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The Structural Engineer, Volume 50, Issue 3, 1972
In this paper is presented a study on dynamic stability of thin-walled bars with open cross-section, subjected to compression by an axial force, composed from a static component and a variable one. The case of non-symmetric profiles is analysed in the first instance, to obtain general equations of vibratory motions; these are then particularized for profiles with an axis of symmetry, currently used in construction.
In the behaviour of structures under earthquake, the most effective role is played by the fundamental period of vibration of structures because it is one of the main parameters to determine the earthquake forces applied to the structure and it specifies the dynamic stability of the structure. In this paper'a simple approximate formula is proposed to calculate the fundamental period of vibration. The calculation with this formula is very short and easy. No mathematical background is necessary to apply the formula. In addition to the derivation and discussion of the formula, several examples showing its application are given.
The President: This must have been a most exciting job with many problems to overcome. It was a congested site, with restrictions of allowable pressures on the ground. The factors which influence the engineering design are quite amazing; I think you said that it was imperative to obtain a uniform pressure on the ground and that that particular restriction to some extent led you to adopt the curve columns.