Analysis of Stiffened Tall Building Structures

[摘要] This thesis presents static and dynamic analyses of stiffened tall building structures. The structures dealt with include stiffened linked and coupled shear walls and cores stiffened by outrigger bracings. The discrete matrix approach is used to investigate the effects due to different degrees of base flexibility on the optimum locations of outriggers to minimise top drift and core moment. Investigations are carried out into the static behaviour of outrigger structures subjected to different lateral load cases including uniformly distributed load, point load, triangularly distributed load, polynomial distributed load and a combination of point and triangularly distributed load. A study of equal spacings of the outriggers is made. A multiple regression technique is applied to established results to develop formulae for the optimum locations of outriggers. An approximate solution for the static analysis based on the continuum method for multi-outrigger structures supported on both rigid and flexible foundation is presented. A comparison of the results is made with that based on drift minimisation and equally spaced outrigger using the discrete matrix approach. The field transfer matrix technique is used to investigate the static and dynamic behaviour of linked shear walls with multi-stiffening beams. In the determination of the natural frequencies of vibration, the effects of bending, shear and rotatory inertias are included in the analysis. It is shown that there is an analogy between the behaviour of stiffened linked shear walls and outrigger-braced structures, and the same The continuum technique for the analysis of coupled shear walls is extended to cover the cases of up to two intermediate stiffening beams and two different types of connecting beams allowing the estimation of the effects of these beams on structural stiffening in and behaviour of coupled shear walls supported on both rigid and flexible foundations. Finally, the 'continuum method' used earlier is employed to analyse the free bending of multi-outrigger-braced structures. The natural modes and frequencies of vibration are determined using the Galerkin technique. A comparison of results between the continuum method and that using the transfer matrix technique is made.

[发布机构] University:University of Glasgow

[关键词] Civil engineering