Large displacement elastic-plastic analysis of plane frames with non-prismatic member of non-linearlly varying sections

Dissertant

Faris, Hamid Abd al-Mahdi

University

University of Technology

Faculty

-

Department

Department of Building and Construction Engineering

University Country

Iraq

Degree

Ph.D.

Degree Date

2002

English Abstract

In this investigation a theoretical analysis is presented for estimating the in-plane large displacement elastic-plastic stability behavior of steel frames having non-prismatic members of non-linearly varying sections and subjected to increasing static loads. The analysis adopts the beam-column approach and models the structural members as beam-column elements.

The formulation of the beam-column element is based on Eulerian approach allowing for the influence of the axial force on bending stiffness.

Also, changes in member chord length due to axial deformation and flexural bowing are taken into account. The stability and bowing functions are estimated using four methods, finite difference, finite elements, finite segments and exact method U5ing Bessel functions. Also, approximate results have been obtained by using approximate stability and bowing functions of non-nearly tapered members. Multi-purpose computer programs have been coded in Quick Basic language for carrying out the proposed analysis of structures with prismatic or non-prismatic members of non-linearly varying section. In order to verify the effectiveness of the present formulation, some case studies reported by previous researchers are utilized. The investigation is extended to study different influencing parameters on the elastic-plastic behavior of non-linear tapered members of frames.

These parameters are tapering ratio, type of variation, type o (supports and horizontal load ratio. As a result of this investigation; the beam column approach can be used in the analysis of plane frames with nonlinearly varying section, also the stability and bowing functions can be estimated using finite difference method, finite element method, exact method by Bessel function and by finite segment method.

The ultimate load capacity can be increased and tapering the prismatic members for the same weight can decrease the displacement.

Then, the use of non-linear tapered members in structures results in significant material saving.

Main Subjects

Civil Engineering

Topics

• Construction engineering
• Elasticity

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305620