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Steel frame structure fire-resistant protection design and selection method

A design selection, steel frame technology, applied in the direction of building components, building structures, building insulation materials, etc., can solve problems such as difficult convergence and application, complex and cumbersome calculation of the lower limit method, and achieve the effect of simple structural calculation

Inactive Publication Date: 2007-07-11
CHINA HUANQIU CONTRACTING & ENG CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to scientifically determine the protection method of the steel frame, the fire resistance and protection method of the patented steel frame structure of the present invention considers the protection method of various basic steel frame structures with the strength of steel exceeding 200 °C, and proposes the upper limit of the plastic limit analysis method to determine the critical temperature of the overall structure, which overcomes the shortcomings of the previous lower limit method, which are complicated and cumbersome to calculate, difficult to converge and apply.

Method used

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  • Steel frame structure fire-resistant protection design and selection method
  • Steel frame structure fire-resistant protection design and selection method
  • Steel frame structure fire-resistant protection design and selection method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0084] ●Example 1: The span of a petrochemical single-span three-story steel frame is 12m, the heights of the first, second, and third floors are 5m, 3m, and 3m respectively, and the horizontal loads are all 100kN, and the vertical loads are all 200kN. The beam section is HN700×300, and the column section is HM588×300. During a fire, the heat release Q of the fire source on the steel frame on the ground is 36MW. As shown in Figure 6, determine the protection method of the steel frame.

[0085] The calculation steps are as follows:

[0086] 1. Determine the basic parameters of the calculation program:

[0087] (1) Steel frame type ip1=4, temperature change ip2=1, ip3=ip4=ip5=ip6=0;

[0088] (2) Section type: 2; (1 indicates rectangular section, 2 indicates I-shaped section)

[0089] (3) Section parameters:

[0090] I-shaped: cbb=0.3m; chb=0.7m; tb1=0.024m; tb2=0.0013m; cbc=0.3m; chc=0.588m; tc1=0.002m; tc2=0.012m;

[0091] (4) Length of beam and column: 1=12m; H1=3m; H2=3...

example 2

[0135] ●Example 2: The span of a petrochemical single-span three-story steel frame is 12m, the heights of the first, second, and third floors are 5m, 3m, and 3m respectively, and the horizontal loads are all 300kN, and the vertical loads are all 100kN. The beam section is HN700×300, and the column section is HM588×300. During a fire, the heat release Q of the fire source on the steel frame on the ground is 36MW. As shown in Figure 6, determine the protection method of the steel frame.

[0136] Calculation steps 1-7 are the same as Example 1.

[0137] 8. Preliminary conclusion 1:

[0138]Tc(one layer)=397.0286℃

[0139] Tc (two layers) = 347.0287°C < Tm (two layers) = 602°C

[0140] Tc (three layers) = 297.0286°C < Tm (three layers) = 443°C

[0141] Through the comparison of the critical temperature calculated by the program and the maximum temperature of the components, the first, second and third floors of the steel frame structure are all in an unsafe...

example 3

[0162] ●Example 3: The span of a petrochemical single-span three-story steel frame is 12m, and the storey heights of the first, second, and third floors are

[0163] They are 5m, 3m, and 3m respectively. The horizontal load they bear is 200kN, and the vertical load they bear is 100kN. The beam sections are all HN346×174, and the column sections are all HM588×300. During a fire, the heat release Q of the fire source on the steel frame on the ground is 36MW. As shown in Figure 6, determine the protection method of the steel frame.

[0164] Calculation steps 1-7 are the same as Example 1.

[0165] 8. Preliminary conclusion 1:

[0166] Tc(one layer)=204.8698℃

[0167] Tc (two layers) = 154.8698°C < Tm (two layers) = 602°C

[0168] Tc (three layers) = 104.8698°C < Tm (three layers) = 443°C

[0169] Through the comparison of the critical temperature calculated by the program and the maximum temperature of the components, the first, second and third floors of ...

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Abstract

The invention provides a design selecting method for fire protection with steel frame structure, comprising following procedures that (1) according to plastic limit analysis theory, the total number N of basic failure mechanism of planar structure or spatial structure of steel frame structure is determined; (2) the object function eta, which is the ratio of internal work and external work added on basic failure mechanism in plastic limit state, is determined; (3) the minimum of eta is obtained by optimal analysis treatment and relative failure mechanism is found, according to the principle of plastic limit analysis theory relative critical temperature is the minimum value of all possible failure mechanisms in steel frame; (4) according to the variance of temperature, critical temperature of steel frame relative to the minimum value of object function eta is determined by iterative method and critical temperatures of every bars in steel frame are calculated whether the iterative result is coincidence with regular iterative convergence criterion or not; (5) critical temperatures of every bars in steel frame compare with temperature eigenvalue, which is achieved when fire happens, so as to determine if the steel frame is protected. The method makes structure calculation simple, effective and it is applied in engineering design.

Description

technical field [0001] The invention relates to the protection engineering design of disaster prevention and mitigation in the field of building structures, in particular to a design selection method for fire protection of steel frame structures. Background technique [0002] Steel frame structures are often used in building structures. If the temperature that the steel frame structure may reach in case of fire is less than 200°C, it is not necessary to provide fire protection for the steel frame structure, but when the temperature that the steel frame structure may reach exceeds 200°C, fire protection is required. For protection, because the temperature of the steel is 200℃≤T≤600℃, although it still maintains a certain strength, but the strength has been reduced. At 600℃, the strength of the steel is 30% of the normal temperature. Strength is 0. For this reason, under normal circumstances, part or all of the steel frame structure is protected by fire-resistant coating or o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04B1/00E04B1/19E04B1/24E04B1/62
Inventor 张荣钢张宏涛王晓纯张素枝郑建华徐秉业高建岭白玉星徐彤李园刘刚锋颜聪枝
Owner CHINA HUANQIU CONTRACTING & ENG CO LTD
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