Inelastic Postbuckling and Cyclic Behavior of Tubular Braces

[+] Author and Article Information
B. Asgarian

Civil Engineering Faculty, P.O. Box19967-15433  K.N. Toosi University of Technology, Tehran, Iran

A. A. Aghakouchack

Civil Engineering Department, P.O. Box14155-4838  Tarbiat Modarres University, Tehran, Iran

R. G. Bea

Department of Civil and Environmental Engineering, University of California at Berkeley

J. Offshore Mech. Arct. Eng 127(3), 256-262 (Feb 18, 2005) (7 pages) doi:10.1115/1.1904637 History: Received September 03, 2001; Revised February 18, 2005

A nonlinear fiber element for the simulation of buckling, post buckling, and hysteric responses of tubular struts is formulated and implemented in the nonlinear program DRAIN-3DX . In this element both material and geometric nonlinearities are considered. The element is applied to simulate post buckling and hysteric response of pinned and fixed tubular struts subjected to cyclic loading. The results are in good agreement with available results, i.e., experiment and other analytical models data in terms of buckling load, load-deformation curve, strength, and stiffness degradation.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Jacket type offshore structure

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Figure 2

Portal and struts

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Figure 3

Typical strut member behavior

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Figure 5

Segment and fiber in a tubular member

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Figure 6

Geometric characteristic of the element

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Figure 7

Basic system degree of freedom

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Figure 8

Element degree of freedom

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Figure 9

Buckling load prediction by element E16 and AISC formula

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Figure 10

(a) and (b) Post buckling behavior of a tubular struts with l∕r=80 using EL. E. 16

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Figure 11

(a) and (b) Post buckling curves for tubular struts with three different slenderness ratios using a fiber element

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Figure 12

Post buckling behavior of fixed ended tubular struts tested by Sherman

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Figure 13

(a) and (b) Analystical hysteretic behavior of brace No. 2 tested by Zayas using new element; (c) and (d) Experimental results (23)

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Figure 14

(a) Analytical results using FEM (26); (b) Analytical results using the Maison model (9,24)

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Figure 15

Buckling load in each cycle



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