Effect of Non-Circular Web Opening Orientation on Shear Capacity of Lip Channel Beams (LCB)

Abstract: Cold-formed steel members are increasingly used as primary structural elements in building industry due to the availability of thin and high strength steels and advanced cold-forming technologies. Lip Channel Beam (LCB) is one of the commonly used cold-formed steel section, yet provision of web opening to facilitate various building services is fairly new concept. The main objective of this research was to investigate the effect of non-circular web opening orientation on the shear capacity of LCB sections. Currently there is no research knowledge or proper design rules to account for the orientation of web opening on the shear capacity of LCB sections. Hence a numerical study was undertaken to investigate the shear capacity of LCBs with non-circular web openings with different orientations. This paper presents the details of this numerical study on shear capacity of LCBs with non-circular web openings for different orientation.

Keywords: Lipped channel beam, shear capacity, finite element analyses, web opening,

1. INTRODUCTION

Figure 1 Application of Lip Channel Beams with Web Openings

2. CURRENT SHEAR DESIGN CRITERIA

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Vnl = qsVv (1)

(2)

0.38< (3)

(4)

(5)

(6a)

(6b)

(7)

(8)

(9)

(10)

(11)

(12)

(13)

(14)

(15)

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(17)

(18)

3. DEVELOPMENT AND VALIDATION OF FINITE ELEMENT MODEL FOR LCBs

WITH NON- CIRCULAR WEB OPENINGS

3.1. Development of finite element model

Figure 2 Geometry and Finite Element Mesh of LCBs with Web Opening

ux uy uz

ux uy uz

ux uy uz

Figure 3 Loads and Boundary Condition

ux

uy

uz

ux

uy

uz

ux

uy

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FEA failure modes

Experimental failure modes

3.2. Validation of finite element model

Figure 4 Failure Mode of 200×75×15×1.5 LCBs with Circular Web Opening

4. RESULTS AND DISCUSSION

4.1. Results of parametric study

4.2. Effect of non-circular web opening orientation on shear capacity of LCBs

Figure 5 Comparison of Relative Shear Capacity Reduction Factor (i.e. Ratio Relative to Zero Orientation) Versus Square Web Opening Orientation

Figure 6 Comparison of Relative Shear Capacity Reduction Factor (i.e. Ratio Relative to Zero Orientation) Versus Rectangular Web Opening Orientation

Figure 7 Comparison of Relative Shear Capacity Reduction Factor (i.e. Ratio Relative to Zero Orientation) Versus Elliptical Web Opening Orientation

Figure 8 Overall Comparison of Relative Shear Capacity Reduction Factor (i.e. Ratio With Zero Orientation) Versus Web Opening Orientation

Table 1 Comparison of FEA results with current design rules

5. CONCLUSION AND RECOMMENDATION

6. REFERENCES

Behaviour of Web Elements with Openings Subjected to Linearly Varying Shear

21st International Specialty Conference on Cold-formed Steel Structures

Thin-Walled Structures

Journal of Constructional Steel Research,

Thin-Walled Structures

Proceeding of 7th International Conference on Coupled Instabilities in Metal Structures

Thin-Walled Structures

Journal of Structural Engineering

Journal of Structural Engineering

Thin-Walled Structures