Evaluation method of longitudinal horizontal line stiffness of upper pier and pier top of top-supported railway steel truss arch bridge arch
A technology for steel truss arch bridges and horizontal lines, applied in geometric CAD, design optimization/simulation, special data processing applications, etc., to achieve the effects of reasonable analysis, real and reliable stiffness, and simplified calculation process
Active Publication Date: 2022-06-21
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art of the lack of a reasonable evaluation method for the longitudinal horizontal line stiffness of the pier abutment top of the large-span upward-supporting railway steel truss arch bridge, and to provide an arch-upper pier of the upward-supporting railway steel truss arch bridge Judgment method for the stiffness of the vertical horizontal line of the roof
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[0024] For example, take the top-supported railway steel truss arch bridge with a main span of 490m as an example. figure 1 As shown, the steel truss arch ring 3 has a sag height of 109.5m and a sag-span ratio of 1 / 4.475. Its section adopts four trusses, and a total of 13 arch piers 1 are symmetrically arranged. The arch pier 1 is made of portal steel piers. Beam 2 adopts steel box girder, junction pier 4 adopts portal rigid frame pier structure, and the span of beam 2 on the arch is 14×37.2m.
[0025] According to the design requirements of the current "Code for Design of Railway Bridges and Culverts", the rigidity limits of the longitudinal horizontal line of the pier tops of conventional bridges (simply supported beams, continuous beams, continuous steel structures and tied arch bridges, etc.) The limit of the minimum horizontal line stiffness of the double-line bridge piers within the length range shall be taken as twice the minimum horizontal line stiffness limit of the s...
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The invention discloses a method for judging the stiffness of the longitudinal horizontal line of the pier top of an arched railway steel truss arch bridge. When analyzing the stiffness of the vertical horizontal line of the pier top, the steel truss arch circle is also considered in addition to the influence of the arch pier itself. and the influence of the arched girder on the arched pier, the steel truss arch bridge is established with a full bridge finite element model, and the longitudinal stiffness and structural size of the steel truss arch ring, the arched pier and the arched girder are comprehensively considered on the arched pier. The influence of the vertical horizontal line stiffness on the top of the pier, compared with the existing technology that only simulates the stiffness for a single pier, must also be determined in conjunction with the beam-rail analysis. This method is reasonable in analysis and can simplify the calculation process without analyzing the braking force The stress of the seamless rail under the action of equal longitudinal forces can fully reflect the longitudinal stiffness of the structure as a whole. The stiffness is true and reliable, and there is no need to blindly increase the size of the structure, which is beneficial to avoiding additional costs.
Description
technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a method for judging the longitudinal horizontal line stiffness of an upper pier and pier top of an arch of an upper-supported railway steel truss arch bridge. Background technique [0002] my country's railways use cross-section seamless lines. In order to ensure the stability and safety of the seamless lines on the bridge, the additional stress of the rails due to temperature changes, train braking (starting), etc. must be calculated. At the same time, in order to ensure the bridge structure To ensure the safety of the force, the additional longitudinal braking force on the top of the corresponding pier should also be checked and calculated. A large number of experimental research results have shown that: under the action of train braking, the additional longitudinal braking force and distribution on the top of bridge piers and abutments are not only affected by param...
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IPC IPC(8): G06F30/13G06F30/23
CPCG06F30/13G06F30/23
Inventor 陈克坚余浪易大伟艾智能徐建华许志艳何庭国黄毅游励晖许敏陈运泽
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD