analyzed, which shows that the composite frame joints demonstrate good seismic performance. On the basis of this finding, seismic damage performance is examined by using the maximum displacement, energy absorbed in the hysteresis loops and Park-Ang model. However, the result of this analysis is inconsistent with the test failure process. Therefore, this paper proposes a modified Park-Ang seismic damage model that is based on maximum deformation and cumulative energy dissipation, and corrected by combination coefficient ${\alpha}$. Meanwhile, the effects of recycled coarse aggregate (RCA) replacement percentage and axial compression ratio on the seismic damage performance are analyzed comprehensively. Moreover, lateral displacement angle is used as the quantification index of the seismic performance level of joints. Considering the experimental study, the seismic performance level of composite frame joints is divided into five classes of normal use, temporary use, repair after use, life safety and collapse prevention. On this basis, the corresponding relationships among seismic damage degrees, seismic performance level and quantitative index are also established in this paper. The conclusions can provide a reference for the seismic performance design of composite frame joints.

Evaluation of Seismic Performance for Various Types of Pile Head of Landing Pier (잔교식 안벽에서 말뚝 두부형식에 따른 내진성능 평가)

  • Jang In-Sung;Kwon O-Soon;Park Woo-Sun;Jeong Weon-Mu
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.17 no.2
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    • pp.70-79
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    • 2005
  • Most of landing piers in Korea employ the combination of vertical piles and batter piles, which shows good efficiency in static lateral resistance but poor seismic performance. Many attempts have continuously been made to increase the seismic performance of batter piles with various aseismatic systems. In this study, new types of aseismatic system were developed by use of rubber and ball bearing, and shaking table tests and 3 dim. numerical analyses were performed in order to compare the seismic performance for various types of pile head. The test and numerical analysis results show the high seismic performance of newly proposed systems and the applicability off dim. numerical analysis considering the non-linear behaviour of rubber and ball bearing systems.

Strengthening of an Existing Bridge for Achievement of Seismic Performance (내진성능 확보를 위한 기존교량의 보강)

  • Kook, Seung-Kyu
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.22 no.2
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    • pp.181-187
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    • 2009
  • After introduction of the earthquake resistant design code, it is required to achieve seismic performance of existing bridges as well as earthquake resistant design of new bridges. The achievement of seismic performance for existing bridges should satisfy the no collapse requirement based on the basic concept of earthquake resistant design, therefore, various methods with different strengthening scale should be suggested according to bridge types and importance categories. At present for typical bridges, most studied and applied strengthening methods are bearing change, pier strengthening and shear key installation for improvement of seismic performance. In this study a typical existing bridge, for which earthquake resistant design is not considered, is selected as an analysis bridge. Design changes are carried out to satisfy the no collapse requirement by way of the ductile failure mechanism and seismic performances are checked. It is shown that the seismic performance of existing bridges can be achieved by way of redesign of bridge system, e.g. determination of pier design section for substructure and change of bearing function for connections between super/sub-structure.