Applied Mechanics and Materials Vols. 341-342

Abstract: With the comprehensive construction of the smart grid, the smart grid operation control and interactive service system will be initially formed. The smart terminal of smart grid are smart meters, and they produce a large number of various data all the time. That how to most effectively manage these massive data storage is an important research point for improving the intelligence service. This paper studies the smart meter massive data storage management based on cloud computing platform. The Hadoop distributed computing platform for smart meter massive data management is reliable, efficient, scalable storage.

Abstract: The urban renewal is not a simple reconstruction by demolition for the urban material substances, but its a kind of the artificial behavior to promote solution of various problems which can affect and hinder the urban development and obtain sustainable development. The renewal project planning of the industrial cities is a continuous, dynamic, long-term development process, in this process, emphasizing the application of the optimization of the forward-looking, dynamic and comprehensive renewal planning system has an important guiding significance on the sustainable development of the cities.

Abstract: Based on the nonlinear finite element method, the basic characters of widened road engineering are studied. It is found that the maximal lateral displacement of embankment achieved in the widened part, especially happened at the intersection between original part and widened part, which increased with the width of widened part increased. The maximal vertical settlement of embankment increased with width of widened part increased. The width of widened part has little influence on the failure surface and stability of embankment.

Abstract: Various new type scaffolds have been introduced and developed in China. They are novel in structure and economic in material, but their security and reliability can not be ignored. This paper introduced a new chained formwork support frame with nine upright tubes and many cross-braced connections. Firstly, the load test of the support frame was performed in order to observe the failure process and to determine the ultimate bearing capacity. Then, the strength and stability of both single upright tube and a cross-braced rod were checked according to the existing specifications on scaffolds. Finally, a finite element software ANSYS was used to establish a solid model for the support frame. The structural stability was analyzed and the ultimate bearing capacity was calculated. The comparison between the computational and experiment results was carried out. The results show that the ultimate bearing capacity of the new chained formwork support frame is controlled by the structural stability.

Abstract: The distribution of surface pressure of columns in concrete bridge with the effect of wind load has been simulated by Ansys software. Carbonation model of concrete in windy environment has been established by analyzing the relationship between the wind pressure, carbonization time and carbonation depth. Furthermore, by Taking air pressure of concrete surface into the carbonation model, there is a good consistency between the test value and the measured value of the actual place. At last, the design method of the durability of concrete structures under wind loads, which is based on concrete durability limit state, has been putted forward to determine the expression of the breakdown coefficient.

Abstract: In order to investigate the effect of fiber reinforced light-weight aggregate concrete on flexural tension properties, five groups of steel fiber reinforced light-weight aggregate concrete (SFLWAC) specimens with different steel fiber volumes including 0.5%,1.0%,1.5%,2.0%,2.5% and another five groups of plastics-steel fiber reinforced light-weight aggregate concrete (PSFLWAC) specimens with different plastics-steel fiber volumes including 0.5%,0.7%,0.9%,1.1%,1.3% were tested. The test results show that fiber can greatly improve ductility, and there are good interfacial bonding properties between fiber and light-weight aggregate concrete. The test results also show that it is not obvious to the upgrade of the flexural strength of light-weight aggregate concrete of LC30 with plastics-steel fiber. But the addition of steel fiber can gradually improve the breaking strength owing to the increase of steel fiber volumes.

Abstract: Solar power generation is one of the important directions of development, however, Trough solar is the world's most mature and achieve commercial operation of power generation technology. The design of the key components of the entire power generation collector is particularly important. Using optimization design method of key components of the collector for solar power generation equipment mechanics analysis reduces the production cost. Related products for the future of the design, manufacture provides some reference theory basis.

Abstract: Determining the freezing reinforcement required range and reinforcement method, acquiring the development and distribution pattens of frozen soil wall temperature field are the key issues needed to be addressed when using cup-shaped horizontal freezing method for the soil reinforcement of shield tunnel ends. Based on the shield launching project of the west side of Yixianqiao station in Nanjing subway line 2 and the finite element numerical analysis software, the development and distribution patterns of the cup-shaped frozen soil wall reinforcement were studied. The numerical simulation showed that, after freezing for 30 days, the x = -1 section temperature field evenly distributed around the center tube. And the freezing temperatures within the outer tubes were usually below-20°C. The temperature field circled around the center tube and the temperature gradually increased from the inside to the outside to 0°C within the range of about 1 m outside the outer tubes. The freezing temperatures within the range of 2 m thickness of the cup-bottom in the y= 0 section were usually below-10°C and the temperatures changed from inner to outer significantly until rising to 0 °C at the freezing pipe ends of the cup-bottom. Freeze wall formed firstly in the outer tubes, then the intermediate tubes, and lastly the outer tubes. And the freeze wall closure time that closed cup-shaped frozen soil wall formed was 15 days in this designed freezing method.

Abstract: Silty clay’s disturbed soil samples of were measured to ascertain the correlations between thermal conductivity and dry density or water content in the freezing and thawing conditions and provide a certain reference for soil’s thermal conductivity measurement of underground project in seasonal frozen area in future. The relationship between another variable and thermal conductivity was inquired into through fixing one variable in the test process. Through the test data analysis, the conclusion can be drawn as followed. Keeping dry density unchanged, silty clay’s thermal conductivities in freezing and thawing increase with water contents. When dry densities are different, the growth trends of thermal conductivities are slightly different. In the same moisture content, the relation between dry density and thermal conductivity appears as positive correlation.

Abstract: According to the theories of explosive mechanics and rock fracture dynamics mechanics, carries on the theoretical analysis to the complex slotted seam cartridge, obtains that the complex slotted seam cartridge has the better directional fracture effect. Through the similar simulation experimental study, using the microscopic fracture detection and the macroscopic observation method, a comprehensive analysis of the complex slotted seam cartridge and the conventional slotted seam cartridge's blasting effect, the analysis also indicated that the complex slotted seam cartridge has the better directional fracture effect and the higher energy utilization, and is smaller to the surrounding rock damage.