Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (5): 1400-1410.doi: 10.13229/j.cnki.jdxbgxb.20210883

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Mechanical behavior on friction energy dissipation reduced beam section connection of steel beams

Wei-hua WANG1,2(),Yong-bin ZHU1,3,Shen-jun QI1,Jing-si HUO1,2(),Xiu-quan GUO1,2,Zhen-an ZHONG4   

  1. 1.College of Civil Engineering，Huaqiao University，Xiamen 361021，China
    2.Xiamen Engineering Research Center for Fire Resistance and Disaster Prevention，Huaqiao University，Xiamen 361021，China
    3.Fujian Yancheng Construction Engineering Co. ，Ltd. ，Xiamen 361016，China
    4.Xiamen Hansen Curtain Wall Decoration Engineering Co. ，Ltd. ，Xiamen 361009，China
  • Received:2021-09-07 Online:2023-05-01 Published:2023-05-25
  • Contact: Jing-si HUO E-mail:whwang@hqu.edu.cn;huojingsi@hqu.edu.cn

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Abstract:

A new Reduced Beam Section（RBS） connection of steel beams used high-strength friction bolts was investigated in this paper. A H-shaped shear key was designed as a horizontal plate at the midline of the web plate and the steel beam under its midline. Lots of the resisting shear friction bolt groups at the web of the beam section were saved， and the H-shaped shear key could also be used as the landing platform for the purpose of fast installation when the steel beam was lifted in the air. Based on the experimental verification of the high-strength friction bolted connection of the H-shaped steel beams， the Finite Element Analysis models were built using ABAQUS software. Compared with the traditional steel beam connections， the bearing capacity process of the high-strength friction bolted RBS connection could be divided into four parts： elastic stage， sliding stage， strengthen stage and plastic stage， and two energy dissipation mechanisms were formed during the frictional sliding and plastic yield stages， respectively. The mechanical performance of the high-strength friction bolted RBS connection was analyzed with different parameters such as bolt pretension force， thickness of the connection plate and strength of the steel materials etc. The working mechanism and bearing capacity of the high-strength friction bolted RBS connection were analyzed in this paper. The bearing capacity and ductility of the high-strength friction bolted RBS connection was good， and the relocation of plastic hinge similar to the flange Reduced Beam Section steel beam was also found， the angular ductility factor increased from 1.7 to 12. The moment inter force at the beginning of frictional sliding was determined by the friction resistance capacity of the high-strength friction bolt groups at the steel beam flange， however， the bearing capacity during the plastic stage was relevant to the bolt strength， bolt diameter and the ultimate plastic moment of the steel beam.

Key words: steel structure, friction energy dissipation, reduced beam section steel beam, connection, mechanical behavior

CLC Number: 

  • TU391

Fig.1

Comparison between tested and FEA failure models"

Fig.2

Comparison between tested and calculated moment rotation curves"

Fig.3

Traditional connection using high-strength fraction bolts"

Fig.4

Friction RBS connection using high-strength fraction bolts"

Fig.5

Specimen size in detail （B-100）"

Table 1

List of specimen parameters"

试件名称翼缘螺栓 预紧力/%盖板厚度 /mm钢材强度翼缘厚度/mm
B-1001006Q34512
B-80806Q34512
B-60606Q34512
B-80Q235806Q23512
B-60Q235606Q23512
B-100Y141006Q34514
B-80Y14806Q34514
B-60GH4604Q34512
B-60GH8608Q34512
CT-1001006Q34512
CT-80806Q34512
CT-60606Q34512
RBS//Q34512

Table 2

Material performance"

材料名称E/105MPaυσy /MPaεy /10-2
梁柱板材2.060.33450.17
梁柱板材12.060.32350.11
高强螺栓2.060.39400.46

Fig.6

Finite element model of the friction RBS connection"

Fig.7

M-θ curve with different pretension of bolts"

Fig.8

Comparison between the failure modes"

Fig.9

M-θ curves under different pretension"

Fig.10

Comparison between the failure modes"

Fig.11

Comparison between M-θ curves of different connection types"

Fig.12

Stress distribution at the ultimate state of bearing capacities"

Fig.13

M-θ curves among different parameters"

Table 3

Ductility indexes of specimens"

试件名称

屈服弯矩My

/（kN?m）

屈服转角θy

/rad

极限弯矩Mu

/（kN?m）

极限转角θu

/rad

延性系数μ
B-100140.150.012153.280.0312.50
B-80124.080.012151.210.1109.17
B-6096.930.010153.280.12012.00
RBS119.100.010126.190.0171.70
B-60GH499.940.013126.350.1209.23
B-60GH897.900.010149.330.11011.00
B-100Y14146.020.013170.720.1007.69
B-80Y14124.060.011170.570.11011.00
B-80Q235100.900.009105.470.0353.89
B-60Q23596.600.012105.140.1109.17
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