Analysis Of The Structural System Of Double Large-span Connected Structure Of The Library In Binhai Culture Center

The main structure of the library in Binhai Culture Center uses the structural system of large-span connection-concrete filled steel tube column-steel beam frame brace.Its structure form is very complex and it has large size.Design and deep analysis were carried out on the structure to get a series of calculation results of relevant indicators,which could make sure the security and normal use of the structure.What’s more,the experience can provide the reference to the design of other similar projects in the future.Firstly,the research status of composite steel frame-support system and large-span conjoined structure as well as the common forms of rigid joints of composite structure were recommended.These introductions provided the theoretical foundation for the design and analysis of this project.The engineering background and design basis of the topic were introduced in detail and the main research contents were put forward.The structural system of Binhai library is complex,and it was detailedly introduced in this paper.The load value and selection of components were given.This structure has some indicators exceeding the norms and a certain treatment measures have been used to solve the problem.At last,according to the relevant specification,the Seismic performance objectives of this project were put forward.Two softwares were used to analyze the Basic static and dynamic performance of the structure,including stress,deformation,interlayer displacement angle,shear-weight ratio and so on.Because of the existense of large-span conjoined,the research of temperature effect was carried out.Analysis on comfort level of the floor was also conducted.Results showed that the indicators of the structure could meet the specification requirements.Dynamic elastic time history analysis was carried out for supplement calculation of vibration mode decomposition response spectrum method.The results of elastic time history analysis were less than that of vibration mode decomposition response spectrum method,so the structure could be designed as the vibration mode decomposition response spectrum method.Dynamic elastic-plastic time history analysis and static elastoplastic pushover analysis were conducted to analyze the capacity of the structure to resistance severe earthquake.Results showed that the indicators could satisfy the requirements for seismic resistance and norms,so the structure can meet the seismic performance objective of no collapse when severe earthquake.Because of the existense of large-span conjoined,the vertical component of the structure is relatively few.So the nonlinear dynamic alternate path method was used to analyze the continuous collapse resistance of the structure.44 columns on the first layer of underground and the ground layer were dismantled.Results showed that the column demolition couldn’t cause the progressive collapse,and the ability of resisting progressive collapse of the Binhai Library was great.Finite element simulation analysis on three key connections of the structure was carried out.The test data of similar connection conducted by predecessor was used to verify the correctness of the simulation.Results showed that these three key connections could keep elastic when design earthquake,which could ensure the safety and reliability of the structural connection.