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Seismic loading

About: Seismic loading is a research topic. Over the lifetime, 6209 publications have been published within this topic receiving 73238 citations. The topic is also known as: seismic loading.


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Journal ArticleDOI
TL;DR: In this paper, a clipped-optimal control strategy based on acceleration feedback for controlling magnetorheological dampers is proposed to reduce structural responses due to seismic loads, and a numerical example, employing a newly developed model that accurately portrays the salient characteristics of the MR dampers, is presented to illustrate the effectiveness of the approach.
Abstract: Control of civil engineering structures for earthquake hazard mitigation represents a relatively new area of research that is growing rapidly. Control systems for these structures have unique requirements and constraints. For example, during a severe seismic event, the external power to a structure may be severed, rendering control schemes relying on large external power supplies ineffective. Magnetorheological (MR) dampers are a new class of devices that mesh well with the requirements and constraints of seismic applications, including having very low power requirements. This paper proposes a clipped-optimal control strategy based on acceleration feedback for controlling MR dampers to reduce structural responses due to seismic loads. A numerical example, employing a newly developed model that accurately portrays the salient characteristics of the MR dampers, is presented to illustrate the effectiveness of the approach.

1,296 citations

Book
01 Jan 1998
TL;DR: Stability analysis by Finite-element method as discussed by the authors has been used for dynamic stability analysis of columns and columns in a variety of structural and structural components, e.g., columns with Elastic Lateral Restraints.
Abstract: Stability Theory. Centrally Loaded Columns. Plates. Beams. Plate Girders. Box Girders. Beam--Columns. Horizontally Curved Steel I--Girders. Composite Columns and Structural Systems. Stability of Angle Members. Bracing. Thin--Walled Metal Construction. Circular Tubes and Shells. Members with Elastic Lateral Restraints. Frame Stability. Arches. Doubly Curved Shells and Shell--Like Structures. Selected Topics in Dynamic Stability. Stability Under Seismic Loading. Stability Analysis by Finite--Element Method. Appendices. Indexes.

1,011 citations

Journal ArticleDOI
TL;DR: A large-scale five-story precast concrete building constructed to 60 percent scale was tested under simulated seismic loading as the culmination of the 10-year PRESSS (Precast Seismic Structural Systems) research program as discussed by the authors.
Abstract: A large-scale five-story precast concrete building constructed to 60 percent scale was tested under simulated seismic loading as the culmination of the 10-year PRESSS (Precast Seismic Structural Systems) research program. The building comprised four different ductile structural frame systems in one direction of response and a jointed structural wall system in the orthogonal direction. The test structure was subjected to seismic input levels equivalent to at least 50 percent higher than those required for UBC (Uniform Building Code) Seismic Zone 4. The behavior of the structure was extremely satisfactory, with only minimal damage in the shear wall direction, and no significant strength loss in the frame direction, despite being taken to drift levels up to 4.5 percent, more than 100 percent higher than the design drift level. The test validated the Displacement-Based Design (DBD) approach used to determine the required strength and confirmed the low damage and low residual drift expected of the building.

712 citations

Journal ArticleDOI
TL;DR: A detailed literature review of semi-active control systems is provided in this article, which provides references to both theoretical and experimental research but concentrates on describing the results of experimental work, focusing on descriptions of the dynamic behavior and distinguishing features of various systems which have been experimentally tested both at the component level and within small-scale structural models.

656 citations

Journal ArticleDOI
TL;DR: In this paper, a brief review showed considerable differences in the quantity of rectangular hoops required by various seismic design codes in the potential plastic hinge regions of rectangular reinforced concrete columns and demonstrated very ductile behaviour when loaded by simulated seismic loading up to displacement ductility factors of at least 6, confirming the adequacy of the proposed design provisions.
Abstract: A brief review showed considerable differences in the quantity of rectangular hoops required by various seismic design codes in the potential plastic hinge regions of rectangular reinforced concrete columns. Tests conducted on four nearly full size reinforced concrete columns with a 550 mm (21.7 in) square cross section, various axial load levels, and various quantities of rectangular hoops, are described. The hoops were designed according to the recommendations of the draft New Zealand Concrete Design Code. The columns demonstrated very ductile behaviour when loaded by simulated seismic loading up to displacement ductility factors of at least 6, confirming the adequacy of the proposed design provisions. Considerable enhancement of flexural strength was observed over that calculated by normal code design procedures, but the enhancement could be accounted for a refined flexural strength analysis which included the effect of strain hardening of the longitudinal steel and the increase in strength and ductility of the confined concrete. Maximum compressive concrete strains in the range 0.016 to 0.026 were measured on the surface of the confined concrete core at the peak displacements.

592 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202377
2022142
2021370
2020337
2019329
2018331