The Finite Element Analysis And Structural Optimization Of The High Chimney Construction Platform Based On Site Monitoring

With the rapid development of social economy,our country keep increasing the investment in infrastructure construction,making construction a thriving vitality in China.Moreover,as chimneys are indispensable structures in national industrialization,tall chimneys and new structural chimneys emerge constantly.The reinforced concrete chimneys have better durability and anti-seismic performance than the brick ones.On the other hand,they require less repair than the steel chimney at later stage.Therefore,the selection of reinforced concrete chimneys is more common in China.In the construction of towering reinforced concrete chimneys,a construction platform which rises synchronously with the chimney should be set up no matter what kind of construction technology is used.In practical engineering,the design of the construction platform often simplifies to the calculation of flat static structure.However,during the actual construction process,the support point of the radiation beam supported by the construction platform is constantly moving to the center of the platform with the increasing height of,which equivalent to the platform support is constantly changing.And because of the wind load and the construction materials,as well as the placement of equipment,the platform structure can’t be uniformly stressed.So that the platform will be difficult to adjust the deformation and displacement,and even affect the construction safety of platform.So if only to simplify the construction of the platform into statically determinate structure,the calculation results cannot reflect the whole construction process of the construction platform at the real stress state,so that it lacks of reliable theoretical basis in the process of design,installation,slippery rise of platform.Based on the exhaust tower engineering project which involves 200 thousand tons /year functional,differential viscose staple fiber in Tangshan Sanyou Yuanda Fiber Co.Ltd.,stress monitoring was carried out to sliding mode radiation beams of platform in the process of construction,and make further simulation and analysis to the chimney sliding construction platform in whole process.By comparing the field monitoring results and the simulation values in each construction stage,the operability and feasibility of stimulating ofthe stress state of the main parts of the platform during the construction process which used numerical simulation method has been verified,as well as the necessity and importance of construction monitoring during the construction process.On the basis of monitoring results and finite element simulation analysis,respectively probe the influence to the construction platform which caused by inhaul cable,portal frame,platform steel ring and surcharge.Therefore propose an optimization method of construction of the platform structure.At last,the author puts forward some suggestions and prospects on the further study of sliding mode platform.