• Title/Summary/Keyword: dynamic time-history analysis

Search Result 513, Processing Time 0.034 seconds

Nonlinear Dynamic Response of Well-Slab Apartment Building Considering The Behavior of Coupling Elements (벽식 아파트 구조에서 연결부재의 거동특성을 고려한 비선형 동적 응답)

  • 김기현;장극관;서대원;천영수
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2002.05a
    • /
    • pp.437-442
    • /
    • 2002
  • The purpose of this study is to investigate nonlinear behavior and estimate ultimate resistance of the wall structure against seismic loading. Experimental data for RC coupling elements are used for specifying the strength deterioration and stiffness degradation factor of hysteretic model. Modified coupling element models are used in the push over analysis and time history analysis. In the time history analysis, three earthquake waves are used in the analysis and their peak ground accelerations are changed to be 0.2g. The conclusions of this study are as follows : (1) In the push over analysis, yielding of coupling elements occurred at lower story with small story drift ratio as 0.3%. (2) In the time history analysis, the story drift ratio is sufficient for the requirement of Korean Code, But coupling elements at most stories of the buildings occurred yielding. i. e. the earthquake resistant capacity of shear wall structures is not sufficient at 0.2g.

  • PDF

Generation of Design Spectrum Compatible Ground Motion in Time Domain (시간영역에서 생성되는 설계응답스펙트럼 맞춤형 지진파 생성)

  • Jeong, Chang-Gyun;Park, Du-Hee
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • 2009.09a
    • /
    • pp.1250-1257
    • /
    • 2009
  • Due to the improvement of the seismic hazard analysis method and the design code, dynamic analysis method is widely used. To conduct dynamic analysis, various coefficients should be designated. The time history acceleration is one of the most essential factor. However, strong earthquake motion data from the outside of the country have been used to conduct dynamic analysis without considering of the ground motion parameters. In this study, the methodology to choose appropriate input motion is developed by using time domain design spectrum matching procedure. Two examples are applied to verify the methodology. The Result shows that the methodology satisfies seismic circumstances and the design code.

  • PDF

A Study on Dynamic Analysis and Fatigue Life of the Belt in the OHT Vehicle (OHT 차량 벨트 동특성 및 피로 수명에 관한 연구)

  • Jung Il-Ho;Kim Chang-Su;Cho Dong-Hyeob;Park Joong-Kyung;Park Tae-Won
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.29 no.8 s.239
    • /
    • pp.1085-1092
    • /
    • 2005
  • The OHT(Over Head Transportation) Vehicle transports heavy products quickly and repeatedly at the industrial workplace. The belt in the OHT vehicle is used to support the weight of the OHT Cage. The fatigue of the belt is caused by the dynamic load during the operation time. Since the fatigue fracture of the belt affects the safety at the workplace, the correct prediction of the dynamic load is necessary to calculate the fatigue life of the belt on the design step. In this paper a computer aided analysis method is proposed for the belt in the early design stage using dynamic analysis, stress analysis, belt tensile test, belt fatigue test and fatigue lift prediction method. From the dynamic load time histories and the stress of the belt FE model, a dynamic stress time history is produced. Using linear damage law and cycle counting method, fatigue life cycle is calculated. The method developed in this paper is used to reduce the time and cost for designing the OHT belt in different environment and condition.

Seismic performance evaluation and retrofitting with viscous fluid dampers of an existing bridge in Istanbul

  • Bayramoglu, Guliz;Ozgen, Alpay;Altinok, Enver
    • Structural Engineering and Mechanics
    • /
    • v.49 no.4
    • /
    • pp.463-477
    • /
    • 2014
  • In this paper, seismic performance of Kozyatagi Bridge is evaluated by employing nonlinear elasto-plastic dynamic analysis and the deformation-based performance. The time-history records of the 1999 Izmit, 1971 San Fernando and 1989 Loma Prieta earthquakes are modified by adopting a probability of exceedance of 2% in 50 years corresponding to the return period of 2475 years. The analysis is carried out for three different bearing cases which are movable bearings, restrained bearings, and movable bearings with viscous fluid dampers in the radial direction. The analysis results show that the bridge can be retrofitted with viscous fluid dampers. In this case the reinforced concrete piers need not be strengthened by any jacketing techniques in order to preserve the original architectural appearance of the bridge. The retrofitting design of the bridge with viscous fluid dampers is also presented in detail.

Seismic performance of skewed highway bridges using analytical fragility function methodology

  • Bayat, M.;Daneshjoo, F.
    • Computers and Concrete
    • /
    • v.16 no.5
    • /
    • pp.723-740
    • /
    • 2015
  • In this study, the seismic performance of skewed highway bridges has been assessed by using fragility function methodology. Incremental Dynamic Analysis (IDA) has been used to prepare complete information about the different damage states of a 30 degree skewed highway bridge. A three dimensional model of a skewed highway bridge is presented and incremental dynamic analysis has been applied. The details of the full nonlinear procedures have also been presented. Different spectral intensity measures are studied and the effects of the period on the fragility curves are shown in different figures. The efficiency, practicality and proficiency of these different spectral intensity measures are compared. A suite of 20 earthquake ground motions are considered for nonlinear time history analysis. It has been shown that, considering different intensity measures (IM) leads us to overestimate or low estimate the damage probability which has been discussed completely.

Full-Scale Shaking Table Test and Analysis of Seismic Ceiling Systems (내진 천장시스템의 실규모 진동대 실험 및 해석)

  • Kim, Hoyeon;Choi, Yong-Soo;Sim, Jaeil;Cho, Chang-Geun
    • Journal of Korean Association for Spatial Structures
    • /
    • v.18 no.1
    • /
    • pp.135-143
    • /
    • 2018
  • In the current research, a seismic ceiling system as one of non-structural elements in buildings has been developed by applying newly designed vertical hanger clips combined with M-bar channel clips. In order to evaluate the seismic performance of the developed system, full-scale shaking table tests of one story frame structure with the conventional ceiling system or the developed seismic ceiling system were performed with time-history responses under earthquake loads. The developed system was also evaluated by the time-history dynamic analysis. From seismic test and analysis, it was shown that the developed seismic ceiling system could give improved seismic performances to minimize displacements and damages of ceiling systems as well as enhance seismic safety of the ceiling system.

Direct Evaluation of the Maximum and Limit States of Inelastic Structures Under Step Loads

  • Lee, Sang-Ho-
    • Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
    • /
    • 1992.08a
    • /
    • pp.146-149
    • /
    • 1992
  • The dynamic inelastic analysis is now often performed for the safe structural design against the seismic events or explosions. Several powerful methods of dynamic inelastic analysis such as direct intergration methods and modal superposition methods were developed with the development of computers during the last three decades. This type of analysis generally adopts the step-by-step time-integration procedure and gives a complete time history of the evolution of the structure.(omitted)

  • PDF

Seismic performance evaluation for steel MRF: non linear dynamic and static analyses

  • Calderoni, B.;Rinaldi, Z.
    • Steel and Composite Structures
    • /
    • v.2 no.2
    • /
    • pp.113-128
    • /
    • 2002
  • The performance of steel MRF with rigid connections, proportioned by adopting different capacity design criteria, is evaluated in order to highlight the effectiveness of static non-linear procedure in predicting the structural seismic behavior. In the framework of the performance-based design, some considerations are made on the basis of the results obtained by both dynamic time histories and push-over analyses, particularly with reference to the damage level and the structure ability to withstand a strong earthquake.

Analysis on the Dynamic Respone of the Hull Structure due to Slamming Impact - By Finite Element Method - (슬래밍 충격을 받는 선체의 동적 응답해석 -유한요소법으로-)

  • Hong, Bong-Ki;Moon, Duk-Hong;Bae, Dong-Myung
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.19 no.2
    • /
    • pp.117-124
    • /
    • 1983
  • In rough seas, actual behaviours of a ship may not be estimated by the linear strip theory, because of Nonlinearities due to the hull shape, bottom slamming and bottom and/or bow-flare slamming. In case of slamming, impulsive hydrodynamic pressure occurs on the fore body surface of the ship, resulting hull vibration called whipping, by which the ship may suffer from serious structural damages and the impact pressure, depends critically on the relative velocity at re-entry. In this paper, the Time history of impact froce at each station, the longitudinal distribution of impact force at critical time, the Time history of acceleration at F.P. and the Time history of Bending moment at midship are illustrated. That is, authors analyzed Dynamic response of container ship to be subjected slamming impact force.

  • PDF

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
    • /
    • v.10 no.5
    • /
    • pp.118-123
    • /
    • 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.

  • PDF