Topic
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.
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TL;DR: In this article, an empirical criterion was proposed to predict the fracture of rectangular tubular bracing members in concentrically braced structures during a severe earthquake by normalizing axial deformation cycles into standard cycles.
Abstract: Bracing members in concentrically braced structures may be subjected to large cyclic deformations in post-buckling range during a severe earthquake causing possible early fractures. This paper investigates the phenomenon and presents an empirical criterion to predict the fracture of rectangular tubular bracing members. The criterion includes two parts: normalizing axial deformation cycles into standard cycles, and predicting the fracture life of the bracing members in terms of the standard cycles. The criterion is incorporated into DRAIN-2DM, a general purpose computer program for dynamic analysis of inelastic structures. The U.S.-Japan Phase I test structure, a six-story, two-bay by two-bay steel structure with concentric bracing, is analyzed using the criterion and analytical results are compared with the test results.
72 citations
TL;DR: In this paper, the authors investigated the behavior of cast-in-place reinforced concrete infill reinforced concrete structures under seismic loads and proposed a simple dynamic evaluation to predict the dynamic behavior of infilled frames under seismic action.
Abstract: Strengthening of framed reinforced concrete structures by cast‐in‐place reinforced concrete infills is commonly used in practice. The objective of this study is to investigate the behavior of such infilled frames under seismic loads. For this purpose, 14 two‐story, one‐bay infilled frames are tested under reversed cyclic loading simulating seismic action. The variables investigated are the effect of type of infill reinforcement, the connection between the frame and the infill, and the flexural capacity of columns. Test results are evaluated to estimate the effects of infill on stiffness, strength, energy dissipation, lateral drift, and ductility. The feasibility of different analytical methods is also investigated. The results obtained using such analytical methods are compared with the experimental observations. Using the test results, a simple dynamic evaluation is made to predict the dynamic behavior of infilled frames under seismic action.
71 citations
TL;DR: In this article, a variable damper is proposed to control bridge response against an earthquake, which changes its damping coefficient depending on the structural response so that it can resist an earthquake.
Abstract: This paper discusses a variable damper proposed to control bridge response against an earthquake. The variable damper changes its damping coefficient depending on the structural response so that it...
71 citations
TL;DR: In this paper, a parametric study of the response of bridge superstructures supported on lead-rubber bearings when subjected to the 1940 El Centro earthquake (N•S component) and the 1966 Parkfield earthquake was performed.
Abstract: This paper reports on a parametric study of the response of bridge superstructures supported on lead‐rubber bearings when subjected to the 1940 El Centro earthquake (N‐S component) and the 1966 Parkfield earthquake. The effect of parameters such as lead‐plug size and aspect ratio, bearing thickness and yield strength, pier, abutment, and superstructure stiffnesses, and different earthquake records were investigated. The results of the time‐history analyses by Turkington (1987) produced clear trends that are used in the design procedure proposed by Turkington et al. (1987, 1989). The trends showed that the presence of lead shifts the natural period of the structure and increases the amount of damping. The magnitude of the period change and damping decreases as the natural period of the structure increases or as the pier height increases. Lead‐rubber bearings are most effective when used in conjunction with stiff substructures and can be used to redistribute seismic forces between piers and abutments.
70 citations