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RISS 인기검색어
- 검색키워드
- 저자 : Paolo Spinelli (검색결과 2 건)
- 무료
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Pinching in Steel Rack Joints: Numerical Modelling and Eff ects on Structural Response
Federico Gusella,Maurizio Orlando,Paolo Spinelli 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.1
The structural behaviour of beam-to-column joints plays a key role in the seismic response of frame structures. Regarding to steel storage pallet racks, experimental tests have highlighted that the hysteresis loop of their joints is characterized by the pinching, with the consequence of a reduction of the dissipated hysteretic energy and load carrying capacity. In this paper the authors propose a simplifi ed numerical pinching model capable to simulate the mechanical response of beam-tocolumn joints under cyclic loads. To develop and check this model, several comparisons are performed with both literature data and experimental results of laboratory tests. The proposed model is characterised by three links placed in parallel: two “composed links” describe the non-linear bending moment-rotation curve of the joint, and a linear elastic link transfers the axial and shear force from the beam to the column. The model is appropriate for predicting the down-aisle seismic response of rack systems and it can be easily implemented in commercial software packages, commonly used for non-linear seismic vulnerability analyses. Moreover, features of the model can be estimated from a few structural data and it does not require to perform expensive cyclic experimental tests. For a deeper understanding of the eff ects of pinching in the seismic response and to highlight the potentiality of the proposed model a case-study example is also considered. The case-study concerns a rack system, whose beam-to-column joints are modelled using two numerical approaches which diff er in the deterioration of the rotational stiff ness of joints. Non-linear dynamic analyses, with simulated ground acceleration time-histories, have been carried.
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Experimental capacity of perforated cold-formed steel open sections under compression and bending
Maurizio Orlando,Giovanni Lavacchini,Barbara Ortolani,Paolo Spinelli 국제구조공학회 2017 Steel and Composite Structures, An International J Vol.24 No.2
This study evaluates the reliability of present European codes in predicting the collapse load of columns made with perforated cold-formed steel (CFS) profiles under combined axial load and bending. To this aim, a series of experimental tests on slender open-section specimens have been performed at varying load eccentricity. Preliminarily, stub column tests have also been performed to calculate the effective section properties of the investigated profile. By comparison of experimental data with code-specified M-N strength domains, the authors demonstrate that present code formulations may underestimate the collapse load of thin-walled perforated open sections. The study is the first step of a wider experimental and numerical study aimed at better describing strength domains of perforated CFS open sections.
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