Dongbei waterway in the lower reach of Yangtze River includes three waterways: Hukou waterway, Heng waterway and Zhi waterway. For a long time the documents about the evolution of measured data in based mainly on topographic information and it is insufficient materials actually measured about the character of water flow. In order to make up the incomplete measured documents, it is intended herein to make calculation of character of water flow by means of mathematic model. The results show that, there are overflows to various extents for the side shoal at Sizhouwei under different discharge. It appears crossing troughs in the left to the side shoal at Sizhouwei. The bigger flow velocity of lower shoal and its left rim is possible for being washed out.
The kinetics of the martensite decomposition in TC21 alloy under isothermal conditions has been studied using dilatometry technique. The typical morphologies of decomposition products were also directly observed. At 500°C and 550°C, the mechanism of martensite decomposition occur by, at temperature between 600°C and 750°C, the martensite decompose by . up 800°C, the martensite directly transform to α and β phase. Time–temperature–transformation diagram with iso-lines tracing the amount of the martensite decomposition have been established.
Dongbei waterway in the lower reach of Yangtze River includes three waterway: Hukou waterway, Heng waterway and Zhi waterway. The evolvement trend based on the measured data show that the right branch of Xiasanhaozhou is developed and the shallow shoal at the head of Xiasanhaozhou is scoured along with the right branch be rushed and ratio of diversion flow increase which have negative effect on transition shoals. In order to analysis the effect of evolvement trend on the channel conditions of transition shoals, this paper adopt cognitive calculation on water flow of Dongbei waterway using mathematic model. The results show that, the development of right branch of Xiasanhaozhou and the shallow shoal cutting at the head of Xiasanhaozhou decrease velocity of transition sections, decrease the diversion flow of the left branch of Xiasanhaozhou, and increase the diversion flow of the head of Xiasanhaozhou which have negative effect on transition shoals.
The main bridge of Yunshi Hanjiang River Bridge is a prestressed concrete extradosed bridge with two pylons, a single cable plane and with span arrangement (128+238+128) m. The main girder of the bridge is the concrete continuous triple-cell single box girder of long cantilevers and variable sections, the box girder is 26.5m wide. The cantilever of girder is 5.75m wide as to reduce the self-weight of main girder. In the design, the software Dr.Bridge was used to establish the finite element model for the box girder and to carry out the global calculation of the girder lateral calculation. The software ANSYS was used as well to establish the finite element model for the segments of the main girder and to carry out the analysis of the local stress of the girder. The results of the calculation and analysis indicate that the global structure of the bridge is safe and reliable and the structure can meet the requirements for highway vehicle riding safety and comfort. No significant local stress concentration appears in the main girder, the stress amplitude values of the stay cables are within 30Mpa, and the structure can meet the requirements for durability in the process of service of the bridge. With long cantilever design greatly reduce the self-weight of main girder and saving cost, at the same time make the bridge look lighter and beautiful. The results of the analysis provide a reference for analysis on the shear lag effect and lateral calculation of the concrete continuous triple-cell single box girder of long cantilevers and variable sections.
It is described herein the general rule complied with by different forms of rivers by calculation of evolution trend of selected typical reaches of Ouchikou, Wakouzi and Yaojian which are appeared in the middle of Yangtze River, representing respectively the straight branch, minor bending branch and bending branch. The evolution for reaches of straight branches are mainly characterized with moving backward of side shoal by washout, increased swing of main flow, becoming shallow of riverbed and displacement of navigation trough. For minor bending branches, they generally have unstable water courses, frequently swinging thalweg, washout on head part and left and right rims of heart shoal and extended downward of deposit at the end. Because of reduced sand content, main courses and branches are in the trend of washout. As for bending branches, it is generally stable because of shore protection projects and the navigation condition is better than other type of river reaches unless there is sharp cutting of protruding side shoals.
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