A method for calculating the compressive strength of wood cross-grained pin grooves
A technology of compressive strength and calculation method, applied in the direction of instruments, geometric CAD, electrical digital data processing, etc., can solve the problem that the calculated value cannot fully reflect the actual value of the compressive strength of wood horizontal grain pin grooves, etc., so that the calculated value is reliable and applicable Effect
Active Publication Date: 2022-08-02
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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[0008] The purpose of the present invention is to provide a calculation method for the bearing strength of wood cross-grain pin grooves, so as to solve the problem that the calculated value obtained by the existing calculation method cannot fully reflect the actual value of the bearing strength of wood cross-grain pin grooves
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Embodiment 1
[0053] see Figure 1 to Figure 15 , the general situation of the stress on the horizontal grain of the wooden structure pin connection is as follows figure 1 shown.
[0054] The wood cross-grained pin groove pressure specimen is a bending specimen, and the test method is as follows figure 2 As shown, the specifications of the wood cross-grained pin groove pressure specimen are as follows: 4d≤h e ≤0.7h, h-h e ≥4d, span l≥3h, 1.5d≤b≤4d; the loading method can be monotonic incremental loading, controlled in about 5min to make the specimen reach the failure state; the maximum load at the time of failure of the specimen is defined as the pin groove bearing load. The main steps are as follows:
[0055] ① According to the specifications of the test piece, make the wood cross-grained pin groove pressure-bearing test piece. The diameter of the pin hole is larger than the pin diameter, but its value is not greater than 0.1 times the pin diameter; then the test piece is placed in a ...
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The invention provides a method for calculating the compressive strength of a transverse-grained pin groove of wood, comprising the following steps: based on a theoretical calculation model for local compression of transverse-grained wood, for a compression-bending test piece of a transverse-grained pin groove of wood, establishing a transverse-grained pin Theoretical calculation model of groove compressive strength; considering the influence of Hertzian contact behavior and the friction between pins and wood on the compressive strength of wood cross-grain pin grooves, according to Weibull statistical distribution theory, a correction function is obtained to construct wood cross-grain pin groove bearing Theoretical calculation model of compressive strength; considering the effect of effective loading height, the calculation formula of compressive strength of wood cross-grained pin grooves is further optimized. The method for testing the compressive strength of the wood cross-grain pin grooves involved in the present invention is completely consistent with the actual stress state when the wood cross-grain pin grooves are under pressure, and can correctly reflect the true value of the compressive strength of the wood cross-grain pin grooves; The calculation method of the compressive strength of wood cross-grained pin grooves has considered the influence of all parameters, and it is in good agreement with the measured values, and the calculated values are reliable and applicable.
Description
technical field [0001] The invention relates to the technical field of pin-bolt connection of wood structures, in particular to a method for calculating the compressive strength of transverse-grained pin grooves of wood. Background technique [0002] The compressive strength of the timber dowel groove is a decisive parameter for the calculation of the bearing capacity of the European yield mode of the doweled connection of the timber structure. At present, there are half-hole method and full-hole method for measuring the bearing strength of wood pin grooves through experiments. During the test of the half-hole method, the pin cannot be bent, and the loading surface directly acts on the pin on the half-hole to perform flat pressure and test. The method is simple and easy to implement, and the error of the test result is small. Since the pin does not bend during the test process, the test result can accurately reflect the pressure bearing characteristics of the entire pin groo...
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IPC IPC(8): G06F30/17G06F119/14
CPCG06F30/17G06F2119/14
Inventor 冯新陈伯望肖宏彬
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY