A self-adaptive control method for temperature and internal force of statically indeterminate bridge structures
An adaptive control and bridge structure technology, applied to bridges, bridge parts, bridge forms, etc., can solve problems such as deviation, achieve simple structure, eliminate additional internal force, and have obvious effects
Active Publication Date: 2017-07-25
肖军 +2
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Problems solved by technology
However, due to the fact that the investigation of the annual average temperature at the bridge site cannot be comprehensive, sometimes there are even large deviations; in addition, there are usually differences between the designed closing temperature and the actual closing temperature, which lead to Accurately accounting for the effect of ambient temperature will not be possible
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[0041] Taking the hingeless arch bridge as an example, it is assumed that the diameter of the cable is d=0.1m, the length is determined according to the position of the anchor point, the elastic modulus E=2.0E11pa, and the linear expansion coefficient is taken as ζ=1.2×10 -5 . Assuming that the cables are installed at 10°C above the closing temperature of the bridge, when the temperature is 10°C lower than the closing temperature, the temperature drop △T of the cables is considered as 20°C.
[0042] The cable force in the cable is:
[0043] F=EAξ=Eαζ△t
[0044] It is calculated that the cable force in the cable is 376.8kN when the ambient temperature drops by 10°C. Usually, the cables are arranged on the upper and lower sides of the arch bridge, that is, the cable force contribution of the cables to the arch foot is 2F=753.6kN. If the force arm l of the cable to the arch foot is 3 meters, the positive bending moment produced by the cable to the arch foot is:
[0045] m ls...
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The invention discloses an adaptive control method of temperature internal force for statically indeterminate bridge structures. The method is suitable for all statically indeterminate bridge structures including a hingless arch bridge, a continuous girder bridge, a continuous rigid frame bridge and the like. In order to describe and explain innovative points of the content of the adaptive control method disclosed by the invention more audio-visually, the hingless arch bridge is used as an embodiment to be specifically described and comprises an anchoring member, a high strength bolt, a universal head connecting device and a stay cable, wherein the anchoring member is made from cast steel structural members, the right end of the anchoring member is anchored in reinforced concrete of a main arch in a pre-buried manner or a steel bar embedded manner, a bearing pull rod is arranged at the left end of the anchoring member, and a high strength bolt hole is formed in the bearing pull rod; the right end of the universal head connecting device is connected with the bearing pull rod through a flange plate and the high strength bolt, a plurality of reinforcing ribs are arranged between the flange plate and the universal head connecting device, and the stay cable is mounted at the left end of the universal head connecting device through a universal ball head nut.
Description
technical field [0001] The invention relates to the field of bridges, in particular to a method for self-adaptive control of temperature and internal force for statically indeterminate bridge structures. Background technique [0002] Bridge structures in the natural environment are inevitably affected by external conditions, such as ambient temperature, humidity, strong winds, earthquakes, etc. Among them, the impact of changes in ambient temperature on bridges is more common, and the internal forces and deformations caused by temperature effects are inevitable. It will affect the normal use and safe operation of the bridge structure. Take the hingeless arch bridge as an example. The hingeless arch bridge is a statically indeterminate bridge structure. Due to the thermal expansion and contraction of the arch ring material, temperature deformation is bound to occur. When the deformation is restrained, considerable vibration will occur inside the arch ring. Temperature adds i...
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IPC IPC(8): E01D4/00E01D19/14E01D19/16
Inventor 肖军李铮刘晨光张德义陈昆萍周霜林张明金王建培肖林贾宏宇
Owner 肖军