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

作者： Huang, Xiao Zhu, Hongping Hu, Zhixiang School of Civil Engineering and Mechanics Huazhong University of Science and Technology LuoYu Road Wu Han 430074 China Hubei Key Laboratory of Control Structure Wuhan 430074 China

ISBN: (纸本)9783037851258

A modified Hertz model with nonlinear damping (Hertz damp model) is proposed for capturing the seismic pounding response of adjacent structures. Relevant parameters in the model are theoretically derived and numerically verified. Then, this model is used to simulate pounding response of a base-isolated highway bridge subjected to near fault ground motions. At the same time, nonlinear viscous dampers are installed between bridge decks for pounding prevention. The appropriate damping coefficient of the dampers can be found by parametric studies. It is shown that nonlinear viscous dampers are effective in reducing the relative displacement between bridge decks. At last, the hysteresis curve, the maximal damper force and stroke are used to demonstrate the behavior of nonlinear viscous dampers. The results indicate that satisfied viscous dampers can be produced to eliminate pounding according to the current manufacturing skills. © (2011) Trans Tech Publications.

关键词： Damping

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Research on initial form-finding and galloping of ice-coated transmission conductors

Research on initial form-finding and galloping of ice-coated...

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2010 International Conference on Computer and Communication Technologies in Agriculture Engineering, CCTAE 2010

作者： Cao, Huajin Li, Li Chen, Yuankun Xia, Zhengchun School of Civil Engineering and Mechanics Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan Hubei Province China China Railway Siyuan Survey and Design Group Co. Ltd. Wuhan Hubei Province China

ISBN: (纸本)9781424469451

A high efficiency simplified finite element analysis method is presented to analyze the iced galloping, which is characterized by large amplitude vibrations of iced, multi-span, electrical transmission conductors. Based on ANSYS/LS-DYNA, the springs-transmission conductors model was established that springs were used to copy the actions of tower to transmission conductors, the Mixed form-finding method is presented and which take the initial form of fixing wires and icing load into count, numerical wind tunnel technology based on CFD numerical simulation is used to study the aerodynamic characteristics of the ice-coated conductor. A simplified galloping analysis method of multi-span transmission conductors was proposed and verified. Based on the 1000kV Han River long-span power transmission tower line project, simplified calculation of transmission conductors galloping was performed. © 2010 IEEE.

关键词： Finite element method

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3-D Lightning Location Solution and Precision Analysis of Cloud Flash

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Wuhan University Journal of Natural Sciences 2009年第3期14卷 241-244页

作者： ZHANG Ping1,2, ZHAO Wenguang2,3?, HU Zhixiang2,3, WEN Yinping2,3 1. School of Architecture and Urban Planning, Huazhong University of Science and Technology, Wuhan 430074, hubei, China 2. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, hubei, China 3. hubei key laboratory of control structure, Huazhong University of Science and Technology, Wuhan 430074, hubei, China School of Architecture and Urban Planning Huazhong University of Science and Technology Wuhan 430074 Hubei China School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 Hubei China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan 430074 Hubei China

Using the spatial coordinates of detection stations and the time of arrival of lightning wave, the observation equations can be expressed. For the large lightning detection network, the least square method is used to process the adjustment of observation data to find the most probable value of lightning position, and the result is assessed by the mean error and dilution of precision. Lightning location precision is affected by figure factor. The conclusion can be used in the design of location network, data processing, and data analysis.

关键词： 3-D lightning location cloud flash detection solution model dilution of precision figure factor

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Damage detection on the joint of steel frame through high-frequency admittance signals

Damage detection on the joint of steel frame through high-fr...

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International Conference on Experimental Mechanics 2008, ICEM 2008

作者： Wang, Dansheng Zhu, Hongping Zhou, Huaqiang Yang, Haiping School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China Huazhong University of Science and Technology Hubei Key laboratory of Control Structure Wuhan 430074 China

The basic idea of a piezoelectric admittance (reciprocal of impedance) technique for structural health monitoring is presented in this paper. An experimental study on damage detection of a steel frame structure is operated by the use of the high-frequency piezoelectric admittance signals. In this experiment, three PZT active sensors are bonded to three different components around a joint of the steel frame separately, and the looseness of bolts is identified by monitoring the variations of piezoelectric admittance measurements. From the experimental results it is found that the PZT active sensors hold the ability to detect structural local damage, i.e. they are insensitive to the damage in far fields. Subsequently, two damage indexes, the covariance and the cross correlation coefficient between two real admittance data sets are defined respectively, by which the extent of damage of the frame structure is evaluated. It is found that the cross correlation coefficient index can correctly reflect the damage extent of the frame structure qualitatively in different frequency ranges, but the covariance index can not. © 2009 SPIE.

关键词： Damage detection

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The dynamic analysis of beams under distributed loads using Laplace-based spectral element method

The dynamic analysis of beams under distributed loads using ...

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2009 International Conference on Information Engineering and Computer Science, ICIECS 2009

作者： Zhang, Junbing Zhu, Hongping Wang, Dansheng School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781424449941

The finite element method (FEM) is certainly one of the most popular methods used for structural analysis. However, it is well known that a sufficiently large number of finite elements are necessary in order to obtain reliable structural dynamic responses owing to their high flexibility and large size, especially at high frequency. Since the shape functions of the spectral element method (SEM) are exact solutions of the governing differential equations of structures, the number of elements is significantly decreased. Unfortunately, conventional SEM can only be applied to structures subjected to concentrated loads. This paper presents the dynamic analysis of beams under distributed loads using Laplace-based SEM. Distributed loads are equivalent to concentrated nodal forces based on the principle of linear superposition. A continuous Bernoulli-Euler beam subjected to uniform vertical dynamic distributed load is analyzed here to show the effect of SEM. Both internal viscoelastic damping and external viscous damping are considered in this paper. The numerical results obtained from SEM are compared with those from FEM. It has been found that the SEM provides good dynamic results under distributed loads. The SEM has been proved to be an efficient method to analyze the dynamic responses of structures while the number of elements can greatly decrease. ©2009 IEEE.

关键词： Finite element method

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Empirical study in assessment of safety climate in construction site

Empirical study in assessment of safety climate in construct...

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2013 IEEE International Conference on Business Innovation and Technology Management Conference

作者： Weiqing Wei Siwen Zeng Sheng Xu Ling Ma Hanbing Luo Hubei Key Laboratory of Control Structure Huazhong University of Science ＆ Technology

With the rate of safety accidents during the engineering construction becoming higher and higher, more and more attention was paid on engineering safety. To better cognize the present safety situation of engineering construction without which prevention are hard to develop, this paper developed 2 surveys which aims at evaluating the present safety situation of a series of construction dominated by urban construction bureau of Dong’guan city in Guangdong province. Based on so many existing papers, safety climate is the most important impaction of safety accidents, furthermore, safety altitude reflect safety climate to a great extent, thus the first survey is developed to testify the conclusion. Based on the conclusion, another survey is developed to evaluate safety situation in Dong’guan city.

关键词： safety climate construction safety accidents

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Failure behavior of axially loaded tubular Y-joints under fire

Failure behavior of axially loaded tubular Y-joints under fi...

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作者： Fei, Gao Hong-Ping, Zhu Xiang-Nan, Liu School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan 430074 China

The failure behavior of axially loaded circular hollow section (CHS) tubular Y-joints under fire is investigated. As the plastic yielding at the intersection of the chord and the brace is the most possible failure mode, the yield line theory is adopted to evaluate the joint ultimate capacity. A commercial finite element (FE) package ABAQUS is used to simulate the joint behavior. A sequentially coupled thermal-stress analysis is activated to analyze the stresses of the joint at higher temperatures. The FE model of the joint has been verified against the experimental results of the CHS tubular T-joints under fire. The numerical analysis showed that the joint failed at the location of the intersection between the chord and the brace. The type of failure modes is dependent upon the geometric parameters (θ, β and γ) and the load ratios (n) of the joint. The critical temperature and the fire resistance limit of the joint under various brace loads are also investigated. It is found that the axial reaction of the chord due to thermal expansion of steel material is greatly larger than that caused by applied load, which seriously affects the fire resistance of the joint.

关键词： Failure modes

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Numerical study of structure health monitoring using surface-bonded and embedded PZT transducers

Numerical study of structure health monitoring using surface...

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2010 International Conference on Mechanic Automation and control Engineering, MACE2010

作者： Yu, Jing Zhu, Hongping Huang, Minshui School of Civil Engineering and Mechanics Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan China Transportation Research Center Wuhan Institute of Technology Wuhan China

ISBN: (纸本)9781424477388

Piezoelectric ceramic (PZT) transducers, which can be surface-mounted on or embedded in structures, are widely used for structural health monitoring. Since they are only sensitive to cracks nearby, the use of ones pasted on structures' surfaces may not be able to detect accurately the deep damages especially in large size structures. Therefore, the embedded PZT transducers display more advantages. Based on the electro-mechanical impedance (EMI) method, a simulation analysis of the finite element coupling models of the PZT transducers and body structures was made for structural damage detection. The effects of damage diagnoses using the surface-bonded and embedded PZT transducers are compared by the damage index under different conditions, including structures undamaged, damaged in different locations and extents. The results show that the proposed method of using embedded PZT transducers are more effective in identifying cracks in large-sized concrete structures and have great potential in structure health monitoring field. ©2010 IEEE.

关键词： Damage detection

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Analysis of shear strength for reinforced concrete beam-column joints

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Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) 2013年第7期41卷 1-4页

作者： Zhu, Hongping Dai, Yunjie Gao, Fei School of Civil Engineering and Mechanics Wuhan 430074 China Hubei Key Laboratory of Control Structure Wuhan 430074 China

The shear behavior of reinforced concrete shear panels was analyzed by self programming based on disturbed stress field model (DSFM). The shear strength of the shear panels was attained. Good agreement between the prediction results and the test ones was achieved with an average ratio of the prediction results to the test results of 1.16 and a variance of 0.11. Thus, the applicability and reliability of the self programming were validated. Then the shear behavior of reinforced concrete beam-column joints was analyzed. The shear strength of the beam-column joints was attained. Compared with the experiment resuts, it shows that good agreement between the prediction results and the test results was achieved with an average ratio of the prediction results to the test results of 0.87 and a variance of 0.23. The rationality and accuracy of shear analysis of reinforced concrete beam-column joints by using DSFM were validated.

关键词： Reinforced concrete

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DEM SIMULATION OF LIQUEFACTION FOR GRANULAR MEDIA UNDER UNDRAINED AXISYMMETRIC COMPRESSION AND PLANE STRAIN CONDITIONS

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Acta Mechanica Solida Sinica 2012年第6期25卷 562-570页

作者： Guobin Gong Peng Lin Yawei Qin Jun Wei Department of Civil Engineering Shantou University School of Civil and Environmental Engineering Shenzhen Graduate SchoolHarbin Institute of Technology School of Civil Engineering and Mechanics Huazhong University of Science and Technology Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology School of Civil Engineering Central South University

Based on three dimensional （3D） Discrete Element Method （DEM）, the paper presents simulation results of undrained tests on loose assemblies of polydisperse spheres under axisymmet- ric compression and plane strain conditions using a periodic cell. In the present work, undrained tests were modelled by deforming the samples under constant volume conditions. The undrained （effective） stress paths are shown to be qualitatively similar to experimental results in literature. A microscopic parameter in terms of redundancy factor （RF） is used to identify the onset of lique- faction （or temporary liquefaction）, with the condition of RF equal to unity defining the transition from ＇solid-like＇ to ＇liquid-like＇ behaviour. It is found that the undrained behaviour is governed by the evolution of redundancy factor under both undrained axisymmetric compression and plane strain conditions, and a reversal of deviatoric stress in stress path for medium loose systems oc- curs due to the fact that the system becomes a structural mechanism （RF 〈 1） transiently at the microscopic level during the evolution.

关键词： discrete element deviatoric stress periodic cell liquefaction redundancy factor

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