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Song W.-W.,Wuhan University | Liang S.-G.,Wuhan University | Zou L.-H.,Wuhan University | Wen S.-Q.,Wuhan Architectural Design Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

Wind tunnel tests of surface pressure scanning with a rigid model and vibration measurement with a stick-like aero-elastic model for a 100-meter-high monument with diamond-shaped cross-section were conducted, and then its frequency domain wind load model was established based on the pressure measurement data and the wind-induced response of the structure was calculated with the method of random vibration theory. Meanwhile, the aerodynamic damping ratio were identified by applying the random decrement technique (RDT). When the aerodynamic damping ratios were considered in the structural complex frequency response function, the calculation results of the wind-induced dynamic responses agreed well with the aero-elastic model test ones. Due to the difference between the structural actual modal shape and the linear modal shape of the stick-like aero-elastic model, modal shape correction factors were adopted to modify the aero-elastic model test results, and then the actual structural responses were acquired. The analysis results showed that the frequency domain response analysis method of a actual high-rise structure with a wind load model established using the surface pressure scanning test of a rigid model, combined with an aerodynamic damping identification using the aero-elastic model vibration measurement test, can be used to accurately assess the wind-induced aero-elastic responses of high-rise structures with low frequency small damping under strong wind actions. Source

Chen G.-J.,Hydrogeology and Geoengineering Investigation Institute of Hubei Province | Chen S.,Wuhan Architectural Design Institute
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2010

To ensure the geological security for the development of urban planning of facility-sliding strata of Badong Formation in the Three Gorges reservoir area, we discuss the geological environment development and protection issues in abnormal slope areas by means of system analysis and analogy. Loess landslide in Badong City is a super complex deformable body formed by multi-stages, and systematic analysis indicates that under the condition of the operation of Three Gorges reservoir, the loess landslide is nearly in whole stability except the front which can be put to restrictive use.So part of relocation is necessary and appropriate. Generally speaking, the new site area and the loess landslide share similar geological environment, belonging to the slope geological environment of the Three Gorges reservoir area characterized by facility-sliding strata of Badong Formation and consequent slope structure. The development of a large number of influential landslides reveals a more vulnerable side of the geological environment, and as a result it can only be subject to restrictive use. Strengthening the construction of geological disaster prevention system and risk management can control the risk level of the planning and development in allowed geologically secure conditions. Source

Liu H.-Y.,PLA Air Force Aviation University | Wang Y.-Y.,Wuhan Architectural Design Institute
Proceedings - 2nd IEEE International Conference on Advanced Computer Control, ICACC 2010 | Year: 2010

This paper puts forward a adaptive inverse saleh function predistorter based on direct learning architecture according to the feature of saleh model to compensate for the nonlinearity of Power Amplifiers (PA). In this paper, we focus directly on a particular PA model and building a corresponding predistorter, After approximating the nonlinear static part by the four parameters function, Memoryless inverse saleh function model are adopted according to the saleh model. its parameters are estimated by using the intelligent algorithm. The identification technique of the predistortion is easy. It is proved to be correct through Matlab simulation. © 2010 IEEE. Source

Yang H.,Chongqing University | Chen J.-K.,Chongqing University | Chen Y.-S.,Wuhan Architectural Design Institute
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2012

Based on the regular and symmetrical reinforced concrete typical spatial frame, 8 kinds of infill walls arrangements were selected out for comparison including plane and/or vertical irregular configuration. Based on the OpenSees framework, flexibility method based fiber model was adopted to simulate the nonlinear responses of columns under biaxial bending and varying axial forces, and equivalent model with diagonal compression strut was adopted to simulate the infill walls. Nonlinear responses analyses of the each spatial frame under rare earthquake excitations were carried out. The results showed that reasonable arrangements of infill walls could effectively decrease seismic responses of spatial frames. Vertical irregular configuration of infill walls will significantly increase the seismic response of frames, and story side-sway mechanism always develops at the floor that infill walls were lessened or abolished. Plane irregular configuration of infill walls occurring similarly at every floor could decreases the seismic responses of frame to a certain extent, but plastic deformations will concentrate on some local plane locations where the infill walls were abolished. Plane and vertical irregular configuration of infill walls will also result in the plastic deformations concentrating on specific floor, the effects of concentration of plastic deformations caused by vertical irregular configuration will remarkably surpass the adverse effect of nonlinear seismic responses due to plane irregular configuration of infill walls. Source

Chen G.-J.,Hubei Geological Environment Station | Li C.-A.,China Three Gorges University | Chen S.,Wuhan Architectural Design Institute | Shao L.,China Three Gorges University
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2013

According to the regional survey for geo-hazards, thousands of landslides occurred in the Three Gorges reservoir area. Chronology studies show that these landslides mostly occurred after the Mid-Pleistocene and could be divided in 3 stages, namely, (41-37)×104 aBP, (31-27)×104 aBP and (17-5)×104 aBP. These landslides mostly occurred in the interglacial period and could be well related with the regional uplift and geological process of the formation of river landform in the Three Gorges area. Based on these we conclude that the occurrence of the landslides can be well correlated with tectonic uplift, climate change, rapidly down-cutting and breakthrough development in the Yangtze River. It is inferred that the cut-through timing of the Three Gorges probably be Early Pleistocene mainly owing to the loss of landslides which ages older than 54×104 aBP. Source

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