Super Long And Large Span Structure Analysis Method And Design Process Study For Marine-science Museum Project

With the steady development of national economy,more and more buildings with different shapes and asymmetrical planes are to emerge.Because large public buildings are often designed into large-span space structures due to the requirements of building functions and limited by the requirements of service conditions,they fail to set sufficient expansion joints at the spacing required by current codes to form super-long structures.Super-long and large-span structure have become a common busuness in daily structural design work,which brings great challenges to structural designers and constructors.At present,there is little research on super-long and large-span by experts and scholars,and has no relatively perfect solution for structure engineer.This paper takes structural design of Zhuhai Chimelong Marine Science Museum as an actual engineering case,elaborates the general analysis thoughts and design methods of super-long and large-span structure design.It is in order to provide a relatively perfect solution for other super-long and large-span structure design under the current situation that experts and scholars have little research on super-long and large-span structure.This paper takes the difficulties and innovative approaches in the structural design process of Zhuhai Chimelong Marine Science Museum as the research background and carries out the following research work.(1)In this paper,the research status of super-long and large-span design is firstly elaborated,and the engineering overview of this case-Zhuhai Chimelong Marine Science Museum is introduced.In combination with the current national building structural design code,the over-limit structure with several irregular indexes such as partial discontinuity of floor slab,irregular lateral stiffness and irregular plane shape is analyzed in detail,and specific structural reinforcement measures and structural measures are put forward according to the analysis results.(2)Through analysis of super-long-span concrete beams and comparison of their structural schemes,it is finally determined that the deflection problem of super-long-span concrete beams is solved by applying pre-stress.In the process of force analysis,in order to avoid the complicated working condition of large-span beam,innovative structural schemes such as double beam are adopted to guide the stand load well,which avoids the problem that the stress condition of large-span beam is too complicated.In this paper,the design method of the pre-stressed concrete beam and the precautions when adopting the pre-stressed technology are analyzed in detail.The measured data prove that the method of applying pre-stress has very good control effect on the deformation of concrete beam.(3)By calculating the change of internal force of structure under temperature with finite element software,the influence of super-long structure on overall structure under temperature stress is analyzed,and the cause of non-structural crack development is analyzed.On this basis,the corresponding measures should be taken in the whole process from the use of raw materials,design stage and construction stage to avoid the development of cracks and ensure the durability of buildings.