Applied Mechanics and Materials Vols. 99-100

Abstract: A evaluation model based on the integration of analytic hierarchy process(AHP)-rough set theory (RS) and radial basic function (RBF) neural network is put forward for grasping the hydropower project financing risk.The Particle Swarm Optimization (PSO) algorithm is implemented to optimize the node numbers of the hidden layers in the model. The study indicates that the AHP-RS and RBF neural network connecting with improved PSO method is an attractive alternative to the conventional regression analysis method in modeling water distribution systems.

Abstract: In order to seek the distribution rule of station passenger flow and discuss research methods of public transport based on station, prediction model of station passenger flow volume was proposed with the fractal theory. Firstly, it used correlation dimension to establish a time series forecasting model, which analyzes the time distribution rule of station passenger flow with the phase space reconstruction theory. Finally, it took the stations of Route 255 in Changchun as example, which used the time series forecasting model to forecast the station passenger flow volume at moments. It is shown that the model obtains a less error and a greater application value.

Abstract: Research on the division of the overlying rock roof of stope has great significance. The existing classification method is based on the determination of existing mining height and loose coefficient , and such studies have been proved exist some limitations in the applications of thick coal seam full coal mining. Theoretical analysis and similarity simulation experiments show that during the mining all height at one times in thick coal seam, as the recovery room increase ,the thickness of immediate roof of the overlying strata which fall with the mining increased signifi-cantly, and the structure of the overlying critical layer to stabilize that is the layer of hypogyny basic roof gradually increased. Through theoretical analysis and summarizing similar simulation experiment phenomenon, based on the definition and characteristics of the immediate roof and main roof, with elastic thin mechanics and the key strata theory as the research foundation, doing scientific classification of mining face's roof in all height at one times in thick coal seam, and combined impact of all factors, which influence the breakage and caving of Basic Roof, to estab-lish a scientific judgment in the length of work face and the pressure of basic roof for practical production relations, provide certain theoretical basis.

Abstract: The tensile strength and ductility of normal concrete are dissatisfactory and these lead to some durability problems for reinforced concrete structure. On the other hand, China’s production and consumption of concrete is the largest in the world, and with the rapid economic development the number also continue to increase. A new class of more sustainable cement-based materials is urgently needed in China. This paper reports on the development of engineering cementitious composites (ECC), and a unique green high-performance fiber-reinforced cementitious composite (GHPFRCC) with high volumes of fly ash and PVA fiber is proposed. The detailed procedure of GHPFRCC is presented. The calculated equations of the load-bearing capacity of the reinforced concrete column retrofitted by GHPFRCC are proposed.

Abstract: Research on multiple settlements in Shenyang and the residential areas and ecological areas of Shenyang Jianzhu University, testing the underlying surface material surface temperatures by infrared thermometer and testing the solar radiation by bolometer. Study different material surface temperatures variation. Explore the physical properties of materials effect on the microclimate and draw the appropriate conclusions.

Abstract: Under earthquake action there are irregular rotating displacements in the curved girder bridge, and the effective seismic mitigation method for curved bridge need to be systematically studied. The spatial finite element model is established for a curved continuous girder bridge with double-column piers. Energy dissipation dampers including E-steel dampers, viscous dampers, friction pendulum bearings and lead rubber bearings are set in radial and tangent directions of the curve at the positions of active bearings. The seismic mitigation effectiveness and seismic response characteristics of the curved girder bridge are calculated and analyzed with the four energy dissipation approaches under three dimensional ground motion action. The results indicate that the four energy dissipation approaches can all effectively reduce the bending moments and torsional moments at the bottom of piers, and the bending torsion coupling effect of the curved girder bridge is decreased a bit. The difference of internal force for inside and outside piers is reduced after the dampers set for the curved girder bridge with double-column piers. Relatively, the viscous damper approach can further reduce the whole seismic responses of curved continuous girder bridge, and is an excellent seismic mitigation method suitable for curved girder bridge.

Abstract: .It is availability to improve GM(1,1) forecasting precision based on the combination of GM(1,1) model and linear regression.But,it is no good to deal with no-saltation points always based on linear regression,and deal with saltation points based on equidistant GM(1,1) model.So,in the paper，it has definite meaning of theory and practice to advance a new GM(1,1) combination model to solve the problem.Finally some examples are given in the paper.

Abstract: The construction contracts are the important basis of the project risk management and a reasonable contract system can effectively share engineering risks among various project participants. However, the current situation of risk management in China is not optimistic. Based on the analysis of the existing problems in the risk sharing management, the paper introduces Hall three dimension structure into the engineering fields and establishes a three-dimensional (contract dimension, procedure dimension and logic dimension) space structure of the construction project to elaborate the vital role of the contracts in the project risk management. Finally, the paper attempts to put forward a risk sharing mode centered on contract systems to make a reasonable and effective risk distribution among various project participants

Abstract: For the stability of scaffold commonly used in civil engineering, the continuous compressing bar calculation method with multi elastic supports and multi nodes is adopted with the weight of the bar considered based on a variety of traditional method. It is applied in the scaffold design and calculations of Yuping Yihe Bridge of Shandong Linyi. The calculating results show that, in general, the impact of the weight of the scaffold itself on the critical load can be ignored. But when the scaffold weight is large, the critical load has decreasing decent. The scaffold design proposed based on this method proved reasonable and reliable and ensured the smooth progress of the construction.

Abstract: Because of the Dynamic Drainage Consolidation method’s complexity, the dynamic characteristics of soft soil is not be described by conventional analytic method. In this paper, Numerical simulation was conducted by use of FLAC3D. And effect of reinforcement was analyzed under the different influential factors. These factors include rammer weight, rammer falling distance, rammer radius and ramming energy. Furthermore, the field test was carried out to verify the numerical simulation, the conclusions have theoretical guidance meaning for researching the consolidation mechanics and improving the construction method of Dynamic Drainage Consolidation.