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检索条件"机构=MOE Key Lab. of Disaster Forecast and Control in Engineering"

共 87 条记录，以下是71-80 订阅

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Optimal sensor placement based on Tabu search algorithms

Optimal sensor placement based on Tabu search algorithms

引用

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...

引用

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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Research on Preparation of Concrete by Sea Sand

Research on Preparation of Concrete by Sea Sand

引用

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

Experimental investigations on mechanical properties and fir...

引用

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

Experimental Investigations on Mechanical Properties and Fir...

引用

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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A SI-based algorithm for structural damage detection

A SI-based algorithm for structural damage detection

引用

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 lab.ratory. 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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Out-of-plane compression and impact of woven textile sandwich composites

Out-of-plane compression and impact of woven textile sandwic...

引用

2012 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012

作者： Zhao, Long Fan, Hualin Huang, Shiqing PLA University of Science and Technology Nanjing China Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University Nanjing China State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing China MOE Key Lab. of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9780769547725

Woven textile sandwich composite (WTSC) is a light-weight structural material. The manufacturing method of WTSC was introduced in the paper. To reveal the quasi-static and the dynamic crushing behavior of WTSC, out-of-plane compression tests were carried out. Low-velocity impact experiments were carried out to investigate the anti-crush ability of WTSC. The results of the quasi-static and dynamic compression tests show that the woven textile sandwich material has good energy absorption ability. From the difference of the peak loads, it is concluded that the woven textiles have strain rate sensitivity. The intact woven textile sandwich panel and the destroyed one have different anti-crush abilities. Different methods are used to enhance the anti-penetrating of the intact woven textile sandwich panels, for example, increasing the content of the glass fibers, enlarging the diameter of the glass fibers and enlarging the height of front faces and the whole panel. From the experiments, it is concluded that WTSC has light weight, great specific strength and good energy absorption ability. WTSC is a promising light-weight structural material for vehicle bodies. © 2012 IEEE.

关键词： Honeycomb structures

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Out-of-plane Compression and Impact of Woven Textile Sandwich Composites

Out-of-plane Compression and Impact of Woven Textile Sandwic...

引用

第三届数字制造与自动化国际会议

作者： Long ZHAO Hualin FAN Shiqing HUANG PLA University of Science and Technology Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University State Key Laboratory of Automotive Safety and Energy Tsinghua University MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University

Woven textile sandwich composite （WTSC） is a light-weight structural material. The manufacturing method of WTSC was introduced in the paper. To reveal the quasi-static and the dynamic crushing behavior of WTSC, out-of-plane compression tests were carried out. Low-velocity impact experiments were carried out to investigate the anti-crush ability of WTSC. The results of the quasi-static and dynamic compression tests show that the woven textile sandwich material has good energy absorption ability. From the difference of the peak loads, it is concluded that the woven textiles have strain rate sensitivity. The intact woven textile sandwich panel and the destroyed one have different anti-crush abilities. Different methods are used to enhance the anti-penetrating of the intact woven textile sandwich panels, for example, increasing the content of the glass fibers, enlarging the diameter of the glass fibers and enlarging the height of front faces and the whole panel. From the experiments, it is concluded that WTSC has light weight, great specific strength and good energy absorption ability. WTSC is a promising light-weight structural material for vehicle bodies.

关键词： woven textile sandwich composite out-of-plane compression low-velocity impact

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Structural health monitoring based on continuous ACO method

Structural health monitoring based on continuous ACO method

引用

作者： Yu, Ling Xu, Peng MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China Department of Civil Engineering China Three Gorges University Yichang 443002 China

Structural damage detection remains as a challenging task in the field of structural health monitoring (SHM), which has occupied many scientific communities over the last two decades. As a new exploring attempt to the SHM problem, this paper proposes an ant colony optimization (ACO) based algorithm for continuous optimization problems on structural damage detection in the SHM field. First of all, the theoretical background of ACO is introduced for search of approximation best solution to discrete optimization problems and further to continuous optimization problems. Then four benchmark functions are used to evaluate the performance of continuous ACO (CnACO) algorithm. After that, the problem on the structural damage detection is mathematically converted into a constrained optimization problem, which is then hopefully solved by the CnACO algorithm. Meanwhile, effect of measurement noise on the algorithm is considered in all the damage scenarios. Upon extensive numerical simulations for single and multiple damages of a 2-storey rigid frame structure, the proposed method is extended to four damage patterns of a building model of 3-storey steel frame structure made in lab.ratory for further experimental verification of the proposed method. Illustrated results show that the proposed method is very effective for the structural damage detection. Regardless of weak damage or multiple damages, the identification accuracy is very high and the noise immunity is better, which shows that the proposed method is feasible and effective in the SHM field. © 2010 Elsevier Ltd. All rights reserved.

关键词： Ant colony optimization

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Dynamic analysis of non-uniform continuous girder bridge under moving vehicle

引用

1st International Conference on Civil engineering, Architecture and Building Materials, CEABM 2011

作者： Chen, Zhigang Peng, Zilin Key Lab. of Disaster Forecast and Control in Engineering Ministry of Education of the People's Republic of China Jinan University Guangzhou 51632 China Department of Mechanics and Civil Engineering Jinan University Guangzhou 51632 China

ISBN: (纸本)9783037851258

For non-uniform continuous bridge in actual projects, the theoretical analysis and field testing of the dynamic response under moving vehicle are carried out. Firstly, Euler-Lagrange equation is applied to derive the vibration equation of three-axle vehicle. Then one obtains the dynamic analysis model by using the finite element method and the vehicle-bridge interaction equation based on the displacement coordination relationship of the contact between wheels and bridge. Lastly, numerical solutions are presented according to the dynamic response of the bridge, compared with the real values. The results show that: the roadway roughness and vehicle speed strongly influence the impact factor. © (2011) Trans Tech Publications.

关键词： Dynamic response

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