Applied Mechanics and Materials Vols. 71-78

Abstract: Asbestos is used as reinforcing fiber in nearly all the current external wall board manufacturing process, but it has harmful effects on the human body. In this paper, composite-fiber reinforced external wall board without asbestos was successfully prepared using plant fibers as reinforcing material instead of asbestos by compression molding. Effect of the content of wood fiber, wood powder, quartz sand and water on the density and mechanical properties of the board were studied in this work. Besides, the optimized preparation method for composite-fiber reinforced external wall board without asbestos was achieved.

Abstract: Infrastructure provides the key facilities to the nation’s economic prosperity, public safety and security, and social development. To improve the physical condition of infrastructure, the status of a nation’s infrastructure should be continuously and properly evaluation. This study discusses the principles of national level infrastructure condition assessment, and then proposes a comprehensive assessment metrics in fifteen infrastructure objectives. The result provides a practical guideline by which a nation can conduct a viable infrastructure assessment.

Abstract: Polystyrene formwork of lattice concrete wall is a set of lightweight, insulation, sound insulation, fireproof, bearing multi-function in one of the "EPS new energy-saving" wall structure system. Through the polystyrene formwork structure forms of optimized improvement built in construction process of collapse produced high wall plate phenomenon. Do an axial compression ratio of 0.2 lattice specimens of reinforced concrete shear wall in axis pressure and reciprocating level forces test. The damage form of that wall for wall bottom beam-column central cross core ring crack and appear "X" type crack and are crushed. The mesh wall formed strong vertical limb and weak horizontal limb，belongs to the ductility structure , and has more yield , and energy dissipation capacity , and wall overall performance is strong , and avoid brittle failure , and has good ductility、deformation ability and bearing capacity of the characteristics of big .The finite element analysis and experimental results indicated that the ultimate bearing capacity of the wall are the same. For new formworks do wall by finite element analysis, in do not affect its aseismic capacity premise that wall structure forms are optimized design.

Abstract: In this paper, the concept of system capacity is expounded from the perspective of the system theory. The selection of control index during the aseismatic design of frame infill wall structure is discussed, and the critical techniques of the system capacity method are proposed. Finally, the process of the aseismatic design method based on system capacity is developed.

Abstract: Domestic and foreign scholars have been studied rock characteristics , but the study results not nearly same with rock nonlinear characteristics. it different rock crushing test conducted many studies ,because it has not the rock broken theoretical basis .This paper try to study the deep rock distribution (under the load before static load) by concentrated load ,it is proposed for deep rock fragmentation theory and methods. In the rock is often under stress , the stress number is measure pressure ,the rock stress state is Related for the elastic potential energy stored and the energy is proportional to the rock depth and volume occurrence. when the stress turned from ,the rock energy will accumulate or release .when the rock energy release ,the rock particles displacement may be elastic displacement or plastic displacement.

Abstract: The building of the dwelling house has been paid much attention after the reform and opening policy. In recent years, people are aware of the concept of low carbon and ecology. This article analyzes the exsisting situation, necessities and energy-saving strategies of eco-lighting design for sustainable development and environment protection of dwelling houses.

Abstract: Accumulation strength has poor ability in red bed slope and its self-stabilize is lower than normal slope. Red bed slope composed with accumulation can cause more disaster risks for highway slope engineering. As the main treatment structure, anti-slide pile can provide huge anti-slide force, and achieve better results. Bent type anti-slide pile is combined by horizontal structure. For thicker accumulation area and larger slope thrust area, project can get obvious treatment effect by bent type anti-slide pile. The paper analyzed the characteristic of red bed slope composed with accumulation and bent type anti-slide pile. A case of Guangyuan-Bazhong Expressway K63 Hejiamiao Colluvial Clay is showed below, in order to explain good treatment effect by the structure in slope engineering. At last, construction technology of bent type anti-slide pile suggested by the project.

Abstract: The cracks were pre-settled to the R.C. frame structure caused by earthquake which was defined as the damage index ω during the modeling process with analysis software-ANASYS. The temperature field contour curve were calculated for the column and beam, the law of deteriorated bearing capacity with time for the R.C. frame structure under elevated temperature were brought forward，which can adapt to R.C. frame structure with different damage index ω caused by earthquake.The relationship between ω and deteriorated bearing capacity for R.C. frame structure was also given, which was proved to be effective and correct according to comparison with the data recorded from the elevated temperature experiment designed by author.

Abstract: Three R.C. frame structure models were designed with named KJ1, KJ2 and KJ3. Elevated temperature experiments were carried out to KJ1 and KJ2 with concrete crack width 0.2mm and 0.4mm respectively which was taken as the damage index ω caused by earthquake, KJ3 was directly undertaken to elevated temperature experiment. The laws of concrete crack development, axial deformation of frame column and standard heating curves were studied. The law between concrete crack ω and deteriorated performance for concrete frame structure was put forward, which can be a good reference for research on fire resistance performance of R.C. frame structure after earthquake.

Abstract: To figure out the structure and influencing factors of welded welded turnout slab convex block of ballastless track on bridge, according to the characteristics of force and displacement of welded turnout on bridge, the turnout-bridge-platform integration computation model was established by finite element method. Taking the ballastless turnout on a continuous beam bridge as the example, the longitudinal force and displacement of the bridge and parts of the turnout was obtained by the means of changing the numbers of slab, the stiffness of convex block support and the temperature range of slabs. The calculation results indicate: using three slabs is reasonable for the ballastless turnout on bridge; The stiffness of convex block supports on slabs should be set between 250kN/mm and 300kN/mm; Since the change of longitudinal force is very large, while the other parameters change little, with the change of the temperature range of slabs, slabs in turnout should be strengthen.