Method for determining carbonization depth of orthogonal laminated wood floor slab under condition of laminate falling

A determination method and technology of glulam, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve the problems of carbonization speed change, layer shedding, complex carbonization depth calculation, etc., to achieve the effect of accurate carbonization depth

Pending Publication Date: 2019-07-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For cross-laminated timber floor slabs, due to the carbonization of the fire and the shedding of the laminates, the carbonization speed changes during the fire process, and the calculation of the carbonization depth is more complicated

Method used

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  • Method for determining carbonization depth of orthogonal laminated wood floor slab under condition of laminate falling
  • Method for determining carbonization depth of orthogonal laminated wood floor slab under condition of laminate falling
  • Method for determining carbonization depth of orthogonal laminated wood floor slab under condition of laminate falling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A three-layer cross-glued wood board with a fire exposure time of 75 minutes and a laminate thickness of 35 mm is selected for carbonization depth calculation. The cross-sectional dimensions are as follows: image 3 shown.

[0038] 1. Compare the thickness h of the CLT laminate with 25mm;

[0039] 2. Comparing the thickness of the laminate with 25mm, calculate the time t required for carbonization of each laminate fi :

[0040] The thickness of the laminate is greater than 25mm, and the carbonization speed of the first laminate is β 0 (0.65mm / min), the carbonization speed of subsequent laminates is maintained at 2β before the carbonization depth of the laminates reaches 25mm 0 remains unchanged, when the carbonization depth reaches 25mm, the carbonization speed decreases to β 0 , and maintain this carbonization speed to continue carbonization until the layers fall off.

[0041]

[0042] 3. According to the fire exposure time t and the time t required for carboni...

Embodiment 2

[0050] A five-layer cross-glued wood board with a fire exposure time of 75 minutes and a laminate thickness of 21 mm is selected for carbonization depth calculation. The cross-sectional dimensions are as follows: Figure 4 shown.

[0051] 1. Compare the thickness h of the CLT laminate with 25mm;

[0052] 2. Comparing the thickness of the laminate with 25mm, calculate the time t required for carbonization of each laminate fi :

[0053] The thickness of the laminate is less than 25mm, and the carbonization speed of the first laminate is β 0 (0.65mm / min), the carbonization speed of subsequent laminates is maintained at 2β 0 Unchanged, when the carbonization depth reaches 21m, the laminate occurs.

[0054]

[0055] 3. The fire time t of the root and the carbonization time t of each laminate fi , to calculate the shedding number of laminates during the fire exposure process:

[0056]

[0057] 4. Will and Compare the size and calculate the carbonization depth:

[00...

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Abstract

The invention discloses a method for determining the carbonization depth of an orthogonal laminated wood floor slab under the condition of laminate falling, which is characterized by comprising the following steps of: establishing a charring speed simplification model; calculating the number of falling layers of the laminate according to the established carbonization speed simplification model; and calculating the carbonization depth according to the number of the falling layers of the laminates. Compared with the prior art, the increase of the carbonization speed caused by the falling of thelaminate and the heat insulation protection effect caused by the carbonization layer are considered, the carbonization depth is more accurate compared with the calculation of the one-dimensional carbonization rate of solid wood, the errors of the obtained calculation value and test value are basically within 10%, and the errors are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a method for determining the carbonization depth of a cross-glued wood floor in consideration of the shedding of the laminate. Background technique [0002] Cross-laminated timber is an engineered wood panel product that is composed of at least three layers of solid wood sawn timber or structural composite panels that are orthogonally assembled and pressed with structural adhesives. With the increasing application of cross-laminated timber in medium and high-rise wooden structures, the research on its fire resistance has attracted the attention of engineering designers. For cross-laminated wood floor slabs, due to carbonization after fire, and the shedding of laminates, the carbonization speed changes during the fire process, and the calculation of carbonization depth is more complicated. As an important load-bearing component, the cross-laminated wood floor sla...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20Y02E50/10
Inventor 张晋吴磊
Owner SOUTHEAST UNIV
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