Topology Optimization Of Beam Column Joints In Fabricated Steel Frames By Finite Element Method

At present,many countries are promoting the development of prefabricated buildings.Among various building structures,prefabricated steel frame structure has a great development prospect.The seismic damage of many times shows that the strength and stiffness of beam column joints play an important role in the reliability of steel frame structure.Most of the researches at home and abroad focus on improving the performance of joints.However,with the deepening of the concept of green sustainable development in China,it is more in line with the concept of green building to save materials,reduce costs and make the structure more economical,reasonable and high quality on the basis of ensuring its strength and stiffness.This dissertation mainly studies the topology optimization of beam column joints in prefabricated steel frame structures.The main research contents are as follows:Firstly,this dissertation introduced the main connection methods of the steel frame beam column joints at present,and analyzed the stress respectively,selected the bolt welded joint,which has the most advantage in the rigidity and strength.By comparing the checking calculation contents of the beam column joints in Chinese codes,the main contents of checking calculation of general beam column joints were obtained.Secondly,the topology optimization of beam column joints belongs to the topology optimization of continuum structure.In order to understand the optimization characteristics and optimization principles of topology optimization methods of continuum structure,several commonly used topology optimization methods were selected in a variety of topology optimization methods of continuum structure.Thirdly,in the follow-up,the topology optimization of bolted welded joints of beam and column in selected engineering cases was studied by finite element software.The main process includes: the three-dimensional model establishment and finite element analysis of the original beam column node,the stress cloud diagram and displacement cloud diagram of the common beam column node are obtained;the common beam column node is designed by topology optimization,and the lightweight design of the beam column node is realized by following the principles of "strong node weak component" and "strong column weak beam" under the condition of ensuring the strength and rigidity.Finally,the stress and displacement of the optimized beam column joints are compared with those of the ordinary joints.The results show that the topology optimization design can not only meet the strength and rigidity design of the joint,but also save the steel and reduce the cost by redistributing the material.The effectiveness and superiority of the topology optimization are verified,which provides a new idea for the optimization research of the beam column joints of steel frame.