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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, a knee-braced moment frame (KBMF) is designed to yield and buckle under seismic loads, followed by plastic hinging of beams at the ends of the beam segments outside the knee portions.
Abstract: The design and behavior of a ductile structural system called a knee-braced moment frame (KBMF) are presented in this paper. The design of this structural system is based on a capacity-design concept that results in ductile behavior. For this system, the frames are designed so that the knee braces will yield and buckle under seismic loads; this is followed by plastic hinging of beams at the ends of the beam segments outside the knee portions. Through this concept, inelastic activities are confined to the designated elements. The knee braces also provide much less obstruction than the braces of conventional systems, making this structural system architecturally attractive. The design concept of this new structural system is addressed first. Results from an experimental study into the seismic behavior of the proposed system are then presented. Two approximately half-scale KBMF specimens were tested. The load-deformation characteristics obtained from the test indicate that the newly developed system can be a...

32 citations

Journal ArticleDOI
TL;DR: In this article, the authors derived the amount of transverse reinforcement necessary so that hoop fracture and fatigue fracture of the longitudinal bars coincide for critical earthquake motions, using an energy-based approach coupled with notions of low-cycle fatigue.
Abstract: Potential plastic hinge zones in confined concrete columns require that sufficient transverse reinforcement be provided to avert undesirable failure modes and to ensure dependable inelastic (ductile) behavior in earthquakes. Conventional code–based approaches for detailing confining reinforcement are founded on the premise of preserving axial load before and after spalling of the cover concrete. Such formulations account for neither the cyclic actions nor the duration effects of ground motions. This paper derives the amount of transverse reinforcement necessary so that hoop fracture and fatigue fracture of the longitudinal bars coincide for critical earthquake motions. An energy–based approach coupled with notions of low–cycle fatigue are used for this purpose.

32 citations

Journal ArticleDOI
TL;DR: In this article, the seismic performance of a composite moment resisting frame (MRF) comprised of concrete filled tube (CFT) columns and wide flange beams was investigated experimentally.
Abstract: The seismic performance of a composite moment resisting frame (MRF) comprised of concrete filled tube (CFT) columns and wide flange beams was investigated experimentally. The four-story composite MRF test structure was designed using performance-based design concepts. The performance objectives include achieving: (1) the operational performance level under the frequent occurrence earthquake; (2) the life safety performance level under the design basis earthquake; and (3) the collapse prevention performance level under the maximum considered earthquake. The hybrid pseudodynamic test method was used to subject the test structure to these various seismic input levels. P-Δ effects associated with the gravity frames in the prototype building were included analytically in the tests. Results from the tests indicated that the structural performance under the simulated seismic loading was consistent with the expected performance for all three earthquake levels, indicating that effective seismic performance of comp...

32 citations

Journal ArticleDOI
TL;DR: In this paper, an analytical study is performed to evaluate the effect of shear wall area to floor area ratio on the seismic behavior of mid-rise RC structures, and the analytical results indicate that at least 1.0% shearwall ratio should be provided in the design of midrise buildings to control the drift.
Abstract: An analytical study is performed to evaluate the effect of shear wall area to floor area ratio on the seismic behavior of midrise RC structures. For this purpose, 24 midrise building models that have five and eight stories and shear wall ratios ranging between 0.51 and 2.17% in both directions are generated. Then, the behavior of these building models under earthquake loading is examined by carrying out nonlinear time history analyses. In the analyses, seven different ground motion records are applied to the building models, and the average of the obtained data is used in the evaluation of the seismic performance. Main parameters considered in this study that affect the overall seismic performance of the buildings are the roof and interstory drifts and the base shear responses. The analytical results indicate that at least 1.0% shear wall ratio should be provided in the design of midrise buildings to control the drift. In addition, when the shear wall ratio increases beyond 1.5%, it is observed th...

31 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232
20223
202113
20209
201916
201813