|Table of Contents|

Experimental study on rebar mechanical connection performance of steel plate composite blind bolts under high stress repeated tension-compression load(PDF)

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

Issue:
2023年05期
Page:
108-118
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study on rebar mechanical connection performance of steel plate composite blind bolts under high stress repeated tension-compression load
Author(s):
DUAN Liusheng1;  ZHANG Huabing1;  DING Taotao1;  ZHOU Youli1;  WU Nan1;  PAN Hong2;  XIA Minggan3;  LI Hui4
(1. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. Western Architectural Seismic Survey, Design and Research Institute Co., Ltd, Xi'an 710054, Shaanxi, China; 3. China National Chemical Urban Investment Co., Ltd., Xi'an 710054, Shaanxi, China; 4. China Jikan Research Institute of Engineering Investigations and Design, Co., Ltd, Xi'an 710043, Shaanxi, China)
Keywords:
anchorage length;  rebar mechanical connection;  high-strength bolt;  high stress repeated tension-compression;  connection performance
PACS:
TU398
DOI:
10.19815/j.jace.2022.01014
Abstract:
Aiming at the problem that the diameter of precast concrete slab rebar was small and the grouted sleeve cannot be directly used to complete the rebar connection during assembly, a high-strength steel plate composite blind bolt rebar mechanical connector was proposed, which can realize equal-strength connection of rebars only from the surface of the slab. In order to study the mechanical property and working mechanism of steel plate composite blind bolts rebar mechanical connector under seismic action, high stress repeated tension-compression test and uniaxial tensile test were performed on 2 groups of 6 specimens, and the failure mode, strain of the connecting steel cover along the length and width directions, axial strain of high-strength bolt and the strain of slotted rebars were mainly investigated. The results show that under the same anchorage length, there is no obvious difference between the final failure mode and ultimate bearing capacity of the two groups of specimens, but there is a certain difference in joint deformation performance, the displacement corresponding to the ultimate load in the high stress repeated tension-compression test increases by about 32%, and the displacement increases by about 24% when it is broken. There is no obvious difference in the load-strain curve between the rebar in the anchorage zone and the rebar at the splice end. The high stress repeated tension-compression has basically no effect on the axial strain and transverse strain characteristics of the steel cover. At the end of the high-stress cycle, the compressive strain of the high-strength bolt increases by about 30×10-6. The cyclic action has little effect on the bolt pre-tightening force. The average values of the yield ratio, strength ratio and ductility ratio of the specimen are 1.07, 1.56, and 7.92, respectively. The specimen with an anchorage length of 3d(d is the nominal diameter of connecting rebar)is pulled out, and the structure of the connecting nails can be optimized by reducing the nail spacing and increasing the occlusal surface to improve the anchorage performance.

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Last Update: 2023-09-01