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

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 ...

AI Technical Summary

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 statically indeterminate continuous beam structures. , and the internal force characteristics of the statically indeterminate continuous beam structure under the action of moving loads are more complicated. It is difficult for students to understand and impress this part of the content only by using pure theory teaching.

Images