Design method for test model of combination section of wide-width combined-hybrid beam cable-stayed bridge

Abstract

The invention belongs to the technical field of civil engineering, and relates to a wide combination-hybrid beam cable-stayed bridge joint section test model design method, which comprises the following steps of: determining a maximum stress area on a total cross section in a joint section range as a local cross section model according to a finite element calculation result; according to a finite element calculation result, obtaining a local section model loading internal force by using a local section model internal unit node force integration method; selecting the geometric similarity ratio of the model under the principle of considering the test loading capacity and reducing the model processing difficulty; determining the design and arrangement of a shear connector according to the principle that the slippage of the interface of the steel structure and the concrete structure obeys the similarity principle; according to the method, the test model is designed in the mode that the local section of the original structure is transversely cut out, the width of the test structure is effectively reduced, the rigidity ratio of different parts on the section is not changed, and therefore the load proportion borne by all the parts on the section is not changed, and it is guaranteed that the stress characteristic of the local section model structure is consistent with that of the original structure.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a design method for a test model of a joint section of a wide-width composite-hybrid beam cable-stayed bridge. Background technique [0002] At present, the axial force transmitted by the joint section of the long-span hybrid beam cable-stayed bridge is usually between 10,000 tons and 20,000 tons, and the thickness of the thin steel roof in the structure is usually 12mm-16mm. Not less than 5mm-6mm, so if the full-section large-scale or equal-scale model is used, the geometric similarity ratio should be 1:3 or 1:2; even if the smaller 1:3 is used, under the condition of stress equivalent The axial force that needs to be applied at least 1100 tons, which has high requirements on the test loading capacity; and this full-section model occupies a large site, for the joint section with a bridge width of 40m, the geometric similarity ratio of 1:3 is adopted. Under...

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Problems solved by technology

[0004] In order to solve the technical problems in the above-mentioned prior art, the present invention provides a method for designing the test model of the joint section of a wide composite-mixed girder cable-stayed bridge, which is intended to solve the problem of using The problems caused by the existing technology are that the model occupies a large area, the cost is high, and there may be wrong conclusions

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