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A method is presented for analysing portal frames of several continuous spans, attention being directed in the main to frames in which individual bays have symmetrical roof members.
In this paper, it is assumed that the shear stiffness of a panel can be taken as distributed uniformly along the strut. "Secant" type formula (I), (2), (3) and (4)
provide the crippling load of a strut with light shear bracing for the simpler case of equal eccentricities of end load; formulae (I), (4), (5) and (6) deal with the more general case of different end eccentricities and a uniform transverse loading. These formulae differ from those for a strut with heavy shear bracing only in an extra term incorporating the shear stiffness. Expressions for shear stiffness of the usual forms of light shear bracing, such as lattice bracing, with and without posts, and batten bracing with equal and unequal chords, are given by formulae (7) to (12).
Mr. Dorman: ‘Judging by the number of enquiries relating to the merits of various roofing systems received by the BCSA central office, Dr. Buchholdt is to be congratulated on producing a timely paper. It will be of considerable value to have this present study, with its summary of the state of the art in the design of tension
structures, and one would certainly hope that this paper will go some way towards bridging the “credibility gap” between research and development activity on the one
hand, and design practice on the other.'