The Computer Simulation Of The Tilt And Rectifying Process Of The Buildings On The Collapsible Loess Foundation

As building oblique phenomenon is increasing,in view of the inclination rectification technology is also in constant development of the building,and becoming mature,but for building oblique,deviation of theoretical research is still in the exploratory stage.In the actual correction work,but now more or take "corrective,monitoring,and adjust" principle,can't do the whole process of tilt,deviation of building simulation.This paper some buildings in collapsible loess area as the background,the introduction of collapsible loess in the model before and after immersion in the foundation,the foundation set up by adopting the finite element software MIDAS/Gen-base-the upper structure space finite element model to work together,to simulate the process of building tilting and correction,and for the tilt,rectify the deformation and internal force is analyzed.In order to study the building in the process of tilt and rectification,the displacement and internal force variation law of building structure,this paper tries to put forward a new simulation method,namely using non linear elastic Winkler foundation model to simulate the process of building tilt and rectifying.The main research is as follows:(1)To establish a foundation,foundation,upper structure work space finite element model,at the same time the Winkler foundation model and load-settlement(p-s)curve was simulated by combining properties of foundation soil,the buildings from inclined to rectify the whole process of simulation.(2)The building foundation soil in the case of flooding or by external disturbance,subsidence occurs,extent of flooding and between the structure of building slope displacement and internal force variation law.(3)The change of the structure of the structure,the internal force and the force of the foundation is studied in the process of tilting.(4)The change of the structure of the structure,the internal force and the anti-force of the foundation in the course of rectifying the deviation.And then,according to the analysis results,the reinforcement should be found.According to the analysis,the following conclusions are drawn:(1)Building in both tilt and rectifying process,the rate of change of slope rate is increasing,when the foundation stiffness distribution,building a whole sink,tilt rate will not change.(2)Building in the process of tilt,deviation,maximum internal force of the structure and the location of maximum stress is always appear in the surface or near the soil surface.(3)In the process of slope,with the enlargement of the extent of flooding,the structure of the tilt rate gradually increased,the structure of the internal force and stress values are also growing.Until the extent of flooding to centroid axis position structure,the structure of theinternal force and stress reaches maximum value.When flooding range covers the whole raft foundation,the structure of the internal force and stress distribution characteristics of the same as the before flooding.(4)In the process of rectifying,the structure of the internal force and stress continues to increase,but the extent of change is very small.If before rectifying increase by means of strengthening the foundation stiffness,can reduce the maximum internal force of structure,so as to improve the security of the rectifying process.(5)When the foundation stiffness change of the structure of the internal force distribution on a larger more to the foundation stiffness.The stiffness of the foundation soil is poor,reduce local scope can make the structure internal force redistribution,so that the structure internal force,stress decreases.(6)In the process of rectifying,ground reaction force will appear two peaks.After completion of the rectification,the need for the two peaks of foundation bearing capacity and checking calculation of reaction,in order to determine whether the foundation reinforcement is needed.