CN110441140B - Method for analyzing stress performance of stainless steel reinforced concrete column - Google Patents
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Abstract
The invention provides an analysis method of the stress performance of a stainless steel reinforced concrete column, which comprises the steps of establishing a stress performance test of the stainless steel reinforced concrete eccentric stressed column, checking whether the flat section hypothesis of the stainless steel reinforced concrete eccentric stressed member is established or not, analyzing a deflection curve, midspan lateral deflection and the change rule of longitudinal steel bar strain, checking a bearing capacity theoretical formula of the stainless steel reinforced concrete biased column, and giving a calculation formula of the average crack spacing of a test piece of the stainless steel reinforced concrete biased column and a member characteristic coefficient suggested value; the analysis method of the invention establishes the calculation method of the bearing capacity of the stainless steel reinforced concrete column by comparing the damage form, the deflection curve, the crack development and the longitudinal steel bar strain of the stainless steel reinforced concrete bias test piece under the change of the reinforcement ratio and the loading eccentricity and discussing the calculation of the bearing capacity and the crack width, can provide theoretical basis for the design of the stainless steel reinforced concrete structure and has better development and application prospects.
Description
Technical Field
The invention relates to the field of stainless steel reinforced concrete, in particular to a method for analyzing the stress performance of a stainless steel reinforced concrete column.
Background
Since the end of the 19 th century, reinforced concrete is widely applied to engineering construction of basic facilities such as hydraulic structures, marine structures, roads and bridges, and the like, because of a multiphase and uneven system formed by reinforced concrete structures and the promotion effect of concrete carbonization corrosion on the corrosion process of reinforcing steel bars, the corrosion of the reinforcing steel bars becomes a main factor of the degradation of the stress performance of reinforced concrete members.
The stainless steel bars have many similar places with the common hot rolled steel bars, and have certain differences, so that the research on the stainless steel reinforced concrete structure is necessary, and the improvement on the durability of the reinforced concrete structure in China is greatly influenced. At present, the research on stainless steel bars is started late in China, most of the research on the stainless steel bars at home and abroad is focused on the corrosion resistance of the stainless steel bars, the research on the stress performance of a stainless steel reinforced concrete structure is less, and the research on the stress performance of a stainless steel reinforced concrete member has important academic significance and practical value, so the invention provides an analysis method for the stress performance of the stainless steel reinforced concrete column to solve the defects in the prior art.
Disclosure of Invention
Aiming at the problems, the invention provides an analysis method of the stress performance of the stainless steel reinforced concrete column, the analysis method can verify that the distribution of the strain along the section height of the midspan section of the stainless steel reinforced concrete bias test piece in the stress process basically conforms to the assumption of a flat section, the damage form, the deflection curve, the crack development and the longitudinal steel bar strain of the stainless steel reinforced concrete bias test piece are compared under the change of the reinforcement ratio and the loading eccentricity, the calculation of the bearing capacity and the crack width is discussed, the calculation method of the bearing capacity of the stainless steel reinforced concrete column is established, the theoretical basis can be provided for the design of the stainless steel reinforced concrete structure, and the method has better development and application prospects.
The invention provides a method for analyzing the stress performance of a stainless steel reinforced concrete column, which comprises the following steps:
the method comprises the following steps: the method comprises the steps of establishing a stress performance test of the stainless steel reinforced concrete eccentric compression column by using a stainless steel bar test piece, a concrete eccentric compression test piece, a strain gauge, a pressure testing machine and a pressure sensor, measuring the compression strength of concrete, the axial compressive strength and the axial tensile strength of the concrete calculated by the compression strength, and comparing and analyzing the damage forms and crack development conditions of the stainless steel reinforced concrete eccentric compression column and the common reinforced concrete eccentric compression column;
step two: according to the test result, checking whether the assumption of the flat section of the eccentric compression member of the stainless steel reinforced concrete is established or not;
step three: analyzing deflection curves, mid-span lateral deflection and change rules of longitudinal reinforcement strain of the eccentric stressed column of the stainless steel reinforced concrete under different longitudinal reinforcement ratios and loading eccentricity and the contrast difference with the common carbon reinforced concrete bias column;
step four: comparing and checking, and checking the theoretical formula of the bearing capacity of the stainless steel reinforced concrete bias column;
step five: and comparing the crack development rule of the stainless steel reinforced concrete bias column under the conditions of different longitudinal bar reinforcement ratios and loading eccentricity, and providing a calculation formula of the average crack spacing of the stainless steel reinforced concrete bias column test piece and a member characteristic coefficient suggested value.
The further improvement lies in that: and when a stress performance test of the stainless steel reinforced concrete eccentric compression column is established in the first step, selecting 2304 stainless steel bars with the diameters of 12mm, 16mm and 25mm and HRB400 steel bars with the diameter of 16mm to respectively manufacture 3 test pieces.
The further improvement lies in that: when the stress performance test of the stainless steel reinforced concrete eccentric compression column is established in the first step, the concrete eccentric compression test pieces are all formed by pouring the same batch of C30 commercial concrete.
The further improvement lies in that: and calculating formulas of the compressive strength and the tensile strength of the concrete axle center in the first step are shown as formulas (1) and (2).
The further improvement lies in that: when a stress performance test of the stainless steel reinforced concrete eccentric compression column is established in the first step, an accompanying test block and a temperature compensation test block are required to be added, 3 groups of standard cubic test blocks of 150mm multiplied by 150mm are reserved for each concrete eccentric compression test block while the concrete eccentric compression test block is poured, a proper amount of release agent is uniformly brushed on the inner wall of the prepared standard cubic test mold, then, a temperature compensation steel bar which is simultaneously pasted with a member longitudinal bar strain gauge is obliquely placed into the standard concrete eccentric compression test block, so that the temperature compensation steel bar is superposed with a diagonal line of the test mold and one end of the temperature compensation steel bar is exposed out of the test mold, and finally, the accompanying test block, the temperature compensation test block and the member are simultaneously poured by using the same batch of concrete.
The further improvement lies in that: and when the flat section is assumed in the step two, the tension side of the stainless steel reinforced concrete eccentric compression column is uniformly arranged along the height of the section by adopting concrete strain gauges with the interval of 75mm and the compression side with the interval of 50 mm.
The further improvement lies in that: in the fourth step, the concrete crushing of the pressure zone of the stainless steel reinforced concrete bias pressure column marks that the small eccentric pressure test piece reaches the limit, and the large eccentric pressure test piece has one of the following phenomena in the loading or load holding process, namely that the test piece reaches or exceeds the bearing capacity limit state:
for the reinforcing steel bar with obvious physical flow limit, the main bar in the tension area is subjected to yielding, and the strain reaches 0.01; for stainless steel bars without obvious physical flow limit, the strain of the main bar in the tension area reaches 0.01;
the main ribs in the tension area are broken;
the maximum crack width of the concrete corresponding to the gravity center position of the main reinforcement in the tension area reaches 1.5 mm;
mid-span deflection reaches 1/50 of span;
and the concrete in the compression area of the test piece is damaged by compression.
The further improvement lies in that: the calculation formula of the average crack spacing of the stainless steel reinforced concrete bias column test piece in the fifth step is shown as a formula (3):
wherein beta is 1.1 for a shaft center tensile test piece, and beta is 1.0 for other stress test pieces; rhoteThe reinforcement ratio of the longitudinal reinforcement is calculated according to the effective cross section area.
The invention has the beneficial effects that: the analysis method provided by the invention can verify that the distribution of the strain along the height of the cross section of the cross-center section of the stainless steel reinforced concrete bias test piece basically conforms to the assumption of a flat section in the stress process, the damage form, the deflection curve, the crack development and the longitudinal steel bar strain of the stainless steel reinforced concrete bias test piece are compared under the change of the reinforcement ratio and the loading eccentricity, the calculation of the bearing capacity and the crack width is discussed, the calculation method of the bearing capacity of the stainless steel reinforced concrete column is established, the theoretical basis can be provided for the design of the stainless steel reinforced concrete structure, and the method has a good development application prospect.
Drawings
FIG. 1 is a schematic diagram of a test loading and measuring device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of the arrangement of a strain gage and a displacement meter of a test piece according to an embodiment of the invention.
FIG. 3 is a schematic diagram of load-midspan deflection curves under different eccentricities in the embodiment of the present invention.
FIG. 4 is a schematic diagram illustrating a relationship between load-midspan lateral deflection at the same eccentricity and eccentricity in the embodiment of the present invention.
Detailed Description
In order to enhance the understanding of the present invention, the present invention will be further described with reference to the following examples, which are only illustrative and not intended to limit the scope of the present invention.
According to the illustrations in fig. 1, 2, 3, and 4, the embodiment provides a method for analyzing stress performance of a stainless steel reinforced concrete column, which includes the following steps:
the method comprises the following steps: a stainless steel bar concrete eccentric compression column stress performance test is established by utilizing a stainless steel bar test piece, a concrete eccentric compression test piece, a strain gauge, a pressure testing machine and a pressure sensor, the compression strength of concrete, the axial compressive strength and the axial tensile strength of the concrete calculated by the compression strength are measured, the damage forms and crack development conditions of the stainless steel bar concrete eccentric compression column and a common reinforced concrete eccentric compression column are contrastively analyzed, when the stainless steel bar concrete eccentric compression column stress performance test is established, 2304 stainless steel bars with the diameters of 12mm, 16mm and 25mm and HRB400 steel bars with the diameter of 16mm are selected to respectively manufacture 3 test pieces, the concrete eccentric compression test pieces are formed by pouring the same batch of C30 commercial concrete, when the stainless steel bar concrete eccentric compression column stress performance test is established, an accompanying test block and a temperature compensation test block are required to be added, when concrete eccentric compression test pieces are poured, 3 groups of standard cubic test pieces of 150mm multiplied by 150mm are reserved for each concrete eccentric compression test piece, a proper amount of release agent is uniformly brushed on the inner wall of the prepared standard cubic test mould, then, temperature compensation steel bars which are simultaneously pasted and manufactured with the member longitudinal bar strain gauge are obliquely placed into the standard concrete eccentric compression test piece test mould, the temperature compensation steel bars are superposed with the diagonal line of the test mould, one end of the temperature compensation steel bars is exposed out of the test mould, finally, the accompanying test pieces, the temperature compensation test pieces and the members are simultaneously poured by the same batch of concrete, and the calculation formulas of the compressive strength and the tensile strength of the concrete axis are shown as formulas (1) and (2);
the statistics of the mechanical indexes of various types of steel bars are shown in table 1:
TABLE 1 Reinforcement mechanics index statistics
The actual compressive strength of the concrete cubes in this example is shown in table 2:
TABLE 2 concrete mechanics index statistics of test pieces
Note: 1.
the compressive strength of the concrete is actually measured;
2.
the compressive strength of the concrete axle center is calculated according to the actually measured compressive strength of the concrete;
3.
the tensile strength of the concrete axle center is calculated according to the actually measured compressive strength of the concrete.
Step two: according to the test result, whether the plane section hypothesis of the stainless steel reinforced concrete eccentric compression member is established or not is checked, and when the plane section hypothesis is established, the concrete strain gauges with the interval of 75mm are adopted on the tension side and the interval of 50mm are adopted on the compression side of the stainless steel reinforced concrete eccentric compression column and are uniformly arranged along the height of the section;
2304 the measured parameters of the stainless steel reinforced concrete bias test piece are shown in table 3, and the test results of the bias test piece are shown in table 4:
TABLE 3 bias test piece actual measurement parameter table
Note: 1.e0The initial eccentricity of the test piece during loading;
2.fcu、fc [52]respectively calculating the actual measured concrete cubic compressive strength and the concrete axle center compressive strength;
3.fylongitudinal steel bar yield strength;
4.Asand A's [65]Are respectively in tensionThe cross-sectional areas of the longitudinal steel bars at the side and the compression side;
5. the data in the table are all the average values measured in the test.
TABLE 4 bias test specimen test result table
Injecting; 1. rhosAnd ρ'sRespectively setting the longitudinal bar reinforcement ratio of the tension side and the compression side of the test piece;
2.Ncr、Nuf is the cracking load, the breaking load and the lateral deformation of the middle point of the column during the breaking of the test piece respectively;
3.εcu、εsand epsilon'sRespectively the average strain of the concrete, the tensile longitudinal bar and the compressive longitudinal bar of the damaged section when the test piece reaches the limit;
4. strain values in table: the + number indicates tension and the-number indicates compression.
Step three: analyzing deflection curves, mid-span lateral deflection and change rules of longitudinal reinforcement strain of the eccentric stressed column of the stainless steel reinforced concrete under different longitudinal reinforcement ratios and loading eccentricity and the contrast difference with the common carbon reinforced concrete bias column;
under different longitudinal bar reinforcement ratios, the curve of the relative axial force to mid-span lateral deflection of the bias test piece is shown in fig. 3, the relationship between the mid-span lateral deflection and the eccentricity when the bias test piece is damaged is shown in fig. 4, the lateral deflection of the small bias test piece is far smaller than that of the large bias test piece under the condition that the eccentric load values are the same for the test pieces with the same longitudinal bar reinforcement ratio and the same concrete strength; the development of the deflection of the test piece is intensified along with the increase of the eccentricity; with the increase of the eccentricity, the mid-span deflection of the test piece is increased when the test piece is damaged;
step four: comparing and checking, checking the theoretical formula of the bearing capacity of the stainless steel reinforced concrete biasing column, wherein when concrete in a compression area of the stainless steel reinforced concrete biasing column is crushed, a small eccentric compression test piece reaches the limit, and when a large eccentric compression test piece is loaded or held, one of the following phenomena appears, namely, the test piece reaches or exceeds the bearing capacity limit state:
for the reinforcing steel bar with obvious physical flow limit, the main bar in the tension area is subjected to yielding, and the strain reaches 0.01; for stainless steel bars without obvious physical flow limit, the strain of the main bar in the tension area reaches 0.01;
the main ribs in the tension area are broken;
the maximum crack width of the concrete corresponding to the gravity center position of the main reinforcement in the tension area reaches 1.5 mm;
mid-span deflection reaches 1/50 of span;
the concrete in the compression area of the test piece is damaged by compression;
the process of checking the theoretical formula is as follows: selecting a Rasmussen model and a double-inclined-line model which are optimized aiming at the stainless steel bar as constitutive models of the stainless steel bar, and then correcting a part with yield strength greater than nominal yield strength, wherein the mathematical expression is shown as a formula (4):
wherein the content of the first and second substances,
σ0.01is the corresponding stress value when the residual strain of the steel bar is 0.01 percent, E0.2Is the slope of the tangent to the nominal yield strength point location,
the mathematical expression of the double-slope model is shown in formula (5):
wherein E is0Is the initial elastic modulus, sigma, of the stainless steel barpyIs residual strain of stainless steel bar, epsilonpy＝0.002，σ0.2Is 0.2 percent of residual stainless steel barsNominal yield stress value, epsilon, corresponding to residual strain0.2Strain corresponding to nominal yield stress of stainless steel bar, ES1The slope between two points of nominal yield strength and ultimate strength on the stress-strain curve of the stainless steel bar is shown;
taking the average value of the characteristic value of the tensile curve of the stainless steel bars from each correlation coefficient value of the stainless steel bars, substituting the average value into formulas (4) and (5) to obtain two constitutive model expressions of the stainless steel bar material, wherein the constitutive model expressions are shown as formulas (6) and (7), and the normal section bearing capacity calculation formula of the stainless concrete biased column test piece with the rectangular section is shown as a formula (8):
rasmussen model:
double oblique line model:
step five: comparing the crack development law of the stainless reinforced concrete bias column under the conditions of different longitudinal bar reinforcement ratios and loading eccentricity, and providing a calculation formula of the average crack spacing of the stainless reinforced concrete bias column test piece and a suggested value of the member characteristic coefficient, wherein the calculation formula of the average crack spacing of the stainless reinforced concrete bias column test piece is shown as a formula (3):
wherein beta is 1.1 for a shaft center tensile test piece, and beta is 1.0 for other stress test pieces; rhoteThe reinforcement ratio of the longitudinal reinforcement is calculated according to the effective cross section area;
the calculated average crack spacing for the test pieces is shown in table 5:
TABLE 5 average crack spacing calculation results
Note: 1.
respectively measuring the maximum crack spacing and the minimum crack spacing of the concrete;
2.
the measured average crack spacing of the concrete is obtained;
3.
calculated values are the average crack spacing of the concrete.
From Table 1, it can be seen that the stainless steel reinforced concrete was biased to the test piece
The average value mu of (1) is 1.71, the coefficient of variation xi is 0.064,
average value of (1), mu is 0.73, coefficient of variation, xi is 0.075;
comparing SC6 and HC9, it can be seen that, for two test pieces with the same reinforcement ratio and the same eccentricity, the average crack spacing of the stainless steel reinforced concrete biased test piece is larger than that of the ordinary reinforced concrete biased test piece, which indicates that the configuration of the stainless steel bars may cause the increase of the average crack spacing of the test pieces, and the difference may be related to the following factors:
the thickness of the concrete protective layer is greatly uneven in the manufacturing process of the test piece, the thickness of the protective layer at different sections of the same test piece is not completely the same, even the thickness of the protective layer at different longitudinal ribs of the same section is different, and the difference of the average crack spacing of the test piece can be caused;
only considering the thickness c of the concrete protective layer and the diameter d of the longitudinal bar when calculating the average crack spacing by a standard formulaeqAnd reinforcement ratio rhoteThe elastic modulus of the stainless steel bars is far smaller than that of the common carbon steel bars, the surface bonding force of the stainless steel bars and the concrete is slightly different from that of the common steel bars, and the difference of the average crack spacing can also be caused;
the non-uniformity of the concrete properties and the influence of human factors during the observation of the crack spacing in the test process may cause the deviation of the measured average crack spacing.
Calculating the maximum crack width of the stainless steel reinforced concrete bias test piece under the quasi-permanent combination according to a formula (9), and taking a stress characteristic coefficient suggested value alphacr2.7, the calculation results are shown in table 6;
TABLE 6 maximum crack Width calculation results for quasi-permanent combinations
The analysis method provided by the invention can verify that the distribution of the strain along the section height of the midspan section of the stainless steel reinforced concrete bias test piece basically conforms to the assumption of a flat section in the stress process, and by comparing the damage form, the deflection curve, the crack development and the longitudinal steel bar strain of the stainless steel reinforced concrete bias test piece under the change of the reinforcement ratio and the loading eccentricity, the calculation of the bearing capacity and the crack width is discussed, and the calculation method of the bearing capacity of the stainless steel reinforced concrete column is established, so that a theoretical basis can be provided for the design of the stainless steel reinforced concrete structure, and the method has a good development application prospect.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The method for analyzing the stress performance of the stainless steel reinforced concrete column is characterized by comprising the following steps of:
the method comprises the following steps: the method comprises the steps of establishing a stress performance test of the stainless steel reinforced concrete eccentric compression column by using a stainless steel bar test piece, a concrete eccentric compression test piece, a strain gauge, a compression testing machine and a pressure sensor, measuring the compression strength of concrete, the compression strength of the axis of the concrete and the tensile strength of the axis of the concrete calculated by the compression strength, and comparing and analyzing the damage forms and crack development conditions of the stainless steel reinforced concrete eccentric compression column and the common reinforced concrete eccentric compression column;
step two: according to the test result, checking whether the assumption of the flat section of the stainless steel reinforced concrete eccentric compression member is established or not;
step three: analyzing the deflection curve, mid-span lateral deflection and change rule of longitudinal reinforcement strain of the eccentric stressed column of the stainless steel reinforced concrete under different longitudinal reinforcement ratios and loading eccentricity and the contrast difference with the common carbon reinforced concrete bias column;
step four: comparing and checking, and checking a bearing capacity theoretical formula of the stainless steel reinforced concrete bias column;
step five: comparing the crack development law of the stainless steel reinforced concrete bias column under the conditions of different longitudinal bar reinforcement ratios and loading eccentricity, and giving a calculation formula of the average crack spacing of the test piece of the stainless steel reinforced concrete bias column and a member characteristic coefficient suggested value;
when a stress performance test of the stainless steel reinforced concrete eccentric compression column is established in the first step, 2304 stainless steel bars with the diameters of 12mm, 16mm and 25mm and HRB400 steel bars with the diameter of 16mm are selected to respectively manufacture 3 test pieces;
when a stress performance test of the stainless steel reinforced concrete eccentric compression column is established in the first step, an accompanying test block and a temperature compensation test block are required to be added, 3 groups of standard cubic test blocks of 150mm multiplied by 150mm are reserved for each concrete eccentric compression test block while the concrete eccentric compression test block is poured, a proper amount of release agent is uniformly brushed on the inner wall of a prepared standard cubic test mold, then, a temperature compensation steel bar which is simultaneously pasted and manufactured with a member longitudinal bar strain gauge is obliquely placed into the standard concrete eccentric compression test block, so that the temperature compensation steel bar is superposed with a diagonal line of the test mold and one end of the temperature compensation steel bar is exposed out of the test mold, and finally, the accompanying test block, the temperature compensation test block and the member are simultaneously poured by using the same batch of concrete;
the calculation formula of the average crack spacing of the stainless steel reinforced concrete bias column test piece in the fifth step is shown as a formula (3):
wherein, beta is 1.1 for the axial tension test piece, beta is 1.0 for other stress test pieces, and rho isteThe reinforcement ratio of the longitudinal reinforcement is calculated according to the effective cross-sectional area, c is the thickness of the concrete protective layer, deqThe diameter of the longitudinal ribs.
2. The method for analyzing the stress performance of the stainless steel reinforced concrete column according to claim 1, wherein the method comprises the following steps: when the stress performance test of the stainless steel reinforced concrete eccentric compression column is established in the first step, the concrete eccentric compression test pieces are all formed by pouring the same batch of C30 commercial concrete.
3. The method for analyzing the stress performance of the stainless steel reinforced concrete column according to claim 1, wherein the method comprises the following steps: the calculation formulas of the compressive strength and the tensile strength of the concrete axle center in the first step are shown as formulas (1) and (2):
wherein the content of the first and second substances,
in order to obtain the compressive strength of the concrete,
is the axial compressive strength of concrete, ft tThe tensile strength of the concrete axle center.
4. The method for analyzing the stress performance of the stainless steel reinforced concrete column according to claim 1, wherein the method comprises the following steps: and when the flat section is assumed in the step two, the tension side of the stainless steel reinforced concrete eccentric compression column is uniformly arranged along the height of the section by adopting concrete strain gauges with the interval of 75mm and the compression side with the interval of 50 mm.
5. The method for analyzing the stress performance of the stainless steel reinforced concrete column according to claim 1, wherein the method comprises the following steps: in the fourth step, the fact that the concrete in the compression area of the stainless steel reinforced concrete biasing column is crushed indicates that the small eccentric compression test piece reaches the limit, and one of the following phenomena occurs in the loading or load holding process of the large eccentric compression test piece, namely the test piece reaches or exceeds the bearing capacity limit state:
(1) for the reinforcing steel bar with obvious physical flow limit, the main bar in the tension area is subjected to yielding, and the strain reaches 0.01; for stainless steel bars without obvious physical flow limit, the strain of the main bar in the tension area reaches 0.01;
(2) the main ribs in the tension area are broken;
(3) the maximum crack width of the concrete corresponding to the gravity center position of the main reinforcement in the tension area reaches 1.5 mm;
(4) mid-span deflection reaches 1/50 of span;
(5) and the concrete in the compression area of the test piece is damaged by compression.
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