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Strut-and-Tie Method as a Basis for Optimization of Hoop Prestressed Tendons in Abnormally Shaped Anchorage Zone of Cable-Stayed Bridge Pylon

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Journal of Southwest Jiaotong University(English Edition) 2010年第3期18卷 206-214页

作者：李跃梅世龙 School of Civil Engineering and Mechanics Huazhong University of Science and Technology Hanyang Building Management Centre Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology

Based on full-scale segment model tests of the abnormally shaped anchorage zone of the Maling River cable-stayed bridge pylon and FEM analysis, its mechanical and deformation properties were obtained, and the validity of FEM analysis was verified. An optimal layout of prestressed tendons in the anchorage zone was obtained by using the strut-and-tie method （STM）. The comparison FEM analysis between the full-scale segment model and the optimal prestressed tendons model show that： the optimal model not only saves prestressed tendons, but also achieves the same cracking resistance; STM method is reliable and accurate in the analysis of the abnormally shaped anchorage zone of cable-stayed bridge pylon.

关键词： Cable-stayed bridge Abnormally shaped anchorage zone Prestressed tendons Optimization

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Stability analysis of a long-span latticed shell

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Gongcheng Lixue/Engineering Mechanics 2008年第SUPPL. 2期25卷 139-143+149页

作者： Liu, Wen-Jing Li, Li Long, Xiao-Hong 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 stability analysis is the key problem in the design of latticed shells, especially in single-layer latticed shells. A long-span ball gymnasium is adopted as a practical work, and it is analyzed by nonlinear finite element method under the first and the second kinds of stability problems. The holistic calculation aimed at 11 conditions in bearing capacity, material and geometric nonlinearity are considered. The second kind of stability is analyzed by the yielding criterion named the boundary edge fiber. The first kind of bucking modes and two kinds of stability factors under two typical conditions are given. The results show that the first kind of stability of this latticed shells accords with the requirements of correlative specifications;the second kind of stability is poorer. Therefore, the analysis of the second kind of stability should be paid attention.

关键词： Stability

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Non-linear vibration of cables subjected to periodic support excitation and vibration loosening

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology 2008年第2期30卷 75-79+93页

作者： Wang, Bo Guo, Cui-Cui Zhang, Hai-Long Xu, Feng 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

Based on Newton's laws of motion, the inner oscillatory differential equation which considered the excitations at both beam and tower end was deduced. Analyzing the vibration characteristic relations with those ingredients such as the matching ratio of natural frequencies of tower end, beam deck to stay cable, the initial forces of cables, excitation amplitude, and initial oscillate displacement and damping ratio. Secondly, the oscillatory equilibrium equation in stay cable loosening state was established with the tension forces of cable in loosening period. According to the tension forces variation of cable, calculated numerically the whole vibration process using the subsection integration method to response the variation regulation of loosening and non-loosening state.

关键词： Loosening effect Nonlinear vibration Stayed cable Subsection integration method

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System identification based on experimental responses of a frame structure with unknown inputs

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Zhendong yu Chongji/Journal of Vibration and Shock 2010年第8期29卷 228-231页

作者： Li, Wei-Ming Zhu, Hong-Ping Wu, Xian-Guo Xia, Yong 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

System identification of a frame was performed based on experimental acceleration responses with unknown inputs. The ambient vibration was simulated in the lab, and the block Hankel matrix and the cross-correlation were calculated according to the eigensystem realization algorithm. The singular values were obtained by singular value decomposition. The frequencies and damping ratios were identified according to the values of indices MAC, EMAC, MPC, CMI, and the pseudo parameters were eliminated. The results were verified by the experiment and the FEM calculation, and their difference was inspected. The investigation indicates that the dynamic parameters are able to be identified by use of eigensystem realization algorithm with unknown inputs.

关键词： Singular value decomposition

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Application of Grey System Theory in Peace Avenue Overpass Bridge Construction Linear control

Application of Grey System Theory in Peace Avenue Overpass B...

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International Conference on Management and Service Science, MASS

作者： Jun Hu Zhi-feng Liu Wen-sheng Xu School of Civil Engineering & Mechanics Huazhong University of Science & Technology Wuhan Hubei China Hubei Key Laboratory of Control Structure Huazhong University of Science & Technology Wuhan Hubei China

Peace Avenue overpass bridge belong to large-span continuous rigid frame, the gray system theory prediction method has been applied to Peace Avenue overpass bridge construction linear control. The construction of pre-camber gray prediction model is established, and is verified at Peace Avenue overpass bridge linear control. Monitoring Practice shows that the gray system theory can be applied to large-span continuous rigid frame bridge construction linear control, and expose high theoretical significance and practical value.

关键词： Bridges control systems Predictive models Uncertainty Differential equations Peace technology Concrete Monitoring Structural beams Stress

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OPTIMAL DESIGN OF VISCOELASTIC DAMPERS COUPLING ADJACENT UNEQUAL-HEIGHT structureS UNDER EARTHQUAKES

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The Twelfth International Symposium on Structural Engineering

作者： Hongping Zhu Xiao Huang School of Civil Engineering & Mechanics Huazhong University of Science & Technology Hubei Key Laboratory of Control Structure Huazhong University of Science & Technology

ISBN: (纸本)9787030357878

Optimal design of viscoelastic dampers(VED) coupled two adjacent unequal-height structures under earthquakes was ***,optimal parameter expressions of the Kelvin model were used to calculate the total optimal stiffness and damping coefficient of ***, using enumeration method and taking total kinetic energy of adjacent structures as optimization objective,the optimal placements of VEDs were *** results show that for different distributions of dampers,the optimal parameters of VEDs calculated by parametric studies are all consistent to the theoretical *** optimal placements of VEDs were distributed placed on the third,the fifth and the tenth *** on the locations of a certain number of dampers is important;optimization on the number of dampers has little effect on the ability of seismic response reduction.

关键词： Adjacent structures viscoelastic dampers optimal placement seismic response

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FAILURE MODE AND CRITICAL TEMPERATURE OF TUBULAR Y-JOINTS UNDER FIRE CONDITION

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The Twelfth International Symposium on Structural Engineering

作者： Fei Gao Shaobo Chu Miao Zhang Enxu Lu Xingquan Guan Zhigao Wu School of Civil Engineering and Mechanics Huazhong University of Science and Technology Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology

ISBN: (纸本)9787030357878

The fire resistance of tubular Y-joints is investigated by using finite element software *** with the existing experimental results,the finite element method is verified to simulate tubular Y-joints properly under fire *** to numerical analysis,tubular Y-joints always fail at the intersection between the chord and the *** failure mode is influenced by geometrical parameters and load ratio of the *** critical temperature and the fire resistance limit time are also studied for the joint under fire *** study is then *** effect of geometrical parametersθ,βandγ,as well as load ratio n,on the fire resistance of tubular Y-joints is *** fire resistance of the joint significantly reduces with the increase of the load *** the condition of the same load ratio,the biggerβis,the better the performance of fire resistance *** the load ratio is small,the biggerθis,the better the performance of fire resistance ***,the effect on fire resistance of the joint decreases as the load ratio increases.γalmost has no effect on the fire resistance of the *** axial reaction caused by expansion of steel material is greatly bigger than that caused by applied load and seriously affects the fire resistance of tubular *** becomes smaller with the increase of load ratio.

关键词： Fire resistance tubular Y-joints finite element analysis failure mode critical temperature

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Seismic fragility analysis of RC isolated continuous girder bridge using radial basis function neural network

Seismic fragility analysis of RC isolated continuous girder ...

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2014 International Conference on Materials Science and Engineering Technology, MSET 2014

作者： Chen, Bei Lei Long, Xiao Hong Li, Jian Jun School of Civil Engineering and Mechanics HuaZhong University of Sci. and Technology Wuhan 430074 China Hubei Key Laboratory of Control Structure HuaZhong University of Science and Technology Wuhan 430074 China China Railway Siyuan Survey and Design Group Co. Ltd. China

ISBN: (纸本)9783038351023

To approximate the correlating mathematical relationship between many earthquake records' PGA and the responses of bridge structures with minimum efforts and without loss of accuracy, an artificial neural network-based method is proposed in combination with LHS and IDA method. This method is employed to conduct the seismic fragility analysis of RC isolated continuous girder bridge. To investigate the suitability of this approach, the results of the new approach are compared to those obtained by the Cloud method. The comparison shows that the new method is more efficient and reliable. © (2014) Trans Tech Publications, Switzerland.

关键词： Radial basis function networks

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Failure Behavior of Axially Loaded Tubular Y-Joints under Fire

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Advances in Structural Engineering 2016年第9期16卷 1523-1533页

作者： Gao Fei Zhu Hong-Ping Liu Xiang-Nan 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： fire resistance tubular Y-joints failure mode critical temperature

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Seismic reliability analysis of urban buried water supply pipelines

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International Journal of Earth Sciences and Engineering 2013年第1期6卷 61-67页

作者： Cheng, Zhiyuan Li, Li Long, Xiaohong Wu, Kui School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan China

The solid model of buried pipelines and soil was built with the finite element software Ansys11.0. Considering the pipeline-soil interaction, the time history analysis was conducted on the buried pipelines under the effects of earthquake and the response peaks of buried pipelines at different earthquake levels were obtained. According to the mean and standard deviation of pipeline resistance, the reliable probability of the buried pipelines at the corresponding earthquake level was calculated using the structural reliability theory. Q area of W city was taken as an engineering example and the seismic reliability of water supply pipelines buried underground was calculated. The results demonstrate that there is about 15% difference between the results of the finite element timehistory method and those of the method of China's seismic code, revealing the conservativeness of the latter method;the earthquake damages to large-diameter pipelines are less than those to small-bore *** flexible joints have better ductility than rigid ones and thus suffer less earthquake damages The earthquake damages to short pipelines are less than those to long pipelines, and the gray iron pipelines have relatively poor anti-seismic performance. © 2013 CAFET-INNOVA TECHNICAL SOCIETY.

关键词： Finite element method

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