Applied Mechanics and Materials Vols. 488-489

Abstract: Project financing of ESCO is the key link to conduct EEEB. The more scientific project financing strategies are affected by some inner factors, such as financial situations in a corporation and corporate business objectives, and involved by some external factors, such as project status, marketing character of energy saving service market and constraints by policy and law. From the analysis on reciprocal action between inner and external factors, financing cost, financing risk and income from investment are the three main factors to choose an appropriate financing mode. ESCO can implement project financing by enhancing enterprise competitiveness, improving the market climate and fostering a normative policy and law environment.

Abstract: Understanding the characteristics of stochastic loading is the premise and foundation for structure analysis. Traditional amplitude spectrum and power spectral density (PSD) method based on Fourier transform (FT) has limitation, that is, it loses any information with time and can not reflect the non-stationary characteristics of stochastic loading. Wavelet transform possesses assembling ability in both time and frequency domain,and it possess stronger ability of analyzing non-stationary signal. In this paper, the method of estimating PSD and time-dependent PSD of stochastic loading using wavelet transform is researched. The calculating process is programmed and the method is validated by a numerical example. The analysis result of example indicates that the method presented in this paper is feasible.

Abstract: The safety of underground tunnels under explosions is of many meaningful engineering values, especially as the weapons are provided with high-precision and strong penetrability. This passage analyses the explosion resisting capacities of tunnels at different scales. The theoretical similar relationship is deduced by using the dimensional analysis and the physical dimensions are the controlling factors if the materials and other factors keep the same. And an example including two models is calculated and the results verify the validity of the similar theory.

Abstract: The symmetry is a remarkable aesthetic characteristics in the traditional Chinese architecture. Through analyzing the different manifestations of symmetry in the settlement planning, in the construction of the architectural settlements, in the arrangement of the building complexes and in the structures of single building and its decorations, the paper explores it as an aesthetic technique and a cultural carrier bearing the traditional Confucianism, Daoism, peoples ideals and wishes, and proposes to reconsider its cultural connotation and significance in the modern architectural design as well as the social life, achieving the balance and harmony outside and inside of ourselves.

Abstract: Layout for K node of steel tubular UHV transmission tower is analyzed in systematic and all-sided with finite element calculation in this paper. The recommendation is that as no applicable formula is available at present, existing specification can still be used for calculation but with a safety margin of more than 10%. K node connected in intersecting welding manner with appropriate stiffening rib will improve the stress, gender more uniformed stress distribution, and effectively reduce stress concentration. Welding connection features smaller displacement and maximum stress and more uniformed stress distribution relative to plug-in connection, therefore it is recommended to be used for K node with slope.

Abstract: This study focuses on a super-large bridge in mountainous terrain. Through field measurement, it explored the wind environment characteristics on the location of this bridge, simulated the three-dimensional wind field of long-span half-through arch bridge, and deduced the motion equation and amplitude expression formula of the vortex-induced vibration of large-span half-through arch bridge. By numerical analysis, the vortex-induced vibration response values in completion state and maximum cantilever state are calculated.

Abstract: Influence factors of sidewall stability contain mechanical factors and chemical factors. Among them, the chemical factor is the internal cause of the sidewall instability. Based on the collection of the influence factors of physical and chemical properties of the shale, we decided the main factors that influence the stability through the simple correlation analysis and applied a kind of quantum neural network based on the multilayer excitation function. We established the quantum neural network forecast model of shale physical and chemical properties that can effectively improve the network convergence speed and the accuracy of prediction. The quantum neural network prediction model analysis show that human factors interference of this method is small, and the system parameters needed less, wide application, the result is reliable, can effectively reflect the shale physical and chemical properties and fabric characteristics, to provide a reliable basis for preventing sidewall instability.

Abstract: The ABAQUS software is used for simulating the vertical bearing capacity of bucket foundation of different ratios of diameter to height and the analysis for the stress and displacement distribution and load-displacement curve. When the bucket foundation is under pressure, the vertical stress of the soil distribution changes from the bottom to the top, and then spreads to most part of the soil in the bucket foundation. The vertical displacement of the soil develops from the top of foundation and spreads inside, then expands to the outside range, the maximum displacement occurs both at the bottom and inside. According to the analysis of the ultimate bearing capacity of the bucket foundation, it could be found that when the height of the bucket foundation remains unchanged, the ultimate bearing capacity increases with the increasing ratio of diameter to height. If the ratio of diameter to height is less than 1.2, the ultimate strength increases significantly. If the ratio of diameter to height is greater than 1.2, the increasing speed of the ultimate bearing capacity changes slowly. When the diameter of the bucket foundation is constant, the ultimate bearing capacity decreases as the ratio of diameter to height gradually increases, and it decreases at a homogeneous speed. So the ratio of diameter to height 1.2 can be used as the optimum point of the ratio of diameter to height of the bucket foundation.

Abstract: Through experimental study on the flexural impact properties of different dosage of plastic-steel fiber and steel fiber reinforced lightweight aggregate concrete, the results show that energy dissipation of cracking and damaging of steel fiber reinforced lightweight aggregate concrete increase with the increase of fiber ratio. However, energy dissipation of cracking and damaging of plastic-steel fiber concrete increases in early stage and decreases later with the increase of plastic-steel fibers. Enhancement effect of energy dissipation of damaging of plastic-steel fiber is higher than steel fibers.

Abstract: Currently, most rice hull is piled up or burned naturally, resulting in many environmental problems. It is a potentially good way to incinerate specially rice hull into the ash that is used as concrete admixture. The research work was done and results indicate that the compressive strength of the concrete with addition of 1%, 2% and 3% of rice hull ash increased by 6.8%16.7% and 15.1% respectively compared with control samples. And the compound addition of rice hull ash and gangue not only improved the mechanical and anti-freeze-thaw properties of concrete, but also decreased the cost of concrete production.