Papers by Keyword: Earthquake

Abstract: Keywords: Earthquake, Internal Forces, Displacement, Response Spectrum Analysis, Time History Analysis, PoundingAbstract. Teaching Hospital is an educational facilitiy for students in the Faculty of Medicine and also as a health services for the general public. The hospital building must be built in accordance with earthquake-safe building standards, so that buildings are not damaged in an earthquake. Andalas University Hospital was built at Padang in 2014 which was designed using Indonesian Seismic Code SNI 03-1726-2002 with quakes zone 6. Since 2012, a new Seismic Code, SNI 1726-2012, was issued and all the buildings should be designed by using the new code. Therefore, the authors are interested in analyzing the structural response of the hospital building by using new seismic code SNI 1726-2012. The results, then, were compared with the responses of the structure which calculated by using SNI 03-1726-2002.The results of analysis show that the structural responses in the internal forces and displacement by using SNI 1726-2012 was higher than those using SNI 03-1726-2002. In this study, an analysis of potential Pounding was also conducted by using dynamic analysis Time History method. The analytical result shows that there is no pounding between adjacent buildings at Andalas University Hospital Buildings.

Abstract: This paper deals with a problem of earthquake of the cylindrical tank. During the seismic event, the load acts in one direction only, i.e. in the direction of earthquake. This load imposes a non-symmetrical loading of a structure. At seismic load of structure of cylindrical tank was used accelerogram. In final part of the paper some crucial results are presented both in a graphical and numerical way.

Abstract: Having a realistic estimate of structural parameters, such as natural frequency and damping is important for design purposes. In this study, available wind and earthquake induced acceleration data from four multi-story reinforced concrete buildings are utilized to examine structural behaviour and system parameters. The buildings measurement systems are described and the recorded structural response data presented. The data stems from two different sources of excitation, i.e. wind and earthquake, and are recorded for various excitation levels and environmental conditions. System identification analyses of the buildings are carried out applying previously verified parametric methods to the recorded data. The natural frequencies and critical damping ratios established from the recordings are compared to values estimated using design guidelines and international data compilations for reinforced concrete structures of similar type. Considerable variability is discovered between the different estimation formulas and the observed natural frequencies of the buildings are found to lie at the upper limit of the prediction formula.

Abstract: Capacitor banks are used widely in many different regions. Since seismic requirements are different from place to place, custom design is needed. Finite element simulation is used to help designers in this paper. All mechanical response of capacitor bank in different load cases are calculated. With these simulation support, custom design of capacitor banks is done for different regions safely and effectively.

Abstract: This study aims at presenting a methodology for the taking decision about the retrofit or the destruction of the damaged buildings by an earthquake. The proposition is founded on the damages caused by the seism of Boumerdes in Algeria, on 23 May 2003. This work can to help the authorities and owners to make a choice concerning the retrofit or the destruction of buildings and reconstruction.The analysis begins by the identification of the structural damages in the structures, then by the evaluation of costs of the reparations and the retrofit of all functions of the building. If the owner has contracted insurance, the amount of insurance is deducted. After this step, this cost is compared to the cost of the destroying of the old building and the rebuilding cost of a new similar building. The life duration of structure is integrated respectively for the retrofitted building and the build of a new equivalent building. The depreciation of capital according to the time of exploitation is calculated on the reference: fifty years for the new investments, and twenty-five years for the retrofitted buildings.The resolution of the problem uses the comparison between the cost of retrofit divided by twenty-five to which added the amount of insurance, and the cost of new equivalent construction divided by fifty to which added the amount of destruction. This approach gives a result according to retrofit, insurance, the equivalent new building and the depreciation of capital. The compilation of the actualized costs according to each zone permits to have a quick vision about the economical decision. The cost of the urban land component is not taken in account and the network is considered in good state.

Abstract: This paper presents a computational study for comparison of the behavior of a ten stories building equipped with two type of damping system: Buckling Restrained Braces (BRB dampers) and SERB new romanian dampers, during romanian earthquakes, according to romanian codes for seismic analysis. This study was computationally finalized using a software program made by the authors which permits time-history dynamic analysis of buildings equipped with different damping devices with different hysteresis such as: Maxwell, Kelvin-Voigt, Zener, Bouc-Wen, Taylor. The study will compare the drifts and the forces applied to the structure by the dampers. The SERB C-194 dampers are a cheaper way to protect the building during earthquake and restrict the drifts similarly with BRB dampers.

Abstract: This paper presents analytical, numerical and experimental studies of SERB TEL-150 new Romanian devices for dissipation of seismic energy for buildings affected by Romanian Vrancea earthquakes. These devices were invented to be positioned at the foundation of buildings and were tested in static cases. The purpose of these studies is to determine the analytical model of the special shape hysteresis of these new devices which is necessary to obtain the mathematical equation for these hysteresis curves. The experimental and the numerical analysis of SERB TEL-150 were performed in order to determine the experimental and the numerical hysteresis curves which are to be modeled with a modified Bouc-Wen model. These devices were invented by PhD.eng. Viorel Serban (CITON – Center for Technology and Engineering for Nuclear Projects) and they were used for equipping NAVROM building in Galati, Romania.

Abstract: Ground-supported tanks are used to store a variety of fluids. The liquid develops a hydrodynamic effect on walls and bottom of the tank during earthquake. This paper presents influence of mesh parameter “PATTERN” for numerical model fluid region of liquid seismic response in rectangular tank – endlessly long shipping channel. Finite Element Method (FEM) was used in software Adina.

Abstract: This paper presents the probabilistic safety assessment of nuclear power plant (NPP) in Slovakia due to earthquake event. The experiences from the deterministic and probabilistic seismic analyses of the structure resistance are mentioned. On the base of the geophysical and seismological monitoring of locality the peak ground acceleration was defined for the return period 10⁴ years using the Monte Carlo simulations. The synthetic spectrum compatible accelerograms generated in program COMPACEL are presented in comparison with requirements of ASCE4/98 standard.

Abstract: Redundancy is an important component of structural robustness. A method is proposed based on the response sensitivity for assessment of the redundancy of structure under earthquake. Redundancy analysis is carried out for a single-layer reticulated dome subjected to earthquake condition. The result shows that the redundancy values are able to reveal the weak links in the structure. Members with a small redundancy are identified as structural weaknesses that are easily damaged under loads, and their failure may cause catastrophic consequences to the structure. Therefore, the members with small redundancies must be treated as key components of the structures.