Test Investigation on Stiffness Performance of Steel Structures Composed of Cold-roller-bent Pipes

摘要

Curve-shaped roofs and facades are popularly used in the construction with roller bent pipe,which serves as structural element.Roller bent pipe are manufactured from straight pipe by a process called roller bending.The material is cold worked during forming,inducing a new distribution of mechanical properties across the section which is different compared to its original state.For a long time,original mechanical properties of the straight material are used in the design of curved structure.The influence of the roller bending process is usually ignored non-conservatively.Theoretically,cold-working makes the strength increased while the modulus decreased.The results of a series of tests and measuring investigation of the mechanical properties of cold-roller-bent pipes are present in this paper.The decreased modulus of cold-roller-bent pipes have significantly softened and weakened the overall mechanical properties of structures.The influence should be considered in the design of structures composed of cold-roller-bent pipes.