Two-span continuous beam bending moment influence line test experimental device

A bending moment influence line and test experiment technology, applied in educational appliances, instruments, teaching models, etc., can solve the problems of complex internal force characteristics of statically indeterminate continuous beam structures, students understand and leave deep impressions, etc., to strengthen intuitive judgment , Improve hands-on ability, improve the effect of learning interest

Inactive Publication Date: 2015-07-01
HOHAI UNIV
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Problems solved by technology

At present, there is no experimental device for the influence line of statically indeterminate structure used in student experiments. Even if there is, it is different from the device of the present invention in principle, and it is only for statically determinate simply supported beam structures, not for statical

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  • Two-span continuous beam bending moment influence line test experimental device
  • Two-span continuous beam bending moment influence line test experimental device
  • Two-span continuous beam bending moment influence line test experimental device

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] figure 1 The continuous beam specimen shown is composed of steel with a length of 121.6cm×width 1.0cm×a height of 1.5cm, and its modulus of elasticity is 2.0×10 11 Pa; the two ends of the beam 1 are respectively constrained by a pair of double-roller bearings 2 fixed on the platform 4 to constrain its vertical degree of freedom, and the middle point is constrained by a single-roller bearing 3 to constrain its downward degree of freedom, and finally It constitutes a symmetrical two-span continuous beam structure; the mobile loading device is composed of a roller 6 hung with a weight 5, and the roller 6 can be pulled by a pull wire 7 to any x position on the left span of the main beam 1; the strain sensor 10 is symmetrically arranged on The lower edge of the measured section of the continuous beam can measure the strain under the moving load through th...

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Abstract

The invention relates to structural mechanics experimental devices, particularly to a bending moment influence line test experimental device of a continuous beam as the statically indeterminate structure. Vertical DOF (degree of freedom) of two ends of a beam is limited by a pair of double-roller supports which are fixed on a stand, and downward DOF of the middle of the beam is limited by a single-roller support, accordingly forming a symmetrical two-span continuous beam structure; moving load is applied on the beam by a roller with a weight hanging, the roller is pulled by a pull line to an optional position of the left span of the beam, strain sensors are symmetrically arranged on the optional positions of the bottom of the beam and connected with a data collecting device, and through a ruler, load acting position and a measuring point are given accurately. According to the arrangement, under moving load action of the continuous beam, bending moment influence lines generated on different positions are quantitatively obtained, and wide application to the structural mechanics experiments of high engineering colleges is achieved.

Description

technical field [0001] The invention mainly relates to a structural mechanics experiment device, in particular to a bending moment influence line test device for a statically indeterminate structure such as a continuous beam. Background technique [0002] The bending moment influence line refers to the graph of the bending moment of a certain section of the beam changing with the position of the moving load under the action of a certain amount of moving load; through the bending moment influence line, it can be determined that when the moving load moves on the beam, what happens at a certain section Maximum bending moment value and minimum bending moment value. In structural design engineering, the cross-sectional size and reinforcement of the beam can be determined through the beam's bending moment influence line, so the bending moment influence line is very important in the design of crane beams, floors and bridges under moving loads. At present, there is no experimental ...

Claims

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Application Information

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IPC IPC(8): G09B23/10
CPCG09B23/10
Inventor 孙立国杜成斌于国军王山山陈玉泉江守燕陈欣
Owner HOHAI UNIV
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