A Design Method for the Negative Moment Area of Steel-Concrete Composite Beams
A technology of negative bending moment area and design method, which is applied in the direction of bridge construction, bridges, bridge materials, etc., can solve the problems of cumbersome trial calculation and lack of versatility, and achieve the effect of clear concept, strong practicability and strong versatility
Active Publication Date: 2021-02-02
HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD +2
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The trial calculation is not only cumbersome, but also subjective and arbitrary, and it is not universal for different projects
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[0032] The design method of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to the following embodiments. The design method of the invention is applicable to multi-span steel-concrete composite continuous beams and steel-concrete composite continuous beams with different spans.
[0033] One, in conjunction with accompanying drawing, the principle of the design method of the present invention is deduced and illustrated.
[0034] For highway bridges, the dead load accounts for more than 70% of the total load, so the bending moment of the steel-concrete composite continuous beam is basically determined by the dead load evenly distributed along the bridge span.
[0035] For a 2×L two-span steel-concrete composite continuous girder bridge, there is a uniformly distributed constant load q acting on the bridge, such as Figure 2.1 , the mid-span general se...
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The invention discloses a design method for the negative bending moment zone of steel-concrete composite continuous beams. Firstly, the general section moment of inertia I and the fulcrum of the composite beam are calculated according to the cross-sectional size of the composite beam and the planned thickness of the floor concrete in the negative bending moment zone. Sectional moment of inertia I' in the negative moment area; establish a continuous beam calculation model with the section moment of inertia of the whole bridge being I, and calculate the maximum positive moment of mid-span under constant load M max and the maximum negative bending moment M of the fulcrum min ; Solve the equation F(λ)=0, and calculate λ; according to L'=λL, calculate the length L' of the concrete section of the floor in the negative moment zone of the composite beam, and complete the design of the negative moment zone. The length of the negative moment region of the steel-concrete composite continuous beam deduced based on the method of structural mechanics in the present invention is used as the length of the floor concrete section in the negative moment region, and can quickly complete the design of the negative moment region of the steel-concrete composite continuous beam. The disadvantages of subjective arbitrariness and repeated trial and error in design have a series of advantages such as clear mechanics concept and strong versatility.
Description
technical field [0001] The invention relates to bridge engineering technology, in particular to a design method for the negative moment zone of steel-concrete composite continuous beams. Background technique [0002] Steel-concrete composite structure is another important structural form of bridge after steel structure and concrete structure. It can combine the advantages of both, providing a new option for solving special bridges with super high, long span, heavy load and complex structures. [0003] The bridge deck in the fulcrum negative moment area of the steel-concrete composite continuous beam is inevitably under tension, which can easily cause concrete cracking, and then affect the working performance and service life of the steel-concrete composite continuous beam. In current engineering, double combination technology is widely used to improve the mechanical performance of steel-concrete composite continuous beams in the negative moment zone. Double composite eff...
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IPC IPC(8): E01D2/00E01D101/26
CPCE01D2/00E01D2101/26
Inventor 李斐然张存超张士红谢理伟郭晓光黄辉辛勇刘闯邢雪辉
Owner HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD