Date of Award

Fall 2016

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Civil & Environmental Engineering

Committee Director

Zia Razzaq

Committee Member

Duc T. Nguyen

Committee Member

Julie Z. Hao

Committee Member

Mojtaba B. Sirjani

Abstract

This dissertation presents the outcome of a theoretical and experimental study of the dynamic as well as the quasi-static elasto-plastic behavior of a steel building sub-assemblage including carbon fiber reinforced polymer (CFRP) retrofitting. The steel sub-assemblage consists of a beam-column attached to a pair of beams at its top end while its bottom end is fixed. An apparatus is constructed and used for conducting a series of experiments by applying a lateral impact load on the beam-column in the presence or absence of a static axial load. An innovative procedure for determining the shape of the forcing function caused by the impact load is then developed. A mathematical prediction model based on a partial differential equation of flexural dynamic equilibrium is formulated including new nonlinear terms to account for the elasto-plastic behavior of both a steel cantilever as well as a steel building sub-assemblage. To solve the materially nonlinear partial differential equation of equilibrium, an iterative finite-difference solution algorithm is formulated and is coupled with a tangent stiffness scheme to enforce cross-sectional axial force and flexural equilibrium conditions. The experimental results are found to be in good agreement with the predicted behavior for both non-retrofitted and CFRP-retrofitted steel building sub-assemblages. It is found that the maximum impact load to develop a dynamic plastic hinge in the beam-column of the sub-assemblage decreases in the presence of an axial load for non-retrofitted sub-assemblage. Also, for the CFRP-retrofitted sub-assemblage, the increase in the maximum impact load capacity is less than that found for the case of quasi-static loading.

Rights

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

DOI

10.25777/nbvm-6a63

ISBN

9781369506082

Share

COinS