Advanced Materials Research Vols. 250-253

Abstract: We report numerical simulations of the interactions between sea ice and the off-sea bridge pier by using the explicit dynamic analysis software ANSYS/LS-DYNA. The simulated propagation of cracks in ice, ice force, and bridge pier displacement response are consistent with both theoretical and field experimental results. We find that the displacement response is not sensitive to the variations of the ice velocity, while the ice force is approximately inverse linear proportional to the ice velocity.

Abstract: According to the limitation on applying the research achievement on regional rainstorm-induced road hazard into practice, formation mechanism and development patterns are analyzed and investigated deeply, then two stages on forming the rainstorm-induced road hazard are verified: ① The hydrodynamic action stage, including the rainstorm splash-wash erosion process and infiltration-seepage process; ② The hydrostatic action stage, including rainwater immersion-softening process. They are combined to establish a series interaction processes termed "splash-wash-infiltration-seepage-immersion-softening" to define the formation mechanism mode for the rainstorm-induced road hazard. full cut, full fill, cut and fill are considered to be the three typical failure patterns for the rainstorm-induced road hazard and all types are boiled down to "cumulative deformation failure → developing and catastrophe failure → hysteretic deformation failure" three failure process, in order to reflecting the occurring and evolving law for the rainstorm-induced road hazard, comprehensive and systematic analysis are implemented into every single failure mode and process. The study achievements indicate a new clue for approaching the formation mechanism and developing mode of rainstorm-induced road hazard, and are of value to disaster prevention and reduction in road engineering.

Abstract: The merits of recycled concrete aggregate used in cement-stabilized macadam have been demonstrated, and the influence of recycled concrete aggregate on strength and deformability of cement-stabilized macadam was studied, while the recycled aggregate was used as a replacement of equal gradation for original aggregate. The results show that the optimum moisture content of mixture was increased with the increment of recycled aggregate content within a certain range, but maximum dry density and drying shrinkage strain were decreased. The unconfined compressive strength was first increased and then decreased, and the splitting tensile strength was first increased and then gradually stabilized. Recycled aggregate with a reasonable content is beneficial for improving the pavement performance of cement-stabilized macadam.

Abstract: This paper provides a method to predict the strength of interior reinforced concrete beam-column joints that fail in shear before the plastic hinges occur at both ends of the adjacent beams. The proposed method takes into account the axial force ratio, the compressive strength of concrete, and the shear strength deterioration in the beam-column joints. In order to verify the shear strength of the proposed method, the behaviors of 38 interior beam-column joints were compared. Comparisons between the observed and calculated shear strengths of the tested beam-column assembles, showed reasonable agreement.

Abstract: “Las Aguzaderas” Castle is a beautiful example of Spanish military constructions. We wish a general methodology for the modelizacion and performance in this prototypical castle, to use for its application not only in him, but in other many existing ones which they respond to this same pattern, with great intertest. Stone blocks creating powerful walls, only perforated by little hollows (doors, arrow-windows, etc). The stone’s mechanical characteristics well are known. The simple form of the elements bases, make possible the profuse use of numerical methods, when working with discretitations of elements type “brick”. Others elements more complex (vaults, cupolas, abutments, doors, etc.) can easily also modelized and be discretized. The analysis that provides the indicated methodology to us, to find pathologies in this castle, with which we could make the Integral Rehabilitation Plan, in special with composites, armed with fibers (E glass, kevlar and carbon).

Abstract: The three parameters of the earthquake ground motions(peak amplitude, spectrum and duration) and dynamic elasto-plastic properties of the building structure can be considered in elasto-plastic history analysis method, therefore it is significant for seismic performance assessment, nonlinear development progress and failure mechanic analysis of building structures under different level earthquake. The accuracy and availability for constitutive model of concrete and reinforcement subjected to cyclic loading have an important influence on reliability of the elasto-plastic history analysis of building structure based on material model. However, due to the complexity of concrete material, there is no unified constitutive model can be used to analyze nonlinear mechanical behavior of concrete until now. In this paper, a practical uniaxial hysteretic constitutive model of concrete and reinforcement is proposed, a computer program of material model is developed and the model is inserted into ABAQUS software with the user subroutine, using fiber beam element model and explicit time integration method, a elasto-plastic history analysis for shaking table test model of 12-story reinforced concrete frame is carried out. The comparison between computation analysis and experimental results shows that the model has a higher accuracy, efficiency and better availability, it is suitable for the constitutive model of concrete and reinforcement used in elasto-plastic history analysis of building structure.

Abstract: removed due to plagiarism The original paper was published at: http://www.simulia.com/forms/world/pdf2008/WINKLER-AUC2008.pdf

Abstract: Through studying the bending fracture and cleavage fracture of the asphalt mixture within the different temperature condition, confirming that the temperature influences the microscopic mechanism of mixture cracking: the fracture is relatively flat with low temperture, the destruction of the asphalt mixture is also mainly result of the brittle fracture; As the temperature rise, fracture surface becomes coarse, some part show large plastic elapse deformation. Adding fiber can reduce thickness of the asphalt membrane, improve the bonding strength of asphalt mastic, and greatly increase the ratio of the aggregate fracture and interface zone fracture, so as to enhance the asphalt mixture crack-resistance. The fracture morphology of asphalt mixture has a better reflection for its mechanical characteristics.

Abstract: The types and characteristics of phase change energy storage materials were introduced ，and the current research of thermal storage with PCMS is summarized in the paper. Meanwhile the influence of stability, corrosion, phase segregation, sub-cooling, and encapsulation of phase change materials on heat storage were presented also. The applications and prospects of PCMS used in many fields were summarized in the end of the paper.

Abstract: This paper is an analysis of buttresses detection after a car crash, with acoustic detector and GRP. It is found no serious affection in the material property which is still of good flexibility. Through a finite element method, a jacking and repairing scheme to jack the single-column bridge of both sides together is chosen. Make use of the Carbon Fiber Reinforced Plastic in the basic crack for reinforcement.