Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (5): 1390-1399.doi: 10.13229/j.cnki.jdxbgxb.20220603

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Experimental research on flexural performance of tubular roof prefabricated structural components

Yan-qing ZHANG1,2(),Yu-xuan LYU2,Shi HAN2,3(),Long-fei YOU2,Jun ZENG2,Fei-yang HOU2   

  1. 1.Key Laboratory of Roads and Railway Engineering Safety Control （Shijiazhuang Tiedao University），Ministry of Education，Shijiazhuang 050043，China
    2.School of Civil Engineering，Shijiazhuang Tiedao University，Shijiazhuang 050043，China
    3.School of Architecture and Water Conservancy Engineering，Bingtuan Xingxin Vocational and Technical College，Tiemenguan 841007，China
  • Received:2022-05-18 Online:2023-05-01 Published:2023-05-25
  • Contact: Shi HAN E-mail:zhangyanqingtaian@stdu.edu.cn;hanshi1998@163.com

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Abstract:

Taking the setting of connectors as parameters， an experimental study on the flexural performance of pipe curtain prefabricated structural members was conducted in this paper. The crack development and failure mode of specimens were observed， and the load， deflection and strain of the specimens were measured. Based on the test results， the stress mechanism of tubular roof prefabricated （TRP） structures was studied， and the influence of connectors on the flexural performance of TRP structural members was analyzed. The results show that the failure process and stress mechanism of flexural members in the TRP structures are quite different from that of the equal section double steel plate concrete flexural members. The failure of flexural members in the TRP structures generally occurs at the intersection of steel pipe curtains and steel plates， which is due to the tendency of the steel plate part to be pulled outward by arc steel pipe part in the steel pipe curtain. The failure starts from the yielding of transverse reinforcement， and ends at the yielding of steel pipe curtain after it is completely separated from the concrete. The setting of bi-steels can improve the mechanical properties of flexural members of TRP structures.

Key words: underground engineering, tubular roof prefabricated structure, flexural performance, connector, bearing capacity

CLC Number: 

  • TU375.1

Fig.1

Tubular roof prefabricated（TRP） structure"

Fig.2

Specimen design"

Fig.3

Test site"

Fig.4

Layout of measuring points"

Fig.5

Failure process of Specimen VSCF1"

Fig.6

Failure process of Specimen VSCF2"

Fig.7

Failure process of specimen VSCF3"

Fig.8

Load and mid-span deflection relationships"

Table 1

Loads and deflections of characteristic points"

编号Pcr/kN△cr/mmPy/kN△y/mmPf/kN
VSCF136.000.6769.405.05110.10
VSCF237.000.3574.903.75109.10
VSCF334.000.41108.705.57162.00

Fig.9

Load-strain curvesof steel plate supports"

Fig.10

Load-strain curves of connectors"

Fig.11

Load-strain curves of steel plates at mid-span sections"

Fig.12

Strain changes of steel plates along the longitudinal axis of symmetry"

Fig.13

Deformation of steel plate at mid-span section"

Fig.14

Load-strain relationship on cracked sections of specimen VSCF2"

Fig.15

Concrete strain on sections of specimen VSCF3"

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