Integrated Reinforcement Design Of Multi-tower With A Large Chassis-mount

Because of the uneven settlement,a multi towers with large chassis structure appears serious cracking in it's chassis in a practical construction engineering,which will affect the normal use of the building.In order to ensure the safety and durability of the structure,this structure need be reinforced design.First,it's need to be distinguished the reasons for cracking in order to take appropriate reinforcement measures,making a systematic site survey to the structure and a real-time observation and monitoring on the occurrence of cracking at the beam and plate components,mapping crack observation chart,grasping the development of cracks in dynamic,analyzing and finding out the root causes of the cracking.Second,checking the basic characteristic and design index of the whole structure by using the design software PKPM,taking an elastic static analysis of the whole model which obtains the seismic response and the self-vibration characteristics,validating the reasonableness of the original design.At the same time,using MIDAS/GEN to making a supplementary comparison and analysis of the whole structure,obtaining the most unfavorable internal forces of cracking component to Proposed overall reinforcement and partial reinforcement simultaneously strengthening scheme is reasonably practicable.Using the improved roof structure raft foundation layer and basement roof structure layer laminate layer to reinforcement the CFG composite foundation grouting implementation of the overall.Finally,taking a contrastive study for the beam body more serious cracking through around the implementation of external CFRP and steel plate method.Through comparing and analysis,accord to the cost of reinforcement and the economic index have been reasonably practicable to determine the partial reinforcement program and analysis section reinforcement design effective programs that they have implemented.The results proved to be effective.The main conclusions are as follows:(1)Through on-site field survey,combined with geological survey reports and settlement observation records,conducting a comprehensive analysis to determine the basement roof,retaining walls and part of the frame beam cracking of main reasons for building construction,inadequate foundation treatment lead to produce uneven settlement.(2)The analysis gained by PKPM and MIDAS/GEN shows that the original design of the design specifications can meet the requirements of existing norms,Mode-basically the same order,periodic deviation is less verified the rationality and feasibility of the original designs,also verified the reliability of the calculation model.While MIDAS/GEN under wind loads and seismic analysis indicated that at most two turrets on the outside turn more serious,displacement at the top of the Tower the largest part of beam,column and part of basement retaining wall high pressure,should arouse attention in structural design and construction.(3)Nonlinear simulation analysis indicates that,stacks collection layer can effective improve cracking widget of stiffness and hosted capacity,but unable to control crack under subsequent loading continues to grow,in the upper parts of the load in case of increasing through micro-fracture is likely to further increase,so for cracking serious of beam body has necessary used local reinforcement design programme,to improve Widget of hosted force and durability.(4)After the implementation of part of the design according to reinforcement measures settlement observation data showed that reinforcement program has been implemented to some extent,control the structure of the overall settlement deformation,reinforcement scheme is feasible and effective.