Abstract: Sound barriers are more and more widely used for expressways, however, the already installed sound barriers lack a complete set of evaluation system. In this paper, the fuzzy mathematics theory was adopted to make a comprehensive evaluation of the sound barriers, in which 12 factors influencing sound barriers design were screened to establish an index system for sound barrier evaluation. On this foundation, Huang Luanzuang school along the Dan La expressway in Hebei Province was presented as calculated example for the fuzzy synthesis evaluation method application, which provides a new idea for evaluating sound barriers.
Abstract: In port engineering construction, the source of chloridion is concrete raw materials, admixtures and the penetration of seawater. Chloridion makes rebar corrosion, and makes the expansion and crack of reinforcement concrete, leading to concrete structural damage. By selecting the right concrete raw material, appropriate admixtures and to ensure concrete construction quality, in order to effectively avoid chloridion to the damage of reinforced concrete structures in construction.
Abstract: The results of theoretical research and earthquake damage investigation show that seismic response analysis of different plane structure in horizontal direction is different. Dynamic characteristics and seismic response analysis of four kinds of architectural models with different planes were analyzed by using the finite element analysis software. The inherent characteristics and earthquake time-history curves in different intensity level X, Y direction of displacement, velocity, acceleration and angle displace were studied. The results show that the seismic response of the four kinds of structures separates gradually, and the separation gap increases with increase of earthquake intensity. The building structure is safer in the long side direction than that in the short side in lateral earthquake response. The irregular structure can cause strong response in both horizontal in a single direction of earthquake effect. The second floor is a weak layer of the building structure which should be paid more attention to.
Abstract: On conditions of different weight，height, shape, slope gradient and the property of slope surface, the tunnel portal structure’s strain evoked by rock-fall impaction has been researched in laboratory by using a 1/30 scale similar model. The study shows that there is a simple linear relationship between the structure’s strain , the rock weight and the rockfall height when the slope gradient is specific and the slope surface is slippery and the multiple linear relationship between the structure’s strain , the rock weight and the rockfall height has been obtained. Effect of the shape of the rockfall and the property of slope surface on structure’s strain has been analyzed; The distribution characteristics of the structure’s strain of different parts of one cross-section and the same parts of different cross-sections has been comparative analyed.
Abstract: Risk analysis of slope instability in earth dams is presented using LHS –MC method. Latin hypercube sampling (LHS) is suggested as a tool to improve the efficiency of MC random sampling method. One example of risk analysis for dam slope instability is presented to demonstrate the validity and capability of the proposed method. By means of numerical example, it is shown that about 25% of the calculations can be saved by using LHS –MC method instead of simple MC. The exact savings, however, are dependent on details in the use of LHS and on the shape of the failure surfaces of the problems.
Abstract: The water entry problem of a wedge is simulated based on the velocity potential theory in time domain. The Complex Variable Boundary Element Method (CVBEM) is used in the stretched coordinate system. Before the simulation, the similarity solution is taken as the initial conditions. The auxiliary function scheme in conjunction with the same CVBEM is used to obtain the accurate time derivative of velocity potential and pressure distribution on wedge surface. The time marching solution is matched with the jet special treatment. Finally, the simulation results are compared with the similarity solution, which shows that the jet linear approximation can simulate the jet well.
Abstract: In this paper, the Standard k- ε equation turbulence model was used to simulate three-dimensional flow over a spillway. The volume of fluid method (VOF) was introduced into the iteration of calculation to solve the free water surface, and segregated solver was used with the PISO pressure-velocity coupling scheme. The free surface, the magnitude and distribution of the velocity, the pressure on the spillway surface and so on were obtained. The simulation results were in good agreement with the experiment data.
Abstract: Taking the rockfill dam of Nuozhadu as a example. Through the experiment on excavated softrock-contained rochfill with different deterioration degree, obtained related computational parameters. Useing Pseudo Load Method, compute and analyse effects of softrock-contained rockfill for stress and deformation of high core rockfill dam. Conclude that weathered soft rocks cause mechanical properties deterioration of rockfill, but only increase stress level of corewall upstream face, and destruction zone don't occur. It is feasible that softrock-contained rockfill are utilized in the secondary rockfill zone of high core rockfill dam.
Abstract: In a typical load condition of wind power equipment Installation ship, using the three-dimensional potential flow theory to prediction the long-term response of wave induced loads. then using the main load control parameters as a basis for the design wave selection, then application of DNV's SESTRA program make the wave-induced directly to the structure to finite element simulation. The results show that the hull structural design can meet the requirements.
Abstract: Based on fluid-solid two-phase coupling numerical model, this paper utilized velocity potential function theory to investigate the nonlinear interaction of water and free floating body. Meanwhile, multi-time step integral method and Overall numerical solution method, which are suitable for finite element dynamic analysis, and free surface boundary condition, not moving boundary conditions and the water-solid coupling boundary conditions are adopted to analyze the dynamic responses of water and free floating body with different dimensions. Numerical results show that the change of floating body sizes can obviously affect the dynamic characteristics of the fluid-solid coupling system, especially in the aspects of the stress responses of the floating body and the pressure responses of the water model.