Session Start Date

11-6-2014

Session End Date

11-6-2014

Abstract

Lapped joints of cold-formed steel (CFS) Z-shaped purlins are extensively used in metal building roof systems. The research that has been carried out so far for these lapped connections is primarily focused on connections with round holes. However, the lapped connections with vertical slotted holes are extensively used in current construction practice to simplify the erection of continuous Z-shaped roof purlins. There are no design guidelines or recommendations available for CFS Z-purlin lapped connections with vertical slotted holes.

Presented in this paper are the results of an experimental study on the structural strength behaviour of lapped CFS Z-shaped purlin connections with vertical slotted holes. A total of 42 flexural tests were performed on lapped CFS Z-shaped purlins with vertical slotted holes in different lap lengths, purlin depths, thicknesses and spans. The flexural strength and deflection of each specimen were measured. The characteristics of moment resistance were computed. The test results indicate that the characteristics of moment resistance in the slotted connections are dependent on the ratio of lap length to purlin depth and ratio of purlin depth to purlin thickness. Based on the results, design recommendations for evaluating the moment resistance of lapped slotted connections are proposed.

Department(s)

Civil, Architectural and Environmental Engineering

Research Center/Lab(s)

Wei-Wen Yu Center for Cold-Formed Steel Structures

Meeting Name

22nd International Specialty Conference on Cold-Formed Steel Structures

Publisher

Missouri University of Science and Technology

Publication Date

11-6-2014

Document Version

Final Version

Rights

© 2014 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Structural Strength of Lapped Cold-Formed Steel Z-Shaped Purlin Connections with Vertical Slotted Holes

Lapped joints of cold-formed steel (CFS) Z-shaped purlins are extensively used in metal building roof systems. The research that has been carried out so far for these lapped connections is primarily focused on connections with round holes. However, the lapped connections with vertical slotted holes are extensively used in current construction practice to simplify the erection of continuous Z-shaped roof purlins. There are no design guidelines or recommendations available for CFS Z-purlin lapped connections with vertical slotted holes.

Presented in this paper are the results of an experimental study on the structural strength behaviour of lapped CFS Z-shaped purlin connections with vertical slotted holes. A total of 42 flexural tests were performed on lapped CFS Z-shaped purlins with vertical slotted holes in different lap lengths, purlin depths, thicknesses and spans. The flexural strength and deflection of each specimen were measured. The characteristics of moment resistance were computed. The test results indicate that the characteristics of moment resistance in the slotted connections are dependent on the ratio of lap length to purlin depth and ratio of purlin depth to purlin thickness. Based on the results, design recommendations for evaluating the moment resistance of lapped slotted connections are proposed.