Author: Liu, Hai-xin
Title: Experimental investigation on circular stub columns using high strength materials
Advisors: Chan, Tak-ming (CEE)
Degree: M.Sc.
Year: 2019
Subject: Tubular steel structures
Steel, Structural
Hong Kong Polytechnic University -- Dissertations
Department: Department of Civil and Environmental Engineering
Pages: x, 60 pages : color illustrations
Language: English
Abstract: High strength steel tubular member is a strong alternative to conventional cross-section of steel structure for its excellent torsional rigidity, high strength-to-weight ratio, and aesthetic appearance. As its promotion, concrete-filled steel tubular member has combined the material and structural advantages of steel and concrete. The concrete core prevents the external steel tube from inward buckling, while in turn tube provides confinement pressure to the core. Commonly used cross-section shapes include square, rectangular and circular, which have its own advantages and limitations. Square and rectangular sections can provide a better workability in fabrication and connection of structural members, while the circular shape can provide a uniform confinement pressure for the concrete core to achieve a better structural efficiency. Though many researchers have conducted extensive research on the circular tubular members, the research on the circular tubular members using high strength material is still limited. The experimental investigation in this dissertation included 23 tensile coupon tests, 30 concrete cylinder tests, 16 stub column tests on circular hollow sections, and 36 stub column tests on circular concrete-filled steel tubes. The specimens were categorised into three series according to their nominal yield strength of steel: Series N (460 MPa), Series H (690 MPa), and Series U (960 MPa). On the basis of material property tests, the measured steel yield strength ranges from 535 MPa to 987 MPa, while the compressive cylinder strength of concrete varies from 31 MPa to 98 MPa. The stub columns were tests under uniaxial concentric compression. Finite element models (FEMs) was developed using a commercial finite element software ABAQUS to replicate the hollow section tests. Results from FEMs and tests are in great agreement, indicating the ability of FEMs to simulate the behaviours of CHSs tests. Furthermore, the experimental results were compared to the design methods proposed by American specification and Eurocode. In the comparison, the ultimate capacities were determined according to different slenderness limits stipulated in different codes to evaluate the applicability of the current codes of practice.
Rights: All rights reserved
Access: restricted access

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