Proceedings of the Cold-Formed Steel Research Consortium Colloquium 17-19 October 2022 (cfsrc.org) Fatigue Performance of Shear Connections between CFS Sheets using Self-Tapping Screws and Rivets Ya-Qian Wang 1 , Yuan-Qi Li 2 Abstract In this paper, experimental study on the fatigue performance of CFS sheets using self-tapping screws and rivets is presented and compared. Based on the fatigue test data, the fatigue life for CFS sheets using self-tapping screws and rivets was predicted, respectively. The results indicated that the fatigue limit of the shear connections (0.8/0.8) using self-tapping screws and rivets is respectively 33% and 36% lower than the design value provided in the code (AISI S100-16). And the fatigue performance of self-tapping screw shear connection and rivet shear connection is similar due to almost similar failure modes of connected sheets around the holes. Under a 95% survival probability, the curve of self-tapping screw (0.8/0.8) and the curve of rivet (0.8/0.8) intersect at approximately 735000 cycles, and before this cycle number the fatigue strength of rivet connections is higher than that of self-tapping screw connections. For both of two connections, the larger the steel sheet thickness, the better the fatigue performance. In the future, the influence of different types steel sheet such as LQ550 series steel on the fatigue performance and difference between base materials and perforated sheet and screw or rivet connections are both worthy to be studied. 1. Introduction In recent years, with the development of intelligent construction and prefabricated structure, cold-formed Steel (CFS) has become one of the main materials for construction steel structure in the world, and is widely used in low-multistory industrial plants, residential buildings, prefabricated buildings and shelf structures. Cold-formed section steel is made of hot-rolled, heat-treated or cold- rolled strip steel, steel plate as blank, then they are bent (folded) at room temperature, finally forming various section shapes and sizes of section steel. Compared with hot rolled section steel, cold bending effect, heat treatment effect and high residual stress of cold -formed section steel should be considered in engineering application due to its different production process. Self-tapping screws and rivets connections are common connection type for cold-formed steel. They are rather simple to assemble even in challenging conditions and only are used to connect sheet. At the same time, it is possible to occur fatigue problems. Fatigue damage has no obvious plastic deformation, and sudden damage often lead catastrophic accidents, causing huge economic losses. However, the fatigue design of the two type connections is currently regulated only in the American standards [1]. Therefore, the research on the connection fatigue performance will provide technical support for the promotion and application of cold-formed steel in the field of building 1 PhD Student, Department of Structural Engineering, Tongji University, [email protected] 2 Professor, Department of Structural Engineering, Tongji University, [email protected] steel structure, and is of great significance to the future development of cold-formed steel. Antonio et al. [2]studied the fatigue performance of roofing panels connected by cold-formed steel self-tapping screws and applied the dynamic loading protocol to the test to simulate wind load. The influence factors such as thickness of steel plate, type of profile steel plate, wave distance, tapping screw connection (including wave peak connection, wave valley connection and pad connection) were considered in the test. On the basis of Antonio’s study results, Osvaldo et al. [3] conducted a finite element simulation study of cold-formed steel self-tapping screw connected roof panels, and compared the results with the test results, then proposed a simple criterion that can be used to simulate fatigue failure. Kathekeyan [4] designed three types of scale fatigue tests for fatigue failure of cold- formed steel roofing panels connected with self-tapping screw, and compared with the results of full-scale test [5], then analyzed the feasibility of scale tests and proposed a simple fatigue design formula. The ultimate goal of fatigue analysis is to estimate the fatigue life of the structures or components. According to connection classification obtained from standards for structural design and allowable stress amplitude, fatigue life can be calculated. In this paper, the fatigue performance test of self-tapping screws and rivets connections was carried out. Using test data, the S-N curve was fitted. Through the
Fatigue Performance of Shear Connections between CFS Sheets using Self-Tapping Screws and Rivets
Apr 28, 2023
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Related Documents
