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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 9/10
PROCEEDINGS OF THE FOURTH INTERNATIONAL CONFERENCE ON CIVIL AND STRUCTURAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Paper X.3

Aids for the Conceptual Design of Prestressed Membrane Structures

D.A. Chamberlain

Department of Civil Engineering, City University, London

Full Bibliographic Reference for this paper
D.A. Chamberlain, "Aids for the Conceptual Design of Prestressed Membrane Structures", in B.H.V. Topping, (Editor), "Proceedings of the Fourth International Conference on Civil and Structural Engineering Computing", Civil-Comp Press, Edinburgh, UK, pp 15-20, 1989. doi:10.4203/ccp.9.10.3
Abstract
This paper covers the theory and implementation of a Computer Aided Geometric Modelling (CAGM) facility, which has been developed specifically for processing prestressed membrane fields free of lateral loading. A novel spatial sketching device is described, which enables the operator to define the curved boundaries of a trial field. From this boundary data, the shape of the field is determined automatically. Using a Mohr's circle type representation for the normal curvature-surface torsion regime at vertices and an approximate energy function, trial fields are evaluated for intensity of the essential anticlastic mechanism. The internal region is defined by diagonal shaping curves, which also assist in the graphical representation of the form. A four sided field is evaluated in an illustrative case study.

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