|Table of Contents|

Mechanical Mechanism of Steel-glulam Connections with Teeth on Splints(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2020年04期
Page:
60-68
Research Field:
Publishing date:

Info

Title:
Mechanical Mechanism of Steel-glulam Connections with Teeth on Splints
Author(s):
YU You-sheng1; 2;  ZHOU Qi-lin1;  HAN Jun-liang1
(1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China; 2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone, Qingdao University of Technology, Qingdao 266033, Shandong, China)
Keywords:
glulam reticulated shell;  steel-glulam connection with teeth on splint;  mechanical mechanism;  monotonic load;  failure mode
PACS:
TU366
DOI:
10.19815/j.jace.2019.05065
Abstract:
In order to solve the problems of low initial stiffness of bolted connections in glulam reticulated shells and easy splitting of bolt holes in glulam beams, a kind of steel-glulam connection with teeth on splints was proposed. The mechanical properties and failure modes of the connection with teeth on splints(JD-2)under monotonic load were studied by test and compared with the ordinary connection(JD-1)without teeth on splints under the same size. In order to study the stress mechanism of the splint connections with teeth, the finite element simulation of the connections was carried out. The results show that the failure mode of JD-1 is the transverse splitting along the horizontal direction of bolt holes in glulam beams, and that of JD-2 is yield failure of the splints. Compared with JD-1, the initial stiffness, ultimate bearing capacity and ductility of JD-2 are increased by 47.18%, 31.4% and 19.83% respectively. The mechanical biting effect between steel teeth and glulam beams can effectively reduce the adverse effect of the initial clearance of bolt holes on the stiffness of connections. Under the combined action of bending and shearing, the load is transmitted to the glulam beam through the steel teeth and bolts, which can reduce the stress around the bolt holes and delay the cracking of the bolt holes in the glulam beam. With the increase of the thickness of the splint flange, the flexural behavior of the connections tends to increase. With the increase of steel teeth ratio, the stress of the bolt holes of glulam beams is reduced by the extrusion of the bolt, and the ability of steel teeth to prevent the relative sliding between splint and glulam beams is enhanced. It is suggested that the steel teeth ratio is 0.46%-0.65%.

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Last Update: 2020-07-29