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Fire resistance design method of glulam columns considering the degradation of wood strength in medium and low temperature regions

A technology of glulam columns and design methods, applied in calculation, instrumentation, geometric CAD, etc., can solve problems such as complex analysis process

Active Publication Date: 2019-11-22
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent with publication number 103324797A needs to analyze the structural system from the temperature field to the mechanical field, and the analysis process is very complicated

Method used

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  • Fire resistance design method of glulam columns considering the degradation of wood strength in medium and low temperature regions
  • Fire resistance design method of glulam columns considering the degradation of wood strength in medium and low temperature regions
  • Fire resistance design method of glulam columns considering the degradation of wood strength in medium and low temperature regions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Douglas pine glued wood column, the compressive strength of Douglas pine wood along the grain at room temperature is 33.7MPa, and the density is 450kg / m 3 , the moisture content w is 15%, the size of the glulam column is length × width × height: 200mm × 200mm × 4000mm, the design load level is 20%, and it is subjected to fire on all sides.

[0042] according to figure 1 and figure 2 To operate, the steps of its fire resistance design are as follows:

[0043] Step 1: According to the actual moisture content w of the glulam column is 15%, the density is 450kg / m 3 According to EN 1995-1-2, the material properties related to the establishment of wood thermal conductivity and specific heat thermal performance and density to dry density ratio are obtained, see Table 1 and Table 2. According to the actual fire situation of the four sides of the glued wood column, the radiation coefficient is set to 0.8 and the Stefan-Boltzmann constant is taken as 3.402×10 -6 . The heat...

Embodiment 2

[0061] Larch glued wood columns, the compressive strength along the grain of larch is 61.3MPa, and the density is 591kg / m 3 , the moisture content w is 11.0%, the size of the glulam column is length × width × height: 200mm × 200mm × 4000mm, the design load level is 65%, and it is subjected to fire on all sides.

[0062] The analyst's operation steps are the same as in Example 1:

[0063] Step 1: According to the actual moisture content w of the glulam column is 11.0%, the density is 591kg / m 3 . According to EN 1995-1-2, the material properties related to the establishment of wood thermal conductivity, specific heat thermal performance and density to dry density ratio are obtained, see Table 1 and Table 2. According to the actual fire situation of the four sides of the glued wood column, the radiation coefficient is set to 0.8 and the Stefan-Boltzmann constant is taken as 3.402×10 -6 . The heat exchange of the surface of the glulam column exposed to fire is set to a heat di...

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Abstract

The invention discloses a glued wooden pole fire-resistant design method in consideration of wood strength deterioration in a medium-low temperature area, and belongs to the field of fire-resistant design. The method comprises the following steps: analyzing finite element heat transfer on a cross section of the glued wooden pole to acquire the temperature field distribution on the cross section of the glued wooden pole under a standard fire hazard warming condition ruled by the international standard ISO834; establishing a wood high-temperature rift grain relative compressive strength multi-step simplified model according to the lignin thermal property of the wood, and determining an equivalent section of the cross section of the glued wooden pole; determining the bearing force of the glued wooden pole, and analyzing and designing the fire resistance of the glued wooden pole. By establishing the wood high-temperature rift grain relative compressive strength multi-step simplified model, acquiring the temperature field distribution on the cross section of the glued wooden pole, and determining the equivalent section of the cross section of the glued wooden pole in the firing process, the glued wooden pole fire-resistant design method in consideration of wood strength deterioration in the medium-low temperature area is proposed; and meanwhile, the fire endurance of the glued wooden pole is predicted.

Description

technical field [0001] The invention relates to a fire-resistant design of a glued wood column, in particular to a fire-resistant design method of a glued wood column considering the degradation of wood strength in a medium-low temperature zone. Background technique [0002] As a natural resource produced by the earth's ecosystem, wood is a negative carbon building material, because wood products solidify more carbon than it releases during production and use. Therefore, using more wood in building materials will help to suppress CO in the atmosphere. 2 The growth of the content of phosphate slows down the trend of global warming, which is of great significance to the survival and development of human beings. With the continuous development of wood processing technology, glued wood has become the best product to replace traditional solid wood sawn timber products. Glulam is a large cross-section component made by rationally using smaller cross-section wood to make laminate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 岳孔周俊陆伟东郝胜群刘伟庆程秀才贾翀汤丽娟
Owner NANJING TECH UNIV
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