Applied Mechanics and Materials Vols. 496-500

Abstract: The mechanical performances are studied for the aluminum cellular metal through finite element analysis (FEA) method in the paper. Cellular metal is a kind of complex structure with good performances using in many fields. The paper analyzes three different kinds of regular cellular metal structures, including two Kelvin structures and one cubic structure. The models of the three structures are established in CAD system. The mechanical performances under different directional forces - namely normal, 45-degree and shear forces - are simulated through FEA. Both the elastic and plastic performances are taken into consideration. The result shows that the stiffness of the cubic cellular structure is the strongest among the three structures. All the three structures could hold more normal force than the other two directions. The yield stress of the cubic structure is bigger than that of the staggered Kelvin structure.

Abstract: Compare with several transmission tower vibration monitoring methods, analyze the advantages and existing problems, present a monitoring method for tower vibration based on fiber grating sensor technology, and introduce the fiber grating sensor about its working principle and absolute preponderance in application, design a strain monitoring system which satisfied for the requirement of tower safety pre-alarm.

Abstract: Based on the single fiber pull-out testing, the resistance of carbon fiber cement increases during the tensile test in elastic stage. Through the experiment, The fiber embedded length shorter, sample pullout strength is greater. But the resistance change rate is smaller, the lower the sensitivity of the sample. So, considering the fiber length and interface set interface effect of carbon fiber reinforced cement based composite resistance model. A simple model was proposed to explain the mechanism of compression sensitivity of carbon fiber reinforced cement-based composites based on interface effect. The results showed that the content of carbon fiber and interface strain can change the sensitivity of CFRC.

Abstract: The article is devoted to the characteristics of foam concrete with the application of nanostructured binder (NB) on the basis is amorphous aluminosilicate rocks. The optimal technological parameters of the production of nanostructured perlite binder (NPB) were stated. The selection of foam generating agents was accomplished and mechanisms of formation of cellular composites on the basis of NPB were studied. Physical and mechanical characteristics of the obtained material were determined.

Abstract: The article introduced the advantages and disadvantages of unbonded prestressed concrete. In project application, its property under load and the design method and durability precautions.

Abstract: Based on qualitative and quantitative analyses, this study determined the benefits and advantages of green-wall materials compared to traditional wall materials. These materials were further applied to construct walls and roofing in new rural construction projects to confirm that using composite green-wall materials is currently the fundamental direction in material use for relevant projects.

Abstract: As a regional metamorphic rock, the engineering properties of the phyllite are rather complex. It is common that the tunnel construction safety has tremendous difficulty due to the groundwater, the initial stress state, joints, cracks and faults and other factors, so it is necessary to find an effective construction method for the construction of phyllite tunnel. To master the regular pattern of the influence of relative factors on physical and mechanical properties of phyllite is the basis to establish an effective construction method. The paper tries to analyze the influence of water and mineral composition on physical and mechanical properties of phyllite by making relevant tests on Lu Lin tunnel, and hope to give some clue to the design and construction of phyllite tunnels.

Abstract: Workability, strength and fracture mechanics of polypropylene macro-fiber reinforced Reactive powder concrete (RPC) were studied in this work. The results showed that the incorporation of macro-fiber could influence the workability of RPC, the slump of RPC decreased with the increasing of macro-fiber content; compressive strength decreased while splitting strength increased with the increasing of macro-fiber, meanwhile the flexural strength invariant. Macro-fiber could strongly enhance the flexural toughness of RPC and changed the failure mode from brittle to ductile; fracture energy tends to increase linearly with the increasing of macro-fiber.

Abstract: In this study, the use waste of natural fiber applied in building facades and green roofs vegetation materials to reduce production costs and price, prompting facade green roof vegetation universal use, reduce the heat island effect to improve indoor and outdoor microclimate environment and ecological house in Taiwan, ecological communities, ecological city to create an inject vitality. The media of planting Cynodon spp. and Eremochloa ophiuroides material through quantitative data analysis and comparison of the 3 groups selected on material that suits the media light (670g), saturated moisture content (218%), low-cost ($1.1 USD). Planting Angelonia salicariifolia,Orthosiphon aristatus,Barleria repens material 17 group, through quantitative data analysis and comparison of the 3 groups selected of material that suits the media light (950g), saturated moisture content (241%), low-cost ($1.4 USD).

Abstract: With the rapid development of reinforced earth technology, different reinforced materials are also gradually applied to Reinforced earth. In this paper, we focus on the need for the study of interface characteristics between different reinforced materials and clay, by making indoor drawing test with two kinds of reinforced materials commonly used in engineering and the same clay. The test results show that: the drawing strength between the two reinforced materials and clay both increase with the normal stress increasing, both of their strength envelopes are straight lines; In the drawing test between the warp knitted geogrid and clay, the cohesive strength is 6.65kPa, the friction angle is 21.03°; while the drawing test between the geonet and clay, the cohesive strength is 2.9kPa, the friction angle is 10.96°; The average tensile strength of warp knitted geogrid is 26.4% of genet's, while the drawing strength of warp knitted geogrid in the test is about 48.1% of genet's, so when chosing reinforced materials in some engineerings, it is an important factor that we must consider the particle size and gradation of the filled reinforced materials, selecting the most appropriate size effect.