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CONNECTING PARAMETERS OPTIMIZATION ON UNSYMMETRICAL TWIN-TOWER structure LINKED BY SKY-BRIDGE

The Twelfth International Symposium on Structural Engineering

作者： Huangsheng Sun Hongping Zhu Xiao Huang Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and 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

ISBN: (纸本)9787030357878

Based on a 3-DOF model of twin-tower structure linked by a sky-bridge,the frequency response functions and power spectral density(PSD) functions of the structural displacement,and then the time-averaged total vibration energy,are derived with the white noise as the earthquake *** the linking stiffness and damping ratio as the research parameters,the effects of them on the structural vibration responses are studied aiming at minimizing the vibration energy of the independent monomer tower or the integral structure,respectively,and then the optimal connecting parameters are ***,the influences of the sky-bridge elevation position on the optimal linking parameters of two multi-story-towers connected structure are researched ***,the seismic responses of the mega-structure,excited by El Centro,Taft and artificial waves,are comparatively researched in time domain,*** research results show that the connecting parameters at either end interactively affect the responses of the *** the optimum parameters of dampers cannot reduce the seismic responses of the both towers to the best extent simultaneously,the structural performance shows fine seismic reduction effectiveness with the damping *** optimal connecting parameters derived from the simplified 3-DOF model are also applicable for two multi-story structures linked by sky-bridge with dampers.

关键词： Twin-tower connected structure sky-bridge connecting parameter optimization seismic response

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Field monitoring and numerical assessment on cable stretching process of a suspended-dome

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology 2008年第9期30卷 93-97+107页

作者： Ji, Han Xiong, Shi-Shu Huang, Li-Ting Qin, Kai-Hu 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 Poly Real Estate Group Co. Ltd. Wuhan 430074 China

The field monitoring and the numerical assessment are performed on cable stretching process of a suspended-dome. The cable stress, key bar strain, node displacement and dome deformation were monitored and analyzed. It is concluded that the middle-cable effect on the outer-cable is more significant than the inner-cable effect on the middle-cable in the process, and the dome node displacements are toward the dome center. The monitored bars are safe in the stretching process, of which the outer cable should be monitored especially.

关键词： Cable-stretching process Construction monitoring Numerical assessment Suspended-dome

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DYNAMIC PERFORMANCE STUDY ON THE SUPER HIGH DAMPING RUBBER ISOLATION BEARINGS DEPEND ON THE REAL-TIME SUBstructure HYBRID LOADING SYSTEM

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The Twelfth International Symposium on Structural Engineering

作者： Liu Yi Yong Yuan Demi Ai Xian City Municipal Construction(Group) CO. LTD Dept.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

In this study,the developed real-time substructure hybrid earthquake loading test system for verification tests of rubber bearings for highway bridges and viaducts is studied.A series of the fast/real-time substructure hybrid earthquake loading tests on NR(natural rubber),HDR (high-damping rubber),and HDR-S(super-high-damping rubber) bearings specimens are presented. The test system utilizes the concepts of the real-time pseudodynamic test method and the substructure technique to combine the loading process of rubber bearing specimens and numerical modeling of bridge column and *** objective of the development of the test system is to pursue accurate prediction of the seismic response and investigate the isolation effects of rubber bearings considering the loading rate effects subject to earthquake ground motion.

关键词： Real-time hybrid loading system high-damping rubber bearing velocity control algorithm linear dynamic analysis gravity simulator

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3-D grid search based algorithm for intracloud lightning location

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International Journal of Earth Sciences and Engineering 2013年第3期6卷 455-460页

作者： Yang, Huizhen Zhao, Wenguang Zhang, Ruifang Zhang, Ping 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 Tech Wuhan China School of Architecture and Urban Planning Huazhong University of Science and Tech Wuhan China

Lightning location belongs to passive location. Current iterative algorithms used for passive location depend on an initial value and tend to diverge easily. To circumvent such issues, we deduced a three-dimensional (3- D) grid search algorithm to position and calculate intracloud (IC) lightning based on a two-dimensional grid search algorithm. The procedure of the three-dimensional grid search algorithm to positioning the lightning location is introduced. By using a multi-level grid search strategy, the most appropriate solution of the cost function is sought within the lightning space and the lightning location is found. The validity and stability of this method was confirmed through the simulation and numerical analysis. The result is close to the true solution after multilevel searching with the grid is divided reasonably and properly. © 2013 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.

关键词： Cost functions

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Technical integration and efficiency evaluation of low-carbon construction for rural architecture in hot summer and cold winter zone in China

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Tumu Gongcheng Xuebao/China Civil Engineering Journal 2010年第SUPPL. 2期43卷 410-415页

作者： Wang, Yang Wang, Xiaoming Zhu, Hongping Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Control Structure Wuhan 430074 China

Rural architecture is a significant topic in the field of energy-saving and climate changing in China, and taking energy-saving into account, there are many disadvantages to the rural architecture in the hot summer and cold winter zone. This paper analyzes the characteristics of rural architecture in the hot summer and cold winter zone, and establishes technical integration system of low-carbon construction for rural architecture in the hot summer and cold winter zone which includes planning and construction, key material, building envelope and renewable energy. Then with two demonstration projects of rural architecture in Yanhe village of Gucheng county hubei province as the case study, the paper applies the technical integration system of low-carbon construction for rural architecture in the hot summer and cold winter zone to the integrated efficiency evaluation of building energy-saving and economics.

关键词： Architecture

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Seismic response of montanic long-span suspension bridge considering spatical variation

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Gongcheng Lixue/Engineering Mechanics 2009年第SUPPL. 1期26卷 130-133页

作者： Long, Xiao-Hong Chen, En-You Li, Li School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan Hubei 430074 China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan Hubei 430074 China

The montanic long-span suspension bridge abuilding is taken as an example, the iterative fitting method which is compatible with design response spectrum is adopted to respectively simulate the uniform excitation, wave passage effect and multi-point excitation, which are in turn used as the earthquake ground motions input for the suspension bridge. According to two-phase aseismic fortification criterion, linear and nonlinear seismic time-history analyses are carried out under two kinds of combinations of earthquake ground motion inputs, i.e., the longitudinal and vertical directions and the lateral and vertical directions, the peak bending moment and shearing force distributions of the main tower are calculated. The analysis shows that the multi-support excitation effect affects greatly in the longitudinal bridge direction while the result of three cases is almost the same in the lateral bridge direction, and calculation results of the linear and nonlinear analyses are very close.

关键词： Iterative methods

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Analysis on dynamic stability of isolated bridges subjected to earthquake

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Gongcheng Lixue/Engineering Mechanics 2010年第SUPPL. 2期27卷 289-293页

作者： Li, Li Liu, Wen-Jing Zhang, Hang School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan Hubei 430074 China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan Hubei 430074 China

Structural dynamic stability is an important aspect of structural seismic performances. When earthquake happens, a relative motion would occur between girders and piers of the isolated bridge, and the eccentric force suffered by piers would increase, therefore, dynamic stability of isolated bridges subjected to earthquake should be analyzed. In this paper, the principle of dynamic stability was discussed and the elastic dynamic stability of isolated bridges subject to earthquake was studied using the combination of time-history. Eigenvalue bucking analysis was illustrated through the example of Dongjiang bridge, which is a double- layer-pier approach bridge with double traffic double LRB isolated continuous girders. 8 conditions of stability and initial eccentricity caused by temperature were considered. The results showed that: although the fixed pier is replaced by the isolated bearing, the dynamic stability under earthquake is improved because the deformations of piers become small.

关键词： Earthquakes

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Numerical simulation of aeolian vibrations transmission lines by CFD

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Gongcheng Lixue/Engineering Mechanics 2009年第SUPPL. 2期26卷 235-240页

作者： Li, Li Kong, De-Yi Long, Xiao-Hong Liang, Zheng-Ping School of Civil Engineering and Mechanics in Huazhong University of Science and Technology Wuhan Hubei 430074 China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan Hubei 430074 China

In order to analyze the mechanism of aeolian vibrations of transmission lines and the wind energy power input, a numerical simulation method has been studied based on the computational fluid dynamics (CFD). The aeolian vibration of transmission lines has been simplified to a two-dimensional cylinder surrounded by unsteady wind flow. Firstly, the Karman's vortex street behind the static transmission line has been calculated in the subcritical crosswise wind field. Through compared with the classical literature the model has been proven valid. Then the influence of the oscillation amplitude to the Karman's vortex has been analyzed using the oscillating transmission line model. Based on these researches, the relationship between the oscillation amplitude and wind energy power input has been obtained. By comparing with the curve obtained from a series of wind tunnel experiments, the mechanism of aeolian vibrations and their self-limit characteristic has been confirmed. In addition, the serviceability of the different wind energy power input curves has been studied.

关键词： Computational fluid dynamics

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Time domain analysis of buffeting responses of sidu river suspension bridge

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Gongcheng Lixue/Engineering Mechanics 2010年第SUPPL. 1期27卷 113-117页

作者： Long, Xiao-Hong Li, Li Hu, Liang Hubei Key Laboratory of Control Structure School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan Hubei 430074 China State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China

Sidu River Bridge is a montane long-span suspension bridge. The structure of the bridge is super flexible and wind sensitive, so the wind-resistant capacity must be examined for the bridge. The 3D finite element model of the bridge was established by using general finite element analysis (FEA) software ANSYS, and its dynamic characteristics were obtained. By introducing the modified Geodatis spectral representation method, the turbulent stochastic wind-velocity field of the bridge was simulated and checked. Then, the time-history of buffeting force was calculated according to the quasi-steady theory. Finally, the results of the time domain buffeting analyses were obtained by conducting time history analysis. This study can provide reference for the wind-resistant design of similar bridges.

关键词： Time domain analysis

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Modified kelvin pounding analytical model

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Gongcheng Lixue/Engineering Mechanics 2009年第SUPPL. 2期26卷 245-248页

作者： Ye, Kun Li, Li College of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Control Structure Wuhan 430074 China

The earthquake-induced pounding between closely spaced structures can lead to structural damage. Because a structural pounding is a complicated nonlinear problem, in order to investigate the response of structures involving the pounding, it is important to select a reasonable impact analytical model in the pounding analysis. In this paper, the review for impact analytical models and methods for structural poundings is firstly performed. And then, an improvement on the Kelvin model is proposed to remedy the drawbacks of the Kelvin model;the determination of the relevant parameter in this modified Kelvin model is theoretically derived. Finally, through a numerical experiment, the correctness of the modified Kelvin model is verified, and reliable results can be obtained by using the modified Kelvin model in the analysis of structural poundings.

关键词： Earthquakes

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