Higa J.T.,Japan Peru Center for Earthquake Engineering Research and Disaster Mitigation |
Sugano S.,Japan Building Research Institute |
Saito T.,Japan Building Research Institute
Bulletin of the International Institute of Seismology and Earthquake Engineering | Year: 2010
A new structural system consisting of reinforced concrete wall with electro-welded mesh is being used for the buildings construction in Peru. These walls have small thickness. The Peruvian standards for this wall-system were published in 2004 in order to restrict the use of the electro-welded mesh as main reinforcement. However many buildings have been built before that and electro-welded mesh was used as reinforcement for whole building. In order to evaluate the behavior of this system, the test results of 7 isolated walls and 1-story wall-system house were used. This test results have been compared with analytical results in order to find out an adequate way for the analysis of this wall-system. In the isolated walls analysis, the cracking strength and ultimate strength were calculated to apply a tri-linear model to be used in the degrading tri-linear hysteresis model to compare it with the hysteretic curve of the isolated walls. The isolated wall analysis was applied in the analysis of 1-story wall-system house to evaluate its behavior and compare it with test results. In order to apply the proposed evaluation methods, a 2-story house wall system was analyzed to evaluate the seismic response by the displacement method using the degrading tri-linear hysteresis model. It is expected to use this analysis to evaluate the behavior of existing and new buildings using the reinforced concrete wall-system with electro-welded-mesh.
Lavado L.,Japan Peru Center for Earthquake Engineering Research and Disaster Mitigation |
Taira J.,Japan Peru Center for Earthquake Engineering Research and Disaster Mitigation |
Gallardo J.,Japan Peru Center for Earthquake Engineering Research and Disaster Mitigation
Journal of Disaster Research | Year: 2014
Masonry is one of the most common structural materials used to build houses in the city of Lima, Peru. The structural features of this material and its components vary widely, however, due to the manufacturing process, which uses bricks and aggregates and different levels of labor. This paper presents experimental results realized using bricks, prism and wallettes to determine the mechanical properties of masonry. © 2014 Fuji Technology Press. All rights reserved.
Sifuentes A.,Japan Peru Center for Earthquake Engineering Research and Disaster Mitigation |
Okawa I.,Japan Building Research Institute
Bulletin of the International Institute of Seismology and Earthquake Engineering | Year: 2014
An empirical method is used to simulate spectrum compatible time histories for a megathrust earthquake scenario in Peru. The Pisco earthquake (Mw 8.0) is the earthquake scenario. An empirical attenuation formula for acceleration response spectra provides the target spectrum. Moreover, empirical formulas to evaluate the mean μtgr and the variance σ2 tgr of group delay time are used. The empirical formulas use site coefficients to represent local characteristics of ground motions due to underlying soil structure. Deep shear-wave velocity profiles in Lima, Peru and soil profile information from the KiK-net seismic network in Japan are used to calculate transfer functions and evaluate the site effect. Although there is good agreement with response spectra in a certain range of periods and peak acceleration values in time domain for observed and simulated ground motions, it is not advisable the direct use of empirical formulas. However, the procedure to construct waveforms, based on the phase content, used has proven to be a good technique to simulate ground motions.
Salazar R.E.R.,Japan Peru Center for Earthquake Engineering Research and Disaster Mitigation |
Saito T.,Japan Building Research Institute
Bulletin of the International Institute of Seismology and Earthquake Engineering | Year: 2013
A numerical simulation to evaluate responses of seismically isolated buildings during the Great East Japan Earthquake in 2011 is carried out in this study. The numerical simulation includes non-linear analyses of the base isolation system based on a Simple Bi-Linear Model and Modified Bi-Linear Model, which take into consideration the degradation of the secondary stiffness. From the result of those analyses, it was proved that the response of seismically isolated buildings is as follow: the base isolation system has non-linear behavior and the upper-structure behaves in the elastic range, because the base isolation decouples the movement from the ground motion, the displacement concentrates at the isolation level and the upper-structure behaves as a rigid body. A proposal for the design procedure for base isolated buildings in Peru is made in this study. This procedure is based on the recommendation of CIB (International Council for Research and Innovation in Building and Construction), using the preliminary design procedure for seismically isolated buildings (CW2012) and taking into consideration the Peruvian seismic code.