| In recent years,anchored stabilizing pile has been widely used in landslide control project based on its excellent seismic performance.However,because of the complex transmission mechanism and the unclear understanding of the pile-anchor-soil dynamic interaction,the seismic design theory lags far behind the engineering application so that the seismic performance can not be predicted effectivelly.Therefore,it is necessary to study the seismic performance of anchored stabilizing pile based on an advisable method.In view of this,according to the Winkler foundation beam theory,the pile-anchor-soil coupling nonlinear dynamic equation was established,and then Pushover analysis method was used to study the seismic performance of structure,so as to lay a theoretical foundation for subsequent seismic design.The main research contents are as follows.(1)In this paper,the advantages and disadvantages of several representative Winkler foundation beam models were compared and analyzed.Based on Matlock non-linear dynamic model and considering the plastic state of soil,a pile-anchor-soil coupling nonlinear dynamic model was established.(2)The distribution patterns of lateral loading directly affect the results of Pushover method in studying the seismic performance.Therefore,according to the shear results,the instantaneous adaptive distribution pattern applied to the structure was inversely calculated by mode-superposition method.(3)The capacity spectrum curve obtained by Pushover analysis method combined with the demand spectrum reduced by R-u-T strength reduction model to find out the performance point.Then the seismic performance of structure was judged according to the functional area of the performance point and the corresponding displacement of pile top.(4)Different design parameters reflect different seismic performance.Based on this,the influence of material strength,grade of flexural reinforcement,section size,embedded depth and reinforcement eara on the seismic performance was analyzed by means of Pushover method.The order of influence results is:reinforcement area>section size>grade of flexural reinforcement>material strength>embedded depth.(5)The feasibility of Pushover evaluation method was verified by shaking table test and numerical simulation.The results show that the Pushover method is reliable in studying the seismic performance of anchored stabilizing pile.(6)At precent,the Lizheng design method widely used in engineering only considers the elastic state of structure,namely,it considers that the structure loses its working ability as soon as it yields.However,the structure can continue to work when it enters the plastic state.Therefore,in line with the principle of saving materials,the Pushover method is used to optimize the seismic design of anchored stabilizing pile. |
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