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Su Q.,Lanzhou Jiaotong University | Su Q.,Shandong Urban Construction Vocational College | Wu Y.,Lanzhou Jiaotong University
Advanced Materials Research | Year: 2011

In this paper, the differential equations of box beams are established based on the principle of minimum potential energy and the variational method. The elastic stiffness matrix and geometric stiffness matrix considering shear lag and compression-flexure effects are induced in this paper. And a finite element program is developed. Then the influence of compression-flexure effects to shear lag effect of box beam is analyzed.


Zhang B.,Shandong University | Li S.-C.,Shandong University | Yang X.-Y.,Shandong Urban Construction Vocational College | Wang B.,China Construction Fifth Engineering Division Corporation | Li M.-T.,Shandong Jiaotong University
Meitan Xuebao/Journal of the China Coal Society | Year: 2012

The uniaxial compression mechanical properties and anchoring effect of jointed rock mass with different crack fillings were analyzed. The influences of different crack fillings on jointed rock mass mechanical properties and anchoring effect were studied through similar material pieces uniaxial compression testing and numerical computation. The research results show that in a certain extent the compressive strength peak values increase with the increment of crack fillings elastic modulus; the less the differences between crack filling elastic modulus and that of matrix material, the better the jointed rock mass post-peak plasticity properties; there are little influences affected by crack fillings on bolted jointed rock mass post-peak plasticity properties; the more the differences between crack filling elastic modulus and that of matrix material, the more rapidly the stresses decrease after peak; the tensile stress begins to appear along the loading direction when the elastic modulus of crack filling is less than that of matrix material, the tensile stress peak values and distribution areas increase with the decrease of crack filling elastic modulus.


Xie D.,Shandong Urban Construction Vocational College | Tang H.,Shandong University
Advanced Materials Research | Year: 2012

In recent years,most existing engineering structures which have approached their normal life span, such as concrete plate, concrete beam etc., Almost all of these architecture structures are subjected to damage due to external loads, initial design defect etc. Structural damage detection and assessment has been becoming a focus of increasing interest in civil engineering field. However,At present, the study on structural damage detection is still at initial stage and the adopted main approaches are theoretical analysis and numerical simulation, but physical models are scarce. This leads to the yielded theories and methods are not sufficiently applicable for practical engineering application. Aiming at this, this paper focuses on developing effective methods of using wavelet and neural networks to detect the damage of elastic thin plate due to their extensive applications in civil engineering. © (2012) Trans Tech Publications, Switzerland.


Zhang B.,Shandong University | Li S.-C.,Shandong University | Yang X.-Y.,Shandong Urban Construction Vocational College | Zhang D.-F.,Shandong University | And 3 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2012

The influences of cross-cracks on the jointed rock mass failure modes and mechanical properties were studied. The brittle jointed rock mass specimens with cross-cracks were simulated by similar material. There were 20 groups of jointed rock mass similar material specimens in which the angle between main crack and loading direction and the angle between main crack and secondary crack were taken as changing parameters. The specimens of jointed rock mass similar material were tested to obtain the influences of cross-cracks on jointed rock mass failure modes and mechanical properties. The test results show that when the angles between main crack and loading direction are 0° and 90°, the failure modes of specimens are mostly shear type failure propagating from the secondary crack; when the angles between main crack and loading direction are 30° and 45°, the failure modes of specimens are mostly shear type failure propagating from the main crack; when the main cracks are at same angle, the strength of most jointed rock mass similar material specimens with cross-cracks is higher than the strength of specimens with single crack; the post-peak stress-strain curve descending slopes of most jointed rock mass similar material specimens with cross-cracks are steeper than the slopes of specimens with single crack; the specimens have low strength when the angle between main crack and secondary crack is about 45°, and the specimens have high strength when the angles between main crack and secondary crack are about 30° or 90°.


Shen C.J.,Shandong Urban ConstructIon VocatIonal College | Gao C.L.,Shandong Jianzhu University | Song Y.M.,Shandong Jianzhu University
Applied Mechanics and Materials | Year: 2014

NumerIcal sImulatIon of aIr flow over urban areas Is an effectIve way to analyze and predIct the wInd envIronment. ThIs paper presents two dImensIonal computer model results concernIng the effects of buIldIngs and/or a hIll on the wInd flow. The RANS equatIons and RNG κ-ε turbulence model used In the sImulatIon are dIscretIzed by the fInIte volume method. The computatIonal solutIon Is based on a pressure correctIon algorIthm of the SIMPLE-type. The Inflow boundary condItIons are gIven by wInd tunnel experIment. In the presence of only a street canyon formed by two buIldIngs, the ambIent wInd Is accelerated and slIghtly curved at the roof level. When there exIst a hIll and a street canyon, the velocIty In the canyon Is affected by the upwInd hIll. Another sImulatIon model, whIch has a hIll and two street canyons, Is used for comparIson. There Is a lIttle dIfference In velocIty between a sIngle street canyon and two canyons In the presence of an upwInd hIll. © (2014) Trans Tech Publications, Switzerland.


Zheng J.,Shandong Urban Construction Vocational College
Computers and Mathematics with Applications | Year: 2011

A simple universal adaptive feedback controller is proposed for chaos control. In comparison with previous methods, the proposed scheme, which uses a single feedback gain and converges very fast, is suitable for application to a larger class of chaotic, hyperchaotic and nonhyperbolic chaotic systems. A sufficient condition for selecting the least feedback terms is given, and a numerical example using the Lorenz system verifies the correctness and effectiveness of the proposed approach. © 2010 Elsevier Ltd. All rights reserved.


Song Y.M.,Shandong Jianzhu University | Shen C.J.,Shandong Urban Construction Vocational College | Zhang A.S.,Shandong Jianzhu University
Applied Mechanics and Materials | Year: 2014

The choice of damage index and quantify of the performance goal is an important part of the theory of performance-based seismic design. This paper introduces research results of shear wall structure damage model at home and abroad, combined with the experimental study on the seismic behavior of shear wall structure at home and abroad, and discusses the application in practical engineering of the shear wall structure damage, puts forward the remains problem to be further in-depth study. © (2014) Trans Tech Publications, Switzerland.


Wang W.,Shandong University | Wang W.,Shandong Urban Construction Vocational College | Zhu W.,Shandong University | Zhang D.,Shandong University
Modern Tunnelling Technology | Year: 2015

In this paper, an existing discontinuous deformation analysis program was improved using the aspects of stepwise support and relevant convergence criterion. The stability of an underground cavern group with random joints in a large hydropower station was analyzed by the improved program, especially in terms of the effects of construction factors and the stepwise support, and it was verified by comparing the analyzed results with the measured ones. Through a comparison of the influence of various excavation sequences of the three caverns (main powerhouse, transformer chamber and tailrace surge chamber) on rock stability, an optimization was carried out for the support scheme based on the deduced depths of the failure zone and the displacements of key points, showing that the optimal excavation sequence is to excavate the main powerhouse and the tailrace surge chamber first and then the transformer chamber; the cable bolting may be additionally installed at key parts of the tailrace surge chamber to improve the stress state of the surrounding rock. ©, 2015, Editorial Office of "Modern Tunnelling Technology". All right reserved.


Wu Y.,Shandong Jianzhu University | Xun J.,Shandong Urban Construction Vocational College | Jiang Z.,Shandong Jianzhu University
Proceedings of the International Conference on Uncertainty Reasoning and Knowledge Engineering, URKE 2011 | Year: 2011

Electronic Bidding System (EBS) is a hotspot in academic field. Studied EBS and its development, analyzed the necessity for researching on EBS, an integrated EBS based on AI and J2EE is proposed. Finally, the plan to design and implement the system is expounded. © 2011 IEEE.


Cui X.,Shandong Urban Construction Vocational College | Zhang Z.,Shandong Urban Construction Vocational College | Sun L.,Shandong Urban Construction Vocational College
Proceedings of the International Conference on e-Learning 2015, E-LEARNING 2015 - Part of the Multi Conference on Computer Science and Information Systems 2015 | Year: 2015

Higher Vocational Education is one of the most important educational forms. But in the course of implementation of Higher Vocational Education, we find three inevitable questions: Higher Vocational Educational system's length of schooling which is only three years is too short; the differences in personality of teachers affect the teaching effects; the lower quality of the students disengaged their passion to learn. MOOC is a new teaching mode which has successful cases such as a university computer course: a Computational Thinking Perspective of Shandong University. We refer to the university MOOC - a Computational Thinking Perspective, to construct a professional SPOC teaching mode and recur to the University MOOC in the process of teaching. Seen from the evaluation and suggests of teachers and students joined the MOOC and SPOC, the teaching mode not only can stimulate the teachers' teaching enthusiasm, but also can stimulate the students' learning enthusiasm. ©2015

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