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)