The Study On Numerical Simulationof Pile Lateral Dynamic Characteristics Base On Opensees

A pile foundation is used widely in engineering, which makes the study there on specifically important. However, the views of the complicated force of the pile foundation in a liquefying field are not consistent. Therefore, the study on the force interaction of the pile foundation is quite meaningful under the force effect. The article herein concentrates on a pile-ground-bearing platform structure which is under the force effect, and performing data stimulating analyses by using the software, Opensees. Thereafter, the writer put forward a simplified pile foundation anti-seismic model in a single pile state, and carries out parameters sensitivity studies and analyses thereon. The main steps are as follows:Firstly, in the initial design of a micro vibration table, a new type FBG data collecting system is used to ensure getting a precise test data. In addition, the writer has screened the test data by using soils, manufactured a model box and a model pile, arranged monitoring points, as well as designed a plurality of testing modes. Meanwhile, a non-contact laser displacement meter is provided to further verify the feasibility of the FBG measurement system used in the vibration table test.Secondly, Opensees PL finite element software is used for performing the data stimulating analyses on the vibration table test. it is found after the plurality of testing modes that the Opensees PL finite element software is not only able to stimulate the lateral force response of the pile in the liquefied ground in a better way, but also able to compute convergence rate more quick than other finite element software. The stimulating result is in conformity with the test one.Finally, it is the first time set up a two-dimensional finite element model of a ground body-single pile-bearing platform by using the Opensees software, and the writer has considered the impact on the pile foundation force by a free field ground body in the mode. The conclusions achieved are as follows:(1) With regard to the sand soil dynamic p-y element, the angle of internal friction impacts thereon widely, but the influencing level takes the second place.(2) With regard to the clay dynamic p-y element, the shear strength without draining water impacts thereon widely, as well as the strain value when the breadth bearing capability is reduced to a half.(3) The impacts on the pile structure force by the ground body length in the free field are: when the ground body length in the free field is sufficiently long, the impacts thereon by the ground features can be omitted, and when the ground body length in the free field is 300 meters, it can satisfy the requirements of computation.