سال انتشار: ۱۳۹۱

محل انتشار: دهمین همایش بین المللی سواحل، بنادر و سازه های دریایی

تعداد صفحات: ۱۳

نویسنده(ها):

Seyed Amin Vakili – Member Of Organization For Engineering Order Of Building North Khorasan Province – Ce_
Seyed Ehsan Vakili – Member Of Organization For Engineering Order Of Building North Khorasan Province
Nader Abdoli Yazdi – Department Of Civil Engineering Univrsity Of Yazd, Yazd, Iran
Hasan Azad Beygi – Department Of Civil Engineering Eshragh Higher Education Institute, Nors Khorasan , Iran

چکیده:

The aim of this dissertation is to introduce a new approximate procedure on the basis of the Newmark method, which can treat the structural stability problem without the aforementioned shortcomings. The emphasis of the methodology is that it has sufficient power to generalise different types of stability problems, and is well suited to the use of computers. The major objectives of this thesis are categorised in two parts. The first part, which constitutes the mainhypothesis and idea, is devoted to developing a procedure here in called the Modified Newmark Method. the response of these kind of structures under the loading, namely the relationship between the displacement field and the loading field, can be predicted by the solution of thesedifferential equations and on satisfying the given boundary conditions. When the effect of change of geometry under loading is taken into account in modeling of equilibrium state, then these differential equations are partially integrable in quartered. They also exhibit instabilitycharacteristics when the structures are loaded compressively. The purpose of this Paper is to represent the ability of the Modified Newmark Method toanalyses the flexural-tensional instability of strut for both bifurcation and non-bifurcation structural systems , and the results are shown to be very accurate with only a small number of iterations. The method is easily programmed, and has the advantages of simplicity and speeds of convergence and easily is extended to treat material and geometric nonlinearity including no prismatic members and linear and nonlinear spring restraints that would be encountered in frames. In this Paper these abilities of the method will be extended to the system of linear differential equations that govern strut flexural torsional stability