Experimental studies on fully demountable P-DBSCs shear connectors in sustainable reinforced concrete beam-slab

被引:0
|
作者
Li, Wei [1 ,4 ,5 ]
Fan, Haitao [1 ,3 ]
He, Song [1 ,3 ]
Lin, Xuchuan [6 ]
Chen, Lianmeng [1 ,3 ]
Lv, Hui [2 ,4 ]
机构
[1] Wenzhou Univ, Coll Civil Engn & Architecture, Wenzhou 325035, Peoples R China
[2] Nanchang Hangkong Univ, Sch Civil Engn & Architecture, Nanchang 330063, Peoples R China
[3] Key Lab Engn & Technol Soft Soil Fdn & Tideland Re, Wenzhou 325035, Peoples R China
[4] Nanchang Hangkong Univ, Smart Construct Res Ctr, Nanchang 330063, Peoples R China
[5] Wenzhou Chengjian Grput Co Ltd, Wenzhou 325000, Peoples R China
[6] China Earthquake Adm, Inst Engn Mech, Key Lab Earthquake Engn & Engn Vibrat, Harbin 150080, Peoples R China
关键词
Demountable RC beam; Push-out test; Shear performance; Reusability; Secondary loading; PERFOBOND RIB; BEHAVIOR; GIRDERS;
D O I
10.1016/j.istruc.2024.107134
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
To improve the increasingly serious environmental pollution and waste of resources in the construction of traditional buildings, a novel type of shear connector P-DBSCs (Demountable Bolted Shear Connectors with connection Plate) was designed. The shear performance of P-DBSCs in RC beam and slabs were comprehensively evaluated by seven push-out tests and secondary loading. The failure mode, load-slip curve, ultimate shear capacity and ductility of the specimens were carefully discussed. As illustrated by the experimental results, the failure mode of the 7 push-out specimens is bolt fracture with no obvious crack in the beam and slabs, and the demount-ability is excellent after failure. The ultimate slip of all specimens is greater than 6 mm, which meets the requirements of Eurocode 4. The ultimate strength of P-DBSCs shear connectors increased with the increase of steel box thickness and bolt diameter, it decreased with the increase of channel spacing. The ductility of PDBSCs shear connectors increased with the reducing of channel spacing and bolt diameter. Additionally, the shear performance of P-DBSCs is insensitive to the strength of concrete of slabs. After the first loading, the ultimate shear resistance; ultimate displacement and initial stiffness of the push-out specimen decrease slightly in secondary loading, but the influence code of each parameter remain constant. Finally, a comparison of ultimate strength between the calculated value and the experimental results showed that the theoretical values given by the Eurocode 3, Eurocode 4 and code AISC360-16 were higher than the experimental values, which indicated that the calculations overestimated the shear capacity of connection. Based on this, two formulae were proposed to predict the friction-type shear capacity and pressure-type shear capacity of P-DBSCs and the efficacy of the proposed design formula was proved by the comparison with the test results, which provides a research basis for such shear connectors.
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页数:18
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