|Table of Contents|

Monotonic Tensile Test of Spliced 8.8-grade Jointed Bolts(PDF)

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

Issue:
2020年04期
Page:
69-77
Research Field:
Publishing date:

Info

Title:
Monotonic Tensile Test of Spliced 8.8-grade Jointed Bolts
Author(s):
YANG Ou;  PENG Zhao-jun;  LIU Yan-zhi;  KANG Li-jing
(College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China)
Keywords:
8.8-grade bolt;  jointed bolt;  steel thread sleeve;  tensile test
PACS:
TU398
DOI:
10.19815/j.jace.2019.07021
Abstract:
In order to study the tensile behavior of the spliced anchor bolt by connecting two 8.8 grade bolts with steel thread sleeve, tensile tests were carried out on 12 groups of 36 grade 8.8 spliced anchor bolt specimens to determine the connection length of bolt and steel thread sleeve with different diameters, and then determine the length of steel thread sleeve with different diameter anchor bolts. In order to determine the influence of sleeve connection, tensile tests were carried out on 12 grade 8.8 bolts in 4 groups, and the results were compared with the test results of spliced anchor bolts. The results show that when the bolts diameter d=16 mm, and the connection length between the two screws and the steel thread sleeve is 0.75d(screwed into sleeves 7 buckles), the failure of the specimens is that the bolts are pulled out from the steel thread sleeve, and the rest of the spliced anchor bolt specimens are damaged by the failure of the bolt outside the sleeve. The average extrusion stress, average shear stress and average bending stress of screw threads of specimens with different diameters, different pitches have little difference at the same connection length, which indicates that, within the range of the connecting length of the screw and the steel thread sleeve, the magnitude of the three stresses is only related to the connection length for multiples of diameter. The smaller the length of one-sided connection of the same diameter screw, the better the tensile deformation ability and ductility of the splice anchor bolt, so it is suggested that the length of one-sided connection between screw and sleeve is d(16, 20, 24 mm diameter screws screwed into sleeves 9 buckles, 27 mm diameter screws screwed into sleeves 10 buckles), which can not only ensure that the screw is not pulled out of the sleeve, but also has good ductility. The tensile strength of the single bolt is slightly higher than that of the spliced anchor bolt, but the stiffness of the spliced anchor bolt is slightly degraded when compared with the single bolt.

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Last Update: 2020-07-29