Study On The Connection Of Cold-formed Thin-walled Steel-Reconstituted Bamboo Box Section Composite Beam

Realization of strategic goals of environmental protection and sustainable development,green building has attracted more and more people’s attention.The cold-formed thin-walled steel-reconstituted bamboo box beam in this paper is a composite beam which has been widely used in recent years and has innovative section.So far,there are few researches on the end connection of this new composite structure,and no relevant specifications have been formulated.It is hoped that this study can provide some references for the future application of this new composite structure in engineering.This paper through the finite element analysis software to study the cold-formed thin-wall steel and recombinant bamboo box beam hinged at both ends,semi-rigid connection and ultimate bearing capacity and deformation under the condition of rigid connection,6 different sectional dimensions was established by finite element software cold-formed thin-wall steel and recombinant bamboo box beam under three kinds of end connection method of model,and considering the initial defects of the model.In this paper,the allowable load and ultimate bending capacity of mid-span deflection of cold-formed thin-walled steel-recombinant bamboo box beam are calculated by theoretical calculation method.Therefore,the accuracy of the finite element model constructed in this paper meets the requirements,and the model can be used for simulation.The effects of different end connections on the flexural capacity and deformation of the cold-formed thin-walled steel-reconstituted bamboo box beam are simulated by finite element software.The results show that the flexural capacity of composite beams increases with the increase of section size and the deformation decreases with the increase of section size,regardless of whether the composite beams are hinged at both ends,semi-rigid joints or rigid joints.Among the three end connection modes,the cold-formed thin-walled steel-reconstituted bamboo box beam has the maximum flexural capacity and the minimum deformation when both ends are rigidly connected,and the minimum flexural capacity and the maximum deformation when both ends are hinged.In engineering,composite beams can be used to improve their flexural capacity and control their deformation by means of rigid connections at both ends.