Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (9): 2533-2541.doi: 10.13229/j.cnki.jdxbgxb.20211225

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Interface slip calculation of prefabricated steel⁃concrete composite beams with clustering studs

Liang FAN1,2(),Ying-ming XU1,Yang TAN1   

  1. 1.School of Civil Engineering，Chongqing Jiaotong University，Chongqing 400074，China
    2.State Key Laboratory of Mountain Bridge and Tunnel Engineering，Chongqing Jiaotong University，Chongqing 400074，China
  • Received:2021-11-16 Online:2023-09-01 Published:2023-10-09

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Abstract:

For fabricated steel-concrete composite beams composed of concrete slabs with reserved post-pouring holes and steel beam with arranged discrete shear connectors， the interface slip distribution theory of fabricated steel-concrete composite beam with discrete interface shear connection is studied. Based on the beam deformation theory， fabricated composite beams with discrete shear connection are divided into shear connection area and non-shear connection area and the interface slip differential equations are established respectively based the displacement continuity and deformation coordination conditions. The interface slip distribution expression of intermittent shear connection composite beam are formulated， and the analytical expression of interface slip distribution under concentrated load and uniform load are solved. Through comparing with the existing slip distribution equation of continuous shear connection composite beam and the measured data of fabricated composite beam test， the slip distribution algorithm is verified. The influence of various parameters on slip and deformation of fabricated composite beams is analized with the parameters as the height ratio of concrete slab to steel beam， the shear connection degree and the clustering degree （an index reflecting the degree of bond clustering， defined as the ratio of the number of shear connectors in a （row） reserved hole to the number of shear connectors in the beam）. The results show that the interface slip decreases with the increase of the shear connection degree， and increases with the increase of the height ratio and the clustering degree； the larger the clustering degree， the more uneven slip distribution， and peak value appears in the non-shear connection area.

Key words: structure engineering, steel-concrete composite beam, interface slip, analytical algorithm, fabricate, clustering studs

CLC Number: 

  • TU398

Fig.1

Schematic diagram of interface shear force distribution of cast-in-place and fabricated composite beams"

Fig.2

Load state of micro element"

Fig.3

Strain distribution"

Fig.4

Isolated body"

Fig.5

Test beam structure drawing and measuring point layout"

Fig.6

Specimen of test beam"

Fig.7

Slip comparison of calculated and measured"

Fig.8

Calculated and measured strain of the bottom of the concrete slab and the top of the steel beam"

Table 1

Height ratio"

序号混凝土板厚度/mm钢梁高度/mm高度比
15022380.022
215022380.067
325022380.112
435022380.156
540022380.179
650022380.223

Table 2

Clustering degree"

序号预留孔数量单孔剪力键数量剪力键总数集束度
120244800.050
212404800.083
38604800.125
45964800.200
531604800.333

Fig.9

Interface slip distribution curve"

Fig.10

Influence of different parameters on the mid-span deflection"

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