Pull-out behavior of inorganic-bonded bamboo composite connections with glued-in rod

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-03-28 DOI:10.1016/j.conbuildmat.2025.140998

Ernian Zhao , Shaohua Yu , Fei Wang , Xin Zhang , Chao Yang

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引用次数: 0

Abstract

Inorganic-bonded bamboo composite (InorgBam) is a new engineered bamboo composite material made of bamboo fiber strips and magnesium oxysulfide (MOS) inorganic adhesive. With advantages of high strength, high stiffness, and excellent fire resistance, glued-in rod (GiR) connections serve as the primary connection form in modern engineered bamboo and wood structures. To study pull-out behavior of GiR in InorgBam, pull-out tests were conducted in two grain orientations: parallel- and perpendicular-to-grain. Effects of threaded rod grade, anchorage length, and edge distance on failure mode, pull-out load-carrying capacity, and ductility of GiR connections were analyzed. Results revealed that specimens exhibited four failure modes: shear failure of InorgBam around adhesive, bonding failure at InorgBam-adhesive interface, splitting failure and threaded rod yield. GiR specimens with insufficient edge distance exhibited characteristics of splitting failure parallel-to-grain. Therefore, it is recommended that the edge distance of the GiR connections in InorgBam be no less than six times the rod diameter (6d). GiR specimens perpendicular-to-grain demonstrated higher load-carrying capacity than those parallel-to-grain. For specimens without rod yield failure, load-carrying capacity increases linearly with increasing slenderness ratio of rod. The average bond strength of GiR specimens parallel- and perpendicular-to-grain is 6.55 MPa and 8.63 MPa, respectively. Finally, the bond stress-slip relationships of GiR connections in InorgBam were derived from test results according to existing bond stress-slip models, and a calculation formula for pull-out load-carrying capacity was then proposed for GiR connections in InorgBam.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.