Novel mixed-strength shear-resistant connection joint based on pressure-bearing type high-strength bolts

A high-strength bolt, mixed-strength technology, used in construction, building construction, etc., can solve problems such as low efficiency of steel utilization, weakened section, and limited number of bolts

Active Publication Date: 2021-09-14
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing pressure-bearing bolted shear connection nodes mostly adopt regular or staggered arrangements. Considering the need to avoid excessive weakening of the cross-section caused by the arrangement of too many bolts in a single cross-section of the steel plate with low cross-sectional tensile strength, the single cross-

Method used

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  • Novel mixed-strength shear-resistant connection joint based on pressure-bearing type high-strength bolts
  • Novel mixed-strength shear-resistant connection joint based on pressure-bearing type high-strength bolts
  • Novel mixed-strength shear-resistant connection joint based on pressure-bearing type high-strength bolts

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Experimental program
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Effect test

Embodiment 1

[0024] A new mixed-strength shear connection joint based on pressure-bearing high-strength bolts is used for steel plates with different cross-sectional tensile strengths connected by lap joints. The steel plates with different cross-sectional tensile strengths include the first steel plate with high cross-sectional tensile strength A steel plate 1 and a second steel plate 2 with low cross-sectional tensile strength, the first steel plate 1 and the second steel plate 2 are fixedly connected by n bolts 3, and starting from the end of the second steel plate 1 close to the connection end, n The number of bolts 3 is divided into m rows and arranged, wherein the number of bolts 3 in the first row is n1, the number of bolts 3 in the second row is n2, and so on until the number of bolts 3 in the mth row is nm; The number of bolts 3 in the first row, the second row... to the m-th row monotonically decreases in turn, that is, n1>=n2...>=nm>0.

[0025] In this embodiment, when the numbe...

Embodiment 2

[0030] This implementation provides a new mixed-strength shear joint based on pressure-bearing high-strength bolts according to the requirements in Example 1, which includes two steel plates with different tensile properties, namely the first steel plate 1 and the second steel plate 2 and high-strength bolts3.

[0031] For the node instance of this embodiment, see image 3 , the design shear capacity of the gusset plate is 402.6kN.

[0032] see image 3 , this node includes the second steel plate 2 with low section tensile strength, the first steel plate 1 with high section tensile strength, and the arrangement example of bolt 3 .

[0033] Among them, the second steel plate 2 with low cross-sectional tensile strength in this node is a Q235 steel plate with a width of 216 mm and a thickness of 10 mm; the first steel plate 1 with a high cross-sectional tensile strength is a Q345 steel plate with a width of 216 mm and a thickness of 10 mm;

[0034] In this embodiment, an examp...

Embodiment 3

[0041] The main structure of this embodiment is the same as that of Embodiment 2. see Figure 5 , Figure 6 , the difference is that the first steel plate 1 with high section tensile strength in the node is a Q235 steel plate with a width of 216 mm and a thickness of 20 mm.

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Abstract

The invention discloses a novel mixed-strength shear-resistant connecting joint based on pressure-bearing type high-strength bolts, and belongs to the technical field of bridge engineering. The novel mixed-strength shear-resistant connecting joint comprises a first steel plate with high section tensile strength and a second steel plate with low section tensile strength, wherein the first steel plate and the second steel plate are fixedly connected through n bolts, the n bolts are sequentially divided into m rows to be arranged from the end, close to the connecting end, of the second steel plate, the number of the bolts arranged in the first row is n1, the number of the bolts arranged in the second row is n2, the number of the bolts arranged in the mth row is nm in proper order, and the number of the bolts arranged in the first row, the second row, ..., to the mth row is monotonically decreased in sequence. According to the novel mixed-strength shear-resistant connecting joint, while the reliability of the to-be-connected steel plate with low section tensile strength is protected, the material utilization rate of the to-be-connected steel plate with high section tensile strength is high; and under the same joint shearing resistance requirement, the utilization rate of the to-be-connected steel plate with high section tensile strength in the novel joint can be increased by 33%.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a novel mixed-strength shear-resistant connection node based on pressure-bearing high-strength bolts. Background technique [0002] The pressure-bearing high-strength bolt connection is one of the commonly used steel shear connection forms at present. The ideal shear connection bearing capacity should mainly come from the pressure of the steel plate hole wall and the shear of the bolt and screw, and try to avoid the form of net section damage, so as to ensure High material utilization and reliable ductility. [0003] In engineering, the problem of overlapping steel materials with different tensile properties of sections often occurs due to different section thicknesses, widths or steel types. Existing pressure-bearing bolted shear connection nodes mostly adopt regular or staggered arrangements. Considering the need to avoid excessive weakening of the cross...

Claims

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Application Information

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IPC IPC(8): E04B1/08E04B1/61
CPCE04B1/08E04B1/61
Inventor 狄谨肖博文张茜秦凤江
Owner CHONGQING UNIV
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