Advanced Materials Research Vols. 368-373

Abstract: In view of the significant failure modes of formwork-supporting system and reinforced- concrete member, the reliability analysis model of time-dependent system affected by human errors during the construction of typical multistory reinforced-concrete buildings was developed. Human Reliability Analysis (HRA) method was applied to simulate the error rates and error magnitudes of the reinforced-concrete members and the formwork-supporting system, and human reliability models were developed, two cases for error-free case and error-included case were considered. Furthermore the check emphasis of formwork-supporting system was pointed during multistory building construction.

Abstract: Taking a half-through concrete-filled steel tube(CFST) tied arch bridge with span arrangement (40m+200m+40)m as an example, this paper make a study of tower’s stability, construction monitoring and control during vertical rotation of the arch rib. Using the finite element method to simulate the rotation construction phase of the bridge by the way of normal erection calculation, the effect of several different factors to the tower’s instability is analyzed in detail. On the basis, we obtained the effective measure to ensure the tower stable. Meanwhile, survey the tower’s stress and deformation to supervise the tower during the rotation construction. Finally control tower top displacement and its foot stress to guarantee the rotation construction of the CFST arch bridge quality and safety.

Abstract: The use of industrial CT systems, and special loading equipment, combination of coal and rock under uniaxial compression load test real-time CT scan obtained at different loads under various stages of the CT images. Using digital image processing technology to coal combination of the CT image gray stretch and pseudo-color enhancement to improve image contrast, highlighting the cracks and pores of the edge information. To establish a combination of coal to the coal from the rock micro-crack interaction and its associated macro-deformation, further study coal - roof and floor damage and the impact of mechanical systems to the mechanism of pressure to provide experimental basis.

Abstract: With China's accession to the WTO and the development of knowledge economy, human capital's role in the construction business has become increasingly important. human capital has become a key factor in the competitiveness of enterprises. This paper analyzes the human capital and competitiveness of construction enterprises Mechanism. And on this basis, bring up the corresponding strategies human capita in lnvestment to improve the competitiveness of construction enterprises

Abstract: Taking a group of SPSW with openings with or without edge members as example, this paper states the importance of edge members in view of initial stiffness, ultimate bearing capacity and ductility. First, FEM analysis is carried out to study the reasonable stiffness-range and it is found out when the inertia moments ratio varies from 6 to 8, edge members not only provide adequate anchorage, but also resist loads directly with main frame. Then, an unified calculation model called USMO is proposed, whose key point is to add inversed compression bars with stiffness to tension zone to simulate the increase of ultimate bearing capacity, leaving shearing part same to USM.

Abstract: In the first phase of the project of AnHui Province New Broadcasting Center, the CT-1 foundation of tube cushion cap in main building is 3.5m in thickness which belongs to massive concrete. In order to prevent the crack caused by the excessive hydration heat in massive concrete, the project take several actions including optimizing dosage of cement concrete mixture, setting post-cast strip, cant layered casting and temperature monitoring after concreting, etc. All these actions regulate the concrete temperature and restrain crack generation successfully, while insuring the construction quality of massive concrete cushion cap.

Abstract: Because of the low power loss and high stability, foil bearings are suitable lubrication components for high speed rotational systems. At present, the foil bearings used in actual applications almost have complicated structure and are hard to manufacture. In this paper, two kinds of foil thrust bearings with simple structure are presented. Configurations of these two foil thrust bearings are introduced; meanwhile, the load capacity and running stability are also tested in a high speed micro turbine. It is shown that viscoelastic supported foil thrust bearing has higher load capacity and hemisphere convex dots supported foil thrust bearing is more stable in high speed operational condition.

Abstract: Shear walls are commonly used as structural elements to resist earthquake. The seismic performance of shear wall can be guaranteed under small earthquakes, but problems exist when it is subjected to large earthquakes. To improve the ductility and energy dissipation capacity of shear walls in large earthquakes, shear failure must be avoided and the performance of plastic hinge region must be improved. The adaptive-slit shear walls (ASSW) is proposed in this paper The mechanical characteristics of ASSW satisfy the requirements of structures under different seismic level. Therefore the damage process of ASSW can be controlled and the ductile shear failure can be realized, which obviously improve the seismic performance of shear wall structures.

Abstract: With an independent foundation reinforced applying section-enlarging plan as an example, the contact stress distributions between foundation and groundsill in 6 conditions were analyzed by finite element method and the pattern of stress distributions were discussed. Variable parameters include values of load on foundation and compression modulus ratio K of new and old foundation. The result showed the ratio of old foundation’s contact pressure to that of new foundation was about equal to the K. Based on the analysis results, consider the two times loading effect, the force diagrams of foundation strengthened were presented.

Abstract: In order to accurately simulate the diffusion of chloride ion in the existing concrete bridge and acquire the precise concentration of chloride ion at any time, a Cellular Automata(CA)-based model is proposed. Firstly, the process of chloride ion diffusion is analyzed by the CA method and a nonlinear solution to the Fick’s second law is obtained. Secondly, considering the impact of various factors such as stress states, temporal and spatial variability of diffusion parameters and water-cement ratio on the process of chloride ion diffusion, the model of chloride ion diffusion under multifactor coupling is presented. Finally, a chloride ion penetrating experiment is used to prove the effectiveness and reasonability of this present method. A T-type beam is taken as an illustrative example to analyze the process of chloride ion diffusion.