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S.R. Atashipour¹, U.A. Girhammar¹ and N. Challamel²

¹Division of Structural and Construction Engineering-Timber Structures, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Sweden
²LIMATB, Université Européenne de Bretagne, University of South Brittany, Lorient, France

doi:10.4203/ccp.108.259

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S.R. Atashipour, U.A. Girhammar, N. Challamel, "The Effect of Weak Shear Webs on the Deformations of Timber Box Type Beams", in J. Kruis, Y. Tsompanakis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 259, 2015. doi:10.4203/ccp.108.259

Keywords: partial composite interaction, shear slip, deflection, stabilising wall element, ANSYS.

Summary

This paper deals with deflection analysis of a deep composite box beam due to in-plane shear deformations, especially the modelling of the shear deformations in the webs is considered. The beam is composed of three framing members with sheathings on both sides. The sheathings or webs between the framing members are modelled as shear media with equivalent slip moduli corresponding to the partially composite beam model with three separated layers and two interlayer slip areas. The minimum total potential energy principle is employed to obtain the governing equilibrium equations and corresponding boundary conditions. The coupled set of governing equations is recast into an uncoupled form and solved explicitly together with the corresponding boundary conditions. The closed-form solutions obtained are compared to those based on the conventional beam theories. It is shown that the model is capable of predicting accurately the deflections for a wide range of geometry and property parameters, especially for small shear stiffness (slip modulus) values for the webs. The formula for the deflection is reduced to the Timoshenko formula for full composite interaction when the shear slip modulus of the web approaches infinity. Comparative numerical results are presented to show the influence of bending deformations, shear deformations in the framing layers and the in-plane shear deformations in the sheathings.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 108 PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: J. Kruis, Y. Tsompanakis and B.H.V. Topping Paper 259 The Effect of Weak Shear Webs on the Deformations of Timber Box Type Beams S.R. Atashipour¹, U.A. Girhammar¹ and N. Challamel² ¹Division of Structural and Construction Engineering-Timber Structures, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Sweden ²LIMATB, Université Européenne de Bretagne, University of South Brittany, Lorient, France doi:10.4203/ccp.108.259 purchase the full-text of this paper Full Bibliographic Reference for this paper S.R. Atashipour, U.A. Girhammar, N. Challamel, "The Effect of Weak Shear Webs on the Deformations of Timber Box Type Beams", in J. Kruis, Y. Tsompanakis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 259, 2015. doi:10.4203/ccp.108.259 Keywords: partial composite interaction, shear slip, deflection, stabilising wall element, ANSYS. Summary This paper deals with deflection analysis of a deep composite box beam due to in-plane shear deformations, especially the modelling of the shear deformations in the webs is considered. The beam is composed of three framing members with sheathings on both sides. The sheathings or webs between the framing members are modelled as shear media with equivalent slip moduli corresponding to the partially composite beam model with three separated layers and two interlayer slip areas. The minimum total potential energy principle is employed to obtain the governing equilibrium equations and corresponding boundary conditions. The coupled set of governing equations is recast into an uncoupled form and solved explicitly together with the corresponding boundary conditions. The closed-form solutions obtained are compared to those based on the conventional beam theories. It is shown that the model is capable of predicting accurately the deflections for a wide range of geometry and property parameters, especially for small shear stiffness (slip modulus) values for the webs. The formula for the deflection is reduced to the Timoshenko formula for full composite interaction when the shear slip modulus of the web approaches infinity. Comparative numerical results are presented to show the influence of bending deformations, shear deformations in the framing layers and the in-plane shear deformations in the sheathings. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £75 +P&P)
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