Advanced Materials Research Vols. 926-930

Abstract: The shear lag effect will cause damage to the curved box girders. And it will adversely affect the bridge’s seismic performance. In order to analyze the effect under seismic loads, finite element models were created in this paper. By changing the parameters, such as curvature radius, width and height, their influence on the shear lag were studied. Results show that the effect was more obvious in wide and flat box girders under seismic load.

Abstract: In order to achieve mine well through, improving efficiency and accuracy through survey underground. The Authors based on the accuracy of better than 5" precision orientation measuring instrumentGAT magnetic suspension gyro total station. Taking Well no.1 of An Jia-ling precision through-survey as an example, the authors use GAT gyro station in the inoue and underground. According to the observations and adjustment, the accurate positioning of underground traverse survey. The example analysis results show that the instrument constant measurement precision is 2.6", between two observations in azimuth biggest difference is 5"; with Gyromat 2000 gyro total stations observation data comparison, azimuth angle different is only 4", quantitative analysis of demonstrated GAT gyro total station has a good stability and high accuracy.

Abstract: Based on a typical loess landslide of K135+514 ~ +678 section of a Highway in Shaanxi Province, the formation mechanism and the possible failure mode of the loess landslide are analyzed, and the stability of the loess landslide is evaluated. The calculation results show that the landslide is in a stable ~ basically stable state during natural condition and in unstable state after working condition. According to the basis of those analyses, the treating measures of the landslide are put forward. At last after the schemes’ comparison the "anti-slide pile + unloading + slope drainage+ plant greening" comprehensive control scheme is determined, this has certain reference significance for the similar engineering in the future.

Abstract: With the development of society and science,Our country began to advocate "green environmental protection, energy conservation and emissions reduction". Construction as an important component of the national economy, have begun to attach importance to the development of electrical energy-saving technologies. Energy-saving technology can save resources, ease the energy crisis and to improve the quality of people's lives and the environment. In construction, the use of electrical energy-saving technology, can effectively improve the quality of construction, architectural resources, reduce waste, improve resource utilization. This paper briefly describes the electrical energy-saving technologies, analyzing the status of construction, energy-saving technology in the construction of electrical engineering.

Abstract: The limit equilibrium FEM method is a common method using the result of stresses fields obtained from numerical calculation to get resistant sliding force and driving sliding force on the dangerous sliding surface to analyze the stability of slope. The safety factor is the ratio of resistant sliding force to driving sliding force on the most dangerous sliding surface.When compares limit equilibrium FEM method with the rigid body limit equilibrium method, its applicability needs to be verified. Taking a project as an example, this work uses the two methods to analyze the stability of the slope. After calculating, two different safety factors on the sliding surface were got, and the reasons inducing the difference of the safety factors were analyzed. The result showed the safety factor calculated from the limit equilibrium FEM method is much closer to the real situation especially when some parts of the soil are in plastic state. It is mainly because the limit equilibrium FEM method takes the coordination of deformation into consideration. Then two conditions: nature and rain are calculated to analyzed the slope stability. It made a judgment of the stability of the slope and gave a beneficial conclusion to the project.

Abstract: At present, small radius looped prestressed tendons have been widely used in cable-stayed bridge anchorages; the error limitation of stretch elongation in prestressed technology is 6 percentage, but in field it always exceeds the limitation. In this study, the main factors which lead to the stretch elongation were analyzed through a field full-size model test of a cable-stayed bridge. Moreover, the behaviors of ring prestressed tendons were studied for different penetrating strands technology and some advices and suggestions were finally made to offer an example for similar engineering.

Abstract: Through a pull-out test was designed. The load-slip curves between recycled concrete with different recycled coarse aggregate replacement percentage and rebar were recorded. This article studied the impact of different recycled aggregate replacement rate and the anchorage length for the bond strength between the recycled aggregate concrete and reinforced, and provided a beneficial reference for engineering design of recycled concrete structure under similar conditions. Determined the recycled concrete and reinforced the bond-slip constitutive relation. Come to the bonding properties of reinforced recycled concrete with recycled aggregate rate increase gradually decreased in the anchorage length sufficient to meet the design requirements, performance depended on the pull-out strength of reinforced recycled concrete and reinforced the bond.

Abstract: When calculating compressive resistance reliability of gravity dam using the elasticity stochastic finite element method, as a result of stress singularity of dam toe, elements near the dam toe has been encrypted to different mesh size, find a point along the foundation plane that its compressive resistance reliability index is not sensitive to mesh and it is nearest to the dam toe, select the compressive resistance reliability index of the point as the compressive resistance reliability index of gravity dam. Take Longtan RCC gravity dam as an example and give the analysis results.

Abstract: Main detection and monitoring technology of bridges construction concealment engineering were carried out investigation and analysis. The use of concealed engineering inspection technology, monitoring technology were overviewed and analyzed. The development status of detection, monitoring technology at present reviewed and analyzed. Detection technology parameters on the internal prestress were compared. Technology development trend and foreground detection of concealed engineering were presented. Key words:bridge structure、concealed engineering、detection technology、monitoring technology、stress statement

Abstract: The important problem is structure safety of large bridges. Building the structural health monitoring analysis management system can effectively assurance the safety and reliability of bridge. It was introduce the development process of structural health monitoring analysis management system of cable-stayed bridge of line 5on BEIJING metro. It was focus on development requirements, design ideas, the warning alarm settings of system. The research achievements of this paper can offer some reference value for similar projects