Gansu Construction Vocational Technical College

Lanzhou, China

Gansu Construction Vocational Technical College

Lanzhou, China
Time filter
Source Type

Wang C.,Lanzhou University of Technology | Lou X.,Xi'an University of Science and Technology | Xia T.,Lanzhou University of Technology | Tian S.,Gansu Construction Vocational Technical College
Ceramics International | Year: 2017

0.8(Bi0.5Na0.5)TiO3-0.2(Bi0.5K0.5)(HfxTi1-x)O3 (abbreviated as BNT-BKHxT1-x) lead-free ceramics are prepared using a solid state reaction method and their dielectric, field-induced strain and energy storage properties have been systemically investigated. It was found that the largest strain induced by an external electric field occurs for x=0.02. For the x=0.02 sample, S33=0.41%, Smax/Emax=683pm/V. However, the energy storage density is optimized at the x=0.03 sample, for which W1=0.51J/cm3. Those results may originate from the field-induced transition between a relaxor-ferroelectric mixture phase and a ferroelectric phase. © 2017 Elsevier Ltd and Techna Group S.r.l.

Wang X.L.,Gansu Construction Vocational Technical College | Wang X.L.,Gansu Jianyuan Architectural Design Institute Co. | Wang X.L.,Lanzhou University of Technology
Advanced Materials Research | Year: 2014

In this paper, with the help of the finite element software ADINA, an actual composite soil nailed wall was solved. The dynamic response of the composite soil nailed wall is analyzed and discussed under the EL-Centro and man-made Lanzhou accelerogram. And the variation principles of the soil nailed wall which subjected to the earthquake, and the earthquake coupled with pore pressure, are demonstrated respectively. The results of the FEM dynamic analysis can be a useful reference for engineers of the design and construction of the composite soil nailed wall. © (2014) Trans Tech Publications, Switzerland.

Bao W.,Gansu Construction Vocational Technical College | Wang F.,Gansu provincial communications industry engineering supervision Ltd
Applied Mechanics and Materials | Year: 2012

The challenge in civil engineering construction is first to design and then to build, the structure should be of less cost, architecture appearance and ecological sustainability. Take Guangzhou International Conference Center as a sample, analyze the design characteristics of the structure, and discuss the special construction technology on different structures. The results shows that the architecture is of great success from the technological point of view, the special shape and complex structure are unique comparing with other architectures, which assure the high quality and large-span apperance of the architecture. © (2012) Trans Tech Publications, Switzerland.

Hou X.,Gansu Construction Vocational Technical College | Yao Z.,Gansu Academy of science | Wang J.,Gansu Construction Vocational Technical College
ICTE 2015 - Proceedings of the 5th International Conference on Transportation Engineering | Year: 2015

In this paper, a comparison analysis using FEM calculation was carried out regarding three kinds of anti-slide pile, i.e. The common one, the box-Type reinforced concrete one and the box-Type one with vertical prestressed tendons, showing that the displacement and positive bending moment of the pile with vertical prestressed tendons are smaller than that of the rest ones under 2000 kN landslide thrust, with slight increases of negative bending moment on both ends, indicating that it has obvious advantages in resisting displacement and bending during landslide control; on this basis, the layout patterns of the prestressed tendons were optimized by comparing the 5 types of layout option, and negative bending moment and shearing force of the box-Type pile with vertical end-curve-Arrangement prestressed tendons were found to be smaller than that of the rest ones, while the maximum positive bending moment and positive shearing force on the sliding surface remaining the same, proving that it is more scientific, reasonable and appropriate for landslide control; a loading simulation was conducted, showing that the prestress shall be applied appropriately. Combined with the inherent structure characteristics and internal vertical end-curve-Arrangement prestressed tendons, the landslide stability is improved for box-Type pile. © ASCE.

Xu Z.Q.,Lanzhou Jiaotong University | Liu D.P.,Chang'an University | Wang J.,Gansu Construction Vocational Technical College
Applied Mechanics and Materials | Year: 2014

Subgrade stress under static vehicle load is different from that under moving load. In order to study the law of subgrade dynamic stress under moving vehicle load, the paper established the three-dimensional analysis model with finite element software and calculated the subgrade dynamic stress of different depth. It is concluded that subgrade dynamic stress decreases with the increase of depth and the smaller the depth is, the faster the degradation is. To a certain depth, subgrade dynamic stress changes a little. Meanwhile, the paper analyzed the effect of surface layer modulus and thickness, roadbase modulus and the thickness, subgrade modulus on subgrade dynamic stress. It is concluded that surface layer modulus and thickness have little effect on subgrade dynamic stress, subgrade dynamic stress decreases when roadbase modulus and the thickness increase, especially for the depth of the subgrade is relatively small. Subgrade dynamic stress increases with the increase of subgrade modulus. Increase trend is more obvious when the depth is small. © (2014) Trans Tech Publications, Switzerland.

Liu Y.L.,Gansu Construction Vocational Technical College
Advanced Materials Research | Year: 2014

Taking the deep foundation pit engineering of a Subway Station as background. The paper introduces the project's surroundings, geological and hydrological conditions of the proposed field and the retaining structural type. According to the engineering characteristics, the project was divided into four typical operating conditions, the deformation rules of deep foundation pit at subway station in tunneling are studied with the method of FLAC3D numerical simulation, the supporting structures choose by the bored piles and interior support. The analysis of the horizontal deformation of the retaining structures the settlement law and the influence sphere of surrounding soil. The conclusion in this paper can provides reference for the reasonable design and safety construction of deep foundation pit. © (2014) Trans Tech Publications, Switzerland.

Wang X.-L.,Lanzhou University of Technology | Wang X.-L.,Gansu Construction Vocational Technical College | Zhu Y.-P.,Lanzhou University of Technology
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2010

Based on the previous theories and experiments, the paper firstly analyzed the chemical mechanism and mechanical properties of lime piles. Then, the authors conducted a theoretical analysis of the effect of collapsible loess reinforced by the lime pile, determined the effective radius of expansion, the increase in expansion pressure and expansion volume of lime piles, and deduced the soil density of the lime piles and the soil density between lime piles in the process of expansion. Next, in the light of the expression of the density and porosity of composite foundation of the compacted lime piles, the load of the composite foundation was estimated. Finally, through project experiments, the changes of mechanical parameters of collapsible loess were measured and evaluated when expansion of lime piles is used to reinforce collapsible loess. The results show that lime compaction is cost-effective in reinforcing the foundation of collapsible loess.

Tao H.,Gansu Construction Vocational Technical College
Advanced Materials Research | Year: 2014

The paper introduces the application of prestressed anchors and soil nails support system in complex soil layer deep foundation pit engineering at Lanzhou region based on the deep foundation pit engineering in Gansu Provincial Hospital of TCM as the background and discusses its key technology. The effect shows that scheme of the design of foundation pit support engineering is reasonable and effective. The engineering meets requirements of design and environment. The monitoring results show that prestressed anchors can control the horizontal displacement and the change rate of slope′s vertical settlement effectively. The experience of engineering is significance for similar engineerings at Lanzhou region. © (2014) Trans Tech Publications, Switzerland.

Yang L.,Gansu Construction Vocational Technical College
Applied Mechanics and Materials | Year: 2011

Part of Xiping railway south cave temple bridge segments are on easement curve. considering the project time limit and construction difficulties of large span curved bridge, the construction team adopted 64m soffit scaffolding composite column structure to assemble the precasted box girder segments ,this method can better solve the technical problems of nonuniform stress distribution in transverse beam and upright tubes of the bracket. Therefore, this paper introduces in details the bracket structure as well as the key construction technologies of segmental beam rand bracket. the experience can provide good reference for similar engineering. © (2011) Trans Tech Publications.

Li J.H.,Gansu Construction Vocational Technical College
Advanced Materials Research | Year: 2011

For the loess cave characteristics, such as the thin coverage soil layer at the hole top, the poor self-stabilizing capacity, the large disturbance deformation after excavation and the easy collapse, thus in this paper, the loess cave safety factor is obtained by the method of strength reduction. And the stability calculation analysis is much more perfect. The Northwest Area Lishi loess cave is used in this paper, and the idea of strength reduction finite element method is applied, based on the Drucker-Prager yield criterion, the loess cave static stability analysis is made by the software of ANSYS.The results show that the actual situation can be reflected by the method of finite element strength subtraction. And the obtained loess cave stability coefficient is much closer to the actual steady state, thus showing the certain advantages of stability analysis.The method is also adopted in this paper. And its feasibility can be applied to the engineering practice, also a theoretical basis of reference is provided for engineering application. © (2011) Trans Tech Publications.

Loading Gansu Construction Vocational Technical College collaborators
Loading Gansu Construction Vocational Technical College collaborators