Advanced Materials Research Vols. 602-604

Abstract: The films were deposited on glass slide substrates by DC magnetron sputtering method by using a ZnO target doped with Ga2O3 of 3wt%, then annealing processing were implemented respectively under the temperature of 250 °C with the time of 0,30,60,90 and 120 minutes.Effects of sputtering on the structural and optical and electrical properties of GZO films had been investigated. The results showed that GZO films with high quality could be fabricated after vacuum-annealed. crystal face of GZO films had a good tendency of c axis. the (002) diffraction peak reached a maximum at the annealing time of 1.5 hours; at the same time ,crystal grain became larger and crystal boundaries narrow, film’s resident stress reduced to 0.5 Mpa.With the annealing time increasing, the resistivity of GZO films decreased and reached the minimum which was 9.1×10^-4 Ω·cm at 1.5 hours. While the average transmittance decreased sharply after the time of 1.5 hours in visible region. Consequently, the best annealing time is 1.5 hours.

Abstract: In this work, the properties of LDPE were modified by SiO2-EVA (Ethylene Vinyl Acetate copolymer) composite, while EVA contributed to prevent nanometer SiO2 particles from conglomerating. The results show that the polarity of nano-modified PE films increase from 30 dyne/cm to 35 dyne/cm, the friction coefficient drop 1/2 by itself, and the surface resistance decrease 2~3 magnitudes compared with the un-modified. Also, the crystallization of the films and the crystal particles increase effectively due to addition of nano-SiO2. Hence, the thermal stabilization and elastic modulus of the films can be enhanced, so as to improve the comprehensive properties and reduce existed problems of PE films in applications of printing and packaging industry.

Abstract: The relationship between the energy dissipation and the damping force is studied through experimental and analytical research of the effect of laminar flow of viscous damper, and a linear viscous damper model and the calculation formulas are obtained.The results show that the linear flow model is the key factor to get a linear relationship between speeds and damping force.

Abstract: Five kind of Fe-12.8Cr alloys with different silicon content which were respectively 0%, 0.2%, 0.5%, 0.9% and 1.2% were experimentally made, and the microstructure and damping capacity of the alloys in quenched were studied. Explains the effect of the silicon content on Fe-Cr alloy damping performance, the results shows that the silicon content affects obviously on damping properties of Fe-12.8Cr two element alloy, Fe-12.8Cr two element alloy can be with better damping properties when the silicon content is about 0.6%.The domain area and domain interface mobile ability affect on the damping performance of Fe-Cr two element alloy, which ensure the appropriate grain size to increase the domain area and improve the magnetic domain wall moving ability can improve the damping properties of Fe-Cr based alloy.

Abstract: Stone column reinforced composite foundation of highway under static and seismic load is simulated by numerical method. Fist, calculation model was built up, and verified by in situ test. Then the whole construction process of highway stone column reinforced composite foundation is simulated, after 3 years of traffic load, a seismic load was imposed on bottom of the model. Calculation result show that: in construction and run time period, drainage effect of stone column is significant, when pile length reached to 12m, maximum pore pressure in middle of stone column reduced to about 4 kPa, when pile length reached to 10m, effect of pile length on settlement is small; composite foundation has smaller maximum horizontal displacement in stone column; surface and toe of embankment slope is apt to liquefy under seismic load, stone column can eliminate liquefaction potential to a certain extent, especially in composite foundation range.

Abstract: Liquefaction properties of large diameter long pile in medium dense sand under earthquake was investigated based on finite difference method. Dynamic property of foundation soil was modeled with equivalent linear model, three peak acceleration of 0.2g, 0.15g and 0.1g was studied. Numerical calculation results show that: peak acceleration affects large pore pressure zone and maximum pore pressure, when peak acceleration increase from 0.1g to 0.2g, large pore pressure zone moved from middle to bottom of pile, maximum pore pressure raised from 45 kPa to 350 kPa; liquefaction zone of foundation has a heart shape, and expanded with increase of peak acceleration, peak acceleration increase from 0.1g to 0.2g, depth of liquefaction zone bottom increase from 27% to 41% pile length, width of liquefaction zone increase from 34% to 41% pile length, peak acceleration reached to 0.2g, liquefaction zone extended to ground surface.

Abstract: A theoretical analyzing approach about a novel tuned mass damper system, FPS-TMD, was derived according to Lagrange Equation. The solution was presented with Newmark-β method and was programmed with MTALAB software. Computation results show that the maximum storey drift, inter-storey drift, storey velocity and acceleration were significantly decreased with FPS-TMD system. The slide radius, slip friction coefficient and the tuned mass will exert rather large influence upon the efficiency of seismic mitigation and energy dissipation. The system will exhibit the best efficiency with the slide radius being 0.8m, the slip friction factor being 0.4, and the tuned mass M/m=0.5.

Abstract: A theoretical analyzing approach about the compound floor isolation system consisting of FPS and dish spring is derived. It starts from the Lagrange equation, with the coupling effect of the horizontal vibration and vertical vibration being included. Computation results show that for the proper specifications the floor isolation system may exhibit good effectiveness in mitigating the acceleration of the unfixed objects or equipments in both horizontal and vertical direction, while the extra displacement could be limited to be in a manageable range. The expected parameters for mitigating the accelerations agree with that for displacements in a partial domain. The specification of a floor isolation system needs low friction coefficient on the slide 0.05<μ<0.1, a reasonable slide radius 0.5<μ<1.0m, a relatively low stiffness coefficient and relatively high damp coefficient of the dish spring.

Abstract: In this paper we have analyzed the influence of the strain hardening behavior of High Damping Rubber Bearings (HDRBs) adopted for a base isolation system of a Reinforced Concrete (RC) isolated structure. For the modeling of the rubber isolators we have adopted an evolution of the Bouc-Wen’s hysteretic model taking into account the incremental hardening effect which appears when the shear strain of the HDRB exceeds the limit value around 100% usually adopted in design practice. The incremental hardening effect is sometimes neglected in the design but it is an important aspect because it ensures a seismic protection of the base isolated structure also in presence of exceptional seismic events for intensity or frequency content. In this paper we have highlighted the significant influence of this phenomenon in the seismic response of the isolated structure by reporting the cyclic behavior of a HDRB respectively neglecting and considering this aspect.

Abstract: The present work deals with the evaluation of the level of seismic vulnerability of reinforced concrete existing buildings situated in high seismic zone and designed for only gravitational loads. For assessing seismic performance, a Displacement Based Approach (DBA) is adopted and in particular the N2-metohd is used, according to Italian seismic code NTC 2008. The effect of the masonry infills on the seismic response of the structure is considered and a nonlinear model is adopted for all the panels considered in effective interaction with the frame structure. It is shown that the effect of the masonry infills, if improperly located within the building, can give rise to a worsening of the seismic performance of the structure. In fact particular locations of the masonry infills within the building can give rise to a fragile structural behavior due to a collapse mechanism of soft storey. A comparative analysis of a building is performed by considering the effects of the masonry infills and by considering the bare structural frame and it is shown that fragile collapse mechanisms can occur depending on the location of the effective masonry infills within the building. Consequently it is discussed how in a vulnerability analysis the procedure of neglecting the masonry infills not always is a procedure which operates for the benefit of security.