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Nondestructive detection method for mechanical properties of larch component material of historic building

A technology of larch wood and material mechanics, which is applied in the field of wood science, can solve problems such as the failure to meet the mechanical properties testing requirements of wooden components of ancient buildings, and achieves the effects of simple operation, high testing accuracy and reliable data support.

Inactive Publication Date: 2011-09-07
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

This detection method cannot meet the requirements for the detection of mechanical properties of wooden components in ancient buildings.

Method used

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specific Embodiment 1

[0033] In an ancient wooden structure building in Beijing, the size of a larch beam (width × height × length) is 120 × 200 × 1800mm. The beam bears the bending deformation load, and the stress in the middle part is the largest, so the mechanical properties of the material need to be tested. The stress wave propagation speed is 4.478km / s after the stress wave detection; the resistance value is 46Resi through the micro-drilling detection. After calculation, the elastic modulus of the material at this part is 9.1GPa, the bending strength is 64.4MPa, and the compressive strength is 53.1MPa.

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Abstract

The invention relates to a nondestructive detection method for mechanical properties of a larch component material of a historic building. In the method provided by the invention, a stress wave propagation technique and a micro-drill resistance technique are utilized, and the elastic modulus, bending strength and compressive strength of the detected part material of the larch component are obtained by measuring and computing the stress wave speed v and micro-drill resistance value F of a detected part. The nondestructive detection method provided by the invention has the following characteristics and effects: (1) the two types of measurement signals, namely stress waves and micro-drill resistance are combined to measure the mechanical properties of the larch component material, and the detection accuracy is higher than the that of the single stress wave or micro-drill resistance signal; (2) the method has the advantages of strong portability, simplicity in operation and the like; (3) the nondestructive detection method is suitable for the field detection of the historic building, and the main mechanical property index of the detected part material are nondestructively and rapidly obtained; (4) the nondestructive detection method provides a reliable data support for the maintenance and repair of the historic building in a larch structure; and (5) the detection method is suitable for the mechanical property detection of larch component materials of other three types.

Description

technical field [0001] The invention relates to a non-destructive detection method for the mechanical properties of larch wood component materials in ancient buildings, belonging to the field of wood science and technology. Background technique [0002] The mechanical properties of wood components in ancient buildings include elastic modulus, flexural strength, and compressive strength. And the elastic modulus has a statistical linear relationship with the flexural strength and compressive strength. Most of the main load-bearing components such as beams and columns of ancient wooden structures in Beijing in the Ming and Qing Dynasties are made of larch. Using non-destructive methods to quickly detect the mechanical properties of larch wood components at the site of ancient wooden structures is the premise and basis for formulating protection and repair plans for ancient wooden structures. [0003] The traditional testing of mechanical properties of wood is mostly carried o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07G01N3/00
Inventor 张厚江朱磊孙燕良闫海成王喜平吴江刘西瑞
Owner BEIJING FORESTRY UNIVERSITY
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