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          Optimum study on wind-induced vibration control of high-rise buildings with viscous dampers

          Yun Zhou,DaYang Wang,XueSong Deng 한국풍공학회 2008 Wind and Structures, An International Journal (WAS Vol.11 No.6

          In this paper, optimum methods of wind-induced vibration control of high-rise buildings are mainly studied. Two optimum methods, genetic algorithms (GA) method and Rayleigh damping method, are firstly employed and proposed to perform optimum study on wind-induced vibration control, six target functions are presented in GA method based on spectrum analysis. Structural optimum analysis programs are developed based on Matlab software to calculate wind-induced structural responses. A high-rise steel building with 20-storey is adopted and 22 kinds of control plans are employed to perform comparison analysis to validate the feasibility and validity of the optimum methods considered. The results show that the distributions of damping coefficients along structural height for mass proportional damping (MPD) systems and stiffness proportional damping (SPD) systems are entirely opposite. Damping systems of MPD and GAMPD (genetic algorithms and mass proportional damping) have the best performance of reducing structural wind-induced vibration response and are superior to other damping systems. Standard deviations of structural responses are influenced greatly by different target functions and the influence is increasing slightly when higher modes are considered, as shown fully in section 5. Therefore, the influence of higher modes should be considered when strict requirement of wind-induced vibration comfort is needed for some special structures.

        • SCIESCOPUSKCI등재후보

          Optimum study on wind-induced vibration control of high-rise buildings with viscous dampers

          Zhou, Yun,Wang, DaYang,Deng, XueSong Techno-Press 2008 Wind and Structures, An International Journal (WAS Vol.11 No.6

          In this paper, optimum methods of wind-induced vibration control of high-rise buildings are mainly studied. Two optimum methods, genetic algorithms (GA) method and Rayleigh damping method, are firstly employed and proposed to perform optimum study on wind-induced vibration control, six target functions are presented in GA method based on spectrum analysis. Structural optimum analysis programs are developed based on Matlab software to calculate wind-induced structural responses. A high-rise steel building with 20-storey is adopted and 22 kinds of control plans are employed to perform comparison analysis to validate the feasibility and validity of the optimum methods considered. The results show that the distributions of damping coefficients along structural height for mass proportional damping (MPD) systems and stiffness proportional damping (SPD) systems are entirely opposite. Damping systems of MPD and GAMPD (genetic algorithms and mass proportional damping) have the best performance of reducing structural wind-induced vibration response and are superior to other damping systems. Standard deviations of structural responses are influenced greatly by different target functions and the influence is increasing slightly when higher modes are considered, as shown fully in section 5. Therefore, the influence of higher modes should be considered when strict requirement of wind-induced vibration comfort is needed for some special structures.

        • Monitoring of Corrugation Growth on Tracks with Cologne Egg Fastening System

          Hengyu Wang,Stuart Grassie,Yongquan Deng,Heji Zhang,Wenjian Wang,Zefeng Wen,Xuesong Jin 한국도시철도학회 2014 IJAR Vol.2 No.2

          Corrugation is a serious problem in railway industry. It may be more commonly seen in metro networks for that metro lines usually have more and sharper curves than the main lines. Research has shown that fastening system is an influence factor on corrugation. Server corrugation was found on tracks with Cologne egg fastening system (Cologne egg for short) shortly after the operation of a metro line. To understand the effects of Cologne eggs on the development of corrugation, curved and tangent lines with Cologne eggs were selected for corrugation growth monitoring. In order to compare the effects of different fastening systems on corrugation, monitoring was also conducted on tracks with the same line condition but using ordinary short sleeper fastening system. Monitoring of rail roughness was done during the whole period between two rail grinding operations using a Corrugation Analysis Trolley (CAT). The characteristics of corrugation growth, such as the speed of growth, the wavelength of corrugation, the distribution of corrugation, etc. were analyzed on different track configurations. Corrugation showed a rapid growth in the first a few weeks after grinding and slowed down after that. Monitoring results show that fasting system is a strong influence factor of corrugation growth. The effect of grinding was discussed. Comparison of corrugation growth of different grinding methods shows that proper grinding method would not only reduce the speed of corrugation growth, but also the final rail roughness level.

        • SCIESCOPUS

          Characteristics and prediction methods for tunnel deformations induced by excavations

          Zheng, Gang,Du, Yiming,Cheng, Xuesong,Diao, Yu,Deng, Xu,Wang, Fanjun Techno-Press 2017 Geomechanics & engineering Vol.12 No.3

          The unloading effect from excavations can cause the deformation of adjacent tunnels, which may seriously influence the operation and safety of those tunnels. However, systematic studies of the deformation characteristics of tunnels located along side excavations are limited, and simplified methods to predict the influence of excavations on tunnels are also rare. In this study, the simulation capability of a finite element method (FEM) considering the small-strain characteristics of soil was verified using a case study. Then, a large number of FEM simulations examining the influence of excavations on adjacent tunnels were conducted. Based on the simulation results, the deformation characteristics of tunnels at different positions and under four deformation modes of the retaining structure were analyzed. The results indicate that the deformation mode of the retaining structure has a significant influence on the deformation of certain tunnels. When the deformation magnitudes of the retaining structures are the same, the influence degree of the excavation on the tunnel increased in this order: from cantilever type to convex type to composite type to kick-in type. In practical projects, the deformation mode of the retaining structure should be optimized according to the tunnel position, and kick-in deformation should be avoided. Furthermore, two methods to predict the influence of excavations on adjacent tunnels are proposed. Design charts, in terms of normalized tunnel deformation contours, can be used to quantitatively estimate the tunnel deformation. The design table of the excavation influence zones can be applied to determine which influence zone the tunnel is located in.

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