Analysis Of Force Performance In The Process Of Building Translation

he development of China's urbanization is in full swing.More and more people gather in the city,which makes the city expand continuously,but the limited land limits the scope and footsteps of the urban development.The renovation and demolition of old towns not only improves the living standard of the original residents,but also promotes the development of the city.It is part of the urbanization process.The old city reconstruction,road widening and so on can not only take the way of dismantling,for the use of valuable historical relics and historical relics should be protected,so that it will continue to play a role.The conflict between site protection and the planning of new urban area requires that buildings should be transferred to the right place for off-site protection.There are many factors that need to be taken into consideration in the translation of buildings,not only to the change of the structure and the moving speed,but also to the influence of the internal force and vibration of the superstructure caused by the translation,so as to ensure the safety of the superstructure and ensure the normal use after the translation is in place.Many experts and scholars have done in-depth research on translation underpinning and translation monitoring,but lack of analysis and Research on translation process system.Based on the predecessors' research contents and taking the translation of the comprehensive building of Laiwu hi tech Development Zone as the engineering background,the translation process is systematically analyzed.First,based on the basic truncation,three models of extreme state before the translation are established,which are the original model,the local underpinning model and the construction of the trusses after the construction.The internal forces of the beam and column of the three models are compared and studied.Then,four models were established before launching the top thrust building,and the influence of different loading ways on the underpinning structure and the internal force of the superstructure was studied.Finally,according to the building translation process,the optimized friction pendulum isolator is used to simulate the roller bearing,and the time history function and the displacement time history curve are established.The effects of the four different time range conditions on the displacement,velocity,acceleration and angle of thesuperstructure are analyzed with respect to the original structure small earthquakes.Through the above analysis,the following conclusions are drawn:(1)the change of the support form affects the internal force of the beam,and gradually decreases with the increase of the number of layers,which is mainly concentrated at the bottom.The amplitude of bending moment produced by horizontal load is larger than that of vertical load,and the magnitude of node displacement decreases with the increase of the number of stories.The underpinning truss plays a favorable role in reducing the bending moment of the lower end of a negative column and the variation of shear force.(2)before the start of the main support for the translation of axial deformation of the beam is greater than the podium.The two points loading is easier to start than the one point loading,and the axial deformation of the underpinning beam is reduced by more than 50%.Each axis applying a same force,the rightmost node displacement relative to the theoretical load more evenly,but increase the displacement of each axis node.(3)each axis force is applied,compared with a two-point loading loading,underpinning beam maximum axial force can be reduced by 50%~70%,bracing force decreased by about50%.And the single axis two-point loading friction force and underpinning axial force of beam gap is reduced by about 10%.Each axis,applying with diagonal axial force difference decreases,underpinning truss deformation is more uniform.(4)each axis applied force,two-point loading with respect to a point load,the maximum bending moment of column end to reduce 50%~80%,a negative bending moment maximum value decreases by about 60%.Each axis applying a same force when the moment of column relative to the increase of each axis force is applied,will cause structural torsion.(5)during the translation process,the displacement load of the same size is slightly faster than that of the one point loading.The faster the speed is,the faster the vibration is,and the maximum angle of the superstructure is generated at the middle floor.