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Design method for steel and concrete combined continuous beam hogging moment area

A technology of negative bending moment area and design method, applied in bridge construction, bridges, bridge materials, etc., can solve the problems of cumbersome trial calculation and lack of generality, and achieve the effect of clear concept, strong practicability and strong versatility

Active Publication Date: 2019-09-20
HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The trial calculation is not only cumbersome, but also subjective and arbitrary, and it is not universal for different projects

Method used

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  • Design method for steel and concrete combined continuous beam hogging moment area
  • Design method for steel and concrete combined continuous beam hogging moment area
  • Design method for steel and concrete combined continuous beam hogging moment area

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Embodiment Construction

[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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Abstract

The invention discloses a design method for a steel and concrete combined continuous beam hogging moment area. Firstly, according to the section size of a combined beam and the fitted hogging moment area bottom plate concrete thickness, the common section inertia moment I and the fulcrum hogging moment area section inertia moment I' of the combined beam are calculated; a continuous beam calculation model in which full-bridge section inertia moments are I is established, and the midspan maximum sagging moment Mmax and the fulcrum maximum hogging moment Mmin under the action of the constant load are calculated; the equation F(lambda)=0 is solved, and lambda is obtained through calculation; and according to L'=lambdaL, the hogging moment area bottom plate concrete section length L' of the combined beam is obtained through calculation, and hogging moment area design is finished. According to the design method, the steel and concrete combined continuous beam hogging moment area length obtained through derivation of the structural mechanics method serves as the hogging moment area bottom plate concrete section length, the hogging moment area design of the steel and concrete combined continuous beam can be rapidly finished, and the design method overcomes the defects that during engineering design, subjective randomness is large, and pilot calculation is repeated; and a series of advantages that the mechanics concept is clear, and universality is high are achieved.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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