Numerical simulation model was established with FLAC3D to calculate the bearing capacity and the settlement of composite foundation with different pile-soil shear modulus. Then the rules of the effect of pile-soil shear modulus upon mixed pile composite foundation have been obtained. The results show that there is a great relationship between the pile-soil shear modulus and the bearing capacity of mixed pile composite foundation. Along with the increase of pile-soil shear modulus, the bearing capacity increase. Also, this paper suggest that the right value of pile-soil shear modulus of mixed pile composite foundation solidified by HEC or HAS consolidator dosing 12%, which can be used for the design of mixed pile composite foundation.
As an example, the design and construction technology of the anti-ship collision suspended steel cofferdam in Shanghai Changjiang River Bridge has been discussed. Design analysis shows that: by using the anti-ship collision suspended steel cofferdam the bridge pier can be protected and adopted lots of collision energy. At the same time, the collision injury degree of the vessel could be reduced. By using the finite element method, the deformation and strain state under the stage of construction and floating-transportation had been analyzed. Considering both the anti-ship collision and the construction, the anti-ship collision suspended steel cofferdam has been designed. In construction stage, the following methods had been developed: the integrally manufacturing method in factory, launching method to river in slideway, fioating-transportion method to the pier position in long distance and set-to-place method by synchronous lifting of two floating cranes. These results listed in this paper are beneficial to the design and construction of the anti-ship collision suspended steel cofferdam.
To decrease the interdiffusion, CrON interlayer as a diffusion barrier was introduced into the interface of NiCrAlY overlayer and DSM11 substrate. The microstructure and effect of the diffusion barrier were investigated. It was found that the as-deposited CrON diffusion barrier was comprised of Cr2O3and CrN. During thermal treatment (including vacuum heat treatment and thermal exposure), the diffusion barrier was first transformed to Al2O3and Cr2N, then to Al2O3dominant interlayer, and porous mixed-oxides including TiO2and NiCr2O4spinels were detected in the interdiffusion zone between the diffusion barrier and the substrate. The presence of α- Al2O3in the diffusion barrier was the main reason for suppressing the interdiffusion. The interfacial reaction mechanism in the diffusion barrier was discussed by elemental diffusion and chemical reaction thermodynamics.
A novel zero-dimensional dinuclear zinc complex, di-μ-acetato-1:2κ4
O:O′-(μ-2-acetyl-6-{[(Z)-2-bromo-3-oxoprop-1-en-1-yl]azanidyl}phenolato-1κ2
O
1,O
2:2κ3
O
1,N,O
6)(N,N-dimethylacetamide-1κO)dizinc(II), [Zn2(C11H8BrNO3)(CH3COO)2(C4H9NO)] or [Zn2(L)(CH3COO)2(DMA)], 1, was synthesized using (Z)-3-[(3-acetyl-2-hydroxyphenyl)amino]-2-bromoprop-2-enal (H2
L), which was synthesized from 1-(3-amino-2-hydroxyphenyl)ethanone and 2-bromomalonaldehyde. H2
L and 1 were characterized by single-crystal X-ray diffraction, FT–IR spectroscopy and elemental analysis. Theoretical calculations of the bond orders and excited state of H2
L confirmed that there is extensive electron delocalization in the H2
L molecules. Single-crystal X-ray diffraction shows that the two Zn atoms are pentacoordinated in distorted trigonal bipyramidal configurations in the crystals of 1. The thermogravimetric analysis of 1 shows that the main frame of the complex remains stable to about 190 °C. Powder X-ray diffraction (PXRD) analysis shows that 1 possesses high purity and acid and alkali resistance. The intermolecular interactions of H2
L and 1 were analyzed using Hirshfeld surface analysis and the results indicate that the H...H and O...H interactions of H2
L and 1 play a considerable role in stabilizing the self-assembly process.
Chongqing Chaotianmen Bridge is by far the world's largest three-span continuous half-through double-layer steel truss tied arch bridge. Risk evaluation and risk analysis are made to the bridge during construction period. At the same time, various measures are taken to avoid construction risks and accidents. The principal line of risk controls is clear with reasonable control measures. Chongqing Chaotianmen Bridge was completed and available for traffic on April 29, 2009, its various technical and quality indicators are in accordance with design and specifications.
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