Analysis of factors affecting stress and displacement of corrugated steel pipe culvert with large span and high depth

2021 ◽  
Author(s):  
Jie Li ◽  
Yongzhen Luo ◽  
Yu Qi ◽  
Jiangbo Xu ◽  
Xin Han ◽  
...  
Keyword(s):  
Steel Pipe ◽  
Factors Affecting ◽  
Large Span ◽  
High Depth

scholarly journals Research on Construction Monitoring of Large-Span Steel Pipe Truss Structure

2019 ◽  
Vol 09 (04) ◽  
pp. 255-267
Author(s):  
Kongliang Chen ◽  
Guoqing Yuan ◽  
Liankun Wang ◽  
Wenzhi Zhang ◽  
Xiaoke Wang
Keyword(s):  
Truss Structure ◽  
Steel Pipe ◽  
Construction Monitoring ◽  
Large Span

Design of a Steel Pipe Truss for a Hot Spring Spa

2013 ◽  
Vol 351-352 ◽  
pp. 195-198
Author(s):  
Shu Li Hou ◽  
Xiao Dong Yang ◽  
Ming Dong Wang
Keyword(s):  
Structural Analysis ◽  
Cross Section ◽  
Hot Spring ◽  
Structure Type ◽  
Steel Pipe ◽  
Large Span ◽  
Triangular Cross Section ◽  
Load Combination ◽  
Selection Of

Based on a real project, this paper presents the design of a space steel pipe truss with a triangular cross section upside down, in which it covers the selection of structure type, arrangement of the structure, loads and load combination, structural analysis as well as the detailing of some major joints. Thus it can serve as a reference for the design of similar large-span trusses.

scholarly journals Deformation Mechanism and Control Technology of Surrounding Rock in the Deep-Buried Large-Span Chamber

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-22
Author(s):  
Weijian Yu ◽  
Ke Li
Keyword(s):  
Field Investigation ◽  
Surrounding Rock ◽  
Engineering Practice ◽  
Underground Engineering ◽  
Metal Mesh ◽  
Severe Problem ◽  
Factors Affecting ◽  
Large Span ◽  
Anchor Cable ◽  
The Stability

The selection of the support scheme for deep-buried and large-span chambers has been a severe problem in underground engineering. To further study the mechanical mechanism of large deformation, based on the repair engineering of the chambers of Pingdingshan No.6 mine in China, the field investigation, laboratory test, numerical simulation, and theoretical analysis were studied. The surrounding rock of the central substation chamber (CSC) and the main pumping chamber (MPC) were classified according to the rock mass rating (RMR) classification method, and the main factors affecting the stability of the surrounding rock of the chambers were revealed. A prediction model of mechanical parameters of the surrounding rock was established based on the Hoek-Brown failure criterion. Additionally, the prediction results were used in FLAC3D to further analyze the failure of the original support scheme, and the feasibility of the restoration plan was proposed. Six key points of support technology for this kind of chamber were put forward. Comprehensive support and repair scheme, including “bolt, metal mesh, shotcrete, grouting, anchor cable, and combined anchor cable,” was put forward. The engineering practice indicated that the deformation rate was less than 0.7 mm/d, which was beneficial to the long-term stability of CSC and MPC. The implementation of this restoration project can provide a reference for other similar projects.

Emulational Calculation of Concrete Perfusion in Steel-Pipe Arch Rib of a Large-Span Bridge

2011 ◽  
Vol 71-78 ◽  
pp. 1488-1494
Author(s):  
Ying Hua Bai ◽  
Mu Yu Liu ◽  
Tian Qing Yu
Keyword(s):  
Steel Pipe ◽  
Structural Deformation ◽  
Structural Safety ◽  
Arch Bridge ◽  
Large Span ◽  
Commercial Package ◽  
Structural Responses ◽  
Bearing Force ◽  
Deformation Stress ◽  
Force Characteristics

The bridge is a half-through steel-pipe concrete arch bridge with uniform catenary. Based on sufficiently considering the principle of symmetrically loading rib concrete, the pouring process of the whole concrete is calculated with emulation with the aiding of commercial package MIDAS/Civil. By analyzing the structural deformation, stress and stability, the structural responses such as the structural distortion deformation, bearing-force characteristics and stability coefficients at different construction stages are computed in this study. The motivation of this investigation is to ensure the structural safety, and the structural security can also be discussed. The made observations indicate that the whole bridge has a high safety in either construction or operation and the achievement of research may provide reference for the similar arch bridge.

Research on Axial Compression Performance of Steel & Steel Pipe Reinforced Concrete Columns

2014 ◽  
Vol 584-586 ◽  
pp. 1313-1317
Author(s):  
Yun Yun Li ◽  
Bao Sheng Yang
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Strength ◽  
Concrete Columns ◽  
Steel Pipe ◽  
Shear Cracks ◽  
Working Mechanism ◽  
Factors Affecting ◽  
Composite Columns ◽  
Compression Performance

Through axial load bearing capacity test of eight steel & steel pipe reinforced concrete composite columns, the working mechanism, the ductility and the ultimate bearing capacity of the composite columns were studied, and the main factors affecting the performance of the composite columns are discussed, including concrete strength and the ferrule coefficient. The results show that the collaborative force of steel, steel pipe and concrete can effectively improve the bearing capacity of the columns, delay or inhibit the spread of oblique shear cracks in concrete and improve the ductility of the columns.

Progress In The Practical Application Of Automated Image Analysis To Tem Negatives

1977 ◽  
Vol 35 ◽  
pp. 214-217
Author(s):  
F. A. Heckman ◽  
E. Redman ◽  
J.E. Connolly
Keyword(s):  
Image Analysis ◽  
Image Quality ◽  
Exposure Time ◽  
Image Contrast ◽  
Automated Image Analysis ◽  
Practical Application ◽  
Factors Affecting ◽  
High Image Quality ◽  
Qualitative Evidence ◽  
Comprehensive Study

In our initial publication on this subject1) we reported results demonstrating that contrast is the most important factor in producing the high image quality required for reliable image analysis. We also listed the factors which enhance contrast in order of the experimentally determined magnitude of their effect. The two most powerful factors affecting image contrast attainable with sheet film are beam intensity and KV. At that time we had only qualitative evidence for the ranking of enhancing factors. Later we carried out the densitometric measurements which led to the results outlined below.Meaningful evaluations of the cause-effect relationships among the considerable number of variables in preparing EM negatives depend on doing things in a systematic way, varying only one parameter at a time. Unless otherwise noted, we adhered to the following procedure evolved during our comprehensive study:Philips EM-300; 30μ objective aperature; magnification 7000- 12000X, exposure time 1 second, anti-contamination device operating.

Factors affecting microstructural scale in liquid crystalline polymers

1990 ◽  
Vol 48 (4) ◽  
pp. 220-221
Author(s):  
Christine M. Dannels ◽  
Christopher Viney
Keyword(s):  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Factors Affecting ◽  
Crystalline Polymers ◽  
Thermal Expansion Coefficients ◽  
Low Thermal Expansion ◽  
Lower Viscosity ◽  
Fine Microstructure ◽  
Planar Orientation ◽  
Strength And Stiffness

Processing polymers from the liquid crystalline state offers several advantages compared to processing from conventional fluids. These include: better axial strength and stiffness in fibers, better planar orientation in films, lower viscosity during processing, low solidification shrinkage of injection moldings (thermotropic processing), and low thermal expansion coefficients. However, the compressive strength of the solid is disappointing. Previous efforts to improve this property have focussed on synthesizing stiffer molecules. The effect of microstructural scale has been overlooked, even though its relevance to the mechanical and physical properties of more traditional materials is well established. By analogy with the behavior of metals and ceramics, one would expect a fine microstructure (i..e. a high density of orientational defects) to be desirable.Also, because much microstructural detail in liquid crystalline polymers occurs on a scale close to the wavelength of light, light is scattered on passing through these materials.

A New Numerical Model for Electron-Probe Analysis at High Depth Resolution

1996 ◽  
Vol 54 ◽  
pp. 490-491
Author(s):  
P.-F. Staub ◽  
C. Bonnelle ◽  
F. Vergand ◽  
P. Jonnard
Keyword(s):  
Electron Probe ◽  
Surface Segregation ◽  
Depth Distribution ◽  
Computing Time ◽  
Depth Resolution ◽  
Physical Parameters ◽  
Electron Probe Analysis ◽  
Interface Phases ◽  
Excitation Conditions ◽  
High Depth

Characterizing dimensionally and chemically nanometric structures such as surface segregation or interface phases can be performed efficiently using electron probe (EP) techniques at very low excitation conditions, i.e. using small incident energies (0.5<E0<5 keV) and low incident overvoltages (1<U0<1.7). In such extreme conditions, classical analytical EP models are generally pushed to their validity limits in terms of accuracy and physical consistency, and Monte-Carlo simulations are not convenient solutions as routine tools, because of their cost in computing time. In this context, we have developed an intermediate procedure, called IntriX, in which the ionization depth distributions Φ(ρz) are numerically reconstructed by integration of basic macroscopic physical parameters describing the electron beam/matter interaction, all of them being available under pre-established analytical forms. IntriX’s procedure consists in dividing the ionization depth distribution into three separate contributions:

Factors affecting dentist participation in a state Medicaid program

1990 ◽  
Vol 54 (11) ◽  
pp. 638-643 ◽  
Author(s):  
PC Damiano ◽  
ER Brown ◽  
JD Johnson ◽  
JP Scheetz
Keyword(s):  
Medicaid Program ◽  
Factors Affecting
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