Author: Leonhardt, Fritz;Schlaich, J
First published: N/A
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Leonhardt, Fritz;Schlaich, J
The Clean Air Act of 1956 stipulates minimum heights for industrial chimneys according to the size of the boiler plant and also requires higher flue gas exit velocities which
consequently produce chimneys of smaller diameter. On a multi-boiler plant the multi-flue chimney permits the maximum flue gas velocity to be achieved at all boiler loadings since each boiler has its own flue, however the beneficial aspects of the small diameter flue can be offset by the practical construction difficulties of freestanding brick linings of small diameter.
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.
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.