CN104181040B - A kind of residue Compressive Bearing Capacity assay method of ancient building timber compoment - Google Patents

Abstract

The residue Compressive Bearing Capacity assay method that the present invention relates to a kind of ancient building timber compoment, belongs to wood science and engineering technical field. First the standard small specimen of ancient building to be measured is tested, obtained mean value, stress wave propagation velocity of wave and the compression strength of micro-brill Resistance Value of standard small specimen; Taking micro-brill Resistance Value and stress wave propagation velocity of wave as independent variable, compression strength is carried out to regression analysis, obtain fitting parameter value, pass through Site Detection, the non-destructive of obtaining ancient building timber compoment to be measured detects data, calculates the residue Compressive Bearing Capacity of ancient building timber compoment according to non-destructive detection data. The inventive method can be calculated the residue Compressive Bearing Capacity of ancient building full size timber compoment accurate and effective and quantitatively, and measurement result can provide reliable Data support for the formulation of historic building structure protection and the scheme of repairerment.

Description

A kind of residue Compressive Bearing Capacity assay method of ancient building timber compoment

Technical field

The residue Compressive Bearing Capacity assay method that the present invention relates to a kind of ancient building timber compoment, belongs to wood science and engineering technologyField.

Background technology

At present, due to portability, the detection range applicability of non-destructive resistance dynamometer and stress wave testing equipment with can operateProperty, and be widely used in the residue mechanics Performance Detection of ancient building member and the aspect such as reconnoitre. But also there is certain limitation, there is following problem in property: the carrying out of (1) destructive testing. Due to the historical relic attribute of ancient building timber compoment, can be forRaw material in the Mechanics Performance Testing of full size timber compoment are very limited, cause often only relying on the test of non-destructive resistance dynamometer and answerThe residue Compressive Bearing Capacity of evaluating qualitatively ancient building full size timber compoment is tested in Reeb, cannot accomplish qualitative assessment. (2) manyDivision between individual cellular zone. For ancient building timber compoment, often adopt single interval stress wave test and impedance instrument test resultCarry out the Evaluating Mechanical Properties of ancient building timber compoment, longitudinally only comprise a pair of stress wave test point and edge along full size timber compomentOn full size timber compoment section girth, only arrange a pair of impedance instrument test point, cause single interval prediction result and full size timber compomentBetween actual density, elastic modelling quantity and bearing capacity, there is larger error.

Summary of the invention

The object of the invention is to propose a kind of residue Compressive Bearing Capacity assay method of ancient building timber compoment, to overcome prior artWeak point, proposes a kind of assessment method of new ancient building timber compoment Compressive Bearing Capacity, with accurate quantitative analysis assess ancient buildingThe residue Compressive Bearing Capacity of middle timber compoment.

The residue Compressive Bearing Capacity assay method of the ancient building timber compoment that the present invention proposes, comprises the following steps:

(1) damaged timber compoment ancient building to be measured being replaced is processed into standard small specimen, and standard small specimen is of a size of 20× 20 × 30mm, carries out physical and mechanical property test to standard small specimen, obtains micro-brill Resistance Value flat of standard small specimenAverage F, stress wave propagation velocity of wave v and compression strength f;

(2), taking above-mentioned micro-brill Resistance Value and stress wave propagation velocity of wave as independent variable, above-mentioned compression strength is returned pointAnalyse, obtain fitting parameter value A, B:f=A+BFv²；

(3) by Site Detection, the non-destructive of obtaining ancient building timber compoment to be measured detects data, and detailed process is as follows:

(3-1) arrange that along the surface longitudinal of ancient building timber compoment to be measured k is to test point, test stress ripple is along every pair of test respectivelyPut the stress wave propagation velocity of wave of path direction, get the mean value of the stress wave propagation velocity of wave of k to test point, as ancient architecture to be measuredBuild the stress wave propagation velocity of wave v of timber compoment₁；

(3-2) in the cross-sectional circumferential of ancient building timber compoment to be measured, be evenly arranged i to radial symmetric test point, by each surveyPilot is divided into n interval to the distance of cross-section center, forms n annulus, each annulus from cross section top layer to the center of circleArea be designated as A_g(g＝1,……,n)；

(3-3) measure respectively the micro-brill Resistance Value curve of each test point to the cross section center of circle, each Resistance Value curve is dividedFor n interval, obtain this interval mean resistance value according to the Resistance Value curve in each interval, by micro-brill of all test pointsThe mean value of the mean resistance value in Resistance Value curve between same zone, as the Resistance Value of corresponding annulus, is designated as F_g(g＝1,……,n)；

(4) stress wave propagation velocity of wave v step (3-1) being obtained₁, the annulus that obtains of step (3-3) Resistance Value F_gIn the regression equation of substitution step (2), obtain the compression strength f of each annulus_g(g＝1,……,n)，Respectively by the area A of the compression strength of each annulus and this corresponding annulus_gMultiply each other, the residue that calculates ancient building timber compoment is anti-Pressure bearing capacity is: $\underset{g=1}{\overset{n}{\mathrm{\Σ}}}{f}_g{A}_g.$

The residue Compressive Bearing Capacity assay method of the ancient building timber compoment that the present invention proposes, its advantage is: assay method of the present inventionUtilize the basic database of foundation and the residue resistance to compression carrying that on-the-spot non-destructive detects to calculate ancient building full size timber compomentPower, the test of non-destructive stress wave, the test of impedance instrument and the destructive intensity test result of comprehensive standard small specimen are builtVertical basic database, the accuracy of the result therefore detecting than independent dependence non-destructive is higher; In assay method of the present inventionOn-the-spot test is easy and simple to handle and quick, only relates to nondestructive micro-damage impedance instrument test and the test of nondestructive stress measurement ripple, thereforeCan effectively protect ancient building not because detection is damaged; Assay method of the present invention is drawn the cross section of ancient building timber compomentBe divided between multiple cellular zones, calculate respectively the compression strength between each cellular zone, can calculate accurate and effective and quantitatively ancientThe residue Compressive Bearing Capacity of building full size timber compoment. The measurement result that assay method of the present invention obtains can be ancient building wood knotThe formulation of structure protection and the scheme of repairerment provides reliable Data support.

Brief description of the drawings

Fig. 1 is the signal of longitudinal k of arranging of the surface along ancient building timber compoment to be measured that relates in the inventive method to test pointFigure.

Fig. 2 is the A-A cutaway view of Fig. 1, and Fig. 2 is illustrated in cross-sectional circumferential and is evenly arranged i to radial symmetric test point.

Detailed description of the invention

The residue Compressive Bearing Capacity assay method of the ancient building timber compoment that the present invention proposes, comprises the following steps:

(1) damaged timber compoment ancient building to be measured being replaced is processed into standard small specimen, and standard small specimen is of a size of 20× 20 × 30mm, carries out physical and mechanical property test to standard small specimen, obtains micro-brill Resistance Value flat of standard small specimenAverage F, stress wave propagation velocity of wave v and compression strength f;

(2), taking above-mentioned micro-brill Resistance Value and stress wave propagation velocity of wave as independent variable, above-mentioned compression strength is returned pointAnalyse, obtain fitting parameter value A, B:f=A+BFv², in an embodiment of the inventive method, fitting parameter valueA＝7.125、B＝15.911：f＝7.125+15.911Fv²。

(3) by Site Detection, the non-destructive of obtaining ancient building timber compoment to be measured detects data, and detailed process is as follows:

(3-1) arrange that along the surface longitudinal of ancient building timber compoment to be measured k is to test point, as shown in Figure 1, test stress respectivelyRipple, along the stress wave propagation velocity of wave of every pair of test point path direction, is got the mean value of the stress wave propagation velocity of wave of k to test point,As the stress wave propagation velocity of wave v of ancient building timber compoment to be measured₁；

(3-2) in the cross-sectional circumferential of ancient building timber compoment to be measured, be evenly arranged i to radial symmetric test point, i.e. cross sectionOn girth, there is 2i test point, for example, in the time of i=6, on section girth, have 12 test points, as shown in Figure 2, willEach test point is divided into n interval to the distance of cross-section center, forms n annulus from cross section top layer to the center of circle, everyThe area of individual annulus is designated as A_g(g=1 ..., n), in Fig. 2, each test point is divided into the distance of cross-section center5 intervals, form 5 annulus from cross section top layer to the center of circle, the area of each annulus is designated as A_g(g＝1,……,5)。

(3-3) measure respectively the micro-brill Resistance Value curve of each test point to the cross section center of circle, each Resistance Value curve is dividedFor n interval, obtain this interval mean resistance value according to the Resistance Value curve in each interval, by micro-brill of all test pointsThe mean value of the mean resistance value in Resistance Value curve between same zone, as the Resistance Value of corresponding annulus, is designated as F_g(g＝1,……,n)；

(4) stress wave propagation velocity of wave v step (3-1) being obtained₁, the annulus that obtains of step (3-3) Resistance Value F_gIn the regression equation of substitution step (2), obtain the compression strength f of each annulus_g(g＝1,……,n)，Respectively by the area A of the compression strength of each annulus and this corresponding annulus_gMultiply each other, the residue that calculates ancient building timber compoment is anti-Pressure bearing capacity is:For example,, as the corresponding compression strength f of each annulus_g(g=1 ..., 5) beBy compression strength corresponding each annulus and its area A_gMultiply each other, calculate ancient building woodThe residue Compressive Bearing Capacity of memberIt is 50,000 Ns.

Claims (1)

1. a residue Compressive Bearing Capacity assay method for ancient building timber compoment, is characterized in that the method comprises the following steps:

(1) damaged timber compoment ancient building to be measured being replaced is processed into standard small specimen, and standard small specimen is of a size of 20× 20 × 30mm, carries out physical and mechanical property test to standard small specimen, obtains micro-brill Resistance Value flat of standard small specimenAverage F, stress wave propagation velocity of wave v and compression strength f;

(2) taking the mean value of above-mentioned micro-brill Resistance Value and stress wave propagation velocity of wave as independent variable, above-mentioned compression strength is enteredLine retrace is analyzed, and obtains fitting parameter value A, B:f=A+BFv²；

(3) by Site Detection, the non-destructive of obtaining ancient building timber compoment to be measured detects data, and detailed process is as follows:

(3-1) arrange that along the surface longitudinal of ancient building timber compoment to be measured k is to test point, test stress ripple is along every pair of test respectivelyPut the stress wave propagation velocity of wave of path direction, get the mean value of the stress wave propagation velocity of wave of k to test point, as ancient architecture to be measuredBuild the stress wave propagation velocity of wave v of timber compoment₁；

(3-2) in the cross-sectional circumferential of ancient building timber compoment to be measured, be evenly arranged i to radial symmetric test point, by each surveyPilot is divided into n interval to the distance of cross-section center, forms n annulus, each annulus from cross section top layer to the center of circleArea be designated as A_g(g＝1,……,n)；

(3-3) measure respectively the micro-brill Resistance Value curve of each test point to the cross section center of circle, each Resistance Value curve is dividedFor n interval, obtain this interval mean resistance value according to the Resistance Value curve in each interval, by micro-brill of all test pointsThe mean value of the mean resistance value in Resistance Value curve between same zone, as the Resistance Value of corresponding annulus, is designated as F_g(g＝1,……,n)；

(4) stress wave propagation velocity of wave v step (3-1) being obtained₁, the annulus that obtains of step (3-3) Resistance Value F_gIn the regression equation of substitution step (2), obtain the compression strength f of each annulus_g(g＝1,……,n)，Respectively by the area A of the compression strength of each annulus and this corresponding annulus_gMultiply each other, the residue that calculates ancient building timber compoment is anti-Pressure bearing capacity is: