In order to improve the load-carrying capacity of LQ550 high strength continuous purlin with cold-formed thin-walled C-section,a novel embedded strengthening technique was introduced to reinforce the continuous purlins near the supports.A total of seven groups of continuous purlin specimens including those with two different embedded strengthening forms were tested subjected to three-point loading,and the load-carrying behavior and the failure modes were obtained.The experimental results show that the strengthened purlins displayed two local buckling failure modes including the one at mid-span and the other adjacent to the strengthened segment.A nonlinear finite element(FE)model was established using the ABAQUS software and was used to reproduce the load-carrying behavior of the tested continuous purlins.The numerically predicted failure mode and load-carrying capacities were in good agreement with the test results,enabling the validation of the developed FE model.Using the validated FE model,the influences of the two embedded strengthening techniques and the strengthening length on the load-carrying capacity of purlins were examined.It has been demonstrated that the strengthening length of continuous purlins can be taken as 1/5～1/4 of the span.
high strength steelcold-formed thin-walled C-sectioncontinuous purlinembedded strengtheningload-carrying behavior
NETL
NSTL
维普
万方数据
