Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1728-1738.doi: 10.13229/j.cnki.jdxbgxb20190674

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Static test and finite element analysis of scale model of fabricated box culvert

Ya-feng GONG1(),Jia-xiang SONG1,Hai-peng BI1,Guo-jin TAN1(),Guo-hai HU2,Si-yuan LIN1   

  1. 1.College of Transportation, Jilin University, Changchun 130022, China
    2.Jilin Traffic Planning and Design Institute, Changchun 130022, China
  • Received:2019-07-02 Online:2020-09-01 Published:2020-09-16
  • Contact: Guo-jin TAN E-mail:gongyf@jlu.edu.cn;tgj@jlu.edu.cn

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Abstract:

In order to provide basic data and technical support for the optimal design of prefabricated culvert, the mechanical properties of four types of culvert structures, namely, integral, flat-joint, circular hinge and tenon, are compared and analyzed by means of laboratory test and finite element analysis based on physical engineering. Firstly, the scale models of four kinds of culvert structures are constructed according to the similarity theory, and the static responses of these models in the full loading process are tested. Secondly, the mechanical properties of typical integral and circular hinged box cults are studied by finite element simulation. Finally, based on the test data and numerical simulation results, the mechanical properties of the four types of box culvert structures are analyzed and compared comprehensively, and some useful suggestions are given. The research results show that the failure modes of all four types of components are bending failure of the concrete at the bottom of the upper roof after cracking, but the setting of hinge joints significantly changes the stress state of the box culvert structure, especially the stress state of the side wall. The bearing capacity is similar to that of cracking load, that the integral box culvert structure has the maximal bearing capacity and circular hinged box culvert structure has the the minimal capacity.

Key words: bridge engineering, prefabricated culvert, scale model, static load test, finite element analysis

CLC Number: 

  • U449.1

Fig.1

Structural dimension drawing of prefabricated box culvert"

Table 1

List of scale models"

序号结构尺寸有、无铰缝构造图示结构型式
1

跨径：116cm

墙高：97.5 cm

涵长：25 cm

有平缝式
2有圆铰式
3无-整体式
4有榫接式

Fig.2

Structural design drawing of prefabricated box culvert"

Fig.3

Schematic diagram of test loading"

Fig.4

Arrangement of measuring points"

Fig.5

Failure pattern of integral component side wall"

Table 2

Test results"

结构类型开裂荷载极限荷载

荷载

/kN

上顶板

起裂位置

荷载

/kN

上顶板跨中 挠度/mm
平缝式17.30.32L26.412.41
圆铰式9.20.48L22.019.21
整体式20.00.38L32.07.21
榫接式14.00.36L23.09.04

Fig.6

Mid-span deflection-load curve of upper roof of four types of box culvert structures"

Fig.7

Displacement distribution rules of side walls of various models"

Fig.8

Strain distribution at mid-span section of upper roof of various box culvert structures"

Fig.9

Finite element model of integral box culvert structure"

Fig.10

Finite element model of circular hinged box culvert structure"

Fig.11

Mid-span deflection-load curve of top plate of circular hyinged box culvert"

Fig.12

Mid-span deflection-load curve of integral box culvert upper roof"

Fig.13

Axial force diagram of assembled box culvert steel bars in direction X"

Fig.14

Axial force diagram of assembled box culvert steel bars in direction Y"

Fig.15

Cloud diagram of first main stress of concrete"

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