Research on Flexural Performance of Steel-Wood Composite Beams with Prestressed Web Holes
[Purposes]This paper aims to study the deformation and mechanical properties of external pre-stressed steel-wood composite beams with web holes under four-point bending static load.[Methods]Three-dimensional solid model was established by finite element ABAQUS to study the influence of pre-stressed steel strand layout and hole shape on the stiffness,deformation and bearing capacity of compos-ite beams.[Findings]The results show that the stiffness and bearing capacity of the composite beam can be significantly improved by setting prestressed steel strand,and the initial stiffness and yield bearing ca-pacity of the curved beam can be increased by 41%and 25%respectively,followed by the effect of the straight beam.Stress concentration and large deformation are easy to occur at the opening in the span of composite beams without prestressing.The shape of the hole can redistribute the stress in the area of the hole,the plastic hinge is easy to appear on both sides of the bottom of the rectangular hole,the phenom-enon of the square hole is partially improved,and the obtuse angle at the bottom of the round hole is easy to occur stress concentration and deformation.[Conclusions]Selecting the proper layout of the pre-stressed steel strand and the shape of the opening area can significantly improve the stiffness and bearing capacity of the steel-wood composite beam with web holes and reduce the degree of deformation.
steel-wood composite beamswebholesexternalprestressingnonlinear finite element
万方数据
维普
