Experimental study on axial performance of steel honeycomb sandwich cold-formed steel composite walls
In order to study the axial behavior of honeycomb sandwich cold-formed steel composite walls,the influence of various parameters,including changes in the sandwich types(steel honeycomb core,OSB board sandwich or no sandwich),the stud section types(stiffened section or non-stiffened section)and the presence or absence of sheathings,on the bearing capacity and failure mode of walls were analyzed.Axial compression tests were conducted on eight walls and finite element simulation verification was carried out.It is shown that OSB board sandwich walls all fail in global buckling,while steel honeycomb sandwich walls all fail in local buckling.Compared with OSB board sandwich composite walls,the axial compression bearing capacity of steel honeycomb sandwich walls with or without sheathings is higher,and the increase ratio is 5.4％and 39％respectively.The steel honeycomb sandwich composite wall with web stiffened studs has a bearing capacity approximately 30％higher than that of the non-stiffened stud wall under the same conditions.In addition,the web thickness equivalent method was adopted and the lateral support effect of the sheathing and the sandwich was included in the direct strength method in the form of equivalent spring stiffness,and then a study on the calculation method of the axial compression bearing capacity of the composite wall was carried out.By comparing the experimental results and the theoretical results calculated by using the direct strength method,it is found that the prediction is quite accurate for non-stiffened stud walls(with an average ratio of 0.989 between the test result and theoretical result),while the load capacity of the web stiffened stud walls is overestimated(with an average ratio of 0.866 between the test result and theoretical result).The load-carrying capacity of steel honeycomb sandwich composite walls with web stiffened studs was predicted by a modified direct strength method and the predictions was found in good agreement with the test and finite element simulation results,with the average error not exceeding 3％.
万方数据
维普
