Damage Analyses of Replaceable Links in Eccentrically Braced Frame (EBF) Subject to Cyclic Loading

Yin, Zhanzhong; Feng, Dazhe; Yang, Wenwei

doi:10.3390/app9020332

Cited by 12 publications

(12 citation statements)

References 60 publications

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“…According to studies by Yin et al on the replaceable links in eccentrically braced frame subject to cyclic loading, it was observed that the links in this shear device had inelastic deformation concentrated in the link showing extremely stable hysteresis behavior, and damaged links were replaced easily as end-plate connections were adopted. This paper proposes a piezoceramic patch transducer-based active sensing approach to monitor the crack onset and development of the EBF when subjected to dynamic loadings [23]. Numerous studies have been carried out regarding the effects of SSI on different structures and calculating their damage index.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Damage Index of Eccentrically-Braced Frames according to Link Beam’s Length with Soil-Structure Interaction Effects

Rahami

Fadaee

Hezaveh

2021

NMCE

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Due to features such as ductility and stiffness, the eccentrically-braced frames(EBF) have a good performance against seismic loads and have been considered by designers. Previous studies indicate that the soil underlying the structures affects their seismic behavior. In the case of EBFs, the link beam plays an imporatnt role in the seismic behavior of the system and thus, investigation into the effect of the geometric characteristics of the link on general behavior of the system, would be of utmost significance. In this respect, length of the link beam has been considered as the main variable in this study, taking the effects of soil-structure interaction (SSI) into account.Dynamic time-history analyses considering different lengths for the link beam with and without inclusion of the SSI, have been conducted, aiming to obtain damage indices. The results indicate that as the length decreases, in retrun, damage index (DI)increases and vice versa. Additionally, it was found that when the ratio of length of the link to that of the bay is approximately equal to 0.5, the DI values drop significantly. Also, results showed that considering the effect of SSI, applied general changes on the value of D, and showed different effects at various lengths of the link beams.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Damage Index of Eccentrically-Braced Frames according to Link Beam’s Length with Soil-Structure Interaction Effects

Rahami

Fadaee

Hezaveh

2021

NMCE

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“…The work [19] analyzed the change of stress (measured by strain gauges) in bolts, depending on the change in the bolt head surface (the head was cut off to simulate a corrosion defect). Stress concentration issues, especially around welds of connections subjected to cyclic loading (e.g., seismic), were analyzed in [20].…”

Section: Introductionmentioning

confidence: 99%

Detection of Anomaly in a Pretensioned Bolted Beam-To-Column Connection Node Using Digital Image Correlation and Neural Networks

2020

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Bolted connections, commonly applied in civil engineering structures, have many advantages. According to current trends, bolted connections in steel structures are designed as prestressed ones. Unfortunately, precise control of the prestressing forces is difficult, while the loosening (due to, e.g., dynamic interactions) may be dangerous for the entire structure. There are many control methods applied in the determination of the tightening level, among which are vision-based methods. The methods described so far enable—thanks to image processing—damage detection in connections with visible connectors. The level of the considered loosening was significant—in many cases, changes in connectors were visible with the naked eye, whereas the procedure presented here enables the detection of very small changes, impossible to detect without manual inspection of every single connector. It is not necessary to observe the connectors directly, but the near surrounding of the node should be visible. As a measurement technique, Digital Image Correlation (DIC) was used. The applied measurement method and the high sensitivity of the presented procedure makes the presented research original. The currently presented procedure, employing Artificial Neural Networks, based on the laboratory examination of an example of one selected beam-to-column connection of a two-story steel portal frame, was perfect in the detection of a change and in the determination of the number of loosened rows, 95%, and their location, 94%, with the number of false alarms below 1%.

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“…The validity of this method has been verified by eight near-full-size EBF tests under quasi-static cyclic loading. In addition, Stephens and Yin [39,43] recommended a bolted end plate connection detail for replaceable links that utilized fillet welds at the link-to-endplate interface recently.…”

Section: Introductionmentioning

confidence: 99%

“…In past researches, there were many on the end plate connection type energy dissipation beam, but few on the web connection type. Based on the previous researches [42][43][44][45], it can be found that the failure of the end plate connection type energy dissipation link is mainly due to the failure of the flange and the failure of the weld, which reduces the constraint of the flange on the web and further leads to the reduction of the bearing capacity of the link. This paper presents an experimental research program that utilizes web connections at the link-to-beam interface.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Energy Dissipation Performance and Failure Mode of Web-Connected Replaceable Energy Dissipation Link

et al. 2019

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In the current design method of the eccentrically braced frame structure, the energy dissipation link and the frame beam are both designed as a whole. It is difficult to accurately assess the degree of damage through this method, and it is also hard to repair or replace the energy dissipation link after strong seismic events. Meanwhile, the overall design approach will increase the project’s overall cost. In order to solve the above mentioned shortcomings, the energy dissipation link is designed as an independent component, which is separated from the frame beam. In this paper, the energy dissipation link is bolted to the web of the frame beam. Both finite element simulation and test study of eight groups of energy dissipation links have been completed to study their mechanical behaviors, and the energy dissipation links have been studied in the aspects of length, cross section, and stiffener spacing. The mechanical behaviors include the energy dissipation behavior, bearing capacity, stiffness, and plastic rotation angle. The results indicate clearly that the hysteretic loop of links in the test and finite element analysis is relatively full. By comparing the experimental and finite element simulation data, it can be found that the general shape and trend of hysteretic loop, skeleton curve, and stiffness degradation curve are basically the same. The experiment data explicitly shows that the energy dissipation link of web-connected displays good ductility and stable energy dissipation ability. In addition, the replaceable links possess good rotational capacity when the minimum rotation angle of each specimen in the test is 0.16 rad. The results of the experiment show that the energy dissipation capacity of the link is mainly related to the section size and the stiffening rib spacing of the link. The energy dissipation ability and deformation ability of the link is poorer as the section size becomes larger; meanwhile, these abilities are reduced with the decrease of the stiffening spacing. The experiment result shows that the damage and excessive inelastic deformations are concentrated in the link to avoid any issues for the rest of the surrounding elements, and the links can be easily and inexpensively replaced after strong seismic events. The results are thought provoking, as they provide a theoretical basis for the further study of the eccentrically braced frame structure with replaceable links of web-connected. In future work, the author aims to carry out his studies through optimized design methodology based on the yielding criterion.

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Damage Analyses of Replaceable Links in Eccentrically Braced Frame (EBF) Subject to Cyclic Loading

Cited by 12 publications

References 60 publications

Evaluation of Damage Index of Eccentrically-Braced Frames according to Link Beam’s Length with Soil-Structure Interaction Effects

Evaluation of Damage Index of Eccentrically-Braced Frames according to Link Beam’s Length with Soil-Structure Interaction Effects

Detection of Anomaly in a Pretensioned Bolted Beam-To-Column Connection Node Using Digital Image Correlation and Neural Networks

Experimental Study on Energy Dissipation Performance and Failure Mode of Web-Connected Replaceable Energy Dissipation Link

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