Analysis On Sluice Seismic Capacity In The Middle And Lower Reaches Of The Yellow River

Foundation of sluice is soil in the middle and lower reaches of the Yellow River,and its distribution is located in North China earthquake zone.As the code for seismic design of domestic changes,seismic capacity of the original design? sluice is insufficient,we need to recheck aseismic measures of the sluice.At the same time,along with the development of the calculation method,compared with the current seismic requirements,the sluice which is designed by using pseudo-static method has been slightly less,it is urgent to carry out seismic capacity analysis to the sluice structure by the more advanced calculation method.This project has studied that soil properties of sluice? foundation and the structure form of sluice have influenced on aseismic capacity of sluice in the area,we have got the typical foundation soil and typical structure forms by the method of statistical analysis of sluices.Considering the interaction between structure with foundation soil,different boundary of foundation model and the ground motion of water pressure,according to the typical foundation soil and typical sluice,using modal decomposition response spectrum method and time history analysis method,we have got actual seismic ability of sluice structure under the seismic fortification intensity.Analysis on the seismic response of vibration response spectrum and time history analysis,we recommend the calculation method about seismic capacity of sluice in the middle and lower reach of the Yellow River.Through the above research,the conclusion as follows:1.Typical foundation soil of sluice in the middle and lower reaches of the Yellow River as follows: the first layer is sandy loam;the 2nd layer is loam;the third layer is clay;the fourth layer is silt;the fifth layer is fine sand;the sixth layer is medium sand,the ratio of layer thickness is 1:1.54:0.63:0.88:1.02:0.53.2.Typical structure form of sluice in the middle and lower reaches of the Yellow River:(1)The height of chamber is 5~9 m,the length of sluice bottom is 9~11 m,the head of the downstream? pier uses the semicircle,the head of the downstream? pier head uses streamline,the thickness of the side pier is 0.6~1.0 m;(2)The height of machine bridge is 4.0~8.8 m,above 5m,sluice uses double structure and install beam in the riveralong direction,the height of bottom is more than the upper height,the width of bent frame column vertical is 0.3~0.45 m in the transverse direction,the width of bent frame column is 0.35~0.35 m in the riveralong direction;(3)Structure of hoist room is brick structure,hoist room has ring beam.3.Under seismic action,the transverse deformation of chamber structure is more than the riveralong deformation of chamber structure,the transverse deformation of Machine Bridge and hoist room room is less than the riveralong deformation.Besides along the height direction of the sluice,the displacement of sluice increases gradually.Among them,the deformation of Machine Bridge is maximum,the deformation of hoist room takes second place,and the deformation of chamber structure is minimal.4.Consideration of soil,not only we have got the natural frequencies of sluice structure,but also we have got the natural frequencies of soil and the whole structure of the soil and the sluice.Further amplified the dynamic stress of sluice structure,delayed the dynamic stress of sluice structure.Among them,the amplification effect of chamber structure is maximum,the amplification effect of Machine Bridge takes second place,amplification effect of hoist room is minimal.5.Under the same foundation model,compared with the fixed boundary,viscoelastic boundary reduced the dynamic stress of sluice structure.Besides considering the nonlinear contact of sluice structure and soil,reduce the dynamic responses of the structure,but increases the dynamic response of other structures that connect to the structure.The results of time history analysis method is are more accurate and real than the results of mode-superposition response spectrum method.Therefore,we recommend to use time history analysis method when We implement seismic dynamic analysis of sluice.