LINE SHAPE MONITORING OF LONGSPAN CONCRETE-FILLED STEEL TUBE ARCHES BASED ON THREE-DIMENSIONAL LASER SCANNING

2021 ◽  
Vol 36 (10) ◽  
Author(s):  
Mingshu Sun ◽  
Anqi Xu ◽  
Jian Liu
Keyword(s):  
Line Shape ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Steel Tube ◽  
Concrete Filled Steel Tube ◽  
Shape Monitoring

Temperature Field Analysis of Circular Concrete Filled Steel Tube Reinforced Concrete Column under Fire

2014 ◽  
Vol 1015 ◽  
pp. 219-222 ◽  
Author(s):  
Jian Sheng Dong ◽  
Qing Xin Ren ◽  
Lian Guang Jia
Keyword(s):  
Reinforced Concrete ◽  
Three Dimensional ◽  
Steel Tube ◽  
Field Analysis ◽  
Concrete Column ◽  
Analysis Model ◽  
Structural Behaviour ◽  
Reinforced Concrete Column ◽  
Element Analysis ◽  
Concrete Filled Steel Tube

A three-dimensional finite element analysis model was developed using ABAQUS to simulate the temperature distributions of circular concrete filled steel tube reinforced concrete column in this paper. The influence of main parameters on the temperature distribution, such as heating time, section diameter, and steel tube diameter, was analyzed. This provides valuable information about structural fire resistance and structural behaviour of concrete filled steel tube reinforced concrete column structure under fire.

scholarly journals Construction Simulation Analysis of 60m-span Concrete Filled Steel Tube arch bridge

2018 ◽  
Vol 38 ◽  
pp. 03056
Author(s):  
Jing Xian Shi ◽  
Qing Hua Ding
Keyword(s):  
Simulation Analysis ◽  
Three Dimensional ◽  
Internal Force ◽  
Steel Tube ◽  
Construction Simulation ◽  
Construction Process ◽  
Arch Bridge ◽  
Concrete Filled Steel Tube ◽  
Three Dimensional Finite Element ◽  
Main Arch

The construction process of the CFST arch bridge is complicated. The construction process not only affects the structural stress in the installation, but also determines the form a bridge and internal force of the bridge. In this paper, a 60m span concrete filled steel tube tied arch bridge is taken as the background, and a three-dimensional finite element simulation model is established by using the MIDAS/Civil bridge structure analysis software. The elevation of the main arch ring, the beam stress, the forces in hanger rods and the modal frequency of the main arch during the construction stage are calculated, and the construction process is simulated and analyzed. Effectively and reasonably guide the construction and ensure that the line and force conditions of the completed bridge meet the design requirements and provides a reliable technical guarantee for the safe construction of the bridge.

Reliability Analysis of Circular Concrete-Filled Steel Tube with Material and Geometrical Nonlinearity

2012 ◽  
Vol 446-449 ◽  
pp. 550-555
Author(s):  
Teng Fei Xu ◽  
Tian Yu Xiang ◽  
Yu Lin Zhan ◽  
Ren Da Zhao
Keyword(s):  
Reliability Analysis ◽  
Geometrical Nonlinearity ◽  
Three Dimensional ◽  
Steel Tube ◽  
Material Strength ◽  
Rational Analysis ◽  
Element Analysis ◽  
Concrete Filled Steel Tube ◽  
Analysis And Design ◽  
Reliability Method

Most of the previous researches on the concrete-filled steel tube are restricted to deterministic approach. To give a clearer insight about random properties of circular concrete-filled steel tube, reliability analysis is carried in the present study. Material and geometrical nonlinear analysis of a circular concrete-filled steel tube is performed with a three-dimensional degenerated beam element, which can efficiently obtain the structural nonlinear responses. Through the combination of first order reliability method and nonlinear finite element analysis, the reliability about ultimate resistance capacity of the concrete-filled steel tube is investigated. The influences of parameters such as material strength, slenderness, initial geometrical imperfection, and etc. on reliability of circular concrete-filled steel tube column are studied. Some conclusions obtained from reliability analysis may be beneficial for rational analysis and design of the concrete-filled steel tube in practical engineer structures.

Vertical Dynamic Response of a Concrete Filled Steel Tube due to Transient Impact Load: Analytical Solution

2016 ◽  
Vol 16 (01) ◽  
pp. 1640014 ◽  
Author(s):  
Xuanming Ding ◽  
Yuming Fan ◽  
Ping Li ◽  
Gangqiang Kong
Keyword(s):  
Analytical Solution ◽  
Dynamic Response ◽  
Wave Equations ◽  
Impact Load ◽  
Separation Of Variables ◽  
Three Dimensional ◽  
Vertical Displacement ◽  
Steel Tube ◽  
Concrete Filled Steel Tube ◽  
The Impact

This paper presents an analytical solution of vertical dynamic response of a concrete-filled steel tube (CFST) due to transient impact loading. Both the concrete and steel are modeled by linear elastic material. The impact load is simulated by a semisinusoidal impulse. Three-dimensional (3D) wave equations those considering the vertical displacement are established. By combining the initial and boundary conditions, the frequency-domain analytical solution of displacement is deduced by Laplace transformation and separation of variables methods. The time-domain dynamic response is then obtained by numerical inverse Fourier transformation (IFT). Numerical examples are presented to verify the validity of the analytical solution developed in this study. The results indicate that the analytical solution proposed in this study shows good consistence with the existing solutions.

Study on Macroseismic Response of an Special-Shape Concrete-Filled-Steel-Tube Arch Bridge

2014 ◽  
Vol 711 ◽  
pp. 454-460 ◽  
Author(s):  
Guo Ping Huang
Keyword(s):  
Seismic Response ◽  
Seismic Waves ◽  
Three Dimensional ◽  
Steel Tube ◽  
Finite Element Models ◽  
Special Shape ◽  
Arch Bridge ◽  
Concrete Filled Steel Tube ◽  
Elastic Plastic ◽  
Processing Modes

It is extremely complex for the seismic response of special-shape Concrete-filled-steel-tube arch bridge under severe earthquake, mainly in: the structure may enter elastic-plastic working state and nonlinear border, etc., with regards to this, the elastic-plastic beams unit of concrete-filled-steel-tube is introduced, using different boundary processing modes and establishing three different Midas finite element models. According to the second-level requirements of seismic probability level, regarding the artificial seismic waves as seismic input wave, it is carried out the three-dimensional seismic response of arch bridge. The results is showed that it have not yet entered elastic-plastic work scope for structure under E2 action of earthquake and the special-shape concrete-filled-steel-tube arch bridge is with the features of light deadweight and good seismic behavior.

Shear Strength of Connections between Concrete Filled Steel Tubes and Beams

2013 ◽  
Vol 351-352 ◽  
pp. 75-79 ◽  
Author(s):  
Li Jian
Keyword(s):  
Finite Element ◽  
Shear Strength ◽  
Three Dimensional ◽  
Element Model ◽  
Steel Tube ◽  
Vertical Shear ◽  
Steel Pipe ◽  
Tube Steel ◽  
Element Analysis ◽  
Concrete Filled Steel Tube

Departure from the stress state of the steel pipe concrete dye column node, axial force, steel pipe column end moments and stained end vertical shear strength Shear strength concrete filled steel tube the formula, using the finite element analysis software ANSYS to establish a three-dimensional nonlinear finite element model, comparing the results calculated by the finite element calculations and formulas seen, the model is applied to the concrete filled steel tube - steel beam finite element nodes analysis.

Laser Scanning Confocal Microscopy and Three-Dimesnsional Reconstruction of the Mitotic Spindles of Unequally Dividing Embryonic Cells

1990 ◽  
Vol 48 (3) ◽  
pp. 166-167
Author(s):  
J. Holy ◽  
G. Schatten
Keyword(s):  
Confocal Microscopy ◽  
Mitotic Spindle ◽  
Laser Scanning ◽  
Three Dimensional ◽  
Laser Scanning Confocal Microscopy ◽  
Two Dimensions ◽  
Embryonic Cells ◽  
Mitotic Spindles ◽  
Cleavage Division ◽  
Scanning Confocal Microscopy

One of the classic limitations of light microscopy has been the fact that three dimensional biological events could only be visualized in two dimensions. Recently, this shortcoming has been overcome by combining the technologies of laser scanning confocal microscopy (LSCM) and computer processing of microscopical data by volume rendering methods. We have employed these techniques to examine morphogenetic events characterizing early development of sea urchin embryos. Specifically, the fourth cleavage division was examined because it is at this point that the first morphological signs of cell differentiation appear, manifested in the production of macromeres and micromeres by unequally dividing vegetal blastomeres.The mitotic spindle within vegetal blastomeres undergoing unequal cleavage are highly polarized and develop specialized, flattened asters toward the micromere pole. In order to reconstruct the three-dimensional features of these spindles, both isolated spindles and intact, extracted embryos were fluorescently labeled with antibodies directed against either centrosomes or tubulin.

Automated 3-D cell population analysis in thick tissue sections using laser-scanning confocal-microscopy data

1993 ◽  
Vol 51 ◽  
pp. 562-563
Author(s):  
Hakan Ancin
Keyword(s):  
Laser Scanning ◽  
Population Analysis ◽  
Three Dimensional ◽  
Large Data ◽  
Laser Scanning Confocal Microscopy ◽  
Tissue Slices ◽  
Scanning Confocal Microscopy ◽  
Tissue Sections ◽  
Spatially Adaptive ◽  
Microscopy Data

This paper presents methods for performing detailed quantitative automated three dimensional (3-D) analysis of cell populations in thick tissue sections while preserving the relative 3-D locations of cells. Specifically, the method disambiguates overlapping clusters of cells, and accurately measures the volume, 3-D location, and shape parameters for each cell. Finally, the entire population of cells is analyzed to detect patterns and groupings with respect to various combinations of cell properties. All of the above is accomplished with zero subjective bias.In this method, a laser-scanning confocal light microscope (LSCM) is used to collect optical sections through the entire thickness (100 - 500μm) of fluorescently-labelled tissue slices. The acquired stack of optical slices is first subjected to axial deblurring using the expectation maximization (EM) algorithm. The resulting isotropic 3-D image is segmented using a spatially-adaptive Poisson based image segmentation algorithm with region-dependent smoothing parameters. Extracting the voxels that were labelled as "foreground" into an active voxel data structure results in a large data reduction.

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