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Stagnation temperature computing method of bending steel members

A critical temperature, calculation method technology, applied in building construction, investigation phase/state change, construction, etc., can solve problems such as cumbersome process and large amount of calculation

Inactive Publication Date: 2013-07-17
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing invention patent "Design Selection Method for Fire Protection of Steel Frame Structures" (Patent No.: 200610161954.6) proposes the upper limit method of plastic limit analysis to determine the critical temperature of the overall structure. The critical temperature is based on different damaged structures. Iterative calculation, the process is cumbersome and the amount of calculation is large

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  • Stagnation temperature computing method of bending steel members
  • Stagnation temperature computing method of bending steel members
  • Stagnation temperature computing method of bending steel members

Examples

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Effect test

Embodiment 1

[0028] Embodiment 1 (theoretical description and deduction for supporting the establishment of the implementation steps of the technical solution method of the present invention)

[0029] Under fire, as the internal temperature of the steel structure rises, the bearing capacity of the steel structure will decrease. When the bearing capacity of the structure decreases to be equal to the combined effect produced by the external action (including the temperature action), the structure will reach the fire resistance bearing capacity. limit state. The limit state check calculation of the bearing capacity of steel members at high temperature can adopt a form similar to that at room temperature specified in the current steel structure design code. The bearing capacity of compression-bending members is generally controlled by the overall stability. The limit state in this case can be expressed by the following formula:

[0030] Bending around the strong x-axis: N ...

Embodiment 2

[0149] [0149] Embodiment 2 (concrete calculation example for supporting the feasibility and practicability of the technical solution of the present invention)

[0150] The calculation method of the critical temperature of the bending steel member is as follows: image 3 As shown, the specific steps are as follows:

[0151] (1) In the design of general steel structures, the geometric dimensions and load combinations of steel components are known. According to geometric dimensions such as cross-sectional area A, calculated length l, and radius of gyration r, the slenderness ratio of components can be calculated l=l / r. According to the length The fine ratio can be obtained from the "Code for Design of Steel Structures" GB50017: 2003, and the stability coefficient j of axial compression members around the strong axis and weak axis at room temperature can be found x , j y ;According to the geometric dimensions such as section moment of inertia I, section modulus W, slenderness ...

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Abstract

The invention relates to a practical fire resisting design method of a construction steel structure, and particularly relates to a stagnation temperature computing method of bending steel members. According to the method provided by the invention, stagnation temperatures of the bending steel members with different stability coefficients and load ratios can be directly obtained through checking a table. The method comprises the following specific steps of: respectively computing stagnation temperatures for bending a steel member around a strong shaft and a weak shaft under stable control and stagnation temperatures under section intensity control, wherein the minimum value of the stagnation temperatures under the three destruction is taken as a stagnation temperature of a bending framework. The method provided by the invention determines to reduce steel product strength at a high temperature according to a great quantity of test data, and the stability coefficients of bending steel members at a high temperature is directly obtained through checking the table. The method provided by the invention gives out the stagnation temperatures of the bending steel members through a form mode, a complicated numerical calculation process is avoided, and a steel structure fire resisting design method provided by the invention is convenient and reliable.

Description

technical field [0001] The invention relates to a practical fire-resistant design method for building steel structures, in particular to a calculation method for the critical temperature of a bent steel component. Background technique [0002] Steel structure has been widely used in high-rise buildings in my country because of its light weight, high strength, convenient construction and recyclable materials. However, steel is not fire-resistant. When the fire temperature reaches 600°C, the steel will lose most of its strength, resulting in The destruction of steel structures has caused great losses to human life and property. "Technical Code for Fire Protection of Building Steel Structures" CECS200:2006 stipulates the fire protection requirements of steel structures through the concept of "fire resistance limit", and stipulates that in general, only the fire resistance bearing capacity limit state of each component of the structure can be checked to meet Component fire resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/12E04B1/24
Inventor 李国强姜健楼国彪蒋首超
Owner TONGJI UNIV
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