Theoretical Analysis and Model Experimental Research on Single-Layer Hyperbolic Paraboloid Latticed Shell

2011 ◽  
Vol 105-107 ◽  
pp. 892-896
Author(s):  
Peng Deng ◽  
Lai Wang ◽  
Na Han
Keyword(s):  
Mechanical Properties ◽  
Theoretical Analysis ◽  
Experimental Research ◽  
Axial Force ◽  
Single Layer ◽  
Structure Design ◽  
Scale Model ◽  
Local Instability ◽  
Hyperbolic Paraboloid ◽  
Design Load

Single-layer hyperbolic paraboloidal latticed shell dome is adopted in the gymnasium of China University of Petroleum. And the center part of the dome employs crossed web bars in order to increase stiffness of the structure. The 1:12 scale model has been made according to the construction drawings, and the mechanical properties of the model are studied under self-weight load and design load. The regularity of the members' axial force and joints' displacements are obtained. And the results show that the deflection of dome under design load conforms to the requirement of specifications, which verified the correctness of the structure design. It is found that there is no overall instability and local instability, and the behavior of the structure is almost linear.

Mechanical properties analysis of steel– concrete–steel composite beam

2015 ◽  
Vol 19 (5) ◽  
pp. 525-543 ◽  
Author(s):  
Guang P Zou ◽  
Pei X Xia ◽  
Xin H Shen ◽  
Peng Wang
Keyword(s):  
Mechanical Properties ◽  
Theoretical Analysis ◽  
Sectional Curvature ◽  
Axial Force ◽  
Composite Beam ◽  
Composite Beams ◽  
Interfacial Slip ◽  
Concentrated Load ◽  
Steel Composite ◽  
Interface Slip

The interface slip will appear between the steel plates and concrete while the steel–concrete–steel composite beam under loading. It may influence the mechanical properties of the composite beam. In this paper, through theoretical analysis of the steel–concrete–steel composite beam, differential equation of interface slip is established at first. By simulating the real boundary, the formulas of interface slip are calculated under uniform and arbitrary concentrated load. Then, the axial force, the sectional curvature, and deformation of composite beams are obtained. In order to validate the reliability of the theoretical analysis, the deformation of 18 samples is calculated by using the deformation formulas of steel–concrete–steel composite beam. The results are in good agreement with the experimental consequences. Through an example, the mechanical properties of composite beams (axial force, sectional curvature, and deformation) are analyzed under interfacial slip. With the decreasing of interfacial slip, axial force of upper plate increases, and sectional curvature and deflection decrease. For lower steel plate, the interfacial slip has smaller effect.

Experimental Research on Mechanical Properties of Fundamental Frame Units in Multi-Ribbed Composite Wallboard

2012 ◽  
Vol 166-169 ◽  
pp. 3174-3179
Author(s):  
Ya Feng Yue ◽  
Dong Zhao
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
Scale Model ◽  
Infilled Frame ◽  
Section Size

The fundamental frame units were taken from the multi-ribbed composite wallboard. 1/2 scale model specimens including bare frame (FD Series) and infilled frame (IFD Series) were loaded in the diagonal direction. By changing the section size of a frame beam and column, the mechanical properties of multi-frames under vertical and horizontal loads were studied. Through comparing and analyses, contributions and interaction between frame and infilled block were investigated. The results show that the frame section stiffness influences the mechanical properties remarkably and the interaction between frame and infill is significant.

Experimental Research on the Latticed Intersected Cylindrical Shell Structure

2014 ◽  
Vol 578-579 ◽  
pp. 378-383
Author(s):  
Ming Liang Zhu ◽  
Li Huang ◽  
Chao Li
Keyword(s):  
Mechanical Properties ◽  
Cylindrical Shell ◽  
Theoretical Analysis ◽  
Spatial Structure ◽  
Experimental Research ◽  
Model Experiment ◽  
Structural Model ◽  
Mechanical Performance ◽  
New Type ◽  
Internal Forces

The Latticed Intersected Cylindrical Shell (LICS) is a new type of spatial structure. In order to investigate the mechanical properties of LICS, an octagonal structural model, valley style, was designed and constructed. The model experiment under full-span loading was carried out. By comparing the experimental results with theoretical analysis, the LICS is proved to exhibit well mechanical performance. Valley members get high stresses, especially the members near bearings. It is proved that internal forces transmit to the bearings through the valley members.

A New Widening Method of Reinforced Concrete Box Girder and its Experimental Research

2010 ◽  
Vol 163-167 ◽  
pp. 3724-3729
Author(s):  
Qian Wang ◽  
Lei Shi ◽  
Zhe Zhang
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Experimental Research ◽  
Model Test ◽  
Full Scale ◽  
Scale Model ◽  
Box Girder ◽  
Concrete Box Girder

This paper introduces a new box girder widening method- Steel cantilever widening concrete box girder method without piers (SCWCGM for short). Without additional piers, SCWCGM can still meet the need of widening range, which is an effective widening method for urban bridges. In this paper, the widening conception and the structure style of SCWCGM is detailed. In order to study the mechanical properties of this method, the full-scale model test was conducted. The results show that, the SCWCGM is reasonable and feasible.

Cracking at the fold in double layer coated paper: the influence of latex and starch composition

TAPPI Journal ◽  
2019 ◽  
Vol 18 (2) ◽  
pp. 93-99
Author(s):  
SEYYED MOHAMMAD HASHEMI NAJAFI ◽  
DOUGLAS BOUSFIELD, ◽  
MEHDI TAJVIDI
Keyword(s):  
Mechanical Properties ◽  
Double Layer ◽  
Starch Content ◽  
Single Layer ◽  
Double Layers ◽  
Coated Paper ◽  
Coated Papers ◽  
Coating Layers ◽  
Scanned Images ◽  
Packaging Paper

Cracking at the fold of publication and packaging paper grades is a serious problem that can lead to rejection of product. Recent work has revealed some basic mechanisms and the influence of various parameters on the extent of crack area, but no studies are reported using coating layers with known mechanical properties, especially for double-coated systems. In this study, coating layers with different and known mechanical properties were used to characterize crack formation during folding. The coating formulations were applied on two different basis weight papers, and the coated papers were folded. The binder systems in these formulations were different combinations of a styrene-butadiene latex and mixtures of latex and starch for two different pigment volume concentrations (PVC). Both types of papers were coated with single and double layers. The folded area was scanned with a high-resolution scanner while the samples were kept at their folded angle. The scanned images were analyzed within a constant area. The crack areas were reported for different types of papers, binder system and PVC values. As PVC, starch content, and paper basis weight increased, the crack area increased. Double layer coated papers with high PVC and high starch content at the top layer had more cracks in comparison with a single layer coated paper, but when the PVC of the top layer was low, cracking area decreased. No measurable cracking was observed when the top layer was formulated with a 100% latex layer.

Ab Initio Calculation of Mechanical Properties of Stacking Fault in 3C-SiC: Effect of Stress and Doping

2012 ◽  
Vol 717-720 ◽  
pp. 415-418
Author(s):  
Yoshitaka Umeno ◽  
Kuniaki Yagi ◽  
Hiroyuki Nagasawa
Keyword(s):  
Mechanical Properties ◽  
Ab Initio ◽  
Density Functional ◽  
Stacking Faults ◽  
Single Layer ◽  
Local Strain ◽  
Density Functional Theory Calculations ◽  
Stacking Fault ◽  
Functional Theory ◽  
N Doping

We carry out ab initio density functional theory calculations to investigate the fundamental mechanical properties of stacking faults in 3C-SiC, including the effect of stress and doping atoms (substitution of C by N or Si). Stress induced by stacking fault (SF) formation is quantitatively evaluated. Extrinsic SFs containing double and triple SiC layers are found to be slightly more stable than the single-layer extrinsic SF, supporting experimental observation. Effect of tensile or compressive stress on SF energies is found to be marginal. Neglecting the effect of local strain induced by doping, N doping around an SF obviously increase the SF formation energy, while SFs seem to be easily formed in Si-rich SiC.

scholarly journals Analysis of Different Complex Multilayer PACVD Coatings on Nanostructured WC-Co Cemented Carbide

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 823
Author(s):  
Danko Ćorić ◽  
Mateja Šnajdar Musa ◽  
Matija Sakoman ◽  
Željko Alar
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Base Material ◽  
Single Layer ◽  
Production Costs ◽  
Structural Defects ◽  
Cemented Carbides ◽  
Material System ◽  
Tin Coating ◽  
Ticn Coating

The development of cemented carbides nowadays is aimed at the application and sintering of ultrafine and nano-sized powders for the production of a variety of components where excellent mechanical properties and high wear resistance are required for use in high temperature and corrosive environment conditions. The most efficient way of increasing the tribological properties along with achieving high corrosion resistance is coating. Using surface processes (modification and/or coating), it is possible to form a surface layer/base material system with properties that can meet modern expectations with acceptable production costs. Three coating systems were developed on WC cemented carbides substrate with the addition of 10 wt.% Co using the plasma-assisted chemical vapor deposition (PACVD) method: single-layer TiN coating, harder multilayer gradient TiCN coating composed of TiN and TiCN layers, and the hardest multilayer TiBN coating composed of TiN and TiB2. Physical and mechanical properties of coated and uncoated samples were investigated by means of quantitative depth profile (QDP) analysis, nanoindentation, surface layer characterization (XRD analysis), and coating adhesion evaluation using the scratch test. The results confirm the possibility of obtaining nanostructured cemented carbides of homogeneous structure without structural defects such as eta phase or unbound carbon providing increase in hardness and fracture toughness. The lowest adhesion was detected for the single-layer TiN coating, while coatings with a complex architecture (TiCN, TiBN) showed improved adhesion.

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