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Two-dimensional analyses of delamination buckling of symmetrically cross-ply rectangular laminates

Applied Mathematics and Mechanics(English Edition) 2013年第5期34卷 597-612页

作者：薛江红罗庆姿韩峰刘人怀 Department of Mechanics and Civil Engineering Jinan University Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Beijing Institute of Technology State Key Laboratory of Explosion Science and Technology

The conventional approach to analysis the buckling of rectangular laminates containing an embedded delamination subjected to the in-plane loading is to simplify the laminate as a beam-plate from which the predicted buckling load decreases as the length of the laminate increases. Two-dimensional analyses are employed in this paper by extending the one-dimensional model to take into consideration of the influence of the delamination width on the buckling performance of the laminates. The laminate is simply supported containing a through width delamination. A new parameterβ defined as the ratio of delamination length to delamination width is introduced with an emphasis on the influence of the delamination size. It is found that （i） when the ratio β is greater than one snap-through buckling prevails, the buckling load is determined by the delamination size and depth only; （ii） as the ratio β continues to increase, the buckling load will approach to a constant value. Solutions are verified with the well established results and are found in good agreement with the latter.

关键词： two-dimensional analysis rectangular laminate delamination buckling laminate theory

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Experimental investigations on mechanical properties and fire resistance of steel-polypropylene hybrid fiber reinforced concrete

Experimental investigations on mechanical properties and fir...

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2013 International Conference on Future Energy and Materials Research, FEMR 2013

作者： Ouyang, Dong Kong, Lin Jie Fu, Hao Lu, Liu Lei Liao, Long Huang, Chen wu MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangdong 510632 China Center for Engineering Materials and Struture Durability Research Jinan University Guangdong 510632 China

ISBN: (纸本)9783037857892

This paper investigates the mechanical properties and the fire resistance of steel-polypropylene hybrid fiber-reinforced concrete. The type of the polypropylene fibers are polypropylene monofilament fiber, polypropylene fibrillated fiber, and macro polypropylene fiber, and the type of the steel fibers is hooked steel fiber. The experimental results show that the compressive strength, splitting tensile strength and flexural properties of steel-macro polypropylene hybrid fiber reinforced concrete are better than any others. And the fire resistance of steel-monofilament polypropylene hybrid fiber reinforced concrete is the best. © (2013) Trans Tech Publications, Switzerland.

关键词： Polypropylenes

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Numerical simulation of the oblique crack in the pipes using a chaotic oscillator based on ultrasonic guided wave

Numerical simulation of the oblique crack in the pipes using...

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20th International Congress on Sound and Vibration 2013, ICSV 2013

作者： Yang, Fei Jing, Lin Zhang, Weiwei Lin, Rong Ma, Hongwei College of Science and Engineering Jinan University Guangzhou 510632 China Impact Mechanics Laboratory Department of Mechanical Engineering National University of Singapore Singapore 117576 Singapore Department of Mechanics Taiyuan University of Science and Technology Taiyuan 030024 China Moe Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9781629931500

The ultrasonic longitudinal guided waves in oblique cracked pipes were investigated using finite element software LS-DYNA 3D in this paper. Based on the improved Duffing chaotic oscillator with substitution of (-x3+x5) for (-x+x3) of the non-linear restoring force item, a novel inspection method was proposed. Four kinds of defects with inclined angle of 15°, 30°, 45°and 90° were analyzed, respectively. Numerical results show that the proposed method could be used to inspect weaker guided waves, and the amplitude of echo increases with the decrease of the inclined angle. The results are worthy of engineering application in both extending guided waves detection range and increasing the sensitivity of detecting micro oblique crack.

关键词： Guided electromagnetic wave propagation

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Deformation of soft soils under constant stress ration consolidation with K0

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Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical engineering 2013年第SUPPL.2期35卷 798-803页

作者： Mo, Wei-Hong Chen, Xiao-Ping Luo, Qing-Zi College of Science and Engineering Jinan University Guangzhou 510632 China Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

The deformation and long-term deformation of soft soils are concerned both in academic and engineering fields, and they lead to the excessive settlement and post-construction settlement of soft layers. Based on one-dimensional consolidation principle, the tests on the constant stress ratio consolidation with K0, which is more actual consolidation state of soft foundation, are carried out to study the primary and secondary consolidation characteristics. The undisturbed samples used are obtained from a dredger fill foundation in Shantou of Guangdong province. By comparing with the K0 confined compression tests, it is noted that the instantaneous compression is significant in the tests on the constant stress ratio consolidation with K0, which affect the primary and secondary deformations. There are higher compression index, lower compression modulus and lower secondary consolidation coefficient than those in K0 confined compression tests, and the duration of the primary consolidation is shorter.

关键词： Consolidation

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Experimental Investigations on Mechanical Properties and Fire Resistance of Steel-polypropylene Hybrid Fiber Reinforced Concrete

Experimental Investigations on Mechanical Properties and Fir...

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2013 International Conference on Future Energy & Materials Research(FEMR 2013)

作者： Dong OUYANG Linjie KONG Hao FU Liulei LU Long LIAO Chenwu HUANG MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Center for Engineering Materials & Struture Durability Research Jinan University

关键词： Hybrid fiber Reinforced concrete Mechanical properties Fire resistance

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Structural damage detection using response phase space for beam-like structure under a moving load

Structural damage detection using response phase space for b...

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20th International Congress on Sound and Vibration 2013, ICSV 2013

作者： Nie, Zhenhua Jiang, Hui Ma, Hongwei College of Science and Engineering Jinan University Guangzhou Guangdong 510632 China Seismological Bureau of Guang Dong Province Guang Zhou Guang Dong China Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Guangzhou Guangdong 510632 China

ISBN: (纸本)9781629931500

Ideally, structural health monitoring of civil infrastructure consists of determining, by measured parameters, the location and severity of damage in the structure. Many structural Vibration parameters have been used to identify and quantify damage. Using parameters based on structural Vibration phase space features for damage detection is a new field in structural health monitoring. In this paper, a new damage detection method based on phase space of a single response is proposed. Firstly, the defmition of phase space of Vibration system is introduced. Then a new damage index named CPST (changes of phase space topology) based on topology changes of the phase space of Vibration signals under a moving load is introduced. The phase space of the dynamic response is constructed by the velocity and acceleration responses. The CPST values are calculated from the constructed phase space and used to identify structural damage. The main idea is that when the moving load passing by the damage location, the CPST curves have a singular point, which is used to locate the damage location. To demonstrate the method, the dynamic responses of a point on a beam-like structure are measured under different damage severity are used to calculate CPST for damage detection. The results indicate the CPST curves can successfully identify damage location and quantification. The proposed method is a good candidate for damage detection since only one sensor is needed.

关键词： Damage detection

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Analysis of reinforced slope based on interface properties of geosynthetics and soil

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Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical engineering 2013年第SUPPL.2期35卷 217-223页

作者： Liu, Dong Chen, Xiao-Ping Chang, Xue-Ning College of Science and Engineering Jinan University Guangzhou 510632 China Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China Guangdong Hydropower Planning and Design Institute Guangzhou 510170 China

As the geosynthetics are widely used in engineering practice to strengthen the slope stability, the interaction behaviors of geosynthetics and soil are very important for the slope stability analysis. A reinforced seawall constructed in coast reclamation project in Guangdong Province is analyzed. The interface friction properties of reinforcing materials and filling sand are studied by means of the laboratory shear tests and theoretical analyses, and the reinforcement mechanism is discussed. The numerical calculation is carried out on the stability and deformation behaviors of the reinforced slope under geostatic pressure. The test results show that the shear stress-shear displacement relationship of geosynthetics-soil interface is strain-harding. It is important for the stability of slope in soft foudation. In addition, the density of filling sand is the key factor for the frictional characteristics of interface. The stability analysis shows that the pavement method of reinforcing materials will directly affect the factor of safety of slope stability, and multilayer pavement effect is not a simple addition for every layer. Based on the circular slip surface method, the calculated factor of safety may be too small to reflect the contribution of geosynthetics, the strength reduction method is more reasonable for considering the interface friction. The finite element analysis also reveals that the effect of reinforcement on deformation behaviors of slope is mainly in the restriction to the magnitude of lateral deformation.

关键词： Shear stress

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GREEN QUASIFUNCTION METHOD FOR FREE VIBRATION OF CLAMPED THIN PLATES

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Acta Mechanica Solida Sinica 2012年第1期25卷 37-45页

作者： Shanqing Li Hong Yuan MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied MechanicsJinan UniversityGuangzhou 510632China

The Green quasifunction method is employed to solve the free vibration problem of clamped thin plates.A Green quasifunction is established by using the fundamental solution and boundary equation of the *** function satisfies the homogeneous boundary condition of the *** mode shape differential equation of the free vibration problem of clamped thin plates is reduced to Fredholm integral equation of the second kind by Green *** of the kernel of integral equation is overcome by choosing a suitable form of the normalized boundary *** examples demonstrate the validity of the present *** with both the series solution and ANSYS finite-element solution shows fine *** present method is a novel and effective mathematical one.

关键词： Green function integral equation R-function clamped thin plates free vibration

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A SI-based algorithm for structural damage detection

A SI-based algorithm for structural damage detection

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3rd International Conference on Swarm Intelligence, ICSI 2012

作者： Yu, Ling Xu, Peng Chen, Xi Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China MOE Key Lab. of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9783642309755

As a challenging task in the structural health monitoring (SHM) field, structural damage detection, one of most important issues of the SHM system, is mathematically converted into a constrained optimization problem, which is then hopefully solved by a swarm intelligence (SI) based algorithm proposed in this paper. The performance of the proposed algorithm is experimentally evaluated by the measured data of four damage patterns of a building model of 3-storey steel frame structure made in laboratory. Some illustrated results show that the proposed method is very suitable for the structural multi-damage identification, which also show that the SI-based algorithm for structural damage detection can provide an effective and robust tool in the SHM field. © 2012 Springer-Verlag.

关键词： Damage detection

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Experimental apparatus study on residual strength test of fine-grained soil containing coarse

Experimental apparatus study on residual strength test of fi...

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2012 International Conference on Civil engineering and Urban Planning, CEUP

作者： Liu, Dong Chen, Xiao-Ping Yin, Sai-Hua College of Science and Engineering Jinan University Guangzhou 510632 China Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9780784412435

Fine-grained soil containing coarse is widely distributed in the sliding zone of slop, its strength softening characteristics at large strains is different from normal clay. Special attentions are paid to residual strength of the soils for stability analysis of slop, and the most widely used shear strength test in engineering is by means of the direct shear test. However, if the soils contain a relatively high proportion of coarse particles, over 30%, it is difficult to reach a residual value by the conventional apparatus, because of the decrease in shear strength with increasing strain would at a relatively large shear displacement. The test suffers from grains overflow through the small clearance between shear-boxes and the shear plane does not remain the same. With consideration of the above disadvantages, a new type of apparatus had been developed in this paper. By controlling the tilt of the upper shear-box caused by the relative displacement of boxes under vertical force, the apparatus can meet the repeated direct shear condition at large strains. The shear apparatus has several advantages that vertical pressure applied to the specimen can be maintained, and the relatively friction between the boxes is unaltered, if required, the shear dilatation effect of specimen is freely. The experiment results demonstrated that the apparatus is applicable to the residual strength test of the fine-grained soil containing coarse. It is easy to hold the grains and maintain the only shear planes, and the shear stress-shear displacement curves obtained from the improved apparatus can reflect the strain softening characteristics well. The new apparatus have advantages of clear principle and simple structure. By simple disassembled, it can recover to the conventional direct shear apparatus. © 2012 ASCE.

关键词： Shear stress

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