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Properties Of Concrete

Developments and advanced applications of concrete-filled steel tubular (CFST) structures: Members

In practice, concrete-filled steel tubes (CFST) are often subjected to torsion. To date, such a problem however has not been addressed satisfactorily by design codes. The present study is thus an attempt to study the torsional behaviours of concrete-filled thin-walled steel tubes. ABAQUS software is used in this paper for the finite element analysis (FEA) of CFST subjected to pure torsion. A comparison of results calculated using this modelling shows good agreement with test results. The FEA modelling was used to investigate the influence of important parameters that determine the ultimate torsional strength of the composite sections. The parametric studies provide information for the development of formulae to calculate the ultimate torsional strength, as well as the torsional moment versus torsional strain curves of the composite sections.

Performance of concrete-filled thin-walled steel tubes under pure torsion

Finite element modelling of concrete-filled steel stub columns under axial compression

Proper material constitutive models for concrete-filled tube (CFT) columns are proposed and verified by the nonlinear finite element program ABAQUS against experimental data. The cross sections of the CFT columns in the numerical analysis are categorized into three groups, i.e., circular section, square section, and square section stiffened by reinforcing ties. Via the numerical analyses, it is shown that for circular CFT columns, the tubes can provide a good confining effect to the concrete especially when the width-to-thickness ratio D/t is small (say D/t 30). The confining effect of square CFT columns with reinforcing ties is enhanced by the use of reinforcing ties especially when the tie spacing is small and the tie number (or tie diameter) is large.

https://ir.nctu.edu.tw:443/bitstream/11536/27503/1/000185407600004.pdf

Nonlinear analysis of axially loaded concrete-filled tube columns with confinement effect

Effects of the combination of axial and shear loading on the behaviour of headed stud steel anchors

Behaviour of composite beam-column flush end-plate connections subjected to low-probability, high-consequence loading

Composite sections are being increasingly used as columns in multistory buildings. These sections provide considerable economy as they eliminate plywood formwork and allow large percentages of steel to be utilized in their application. The initial local buckling load of these sections is enhanced by the presence of the concrete infill and this allows very slender steel plates to be used in their fabrication. This paper investigates the local and postlocal buckling behavior of welded sections as box or wide flange I-sections. An extensive set of experiments was conducted on both hollow and concrete-filled steel box sections. Furthermore, a detailed study of flange outstands with and without concrete infill is considered in this paper. A numerical model based on the finite strip method is used to determine the initial local buckling stress incorporating residual stresses, and this is shown to agree well with the experiments. Finally, an effective width model developed elsewhere and presented in existing international codes is augmented and calibrated with the test results. This method is found to be useful in determining the axial compressive strength of these cross sections.

Local and Postlocal Buckling of Fabricated Steel and Composite Cross Sections

Behaviour of headed stud shear connectors for composite steel-concrete beams at elevated temperatures

A new self-centering beam-to-column connection is proposed. The connection uses posttensioned high-strength steel bars to provide self-centering capability and carefully designed energy-dissipation (ED) elements that consist of steel cylindrical pins with an hourglass shape. The proposed ED elements have superior ED and fracture capacity, and are placed between the upper and the bottom flanges of the beam such that they do not interfere with the composite slab. A simplified performance-based procedure was used to design the proposed connection. The connection performance was experimentally validated under quasi-static cyclic loading. The specimens were imposed to drift levels beyond the expected design ones to identify all possible failure modes. The experimental results show that the proposed connection eliminates residual drifts and beam damage for drifts lower than or equal to 6%. A simplified analytical procedure using plastic analysis and simple mechanics was found to accurately predict the connection behavior. Repeated tests on a connection specimen were conducted, along with replacing damaged ED elements. These tests showed that the proposed ED elements can be easily replaced without welding or bolting, and hence the proposed connection can be repaired with minimal disturbance to building use or occupation in the aftermath of a major earthquake.

Brian Uy

Papers

Effects of the combination of axial and shear loading on the behaviour of headed stud steel anchors

Behaviour of composite beam-column flush end-plate connections subjected to low-probability, high-consequence loading

Local and Postlocal Buckling of Fabricated Steel and Composite Cross Sections

Behaviour of headed stud shear connectors for composite steel-concrete beams at elevated temperatures

Large-Scale Experimental Validation of Steel Posttensioned Connections with Web Hourglass Pins