Sectional strength and design of double-skin composite walls withre-entrant profiled faceplates

• Published in: Thin-walled structures 2021-01, Vol.158, p.107196, Article 107196
• Main Authors: Tong, Jing-Zhong, Yu, Chao-Qun, Zhang, Lei
• Format: Article
• Language: English
• Subjects: Axial and out-of-plane bending behaviour; Interaction curve; Parametric analysis; Profiled double-skin composite wall; Sectional analysis model; Sectional strength
• ISSN: 0263-8231; 1879-3223
• DOI: 10.1016/j.tws.2020.107196

Profiled steel sheets are widely used in composite wall systems to form profiled double-skin composite walls (PDSCWs), serving as structural components in low- and medium-rise building structures. By using the profiled faceplates with re-entrant corrugations, the trough regions not only form vertical ribs to enhance the stability performance of the faceplates, but can also hook to the infilled concrete to eliminate the need for additional connecting elements. The sectional strength of the PDSCWs under combined axial and out-of-plane bending loads is investigated in this paper. A nonlinear finite element (FE) model is presented for simulating the combined axial and bending resistant behaviour, which is validated by comparing with independent series of tests. A numerical parametric study is conducted, which involves the parameters including faceplate thickness, wall depth, faceplate steel strength, infilled concrete strength and faceplate type, and the interaction curves between ultimate axial and bending resistance (N-M curves) are obtained based on extensive models with different eccentricities. By introducing a sectional analysis model which considers the local buckling effect of faceplates, the sectional axial and bending strength of PDSCWs is theoretically evaluated. By comparing the derived N-M interaction curve against FE results, it is found that the proposed design formulas are capable of conservatively predicting the ultimate resistance of the PDSCWs under combined axial and bending effects. Hence, these formulas can provide valuable references for designing the PDSCWs in practise. •PDSCWs with re-entrant faceplates can eliminate the need of additional connecting elements.•Finite element models are built and validated against test results.•Behaviour of PDSCWs is studied under combined axial and out-of-plane bending loads.•Sectional analysis method is developed to predict the PDSCW behaviour.•Interaction curves between axial and bending resistances are obtained for designs.