Research On Mechanical Behaviors Of Tower-type Structure Translocation System

The contradiction between urban construction and preservation of cultural building relics has increasingly become evident as the continuous development of urbanization in China.Translocation technology can be a favorable solution to this contradiction.Tower-type structure buildings account for a considerable proportion in cultural building relics in China,there are rare practices on the translocation of tower-type structure buildings at home and abroad,remains to be further in-depth research..Based on one typical tower translocation project,this thesis has researched systematically on the mechanical behaviors of tower-type structure translocation system with the following main aspects:?1?We conducted finite element analysis on the stress of typical tower-type structure,and the safety factor of the anti-capsizing of the tower structure was proposed as 5.0;The tower structure shift enhancement system is proposed.The system can improve the overall stability of the typical tower structure and increase the anti-overturning safety factor by 2.2 times,which makes the structure of the tower structure more reasonable;Compared with the monitoring results of the enhanced system,the correctness of the finite element analysis was verified;The main factors that influence the performance of the typical tower structure and its influence law are analyzed;To simplify the structure of typical tower,key position can be used for rapid calculation of tower body was deduced at the top of the column lateral stress,such as theoretical calculation formula,the results of theoretical calculation and finite element calculation results,the monitoring results are compared,its applicability is verified.?2?Targeting the harsh requirements on deformation and cracking in the translocation of cultural relics architecture tower body,we designed pre-stress beam and slab style underpinning structure?shorted for underpinning structure?;The underpinning structure static,translational force deformation finite element analysis of two kinds of working conditions,and the results show that the stress and deformation of the static working condition can be 1.2 x magnification translation the underpinning structure stress and deformation under the condition of rapid calculation;It is determined that the safety reserve coefficient of the torsion beam is 1.6,which can be compared with the results of the finite element calculation and the monitoring results,indicating that the safe reserve coefficient is reasonable.?3?Targeting the translation of the tower structure of soft earth,we used composite foundation to reinforce the translocation line;The finite element analysis of the deformation of the track girder under the action of translational load is proposed,and the control limit of the difference deformation,duration and width of the rail beam is suggested;According to the results of fem and the monitoring results,the bed coefficient k₀ of E.Winkler elastic foundation beam method used in the calculation formula is modified,when translocation speed is 0.5¹.5m/h:the revised value?is0.6¹.0 calculated by estimation method and is 1.7².1 calculated by static loading method.The coefficient can be used to calculate rapidly the deformation of rail beams.?4?Targeting that cultural relics architecture tower body has a poor anti-seismic performance,we add isolation bearing to improve its anti-seismic performance,and research the dynamic response characteristics of tower-type structure from aspects ofdynamic characteristics;The results show that the self-vibration period of the typical tower structure increases by 4.63 times,far from the predominant period of the site,and reduces the damage caused by resonance;The structure vertex acceleration,interlayer displacement and interlayer shear force are all significantly reduced,and the earthquake effect is more remarkable;There is no obvious difference in structure dynamic response to a tower structure with a torsion chassis.