Performance of Short and Slender Ultra High Performance Concrete filled Steel Tube and Double Skinned Columns
Loading...
Authors
Haidar, Ali
Date
Type
thesis
Language
eng
Keyword
UHPC , UHPC-filled steel tube , UHPC-filled double skin steel tube , Composite column
Alternative Title
Abstract
This thesis examines the axial compression load-carrying capacity of ultra-high performance fiber reinforced concrete (UHPC)-filled steel tubes (UHPC-FSTs) and double skin systems, including short and slender columns. The first part of the study investigates experimentally and numerically the axial loading behavior of 135 MPa UHPC-filled double skin steel tubular columns (UHPCFDSTs). A total of 37 short stub columns were tested, including totally filled control tubes and tubes filled with normal- and high-strength (NSC and HSC) concrete. The study examined the effects of outer tube diameter-to-thickness (Do/to) ratio and inner-to-outer tube diameter ratio on the axial capacity of UHPCFDSTs. A nonlinear finite element model using the computer program LS-DYNA was also developed and verified. The experimental results were compared against the Canadian CSA (CAN/CSA) S16:19 code provisions which were found to overestimate the axial capacity by 12-56%. A modification factor was developed and is recommended to be introduced in the code equation.
The second part of the study investigates slenderness effects in UHPC-FST columns. A robust three-dimensional nonlinear finite element model was developed using LS-DYNA to simulate the slender columns under concentric axial compressive loads and was validated using a large experimental database. An extensive parametric study was then performed, varying slenderness ratio (kL/r) based on column length (L) where r is the radius of gyration, diameter-to-thickness ratio (D/t) of the steel tube, effective length factor (k), and steel yield strength (fy). The CAN/CSA S16:19 code provisions grossly underestimated the load-carrying capacity of slender UHPC-FSTs by up to 48% at k= 2.0. A modification to CAN/CSA S16:19 equation was proposed based on multiple regression analysis of the results of the parametric study.
Description
Citation
Publisher
License
Queen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canada
ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.
Attribution-NonCommercial-NoDerivs 3.0 United States
ProQuest PhD and Master's Theses International Dissemination Agreement
Intellectual Property Guidelines at Queen's University
Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.
Attribution-NonCommercial-NoDerivs 3.0 United States