Papers by Keyword: Concrete-Filled Steel Tube (CFST)

Abstract: This paper reports a finite element analysis of the flexural behaviour of concrete-filled steel tubular members with elliptical section. A set of test data were used to verify the FE modeling. generally, good agreement was achieved. Typical curves of moment (M) versus deflection at mid-span (u_m), as well as stress distributions of steel tube and concrete of the composite members were compared and discussed. The results clearly show that the FE model is available for predicting the load-bearing capacities and the failure modes of the specimens.

Abstract: By means of eccentric compressive tests of Concrete-filled Steel Tubular Columns, to research the mechanical properties and failure modes of Concrete-filled Steel Tubular Columns without yield point. Research shows that, the failure modes of axial compressive Concrete-filled Steel Tubular Columns without yield point, as well as axial compressive short columns, have the same trend of oblique shear failure.

Abstract: Due to the restraint of steel tube concrete of concrete filled steel tubular components，three directions’ compression at the same time， the bearing capacity of concrete is obviously improved.As a result of the existence of steel pipe concrete，can effectively prevent the steel tube of local buckling ，com-plementary advantages and disadvantages of these two kinds of material ， the performance of the material is greatly improved. In this paper, the performance and characteristics of the composite material has carried on the detailed instructions，the ultimate bearing capacity of calculation principle has carried on the detailed analysis and research， the application of this new type of material are summarized.

Abstract: Monitoring and controlling of vertical construction for main arch ribs is most important for concrete-filled steel tube (CFST) arch bridges due to high risk. Controlling the difference of elevation between the two main arch ribs has direct influence on the mechanical behavior of lateral brace, towers and temporary hinges at arch abutments of main piers. Therefore, transverse synchronization control is the main priority in vertical rotating construction phase. Taking a half-through CFST arch bridge in Shijiazhuang City as an example, this paper make a study of transverse synchronization control of the two main arch ribs during vertical rotation. The finite element method (FEM) software-Midas is employed to simulate the main arch ribs in rotation construction phase, and maximum value of the difference of elevation between the two main arch ribs is obtained to offer reference and basis of vertical rotation construction of this bridge.

Abstract: Concrete filled steel tube (CFST) got a good application in actual project. In order to further the seismic performance of the CFST, experiment was carried on two 1/5 scale models, which included one CFST frame, one CFST truss. Based on the experimental study, load-carrying capacity, stiffness, ductility, hysteretic property, energy dissipation and failure phenomena of each model were analyzed. The study shows that the seismic performance of CFST truss has high bearing capacity, stiffness, energy dissipation capacity and good ductility.

Abstract: Shear wall with concrete filled steel tube columns and concealed trusses is a new kind of shear wall. In order to further the seismic performance of the new shear wall, experiment was carried on three 1/5 scale models, which included one traditional RC shear wall, one shear wall with concrete filled steel tube columns, one shear wall with concrete filled steel tube columns and concealed trusses. Based on the experimental study, load-carrying capacity and hysteretic property of each model were analyzed. The study show that the seismic performance of shear wall with concrete filled round steel tube columns and concealed steel trusses has high bearing capacity and good hysteretic property. Load carrying capacity calculation of shear wall with concrete filled steel tube columns and concealed steel trusses were carried out, the calculate results were in good agreement with the measured results.

Abstract: Further research on constitutive model of RPC (Reactive Powder Concrete) restrained by steel tube under axial compression is analyzed based on the research on concrete-filled steel tube and RPC-filled steel tube at home and abroad. Finite element analysis on RPC-filled steel tube stub columns under axial compression is conducted with ABAQUS to analyze the confinement index, core concrete strength and contact property on ultimate bearing capacity of RPC restrained by steel tube. As the confinement index and the core concrete strength increasing, the bearing capacity of RPC restrained by steel tube increases. The model with frictionless contact form has greater bearing capacity, but the ductility decreases.

Abstract: Concrete-filled steel tube, as a main bearing component, can be temporarily used as the building support of other components. In this paper, the key and difficult points in the construction of concrete-filled steel tube in underground civil engineering, how to use the key technologies in the construction process, and the quality control problems and development prospects are mainly introduced.

Abstract: CFST Arch Bridge under pressure mainly stability is one of the key factors restricting its development. Most of the arch of instability belongs to the second type of instability, and that the non-linear deformation of the structure is nonlinear state, the mechanical properties of the structure also change from elastic state into nonlinear state. In this paper, based on nonlinear and stability theory and using the finite element software ANSYS, parameters of affecting the main arch stability were studied. By analyzing the geometric and material nonlinear factors on the structural stability, the parameters of influence on the stability of the main arch were discussed, including width-span ratio, arch-rib inside inclination, rise-span ratio and arch-axis coefficient. The influence law of these parameters were summarized and will be used to guide the actual project.

Abstract: The post-fire axial compressive behavior of a set of self-stress lightweight aggregate concrete filled steel tubes (noted as SSLC-ST) after exposure to fire was studied. Effect of the fire temperatures of the specimens and some parameters on the axial compressive behavior of the specimens was especially discussed. The results show that the initial circumferential strain of surface of the steel tubes is much larger than the longitudinal strain of the steel tubes, and the specimens of SSLC-ST have higher post-fire axial compression bearing capacity and better plastic deformation. It was concluded that the local buckling and overall failure of the specimens take place in succession while the specimens are axially loaded, and there are a lot of slip lines with angle of 45^o on surface of the steel tubes.