China
Africa
Explore chapters and articles related to this topic
Joining processes (mechanical connections)
Published in Roger Timings, Fabrication and Welding Engineering, 2008
A self-tapping screw, as its name implies, cuts its own thread in a hole of suitable diameter punched or drilled in sheet metal. Figure 9.13 shows two types of self-tapping screw. Figure 9.13(a) shows a suitable type for fastening thin sheet to a thicker section. Figure 9.13(b) shows a suitable type for joining thin sheets of metal. In both cases the top sheet has a clearance hole. Figure 9.13(c) shows how a greater depth of thread can be achieved by dimpling the hole in the bottom sheet.
Experimental Study of Solid and Hollow Clay Brick Masonry Walls Retrofitted by Steel Fiber-Reinforced Mortar Coating
Published in Journal of Earthquake Engineering, 2020
Luca Facconi, Fausto Minelli, Sara Lucchini, Giovanni Plizzari
Four types of masonry-to-coating connections were adopted to prevent buckling or delamination of coating during test. About SCB walls, the anchors (Figure 2) were placed in pre-drilled holes at 500 mm spacing both in horizontal and vertical direction in order to get a total of four anchors per square meter. The connection type A consisted of a 8 mm diameter (ϕ) threaded steel bar provided with a steel anchor. To ensure stress diffusion on the coating surface, a 50x50x10 mm3 steel plate was bolted to the steel bar and clamped on the external surface of coating (Figure 2). The connection type B was made of a 6 mm diameter self-tapping steel screw (Figure 3a) having a 25x25x0.6 mm3 steel fender washer placed in the middle of the coating thickness. The connection type C presented the same self-tapping screw adopted by the connection B but a larger (50x50x1.8 mm3) anchor steel plate. Finally, for the HCB walls, a nylon wall plug (commercially available) provided with a 6 mm diameter steel screw (Figure 3b) was used. The obtained connection, named as type D, had a 50x50x1.8 mm3 steel plate placed within the coating thickness.
Numerical analysis of seismic performance of cold-formed composite walls with one-sided straw-board cladding
Published in Journal of the Chinese Institute of Engineers, 2023
Xiuhua Zhang, He Ke, Mingxin Chi, Ruochen Wang
Owing to the failure phenomenon of the self-tapping screw connection between the wall panel and steel skeleton of CFSCW under horizontal low-cycle reciprocal loading. Therefore, FEA was performed on the composite walls with different peripheral self-tapping screw spacings. The self-tapping screw spacing was considered to be 100, 150, and 300 mm to study its effect on the seismic performance of CFSCW. As shown in Table 9, the characteristic values of the bearing capacity and corresponding displacement of each model at each stage were obtained.
Experiment and numerical analysis on flexural behavior of cold-formed thin-walled C-shaped steel-paper straw board composite floors
Published in Journal of Asian Architecture and Building Engineering, 2023
Xiuhua Zhang, Hang Li, Zilin Zhao
The simulation of the self-tapping screw between the CFCS frame and PSB was very important for FEA, and finally, the Combin39 spring element was used to simulate the effect of the self-tapping screw. The Combin39 spring element was arranged between the CFCS element and the PSB element, and the joints of the two materials with the same coordinates and different numbers were connected to simulate the interaction between the CFCS frame and PSB. The combin39 spring element is shown in Figure 11.