Applied Mechanics and Materials Vols. 477-478

Abstract: Truss spar model was tested using regular waves in a wave basin and the responses in surge, heave and pitch were measured. A program was developed to determine the responses using numerical method. This program was run using the model parameters. The results are agreed well with the corresponding results obtained from the test measurements. Then this program was applied to a prototype spar simulated results were compared with the corresponding numerical results and test measurements.

Abstract: Regular health monitoring of bridges is a vital process to prevent serious structural damage. Marker-based systems, which follow the trajectory of objects by placing a well-characterized pattern on their surface and identify them on photos or videos taken of these objects, have proven to be a cheap and flexible alternative for such tasks. In this work, we extend our previous laboratory implementation with a low-cost, fully automatic on-site installation at the bridge at Arosa Island, Galicia, Spain. Preliminary results presented in this paper show that our system is highly robust for the harsh climate of the installation site.

Abstract: This paper shows the relevance of aerodynamic testing of bridge structures, lists the main documents regulating them, and describes the main features and procedures of these tests.

Abstract: In this study, hydraulic model testing is used to optimize the flood discharge and energy dissipation body type of some power plant. Compared from the flow regime, bottom velocity, dynamical pressure and so on, it is found that the fluctuating pressure and bottom velocity at the exit side wall stilling pool bottom, are impoved by surface outlet contraction and intermediate outlet contraction, the largest bottom flow rate of surface outlet is about 13.6m/s, the maximum fluctuating pressure of stilling basin is approximately 6.7×9.81kPa. The problem of large bottom flow rate and fluctuating pressure are solved by this testing result, the result provided references for design.

Abstract: Estuarine offshore area is the gathering area of sediment which is from watershed into sea. There has important theoretical and practical significance about researching the transport characteristics and the variation trend of the suspended sediment concentration (SSC) in this area. On the basis of analyzing the long data about recent 50 years to the Yangtze estuarine offshore area, there are some results: in time aspects, the SSC in dry season is higher than it in flood season, and the SSC in spring tide is higher than it in neap tide; in longitudinal distribution aspects, there is a decreasing trend about SSC from west to east, and the decreasing level of the SSC is ever-reduced from west to east until the SSC remains basically low and unchanged in the east of 123°E; in transverse distribution aspects, the SSC has high locations. Furthermore, there has a preliminary discussion for the variation of the SSC in the offshore area with the reduce of the sediment from watershed, comparing with the last century (1950s, 1970s, 1980s, 1990s), the SSC in the offshore area has a reductive trend, it shows good consistency between the variation of the SSC in the estuarine offshore area and the decrease of sediment from the Yangtse River into sea.

Abstract: The post evaluation of Water Project in Xiasha district is taken as the object of study.The social influence of the project is evaluated from different parts according to the fuzzy analytic hierarchy process. Subjective and objective weights are combined to form the combined weight,taking the minimum information entropy as a tool.The fuzzy AHP comprehensive evaluation model of Water Project social influence in XiashaDistrict, which is based on entropy weight, is set up.The calculation result shows that the method is effective because the analysis result of the model, the project construction and environment characteristics achieve the basic agreement.

Abstract: To meet the needs of the security for the oil and gas production, the safety monitoring methods and technical requirements for the artificial islands in coastal areas during the operation periods are presented. This thesis constructs on the basis of safety monitoring during artificial island operation periods in Jidong Nanpu ilfield, which develops and establishes automatic safety monitoring system of artificial island in China for the first time. The result of preliminary operating shows that the artificial island 1-3# exhibits obvious differential settlement and shrinkage phenomenon during the operation periods. The research results provide ten technical basis and guarantees for the safety construction and management of artificial islands .It will play a guiding role in the safety monitoring during the operation periods.

Abstract: Based on the theory of contact force, 3-D frictional contact non-linear dynamic contact model was put forward. It got across to search contact face, and ensure contact state. In succession, it asked for contact force under satisfying contact condition and dynamic balance condition. With the earthquake loading, the model simulates opening, closing and sliding of arch dam with contraction joints.

Abstract: The bonded interface between FRP plate and the hydraulic concrete is a key part while reinforcing the hydraulic concrete structure with FRP plate. The bond property of the interface directly decides the results of structural reinforcement. In most of the external loading conditions, this interface is under the shear stress state. Therefore, accurate measurement and analysis of interfacial shear stress distribution is the guarantee of FRP reinforced hydraulic concrete structure the premise of success. Focusing on the shear-resisting bonding strength of FRP-concrete interface, this paper improved the ASTM D905 standard shear sample and carried out numerical simulation of shear test to the bonded interface of FRP-reinforced hydraulic concrete structure by adopting the bi-dimensional finite element method, and conducted parameter analysis of the influence factors (elasticity modulus of FRP and concrete, shear modulus and thickness, etc) of shear stress on the FRP-concrete bonded interface and finally the distribution characteristics of shear stress on the bonded interface were obtained. This paper mainly discussed the influence rules of stress concentration to the distribution of shear stress on the bonded interface, which provides theoretical guidance and direction to the shear-resisting bonding strength test in the next step as well as technical support to the processing of FRP-strengthened hydraulic concrete bonded interface.

Abstract: Simulation models of resistance mufflers with different typical structures were established, through the computational fluid dynamics method, under the conditions of different inlet velocities, by analyzing distribution characteristic of velocity field and pressure field for flows internal the mufflers, a kind of mathematical relation among the inlet velocity, inlet/outlet pressure, and pressure loss was discovered. Through CFD simulation computation and practical measuring tests of above three parameters for practical muffler with complex configurations, the mathematical relation of them was proved to be correct. With the conclusion, while inlet velocity changed, the variable conditions of inlet/outlet pressure and pressure loss for resistance mufflers could be estimated approximately Therefore, the test expense could be saved, and the designing efficiency for mufflers could also be further improved, so it would bring a certain economic benefit,which would be of great significance for energy saving research of mufflers.