Theoretical model and structural performance of assembled joint between circular CFDST column and composite beam
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(2020) 20:75
REVIEW ARTICLE
Theoretical model and structural performance of assembled joint between circular CFDST column and composite beam Lei Guo1 · Jingfeng Wang1,2 · Wanqian Wang1 Received: 24 December 2019 / Revised: 23 May 2020 / Accepted: 28 May 2020 © Wroclaw University of Science and Technology 2020
Abstract Circular concrete filled double skin steel tubular (CFDST) has broader application aspects in engineering practice due to its superior confinement and elegant architectural appearance compared with square CFDST. However, there is still lack of an effective and reliable assembled method to connect the circular CFDST column to the beam. This paper focused on the theoretical and structural behavior on the assembled joint between circular CFDST column and composite beam. A sophisticated theoretical model was proposed to evaluate the initial rotational stiffness and moment capacity of the assembled joint. This theoretical model firstly accounted for the curved end plate in bending considering the clamping forces of blind bolts. Furthermore, a simplified arch model was developed to assess the circular steel tube in compression and the stiffness coefficients related to the circular CFDST column determined by the load transfer mechanism were also involved in the theoretical model. Subsequently, an experimental investigation on such kind of joint was conducted as a basis to verify the developed numerical model, indicating the numerical model could well replicate the typical failure modes and hysteresis curves. Parametric analyses based on the validated numerical model were performed to identify the effects of various parameters on the typical assembled joint. The theoretical model was verified to be capable of predicting the initial stiffness and moment capacity of assembled composite joint to circular CFDST column by comparing with the numerically observed results. The theoretical and analytical results performed in this paper would be beneficial for the application of the assembled beam to column joint in CFDST structures. Keywords Circular concrete filled double-skin steel tubular · Prefabricated joint · Composite beam · Theoretical model · Parametric analysis
1 Introduction Accompanied by the scarcity of urban land resources, the building height gets higher and higher to cater the efficient usage with the limited land resources. Therefore, novel composite structures are developed to replace the traditional steel and reinforced concrete structures for achieving the structural safety and cost efficiency. Concrete-filled double skin steel tubular (CFDST) was originally applied in marine tunnels [1]. Recently, there is a growing trend for the CFDST to be utilized especially in high-rise building structures due * Jingfeng Wang [email protected] 1
School of Civil Engineering, Hefei University of Technology, Hefei 230009, Anhui Province, China
Anhui Key Laboratory of Civil Engineering Structures and Materials, Hefei 230009, Anhui Province, China
2
to its higher strength-to-weight ratio compared wit
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