Applied Mechanics and Materials Vols. 166-169

Abstract: According to the actual field survey, the degree-day model of snow-melting speed is discussed, seepage force of ground water is considered and the geometrical model for stability analysis on the freeze thawing of frozen-soil side slopes. Using the effective stress approach deduces the stability coefficient when soil slopes is instable due to freeze thawing caused by disasters of ice and snow, various factors affecting security coefficient of side slopes are discussed and the stability of side slopes under different depths of snow is solved.

Abstract: Abstract. The effects of flow coefficients, working pressures and different spray distances on extinguishing cooking oil fires by water mist were studied by experiment. The results show that the fire suppression effectiveness is increased with the increase of flow coefficient and working pressure, spray distance also affects the fire extinguishment efficiency of water mist. Reasonable conditions and designing parameters for practical engineering application of water mist are suggested.

Abstract: There is an increasing need for more accurate information on the hazard and risk of flooding in local region. Besides the national-scale and regional-scale flood risk assessments, it is gradually developed with a focus on particular field-scale conditions in order to ensure that local conditions are taken into account in. On this basis, how to efficiently and effectively make use of the remote sensing monitoring products embedded with hydrological dynamics model is the critical issue for the field-scale flood disaster risk assessment. In this research, based on the established GIS database, it proposed a new combined assessment model, which integrating remote sensing products and SCS hydrological dynamics model to generate the weighted water level of inundated area for assessing the field-scale flood disaster in Hubei province. The major research methods and key technologies involved were discussed briefly. The example result reveals that combined remote sensing and hydrological dynamics field-scale risk assessment model conforms basically to the actual disaster data.

Abstract: The long, and larger subsea tunnel has rapidly developemented in recent years in the world. But it has much more high risk for its geological condition's complexity and uncertainty in the physical prospecting interpretation result. The collapse is one of the biggest construction risk in the long, and larger subsea tunnel project, which can easily lead to huge disaster and economic and life loss. The four-color(red, orange, yellow and green) early warning mechanism of geological hazards on collapse in subsea tunnel construction is stated in the paper. And the corresponding project preventive measures are also made according to different early warning ranks. The early warning mechanism and methods stated above have some guiding significance to similar projects.

Abstract: Abstract: This article summaries the importance of the technology of landslide monitoring, also describes main methods of landslide monitoring and new means of analysis of landslide deformation, at the same time, it briefly describes the classification of detection technology of landslide deformation and points out the prospect of engineering application of landslide monitoring technology.

Abstract: Relationship between bending solutions of functionally graded Timoshenko beams (FGMTB) and those of homogenous Euler-Bernoulli beams (HEBB) were studied in this presentation. The deflection and the rotational angle of FGMTB are expressed in terms of the deflection of the corresponding HEBB with the same geometry, loadings and end constraints. Consequently, solutions of bending of the FGMTB are simplified as the calculation of the transition coefficients which can be easily determined by the variation law of the gradient of the material properties and the geometry of the beams because the solutions of corresponding HEBB are well known. As examples, solutions for the FGM Timoshenko beams under S-S, C-C, C-F and C-S end constraints and subjected to arbitrary transverse loadings were presented. These analytical solutions can be as benchmarks in the further investigations of behaviors of FGM beams.

Abstract: In order to analyze the case of the spiral ribbed pre-stressed steel wire failure during pre-stretching, OM, SEM and EPMA was used to do the inspection and analysis of the fracture sample. The result show that the crack propagation during pre-stretching of the wire bring on the fracture, which is cased by the net carbide and phosphorus segregation in the center of the raw material 82B rod in the drawing process.

Abstract: This paper makes a study on the stress state and internal force algorithms of wall beams under the action of vertical load. It also makes a comparative analysis to several typical wall-beam designs at present. Then, by using the finite element, it verifies the accuracy and reliability of internal force algorithm formulas of wall beams in current Code for Design of Masonry Structure, hoping to provide a solid theoretical reference for the selection of wall beam algorithm designs.

Abstract: Considering thermal residual stress and initial matrix crack, the cylinder FEM analysis model for C/SiC tow was established. The cohesive element and damage criterions were introduced to simulation the initiation and propagation of interphase crack processes of C/SiC composites. The thermal residual stresses release with the initial matrix crack and the cracking on interphase. The interphase crack length was dominated by the performance of interphase. Analysis demonstrated that the CZM model can simulate well the thermal residual stress and the delamination of the interphase.

Abstract: Shear connectors are usually used to connect two different structural materials and to transfer longitudinal shear forces across the materials interface in composite structures. This paper presents an experimental study on the behavior of shear connectors in UHPFRC-NSC composite structure. A new experimental installation (The NSC block is laid on the supporting deck, and the higher UHPFRC block is cantilever, meanwhile the top side of the NSC block is constrained.) is applied. A modified formula that it is proposed to calculate the load carrying capacity of shear connector is given. The experimental results are in good agreement with the calculated results.