Large-span variable-section beam

Abstract

The invention relates to the field of building construction, in particular to a large-span variable-section beam. The beam comprises columns, cantilever sections, simply supported sections and short beam sections; the cantilever sections are located on the two sides and fixedly connected with the columns; the simply supported sections are located in the middle, and at least one ends of the simplysupported sections are connected with the cantilever sections through the short beam sections; the short beam sections comprises cantilever side short beam sections and simply supported side short beam sections, wherein the cantilever side short beam sections are hinged to the simply supported side short beam sections, the ends of the cantilever side short beam sections are fixedly connected withthe cantilever sections, and the ends of the simply supported side short beam sections are fixedly connected with the simply supported sections; and the section height of the short beam sections is smaller than the section height of the cantilever sections and the section height of the simply supported sections. According to the large-span variable-section beam, the local section height can be effectively reduced, so that the local use space height of a building is increased, the space use requirement of the building is met, the building floor height does not need to be increased due to devicepipelines and the like, and the construction cost is saved.

Description

technical field [0001] The invention relates to the field of building structures, in particular to a large-span variable-section beam. Background technique [0002] With the rapid development of the economy and the improvement of people's living standards, people's demand for construction products is also increasing. High-rise and super high-rise buildings such as shopping malls, hotels, office buildings, airports, railway stations, and large urban complexes many. In order to meet the requirements of building quality, local long-span structures are unavoidable. Local long-span structures mean that local structures require a larger cross-sectional height of beams. For the sake of building economy, building height control is relatively strict, and long-span spaces need to be considered comprehensively The space reserved for equipment and pipelines, architectural decoration practices, and the setting of fire shutters are generally insufficient for the cross-sectional height of...

AI Technical Summary

Problems solved by technology

However, the segmental variable cross-section beam plus slab concrete structure system has the following disadvantages: (1) due to the use of concrete structure system, the structure has a large proportion of self-weight, which is only suitable for ordinary span structures and not suitable for long-span structures; (2) the middle The beam section is rigidly connected to the beam sections on both sides, and the variable section bears not only the shear force but also a large bending moment, the structure is a statically indeterminate structure, the structural analysis is complicated, and the section height of the beam is limited. The situation is difficult to meet the design requirements. Limited by the height of the building, the equipment and pipelines often pass through the structural beams. If the opening of the beams is used, the local stress concentration at the opening will be complicated, and the complex force needs to be calculated and analyzed using the complex structural finite element method. The construction is difficult; (3) Under strong earthquake action, a plastic hinge is formed in the beam section with a small section height, and the shear bearing capacity of the concrete beam section here is insufficient, which may easily cause the overall collapse of the structure

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