Structures of limited ductility

Group, NZSEE Study

doi:10.5459/bnzsee.19.4.285-336

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…In September 2016, the First International Resilience workshop (IRW2016) was held in Turin, Italy, exploring new directions based on resilience-based design from scholars in the Americas, Asia, and Europe [7]. In April 2017, the theme conference "The Next Generation of Low Damage and Resilient Structures" was held in Wellington, New Zealand, discussing research directions and trends for improving structural seismic performance [8]. The research focus in the field of earthquake engineering is shifting from resisting earthquakes to reducing post-earthquake damage and impacts.…”

Section: Introductionmentioning

confidence: 99%

Research Review on Earthquake Resilient Structures

Zhang¹

2023

HSET

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As researchers summarized their experiences with earthquake disasters, they found that the traditional seismic design concept of only regarding preventing collapse of structures under earthquake loads as the primary seismic defense objective for structures, has deficiencies in post-earthquake use and repair. Therefore, the concept of resilient structure design was proposed, which enables structures to quickly repair to pre-earthquake functional levels after earthquakes. Currently, the concept of resilience is gradually becoming the core theory of seismic design. This paper reviews the shortcomings of traditional seismic design concepts, introduces the two core objectives of resilient structure design, namely "reducing post-earthquake residual deformation" and "reducing post-earthquake structural damage and damage concentration." Resilient structures are mainly classified into rocking structures, structures with self-centering braced, and structures with replaceable member according to their implementation methods. The principles and research progress of these three structures are summarized. The deficiencies of existing building structural seismic performance are analyzed, and the reinforcement technology and practical engineering extension applications of the resilience concept in the reinforcement of existing structures are introduced. The prospects of the resilience concept in interdisciplinary research, post-disaster structural damage analysis, practical engineering applications, and other aspects are proposed.

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Section: Introductionmentioning

confidence: 99%

Research Review on Earthquake Resilient Structures

Zhang¹

2023

HSET

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Ductility Research of Reinforced Concrete Beams Strengthened with CFRP

Chen

Huang

Zheng

et al. 2004

KEM

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Recently Carbon Fiber Reinforced Polymer (CFRP) is used to strengthen structural parts of reinforced concrete bridges. Nowadays, the research in this area is not so deep and mature although lots of experts all over the world have done a great deal of tests and theory analysis about strengthening the reinforced concrete beams by using CFRP. Especially, there is no further research on the ductility of RC beams strengthened with CFRP. This paper is based on our past research, to test and discuss the ductility of RC beams strengthened with CFRP. A series of RC beams were strengthened with CFRP and tested. According to comparison of the P~V curves, mid-span deflection, cracking load, strain within different teams, the authors analyze the ductility of the beams. It shows that the ductility of RC beams using the CFRP can be decreasing. This phenomenon must be paid attention in the construction. Finally, some conclusion and future works are given. IntroductionThe structure will go into elastic and plastic deformation when in the intense earthquake situation. Compared with the elasticity, the deformation of plasticity is too large to make the structure crack, and debond or even damage. On the other hand, because of the decreasing of structure stiffness on the elastic and plastic state, the period of self-oscillation increases. It changes the earthquake reacting characteristic of the structure. The non-elasticity un-recoverable distortion may consumes the input earthquake energy and decreases the affection of earthquake on the structure. On the nonlinear state, whether the structure is damaged or not is decided by the deformation of plasticity or dissipation energy instead of the intensity. Because one can not use the intensity condition to evaluate the anti-earthquake ability of the structure. To efficiently use the dissipation energy ability of the structural nonlinear deformation, at the same time, avoiding the damage caused by over large intense loss, over big plastic deformation and over long crack, it is

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A comparison of the behaviour of reinforced concrete beam-column joints designed for ductility and limited ductility

Park

Dai

1988

BNZSEE

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Four beam-interior column Units were designed, constructed and tested subjected to simulated earthquake and gravity loading. One Unit followed the requirements of the New Zealand concrete design code NZS 3101:1982 for structures designed for ductility. The other three Units only partly followed the requirements of NZS 3101, in order to obtain information on the behaviour of beam-column joints of limited ductility. Plastic hinging was designed to occur in the beams. The major test variables were the quantity of horizontal and vertical shear reinforcement in the beam-interior column joint cores and the diameter of the beam longitudinal reinforcing bars passing through the joint cores. The test results indicted that the current NZS 3101 detailing requirements for shear and bond in the beam-interior column joint core regions of ductile reinforced concrete frames could be relaxed.

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Structures of limited ductility

Abstract: This report is the result of deliberations of the Society's Study Group for structures of limited ductility.

Cited by 3 publications

References 21 publications

Research Review on Earthquake Resilient Structures

Research Review on Earthquake Resilient Structures

Ductility Research of Reinforced Concrete Beams Strengthened with CFRP

A comparison of the behaviour of reinforced concrete beam-column joints designed for ductility and limited ductility

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