Evaluation method of stress redistribution under fire condition of cable body components and its application
A technology of redistribution and fire state, applied in the field of bridge cables, can solve the problems of inaccurate stress assessment, inability to reasonably assess the breaking situation and safety of steel wires, etc., and achieve the effect of accurate breaking situation and safety of steel wires.
Active Publication Date: 2022-07-05
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology
Neglecting the stress redistribution effect between the steel wires of each layer of the cable body will inevitably lead to inaccurate stress evaluation of the steel wires of each layer, and then the failure and safety of the steel wires of the cable body cannot be reasonably evaluated under fire
Method used
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[0021] The present invention will be further described below with reference to the accompanying drawings.
[0022] like figure 1 , figure 2 As shown, there are two modes of stress on the cable body member under fire condition. one such as figure 1 The main feature of the stress mode of the main cables of the suspension bridge shown is that the tension force of the cable body components remains basically unchanged during the whole process of fire, and the cable length increases with the increase of fire time. Another is as figure 2 The main feature of the force model of the suspension bridge suspension cable and the cable-stayed cable-stayed cable of the cable-stayed bridge shown is that the cable length of the cable body components remains basically unchanged during the whole process of fire, and the cable force changes with the fire time. The calculation formulas for the stress redistribution under the fire state are respectively established for the cable body members o...
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The invention discloses a stress redistribution evaluation method and its application under the state of fire of a cable body member. There are two stress modes for the cable body members under the fire state. One is the stress mode of the main cable of the suspension bridge. increased with the increase of the exposure time. The other is the stress mode of suspension bridge suspension and cable-stayed bridge cable-stayed cables. The stress redistribution evaluation method and its application under the fire state are established for the cable body members with two stress modes respectively. The beneficial effect of the invention is that the stress redistribution of each layer of steel wire in the cable body under fire condition is evaluated, so that it is more accurate to judge the wire breakage and safety of the cable body member under fire condition.
Description
technical field [0001] The invention relates to the technical field of bridge cables, in particular to a stress redistribution evaluation method and application of a cable body component under a fire state. Background technique [0002] The main cable is the main load-bearing component of the suspension bridge, and the suspension cable and the cable-stayed cable are the important force-transmitting components of the suspension bridge and the cable-stayed bridge respectively. The high-strength steel wire, which is a component material of the cable body, has strong tensile properties and is also a good conductor of heat. Under fire, the cable body heats up rapidly, the strength degrades rapidly, and the cable body components have a high risk of cable breakage, which greatly threatens the safety of the cable-bearing bridge structure. [0003] The breakage of the high-strength steel wire of the cable body member under fire is an important indicator for evaluating its safety. W...
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IPC IPC(8): G06F30/17G06F30/23G06F113/16G06F119/14
CPCG06F30/17G06F30/23G06F2113/16G06F2119/14
Inventor 沈锐利陈巍程翔巩明薛松领苗如松
Owner SOUTHWEST JIAOTONG UNIV