Adaptive control method of temperature internal force for statically indeterminate bridge structures
An adaptive control, bridge structure technology, applied in the direction of bridges, bridge parts, bridge forms, etc., can solve problems such as deviation, achieve the effects of simple structure, elimination of additional internal forces, and convenient installation
Active Publication Date: 2016-06-08
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 anchorage point, the elastic modulus E=2.0E11pa, and the coefficient of linear expansion is taken as . Assuming that the cables are installed at 10°C above the closing temperature of the bridge, the temperature of the cables will drop when the temperature is 10°C lower than the closing temperature Considered at 20°C.
[0042] The cable force in the cable is:
[0043]
[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 moment arm of the cable to the arch foot l is 3 meters, then the positive bending moment generated by the cable on the arch foot is:
[0045]
[0046] ...
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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 present invention involves the bridge field, specifically a temperature internal force self -adaptive control method for the temperature and internal force of the ultra -static bridge structure. Background technique [0002] The bridge structure is inevitable to be affected by external conditions, such as environmental temperature, humidity, wind, and earthquakes. The impact of changes in environmental temperature on the bridge is more common.It will affect the normal use and safe operation of the bridge structure.Taking the hinge arch bridge as an example, the hinge arch bridge is a super -quiet bridge structure. Due to the thermal expansion and contraction of the arched ring material, temperature deformation is bound to cause.Temperature additional internal force.Generally, cooling can cause a negative bending moment when the arch foot of the hinge -free arch bridge is produced, and a positive bending moment is generated on the vault, causing the back...
Claims
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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