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 paper, the authors proposed performance-based design procedures accompanied by graphical approaches that incorporate all of those constraints affecting seismic response of deck-truss bridges retrofitted using eccentrically braced frames, vertical shear links, or triangular-plate added damping and stiffness device ductile systems.
Abstract: A companion paper has demonstrated how deck-truss bridges can be retrofitted by converting the end cross-frames and lower end panels adjacent to the truss supports into special ductile panels. However, the design of such retrofitted systems must respect constraints on flexibilities to limit global drifts and ductility demands, as well as other constraints germane to the type of ductile device introduced. This paper proposes performance based design procedures accompanied by graphical approaches that incorporate all of those constraints affecting seismic response of deck-truss bridges retrofitted using eccentrically braced frames, vertical shear links, or triangular-plate added damping and stiffness device ductile systems. Using the proposed method, ductile panels for an 80-m-span deck-truss example bridge using eccentrically braced frames, vertical shear links, and triangular-plate added damping and stiffness device ductile systems were designed, detailed, and modeled by computer. From the results of nonlinear inelastic time history analyses of the retrofitted bridge, it is concluded that all three systems designed according to the proposed procedure performed satisfactorily and enhanced seismic performance of the deck-truss bridges.
33 citations
TL;DR: In this paper, a central prestressing tendon at mid-depth in the beam passing through the joint was shown to be effective in contributing to joint core shear strength and several design recommendations were proposed.
Abstract: Tests were conducted on ten concrete beam-interior column frame assemblies subjected to static cyclic loading simulating the effect of severe earthquake loading. The frame members were near full-scale and contained a range of proportions of prestressing steel and nonprestressed steel. Information applicable to seismic design concerning inelastic flexural deformation capacity and degree of damage was obtained. A central prestressing tendon at mid-depth in the beam passing through the joint was shown to be effective in contributing to joint core shear strength. Several design recommendations are proposed.
33 citations
TL;DR: In this paper, the authors proposed an innovative BRB as a new energy dissipation device for earthquake resistant buildings, which enables the yielding force and plastic deformation to be adjusted according to building requirements.
33 citations
TL;DR: In this article, a seismic isolation system for bridges has been tested on a shake table and the system consisted of Teflon disc bridge bearings and displacement control devices, which provided restoring force for recentering the bridge during earthquake excitation, additional energy dissipation capacity and rigidity for service loading.
Abstract: A seismic isolation system for bridges has been tested on a shake table. The system consisted of Teflon disc bridge bearings and displacement control devices. These devices provided restoring force for re‐centering the bridge during earthquake excitation, additional energy dissipation capacity and rigidity for service loading. The tests were carried out with a 51‐kip model which was subjected to strong recorded earthquake motions with a wide range of frequency content and to simulated motions compatible with CalTrans 0.6g design spectra. In all tests the isolated deck responded with peak acceleration less than the peak table acceleration and peak bearing displacement less than the peak table displacement. Results from an analytical model show very good agreement with experimental results.
33 citations
TL;DR: In this article, the authors present the results of a study on the development of a damage-based seismic reliability model for light-frame wood structures subject to earthquake load, which is presented in conceptual form with a simple example for a symmetric one-story woodframe building.
Abstract: In the United States the majority of modern residential and a portion of commercial structures are woodframe construction which typically consists of dimension lumber sheathed with 1.22×2.44 m ( 4×8 ft ) OSB or plywood panels. This paper presents the results of a study on the development of a damage-based seismic reliability model for light-frame wood structures subject to earthquake load. It is presented in conceptual form with a simple example for a symmetric one-story woodframe building. The concept presented here provides the basic methodology to calibrate a seismic damage model and compute the structural reliability using a damage-based limit state function. The illustrative example necessitated a small experimental program and the use of existing software. The mechanistic damage model chosen for the example expresses damage as a linear combination of the maximum displacement during an earthquake simulation and the hysteretic energy dissipated by each shearwall within a structure. In order to make th...
33 citations