Experimental study on seismic performance of new earthquake-resilient semi-rigid joint

doi:10.3785/j.issn.1008-973X.2023.06.004

Journal of ZheJiang University (Engineering Science)

2023, Vol. 57

Issue (6): 1090-1099 DOI: 10.3785/j.issn.1008-973X.2023.06.004

Experimental study on seismic performance of new earthquake-resilient semi-rigid joint

Zhi-an JIAO1,2(

),Jian-peng WEI1,2,Yang GUO1,2,Liang-jun DAI1,2,Li-min TIAN3,*(

)

1. Anhui Province Key Laboratory of Green Building and Assembly Construction, Anhui Institute of Building Research & Design, Hefei 230031, China
2. Anhui Construction Engineering Group, Hefei 230022, China
3. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

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Abstract

A new type of semi-rigid joint with recoverable function was proposed, in order to realize the rapid recovery of building functions after earthquake. The new joints were mainly composed of T-shaped energy dissipation plates, prefabricated beams and columns with hinges, and group of high-strength bolts. Four specimens of the new joint and one comparison specimen with welding joints in the same size were tested by reciprocating load tests. The seismic performance of the new joint was investigated, and the influence of the energy dissipation zone parameters such as section area, length and section moment of inertia on the hysteretic performance was analyzed. Results show that the new joints have better carrying capacity, energy consumption capacity and ductility than welding joints. In the test, the inelastic deformation is mainly concentrated on the energy dissipation plate, and the main structure is basically intact. Replacing the T-shaped energy dissipation plate can quickly restore the structure function. Different length and moment of inertia of the energy dissipation zone show different damage characteristics and seismic performance. A simple calculation method of new joint design was proposed, the proposed method can effectively predict the mechanical performance and destruction characteristics of various types of new joints under reciprocating load. Compared the yield load and ultimate load calculated by using the proposed method with the test record, the maximum errors of the two were 2.5% and 12.8% respectively.

Key words： prefabricated joint earthquake resilient structure seismic performance reciprocating load test theoretical analysis

Received: 21 June 2022 Published: 30 June 2023

CLC:

TU 391

Fund: 国家自然科学基金资助项目(52178161，51608433)；绿色建筑与装配式建造安徽省重点实验室资助课题(2021-JKYL-001)；安徽建工集团资助课题(2021-19JF)；2022年度省住房城乡建设科学技术计划项目资助课题(2022-YF164)

Corresponding Authors: Li-min TIAN E-mail: Zhian_Jiao@163.com;tianlimin701@163.com

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Cite this article:

Zhi-an JIAO,Jian-peng WEI,Yang GUO,Liang-jun DAI,Li-min TIAN. Experimental study on seismic performance of new earthquake-resilient semi-rigid joint. Journal of ZheJiang University (Engineering Science), 2023, 57(6): 1090-1099.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2023.06.004 OR https://www.zjujournals.com/eng/Y2023/V57/I6/1090

新型可恢复功能半刚性节点抗震性能试验研究

为了实现建筑功能的震后快速恢复，提出新型可恢复功能半刚性节点. 新型节点主要由T形耗能板、带铰的预制梁柱和高强螺栓群组成. 对4个该新型节点试件及1个同尺寸的焊接节点对比试件进行往复加载试验，考察新型节点的抗震性能，分析耗能区截面面积、长度、截面惯性矩对新型节点滞回性能的影响. 结果表明：新型节点比焊接节点具备更好的承载能力、耗能能力和延性. 在试验中，非弹性变形主要集中在耗能板，主体结构基本无损伤，更换T形耗能板能够快速恢复结构功能. 不同耗能区长度、惯性矩表现出不同的破坏特征与抗震性能. 提出简单的新型节点设计计算方法，可以有效预测各类新型节点在往复荷载作用下的受力性能与破坏特征；对比采用所提方法计算与试验记录得出的屈服载荷、极限载荷，两者最大误差分别为2.5%、12.8%.

关键词： 装配式节点, 可恢复功能防震结构, 抗震性能, 往复加载试验, 理论分析

Fig.1 Structural chart of new earthquake-resilient semi-rigid joint

Fig.2 Structure size diagram of joint specimens

Tab.1 Dimensions of T type plates on new joint specimens

Tab.2 Performance test results of steel materials

Fig.3 Test setup of reciprocating load tests

Fig.4 Curve of loading scheme for reciprocating load tests

Fig.5 Arrangement of measurement devices of joint specimens

Tab.3 Results of force analysis and calculation about new joint specimens (F_T= F_uT)

Fig.6 Deformation characteristics of welding joint specimen (WS)

Fig.7 Deformation characteristics of new joint specimens

Fig.8 Comparison diagram of hysteretic curves with different joint specimens

Fig.9 Load-displacement skeleton curves of joint specimens

Tab.4 Bearing capacity and ductility coefficient of joint specimens

Fig.10 Stiffness reduction curves of joint specimens

Fig.11 Cumulative energy consumption curves of joint specimens

Fig.12 Curves of equivalent viscous damping coefficient

Fig.13 Hysteresis curves of two types of joint specimens at sensor No. 1

Fig.14 Displacement characteristics of two types of joint specimens

Fig.15 Strain curves of four sections for two types of new joints specimens

Tab.5 Strain of four sections for two types of new joints specimens

Tab.6 Comparison of theoretical and experimental results about new joint specimens


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