Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (10): 2376-2384.doi: DOI:10.13229/j.cnki.jdxbgxb20210255

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Mechanical performance of under⁃bridge connectors of cable⁃stayed system strengthened bridge

You-zhi WANG(),Wen-shuai ZHAO,Jin-zhang LIU,Kai QIU,Sen JIA   

  1. School of Civil Engineering，Shandong University，Jinan 250061，China
  • Received:2021-03-26 Online:2022-10-01 Published:2022-11-11

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Abstract:

The cable-stayed system reinforcement method has been applied to some projects in recent years. The joints under the bridge have the characteristics of bearing combined shear and compression loads， double-shear interface， bonded steel plate and anchored bolt mixed connection， etc. The mechanical properties and failure modes are not clear. An accurate finite element model of a connector under the bridge was established by Abaqus finite element method， and its mechanical properties and failure modes were studied. The results show that the final failure mode of each model is the bolt shear failure. The final failure position of the model is divided into two categories： the bolt shear failure at the glue layer and the bolt shear failure at the contact surface of the two steel plates. Under the load， there are 4 kinds of bearing capacity change trends of the connectors under the bridge， and the bearing capacity of some models decreases obviously before failure. When only a single element among the factors that affect the ultimate bearing capacity of the model changes， the ultimate bearing capacity doesn't completely change in a monotonous trend， there is a complex coupling relationship between every element.

Key words: cable-stayed system reinforcement, under-bridge connector, combined shear and compression load, double shear interface, hybrid connection

CLC Number: 

  • U441.4

Fig.1

Finite element model"

Fig.2

Schematic diagram of pressure plate"

Fig.3

Schematic diagram of connecting plate"

Table 1

Dimension table of pressure plate"

类 型α/（°）θ/（°）a/mm
35°承压板35125116
45°承压板4513592
60°承压板6015050

Fig.4

Bilinear cohesion model"

Table 2

Parameters of adhesive layer"

胶层种类δ1/mmδS/mmGτc/（N·m-1）
A0.25510
B0.501010
C0.751510

Fig.5

Type I failure mode"

Fig.6

Type II failure mode"

Fig.7

Type III failure mode"

Fig.8

Type IV failure mode"

Table 3

failure mode and ultimate bearing capacityof bolts"

模型螺栓破坏模式极限承载力/kN
35?A?0.3Ⅰ?a506.99
35?A?0.4Ⅰ?b502.55
35?A?0.5Ⅰ?c497.10
35?A?0.6Ⅰ?c497.56
35?B?0.3Ⅰ?a510.98
35?B?0.4Ⅰ?b563.18
35?B?0.5Ⅱ588.54
35?B?0.6Ⅱ590.64
35?C?0.3Ⅳ?b536.87
35?C?0.4Ⅳ?a587.51
35?C?0.5Ⅲ626.12
35?C?0.6Ⅲ690.59
45?A?0.3Ⅳ?c358.95
45?A?0.4Ⅰ?a413.76
45?A?0.5Ⅰ?b414.54
45?A?0.6Ⅰ?c398.58
45?B?0.3Ⅳ?b359.18
45?B?0.4Ⅰ?a418.78
45?B?0.5Ⅰ?b444.46
45?B?0.6Ⅱ471.90
45?C?0.3Ⅳ?b358.71
45?C?0.4Ⅳ?a448.74
45?C?0.5Ⅳ?a469.17
45?C?0.6Ⅲ502.21
60?A?0.3Ⅳ?b248.10
60?A?0.4Ⅳ?b287.80
60?A?0.5Ⅰ?a329.79
60?A?0.6Ⅰ?a346.03
60?B?0.3Ⅳ?c249.46
60?B?0.4Ⅳ?c295.41
60?B?0.5Ⅰ?a335.09
60?B?0.6Ⅰ?a351.85
60?C?0.3Ⅳ?c266.88
60?C?0.4Ⅳ?c320.51
60?C?0.5Ⅳ?b357.41
60?C?0.6Ⅳ?a369.54

Fig.9

The effect of adhesive layer on ultimate bearingcapacity of different friction coefficient models"

Fig.10

The effect of loading angle on ultimate bearing capacity of different adhesive layer models"

Fig.11

Effect of friction coefficient on ultimate bearing capacity of models with different loading angles"

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