Earthquake resistant structures

About: Earthquake resistant structures is a research topic. Over the lifetime, 1126 publications have been published within this topic receiving 27467 citations.

Shear behavior of urm retrofitted with frp overlays

Abstract: A large inventory of older masonry buildings exists in earthquake-prone regions. In most cases these buildings contain shear walls constructed of unreinforced masonry. The majority of these buildings were built before any provisions for earthquake loadings were established. The failures and damages reported in recent earthquakes attest to the need for efficient strengthening procedures. The effectiveness of increasing the shear strength of brick masonry by epoxy-bonding fiber-reinforced polymer (FRP) overlays to the exterior surfaces was evaluated. The variables in the test included the strength of the composite fabric, fiber orientation, and anchorage length. The specimens were tested under static loading. The results showed that both the strength and ductility of tested specimens were significantly enhanced with this technique. The orientation of the angle of fibers with respect to the plane of loading had a major effect on the stiffness of the retrofitted system but did not affect the ultimate strength significantly.

Applications of Viscoelastic Dampers to High‐Rise Buildings

Abstract: In this paper, the features of energy‐absorbing capacities of the viscoelastic damper and its effect on the structure during earthquakes are investigated. To clarify the behavior of the structure with added viscoelastic dampers, a new analytical model for the viscoelastic damper taking into consideration the earthquakelike loading and the temperature effect, in good agreement with experimental results, and an advanced finite element formulation for the viscoelastic damper are developed. The proposed method could be implemented easily in the finite element program. In this study the behavior of a 10‐story building equipped with viscoelastic dampers is examined while it is subjected to earthquake ground motions. Both analytical and experimental results show that the energy‐absorbing capacity of the viscoelastic damper decreases with increasing the ambient temperature. Numerical examples show that the responses, including displacements and stresses, of the high‐rise building to earthquake loadings are signif...

Base-Isolated FCC Building: Impact Response in Northridge Earthquake

Abstract: The base-isolated Fire Command and Control (FCC) building in Los Angeles experienced strong motion during the 1994 Northridge earthquake. The California Strong Motion Instrumentation Program has instrumented the building and recorded the data during the Northridge earthquake; these data are available for performance evaluation. Impact was observed in the base-isolated FCC building during the Northridge earthquake. The objective of this study is to evaluate the seismic performance of the base-isolated FCC building during the 1994 Northridge earthquake and the effect of impact. New analytical modeling techniques are developed to analyze the base-isolated FCC building with impact and are verified using system identification. The response computed, using the developed analytical modeling techniques, is verified using recorded data. The response with and without impact is presented. The effects of impact on the structural response are evaluated. The seismic performance evaluations, comparing the response of th...

Earthquake Load for Structural Reliability

Abstract: An ultimate limit state criterion is developed for the seismic reliability assessment of single-story structures. This criterion is: when the structural precollapse energy absorption capacity is greater than the earthquake energy input, the structure can survive. Thus, the load effect is the maximum earthquake energy input which the building is expected to encounter during its lifetime. For the determination of this load effect, the seismic hazard potential as well as the dynamic characteristics of the structure and the ground motion are considered in this study. The seismic hazard term is determined from seismic source and attenuation models, and the dynamic characteristic term is determined from the energy input spectrum of inelastic single-degree-of-freedom (SDOF) systems. The uncertainty involved in these terms is also investigated in order to calculate the failure probability.