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第十五届全国非线性振动暨第十二届全国非线性动力学和运动稳定性学术会议

作者：李媛萍 CHEN Si-yu Key Lab of Disaster Forecast and Control in Engineering Ministry of Education of the People's Republic of China(Jinan University) Department of Mechanics and Civil Engineering Jinan University State Key Laboratory of High Performance Complex Manufacturing Central South University

Vibration and noise are important engineering problem and many methods have been developed to control and/or absorb the *** to now,there are a number of strategies to control the response of a system such as passive control,active control,semi-active control and hybrid *** achieve perfect performance of target system,the structures or mechanical systems should be designed to suit for different types of loading such as particularly dynamic and transient loads,and to obtain high static stiffness resulting in a small static deflection and a small dynamic stiffness resulting in a low natural *** mainaim of this paper is to improve the nonlinear pendulum system with negative stiffness suspension element with external excitation,and to explore the bifurcation and chaos characteristics contained in the pendulum *** governing equations of pendulum are derived by Lagrange *** analyze the bifurcation of nonlinear response of pendulum system,the phase portrait and bifurcation diagram are obtained ***,the Floquet multipliers are obtained by solving the perturbation equation with original equation with numerical *** results show that the main responses of pendulum system are periodic,and through saddle node bifurcation the system come into chaotic *** parametric resonance may occur when the excitation frequency closed to the natural frequency at vertical direction of whole *** variation of stiffness and excitation frequency has a large influence on the performance of the pendulum,and the amplitude of excitation may deduce unbounded motion in the resonance region.

关键词： Pendulum Bifurcation Floquet multiplier chaotic motion Suspension

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Optimal sensor placement based on Tabu search algorithms

Optimal sensor placement based on Tabu search algorithms

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4th International Conference on Civil engineering, Architecture and Building Materials, CEABM 2014

作者： Zhan, Jie Zi Yu, Ling 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)9783038351641

In this study, the Tabu search (TS) algorithm is introduced into the optimal sensor placement (OSP) problem in the field of the structural health monitoring and moving force identification. A TS-based OSP procedure is proposed and further evaluated by some numerical simulations on a 2D planar truss model. The mean values of off-diagonal elements in a modal assurance criterion (MAC) matrix are used as the optimization objective function. Based on the criteria of MAC, determinant of fisher matrix, matrix condition number, and the least mean square error, the TS-based OSP procedure is evaluated through comparing with ones due to both of the energy coefficient-effective independence (ECEFI) and the effective independence (EFI) algorithms. The results show that the proposed TS-based OSP procedure is feasible with a higher accuracy. © (2014) Trans Tech Publications, Switzerland.

关键词： Structural health monitoring

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A two step damage prognosis method for beam-like truss structures

A two step damage prognosis method for beam-like truss struc...

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4th International Conference on Civil engineering, Architecture and Building Materials, CEABM 2014

作者： Jia, Hao Kai Yu, Ling 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)9783038351641

In this study, a two step damage prognosis method is proposed for beam-like truss structures via combining modal curvature change (MCC) with modal strain energy change ratio (MSECR). Changes in the modal curvature and the elemental strain energy are selected as the indicator of damage prognosis. Different damage elements with different damage degrees are simulated. In the first step, the finite element method is used to model a beam-like truss structure and the displacement modes are got. The damage region is estimated by the MCC of top and bottom chords of a beam-like truss structure. In the second step, the elemental MSECR in the damage region is calculated and the maximum MSECR element is deemed as the damage element. The simulation results show that this method can accurately locate the damage in the beam-like truss structure. © (2014) Trans Tech Publications, Switzerland.

关键词： Strain energy

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Strong motion records of two suspension bridges in a M4.8 earthquake

Strong motion records of two suspension bridges in a M4.8 ea...

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2014 GeoShanghai International Congress: Advances in Soil Dynamics and Foundation engineering

作者： Wang, Lixin Jiang, Hui Zhao, Xianren Li, Xueyan CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Earthquake Administration of Guangdong Province Guangzhou 510070 China Key Laboratory of Disaster Forecast and Control in Engineering Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China

ISBN: (纸本)9780784413425

Earthquake records of in-service, long-span bridges provide valuable insights into their seismic behavior and performance. In this paper, the strong motion records of arrays installed at two steel suspension bridges in a M4.8 earthquake are illustrated and preliminarily analyzed. The data reveal that the differences in the arrival times of peaks and valleys appear to be significant, which clearly illustrates the wave propagation effect. It is also shown that the differences in local soil conditions at different towers have significant influence on the spectra and time history of ground motions. The results suggest that the spatial variation of seismic ground motions induced by local site effect should receive more attention in seismic design and analysis of long-span bridges. © 2014 American Society of Civil Engineers.

关键词： Suspension bridges

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Sensitivity analysis of continuous curved bridge under different curvature radius

Sensitivity analysis of continuous curved bridge under diffe...

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4th International Conference on Civil engineering, Architecture and Building Materials, CEABM 2014

作者： Luo, Mu-Xin Gao, Jing-Hong Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Guangzhou 510632 China

ISBN: (纸本)9783038351672

In the condition of the same span, to change the continuous curved bridge's curvature radius and under the dead load and moving load to compare how the internal force changes in different curvature radius. The finite element model is established to simulate the actual structure by Midas Civil. Results in a continuous curved bridge which main span of less than 60m, under the dead load, bending moment(-y) is unlikely to change, reinforced by a straight bridge can meet the requirements;under the moving loads, the curvature radius of the bending moment (-y) has little influence, should focus on increase in torque and bending moment(-z). © (2014) Trans Tech Publications, Switzerland.

关键词： Sensitivity analysis

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The changes of internal forces and the reliability of curved bridge taking the cross-sectional design of axial symmetrical

The changes of internal forces and the reliability of curved...

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4th International Conference on Civil engineering, Architecture and Building Materials, CEABM 2014

作者： Zhao, Zheng Jiu Gao, Jing Hong Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Guangzhou 510632 China

ISBN: (纸本)9783038351672

Taking a bridge of 160m long variable cross-section prestressed continuous curved box-girder as the research object and analyzing the cross-sectional design of axis with axial symmetrical or axial non-symmetrical to research the structure forces change of the upper part of bridge in different curvature. In order to test and verify the variable cross-section of prestressed continuous curved box-girder bridge is safe and reliable via cross-sectional design with axial symmetrical instead of axial non-symtrical within a radius of curvature of the interval. Creating the straight bridge and curved bridge models with different radius of curvature in same span by Midas/Civil to compare their structure forces. © (2014) Trans Tech Publications, Switzerland.

关键词： Box girder bridges

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Fiber pullout with stress transfer and fracture propagation

Fiber pullout with stress transfer and fracture propagation

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2014 International Conference on Industrial,Mechanical and Manufacturing Science(ICIMMS 2014)

作者： J.Y.Wu H.Yuan H.W.Gu MOE Key Laboratory of Disaster Forecast and Control in Engineering Institute of Applied MechanicsJinan University

In this paper,a nonlinear fracture mechanics approach has been introduced to derive theoretical solutions for the shear stress transfer and crack propagation along the interface of the pull-pull and pull-push fiber-matrix pullout model by using the assumed bilinear local bond-slip *** for the maximum load,shear stress and crack propagation along fiber-matrix interface are derived ***,numerical simulations are conducted to discuss the factors influencing the interfacial *** this paper emphasizes on fiber-matrix pullout test,the analytical solution is equally applicable to similar test between spindly bars of other materials and concrete.

关键词： crack propagation FRP interfacial mechanics fracture mechanics

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Damage identification of the arch bridge based on the difference of deflection with moving load

Damage identification of the arch bridge based on the differ...

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4th International Conference on Civil engineering, Architecture and Building Materials, CEABM 2014

作者： Zhao, Zhan Nie, Zhen Hua Ma, Hong Wei College of Science and Engineering Jinan University Guang Zhou Guang Dong China The Key Laboratory of Disaster Forecast and Control in Engineering Ministry of Education of China Guangzhou Guangdong China

ISBN: (纸本)9783038351641

A newdamage identificationmethodfor arch bridge structures under a moving load based on the difference of deflection is presented. The function ofthe deflection atthe midspanof thearch with the changing positions of the moving load is derived using the Moore integralmethod. It can be concluded from the results that when the moving load is in the areawithout damage,this target indicates to be linear functions with the cosine of an angle(θ) between moving load and horizontal. Nevertheless, this target is multinomial with the change of cos θin the damage *** order to validate the proposed damage detection algorithm, a steel arch modal issimulated, which is proved to be practicable in *** results indicate that the location and degreeof single damage can be identified accurately. © (2014) Trans Tech Publications, Switzerland.

关键词： Arch bridges

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Experimental study on secondary consolidation of soft dredger fill

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Tumu Gongcheng Xuebao/China Civil engineering Journal 2015年 48卷 257-261页

作者： Luo, Qingzi Wei, Xiaoyi Liu, Quanming Chen, Xiaoping College of Science and Engineering Jinan University Guangzhou510632 China Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China Guangxi University of Finance and Economics Nanning530003 China

A series of oedometer tests were carried out to investigate the secondary consolidation coefficient of soft dredger fill in the estuary of eastern Shantou. The test results show that the secondary consolidation coefficient decreases with the decrease of void rate or the growth of consolidation time. When certain lateral deformation is allowed, the secondary consolidation coefficient is higher, and preloading can eliminate part of the post-construction settlement. The secondary consolidation coefficient increases with the consolidation pressure. Once the consolidation pressure reaches the value of 2.3 times pc, the growth rate of secondary consolidation coefficient is very small, and the secondary consolidation coefficient is no longer dependent on consolidation load. The development trend of the secondary consolidation coefficient and compression index is consistent with different constraint and loading conditions, and a good linear relationship between them is found, where Cα/Cc≈0.028~0.049. ©, 2015, Editorial Office of China Civil engineering Journal. All right reserved.

关键词： Dredging

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Research on Preparation of Concrete by Sea Sand

Research on Preparation of Concrete by Sea Sand

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2012 2nd International Conference on Smart Materials and Nanotechnology in engineering(SMNE 2012)

作者： Dong OuYang Xiaowei OuYang Bo Ning Xilian Wen Yanli Lin MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Materials Science and Engineering Jinan University Guangzhou Residential Construction Development CO. LTD

The effects of fine aggregates on the performance of cement mortar was studied, and using sea sand as fine aggregates to prepared high-performance concrete, relative experimental studies on the workability, mechanical properties and durability are respectively carried outThe results showed that the compressive strength of cement mortar made by sea sand is smaller than river sand, but higher than river sand on flexural strengthThe workability,28 d compressive strength and splitting tensile strength of concrete made by sea sand are excellent than river sand, and the rate of early strength developed rapidlyThe resistance to penetration of chloride ions into sea sand concrete tested by ASTM C1202 and NEL, have reached a evaluation standard of "very low".

关键词： Sea sand High-performance concrete Mechanical properties Durability

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