A teaching experimental device and experimental method for verifying the role of zero bars in the process of truss instability
An experimental device and truss technology, applied in the field of functional teaching experimental devices, can solve problems such as incomplete mastery and incomplete theoretical understanding of students, and achieve the effect of simple experiments
Active Publication Date: 2022-04-15
DALIAN UNIV OF TECH
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Problems solved by technology
[0003] At present, the structural mechanics of domestic colleges and universities mainly adopts theoretical teaching, and some key theories have not been verified by experiments, which will inevitably lead to students' incomplete understanding of relevant theories, incomplete grasp, and even doubts
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[0032] In the present invention, two brittle bars are arranged at the positions of two compression members with different internal forces in the truss structure under the action of the load, respectively, when the two brittle members have no zero-bar connection and only one brittle member is connected with the zero-bar In this case, the load at the same position is applied, the deflection and internal force of the two structures are measured, the failure load and failure form of the two structures are compared, and the influence of the existence of the zero bar on the instability of the truss structure is verified.
[0033] The implementation process of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0034] A teaching experiment device for verifying the effect of a zero bar in the process of truss instability consists of a truss structure, a loading device, a supporting and restraining device, and a measurin...
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The invention provides a teaching experiment device and an experiment method for verifying the effect of a zero bar in the process of truss instability. The teaching experiment device includes a truss structure, a worm gear loading device, a support and restraint device and measuring equipment. The rectangular truss structure is composed of different rods connected to each other through hinge nodes, and its interior is connected to different rods through hinge nodes. The worm gear loading device is installed above the truss structure to realize the loading and unloading of the truss structure, and display the added load on the computer through the force sensor. The support and restraint device includes the restraint support of the reaction force frame and the truss structure; the restraint support of the truss structure includes a fixed hinge support and a movable hinge support. The invention can verify the effect of the zero bar in the instability process of the truss. The beneficial effect of the invention is that the structure form of the truss is changeable, the loading point and the position of the plastic member under pressure can be replaced, the experimental results are intuitive and easy to test, and it is suitable for colleges and universities to carry out relevant teaching experiments and design expansion.
Description
technical field [0001] The invention belongs to the field of structural mechanics experiment teaching for civil engineering specialty, and relates to a teaching experiment device for verifying the function of zero bar in the process of truss instability. Background technique [0002] With the continuous development of national economic level and scientific and technological level, truss structure buildings with simple construction and reasonable stress continue to emerge. In order to ensure the safety and stability of the structure, the design of the truss must adopt a statically indeterminate structure, of which the zero bar is an essential component. The zero bar refers to the member with zero force in the truss structure under the hypothetical state of the two-force bar. Therefore, the existence of the zero bar hardly contributes to the force transmission in the structure, but it can reduce the effective length of the connected members. Reducing the slenderness ratio of ...
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IPC IPC(8): G09B25/04
CPCG09B25/04
Inventor 陈廷国任珵娇徐凤娇吴鑫旖李克恒段迪
Owner DALIAN UNIV OF TECH