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Experiment on Behavior of Composite Square Grout-filled Pipe Splice(PDF)

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

Issue:
2020年02期
Page:
54-61
Research Field:
Publishing date:

Info

Title:
Experiment on Behavior of Composite Square Grout-filled Pipe Splice
Author(s):
DAI Shao-bin1; 2;  ZHENG Xiao-lin1;  HUANG Jun1; 2;  LI Yu-bo1;  LIU Xuan1
(1. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China; 2. Design & Research Institute Co., Ltd of Wuhan University of Technology, Wuhan 430070, Hubei, China)
Keywords:
square steel pipe;  spiral stirrup;  composite sleeve;  embedded length;  bond strength
PACS:
TU375.1
DOI:
10.19815/j.jace.2019.01041
Abstract:
Considering the problems of sleeve processing technology, materials, cost and etc., a new type of combined square grouting sleeve was proposed. The sleeve was assembled by standard seamless square steel pipe, ribbed steel bar and spiral stirrup. Using the combined square sleeve, nine joint specimens with a diameter of 7.5 times to 12.5 times the anchor length were fabricated, and the tensile properties and working mechanism of the joint were studied by the axial incremental tension test. The results show that all the test pieces are broken off somewhere outside the joint, and the ratio of the tensile strength of the joint to the standard value of the tensile strength of the steel bar is greater than 1.10, which satisfies the requirements for the tensile strength of the joint of Ⅰ grade in JGJ 107—2010. The condition can be satisfied when the anchor length of the piece reaches 7.5d(d is diameter of connecting steel bar). The welded steel bars embedded in the four corners of the sleeve cavity and the spiral stirrups have an important influence on the confinement mechanism and strain distribution of the sleeve. The embedded welded steel bars can bear part of the tensile force transmitted from the joint, thereby reducing the stress on the surface of the square steel pipe. The transverse rib on the surface of the welded steel bar can effectively increase the bonding force between the inner wall of the sleeve and the grouting material; the hoop can further restrain the grouting material to improve the integrity of the joint; the surface strain of the sleeve is evenly distributed, and the strain inversion caused by deformation of the section processing does not appear.

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Last Update: 2020-04-21