Stability Behavior of Perforated Lipped Channel Columns

MATEC Web of Conferences, Jan 2016

Taking the cold-formed thin-walled perforated lipped channels with simple edge stiffeners and complex edge stiffeners as research objects. The influence of perforated parameters, such as hole width, hole height, hole shape and hole spacing, on axial compressive bearing capacity and buckling mode of these two types of lipped channels were studied by finite element analysis. It shows that the change of hole width, hole shape and hole spacing may change the buckling mode, but influence little on ultimate bearing capacity within a reasonable perforated range; However, it indicates that the ultimate bearing capacity decreased obviously with the opening height increased. The suggestions on reasonable hole shape and hole size were put forward. Furthermore, combined the direct strength method of lipped perforated channels under axial compression abroad with the relevant specification of our country, the direct strength method of lipped perforated channel columns for our country were put forward also. Then, the methods mentioned above were extended to calculate the ultimate bearing capacity of perforated channels with complex edge stiffeners under axial compression, and the validity of the formulas was verified.

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Stability Behavior of Perforated Lipped Channel Columns

MATEC Web of Conferences Stability Behavior of Perforated Lipped Channel Columns Chungang WANG 0 Yu BAI 0 Qingqing LIU 0 Daqian ZHAO 0 0 Shenyang Jianzhu University , Shenyang, Liaoning China Taking the cold-formed thin-walled perforated lipped channels with simple edge stiffeners and complex edge stiffeners as research objects. The influence of perforated parameters, such as hole width, hole height, hole shape and hole spacing, on axial compressive bearing capacity and buckling mode of these two types of lipped channels were studied by finite element analysis. It shows that the change of hole width, hole shape and hole spacing may change the buckling mode, but influence little on ultimate bearing capacity within a reasonable perforated range; However, it indicates that the ultimate bearing capacity decreased obviously with the opening height increased. The suggestions on reasonable hole shape and hole size were put forward. Furthermore, combined the direct strength method of lipped perforated channels under axial compression abroad with the relevant specification of our country, the direct strength method of lipped perforated channel columns for our country were put forward also. Then, the methods mentioned above were extended to calculate the ultimate bearing capacity of perforated channels with complex edge stiffeners under axial compression, and the validity of the formulas was verified. 1 Introduction Cold formed thin-walled steel is widely used in all kinds of industrial and civil buildings for its flexible cross section form and efficient structural characteristics. In order to facilitate the installation of circuit system and pipeline facilities, holes are usually set up on the web of cold-formed thin-walled steel members in practical engineering application. But the existence of holes can affect the stability and bearing capacity of the members, even change the buckling modes. And the calculation method of bearing capacity becomes more complicated. The current direct strength method (DSM) is no longer suitable for the perforated members. Therefore, it is necessary to carry out the relevant research on cold-formed thin-walled perforated lipped channels under axial load. For perforated lipped channels and complex lipped channels pin-ended columns, the influence of perforated parameters on bearing capacity and buckling mode has been studied. And combined the direct strength method of perforated common lipped channels under axial compression abroad with the relevant specification of our country, the direct strength method of perforated common lipped channel columns for our country were put forward in this paper. Then the methods mentioned above were extended to calculate the ultimate bearing capacity of perforated channels with complex edge stiffeners under axial compression, and the validity of the formulas was verified. 2 The Influence Factors of Stability Element Parametric Analysis Performance by Finite The accuracy of simulating method has been validated by preliminary study [1]. The paper uses the same finite element analysis method to study the influence of hole width, hole height, hole shape and hole spacing on bearing capacity and buckling mode of lipped and complex lipped perforated channels. The reasonable hole shape and hole size are put forward. There are 50 lipped perforated channels and 58 complex lipped perforated channels. The cross section forms used for analysis are showed in Fig.1. In the specimen label, L and the number then represents effective length; Ja and the number then means the serial number of lipped perforated channels and Jb means complex lipped channels(Table 1); the letter b and then means the width of hole; the letter h and then means the height of hole. When there is a single hole in the web, the hole in the specimen length 1/2; there are two holes, the holes in the specimen length 1/3. The hole spacing l means the distance between the center of holes. The web holes sizes parameters are showed in Fig2. B t d H H B t a d (a) lipped channel (b) complex lipped channel Fig.1 Cross section of specimen H h l L b b Specimen Ja1 Ja2 Ja3 Ja4 Ja5 Ja6 Ja7 Ja8 Ja9 Ja10 Jb1 Jb2 Jb3 Jb4 Jb5 Jb6 Jb7 Jb8 Jb9 Jb10 Jb11 Jb12 Jb13 Jb14 2.1 The hole width The results of finite element analysis are showed in Table 2. The bearing capacity of specimen decreases with the increase of hole width, but the amplitude is very weak. From Table 2, it’s obvious that the influence of the width of hole on the buckling mode of members is very small. It is suggested that the hole width of the cold-formed channel under axial compression is 110mm. 2.2 The hole height As shown in Table 3. The ultimate bearing capacity of the member is obviously decreased with the increase of the height of the hole and the influence of the hole height on the stability of the bearing capacity is large. In order to find a more economical and reasonable hole height range, the ratio of bearing capacity of (...truncated)


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Chungang Wang, Yu Bai, Qingqing Liu, Daqian Zhao. Stability Behavior of Perforated Lipped Channel Columns, MATEC Web of Conferences, 2016, 67, DOI: 10.1051/matecconf/20166703011