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Liu C.-Y.,Hebei University of Technology | Zhao M.-X.,Hebei University of Technology | Liu Y.,China Aerospace Construction Group Co.
Advanced Materials Research | Year: 2013

The paper introduces the basic principles of vertical bearing capacity of the pile by usingstatic load test, establish the random site theory model of the bearing capacity of prestressed pipe pilefoundations calculation, calculates and statistics the try count ratio of vertical bearing capacity of 144prestressed pipe pile in Tianjin, work out calculation procedures of JC method, calculate reliabilityindex of vertical bearing capacity and analyze calculation results. In the last, we build a model usingthe finite element software, analysis the displacement of pile top under earthquake, evaluates thehorizontal bearing capacity of prestressed pipe pile. © (2013) Trans Tech Publications, Switzerland. Source


Sun X.-Y.,Harbin Institute of Technology | Hong C.-B.,Harbin Institute of Technology | Hong C.-B.,China Aerospace Construction Group Co. | Wu Y.,Harbin Institute of Technology | Fan F.,Harbin Institute of Technology
Gongcheng Lixue/Engineering Mechanics | Year: 2014

Based on the Euler-Euler method, the Mixture model is used to simulate the snow drifting around a building model by means of Computational Fluid Dynamics (CFD) software-FLUENT. During simulating, the Finite Volume Method and SIMPLE technology (Semi-Implicit Method for Pressure-Linked Equations) have been used. Saltation as well as suspension are taken into consideration. Firstly, the snow drifting around a snow fence is simulated. Through comparing different turbulence models, it can be proved that the k-kl-w model had good suitability and effectiveness. Then the snow drifting around a cube model is simulated. Compared with field measurements, the computational results of snow distribution are consistent with the real-scale field measurement that validates the numerical simulation effectiveness. Source


Wang J.,Xian University of Architecture and Technology | Zhang X.,China Aerospace Construction Group Co. | Wang T.,Xian University of Architecture and Technology
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2014

In arid and semi-arid regions, compacted loess is widely used in the construction of embankment, dam, excavation backfill and other projects. By rainfall infiltration and other factors, the moisture content of compacted loess will change frequently; so will the shear strength. Through direct shear tests, this paper studies the variation of shear strength parameters of compacted loess with water content and dry density. It gives the conclusion that under the same dry density conditions, compacted loess cohesion and internal friction angle increases with the decrease of water content; and the cohesion and internal friction angle have a quadratic parabolic relationship with water content. Further analysis has been calculated considering the impact of water content and dry density of compacted loess shear. ©, 2014, Science Press. All right reserved. Source


Ren F.,Xian Xincheng District Public Security Fire Brigade | Gao P.,China Aerospace Construction Group Co.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2014

In connection with the highly nonlinear and uncertainty of fire prediction of the city building, particle swarm optimization (PSO) is used to optimize the wavelet neural network (WNN), so as to establish the fire accident time series prediction model. The improved model is applied in the experimental simulation training and forecasting of the number that the fire broke out of a city building. The simulation application results show that the network output and expected values are in good agreement, and the convergence speed and generalization ability is much improved. So the model can be used to analyze and forecast the fire and thus provide a scientific basis and decision-making guidance for fire police, investment in facilities and the city's comprehensive disaster prevention and mitigation of fire safety management department. Source


Hu X.J.,China Aerospace Construction Group Co.
Advanced Materials Research | Year: 2014

Axiomatic Design (AD) provides designers with two axioms as criteria for design decision-making. The integration of AD with Theory of Inventive Problem Solving (TRIZ) is expected to effectively improve design activities. A computer-supported axiomatic design system integrating TRIZ methods was proposed to help designers obtain innovative solutions and make right decisions. Within the AD framework, TRIZ not only can be applied to adjust design parameters when the design is coupled, but also be used to describe functional requirements and directly obtain proper solutions. A fuzzy design scheme evaluation method was presented to improve the implementation of the information axiom. Finally, a computer aided design prototype system based on the proposed model was developed. And a case study of the structure improvement of a faucet demonstrated the validity and practicability of the system. © (2014) Trans Tech Publications, Switzerland. Source

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