Method for computing stagnation temperature of flexural steel member

A technology of critical temperature and bending components, 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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Problems solved by technology

The existing invention patent "Design selection method for fire protection of steel frame structures" (Patent No.: 200610161954.6) proposes to determine the critical temperature of the overall structure according to the upper limit method of plastic limit analysis. This 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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  • Method for computing stagnation temperature of flexural steel member
  • Method for computing stagnation temperature of flexural steel member
  • Method for computing stagnation temperature of flexural steel member

Examples

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Embodiment 1

[0042] Embodiment 1 (theoretical basis)

[0043] 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 checking calculation of the limit state of the bearing capacity of steel members at high temperature can adopt the form similar to that at room temperature specified in the current steel structure design code. formula means:

[0044] M j bT W = f yT - - - ( 1 )

[0045] Where M is the bending moment on the member;

[0046] ——the overall sta...

Embodiment 2

[0097] Embodiment 2 (specific example)

[0098] The calculation method of the critical temperature of the bending steel member is as follows: figure 2 As shown, the specific steps are as follows:

[0099] (1) The geometric dimensions and bending moment M of steel members are known in the design of general steel structures. According to geometric dimensions such as section moment of inertia I, section modulus W, slenderness ratio l, etc., it is stipulated in "Code for Design of Steel Structures" GB50017:2003 The stability factor j of the flexural member at room temperature can be found.

[0100] (2) According to the bending moment M, section modulus W and steel strength design value f, the load ratio R=M / jWf of the member can be calculated.

[0101] (3) According to the load ratio R, the critical temperature T of the flexural steel member can be calculated by formulas (10) and (11) d ; For the convenience of application, according to the load ratio R and the stability facto...

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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 method for computing stagnation temperature of a flexural steel member. According to the method provided by the invention, aiming at different stability coefficients and load ratios, the stagnation temperature of the flexural steel member can be directly taken through checking a table; and the reduction in the steel product strength at a high temperature is determined according to a great quantity of test data, and the stability coefficient of the flexural steel member at the high temperature is directly taken through checking the table. According to the method provided by the invention, the stagnation temperature of the flexural steel member is given out through a form mode, and the complicated numerical calculation process is avoided; and the invention provides a convenient and reliable steel structure fire resisting design method.

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 bending steel component. Background technique [0002] Steel structures have been widely used in high-rise buildings in my country because of their 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. It will cause damage to the steel structure and cause great loss 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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