Design method of high-strength steel cold-formed thin-walled C-shaped section component with holes in web
A cold-formed thin-walled, component design technology, applied in the direction of applying repetitive force/pulse force to test the strength of materials, pillars, piers, etc. question
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Embodiment 1～ Embodiment 11
[0047] Embodiment 1 to Embodiment 11: The basic dimensions, bearing capacity and failure mode of the test member The specific size parameters are as shown in Table 1. The cold-formed thin-walled C-shaped test member.
[0048] Table 1
[0049]
[0050]
[0051] The test method is as follows:
[0052] Mount and center the specimen before loading. In this test, a 500kN low-cycle reciprocating electro-hydraulic servo fatigue actuator is used for loading. The lower part of the actuator is equipped with a two-way hinge support to connect the upper end plate of the component, and the lower end of the component is installed on the spherical hinge support to meet the boundary conditions of both ends . Before loading, the steel plate is cut from the roll-formed test piece to make a standard tensile sample for material property testing. The yield strength of the LQ550 hot-dip galvanized steel plate for making the test piece is f y =648MPa, tensile strength fu=650MPa, Poisson's r...
Embodiment 12～ Embodiment 22
[0057] Embodiment 12-Example 22: Corresponding to Test Examples 1-11 respectively, the specific parameters and corresponding conditions are shown in Table 1.
[0058] The ultimate load value N of the member obtained by finite element simulation fu and the ultimate load value N obtained from the test eu The comparison is shown in Table 1. In the failure mode, L represents local buckling, D represents distortional buckling, and O represents overall bending buckling. Comparing the test results with the finite element simulation results, it can be found that the ultimate bearing capacity of the finite element is in good agreement with the test bearing capacity, and the maximum error does not exceed 5.44%. The finite element model simulation obtained by introducing the initial geometric defects of the measured components Comparing the failure mode with the test, it can be obtained that both the buckling mode and the deformation characteristics of the component are highly consisten...
Embodiment 23～ Embodiment 34
[0064] Example 23-Example 34: The cross-sectional profile size of the C-shaped cross-section member is 89mm×41mm×8mm×1mm. The finite element model analysis of the influence of the hole shape is studied. The relevant size parameters of the hole are shown in Table 2.
[0065] Table 2
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[0067] The unstable positions of the four types of members with different lengths obtained from the analysis, that is, the node displacement curves at the maximum deformation point are shown in the attached Figure 5(a)-Figure 5(d) , where Fig. 5(a) is the maximum total displacement-axial pressure curve of the node at the instability position of the components with different pass types in the component numbered A; The maximum total displacement-axial pressure curve of the node at the instability position of ; Fig. 5(c) is the maximum total displacement-axial pressure curve of the node at the instability position of the members with different pass types in the component numbered C;
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