Abstract: In recent years, various studies have been undertaken on how to use waste materials in Civil Engineering projects. Among waste materials, waste rubber has been highlighted to be used for different purposes such as reinforcing of soil and making of reinforced slopes. To investigate the properties of granulated rubber-soil mixture and its application in making of slopes behind retaining walls, some series of cyclic tri-axial tests and numerical analyses were carried out. In the former, dynamic properties of granulated rubber-soil mixture such as shear modulus and dynamic behavior were obtained and in the latter the effect of using granulated rubber-soil mixture on dynamic pressures and displacement of retaining walls during earthquake was investigated. The results of the present study showed that for all the confining pressures, with an increase in rubber percentage, shear modulus decreases while for any percentage of rubber inclusion, shear modulus increases as the confining pressure increases. In addition, new relations were introduced to define maximum shear modulus (Gmax) and Normalized shear modulus as functions of confining pressure and granulated rubber percentage. Regarding the dynamic analyses of the retaining wall, with an increase in rubber percentage, a decrease in dynamic pressure and residual displacement was observed.
Abstract: In order to investigate the inelastic deformation behavior of stainless steel beams, 4 stainless steel welded beams under pure bending and concentrated load were performed in this paper. The grade of stainless steel was approximately equivalent to UNS S31600. The relationship between load and deflection was discussed and the comparison between experimental results and results obtained by different methods, including finite element analysis method, simplified method proposed by Pro. Wang, Pro. E Real and EN 1993-1-4 Eurocode 3. The results showed that the deformation behavior of stainless steel performed non-linear load- deflection relationship because of the influence of nonlinear material properties. The deflections obtained by those methods were lower than the experimental results.
Abstract: Through the test and theoretical analysis of post-anchoring drawing method for inorganic materials, the paper discusses the influence factors of implanted reinforcement drawing technology for inorganic materials of the concrete structures and analyzes the influence of concrete strength, anchoring depth of implanted reinforcement, shape of reinforcement and diameters on the inorganic material reinforcement implanting technology, providing theoretical basis for the preparation of Technical specification for post-anchoring used in concrete with inorganic anchoring material.
Abstract: According to the renovation project of an arterial road, this paper systematically studied the pavement performance of cement stabilized recycled mixture in the base. Three types of mixture with three levels of recycled aggregate component were used to study the fatigue performance, which was assessed by the value of splitting tensile strength. This paper focused on the fatigue performance variation of the mixture under different levels of recycled aggregate component and tried to maximize the use of recycled aggregate in the mixture. Experimental methods and related research findings presented good reference for design and application of recycled aggregate mixture in the base as well as construct quality control.
Abstract: In order to improve the prediction precision of the short-term traffic flow, a prediction method of short-term traffic flow based on cloud model was proposed. The traffic flow was fit by cloud model. The history cloud and the present cloud were built by historical traffic flow and present traffic flow. The forecast cloud is produced by both clouds. Then, combining with the volume of the short-term traffic flow of an intersection in Guangzhou City, the model was calculated and simulated through programming. Max Absolute Error (MAE) and Mean Absolute percent Error (MAPE) were used to estimate the effect of prediction. The simulation results indicate that this prediction method is effective and advanced. The change of the historical and real time traffic flow is taken into account in this method. Because the short-term traffic flow is dealt with as a whole, the error of prediction is avoided. The prediction precision and real-time prediction are satisfied.
Abstract: The multiple-shear dowel connection with slotted-in steel plates is one of the most efficient joints for large cross section timber structures. Experiments were performed on dowel-type timber connections with one, two and three slotted in steel plates under lateral loads parallel to the grain. Test variables include the number of steel plates, the spacing of the steel plates, and the dowel diameter. Results show that the load-carrying capacity of the dowel-type connection increased as the number and spacing of steel plates in the same thickness of timber specimens. Finally, a model of the load-carrying capacity of multiple shear steel-to-timber connections is presented, which showed good agreement with the results obtained in the experiment.
Abstract: For rebuilding an ancient tower at province Gansu, the structure of dislocation steel joints was used make the tower having filtering contraction shape. For this kind of dislocation steel joints structure, there are no relevant calculation regulations in the Code for design of steel structures in China. To investigate the mechanical characteristics of the joints and ensure the safety of the joints and the whole structure under the applied and seismic load, the computer simulation research on the dislocation steel joint was carried out according to the design requirement. Under the extensive analysis the comprehensive understanding of the mechanical characteristics of the dislocation steel joints was obtained and the reference basis for design was provided.
Abstract: Aiming at the dynamic stability of the K8 single-layer latticed shell structures, it was carried out the dynamic stability analysis based on the finite element method(FEM) in this paper. The dynamic responses of the structure are calculated using the FEM and the B-R rule is applied to determine the dynamic instability critical loads. Results show that the dynamic instability is prone to take place in the K8 single-layer latticed shell structures under the severe seismic load and the dynamic instability critical seismic wave peak value is about 0.7g. The location of instability starts from the intersection between the third circular members and the radial members, then it spreads abroad until the structure collapses.
Abstract: In this paper, the dynamic response of concrete wall and steel fiber reinforced high strength concrete (SFRHSC) wall under blast load is simulated with the explicit dynamic finite element method. The J-H-C model is used for SFRHSC and the material parameters are determined based on the test results. The damage and strain rate effects are considered in above material model. The influences of scaled distance on the dynamic responses of walls are investigated and discussed.