CN117574520A - Method for designing reinforcing rib column member based on high-strength stirrup and high-strength concrete - Google Patents
Method for designing reinforcing rib column member based on high-strength stirrup and high-strength concrete Download PDFInfo
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- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 34
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000013461 design Methods 0.000 claims abstract description 24
- 238000004364 calculation method Methods 0.000 claims abstract description 15
- 239000004567 concrete Substances 0.000 claims description 12
- 239000003351 stiffener Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 2
- 238000000547 structure data Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G06F30/00—Computer-aided design [CAD]
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
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Abstract
The invention belongs to the field of civil engineering structure data processing, and particularly relates to a method for designing a reinforcing rib column member based on high-strength stirrups and high-strength concrete for square members. The invention comprises the following steps: s1, calculating the minimum hoop matching rate of a reinforcing rib column member added with high-strength hoops and high-strength concrete; s2, calculating a reference threshold Z C The method comprises the steps of carrying out a first treatment on the surface of the S3, comparing and adjusting. The invention has the advantages of simple calculation flow and accurate data, solves the problem that the existing reinforcing rib column component adopting high-strength stirrups and high-strength concrete lacks an applicable calculation formula or even a design flow in design checking calculation, simultaneously ensures a lower distribution rate construction effect under the same strength, has higher cost performance, and provides a practical reference for practical engineering application of the high-strength stirrups combined with the high-strength concrete.
Description
Technical Field
The invention belongs to the field of civil engineering structure data processing, and particularly relates to a method for designing a reinforcing rib column member based on high-strength stirrups and high-strength concrete for square members.
Background
In recent years, with the demands of people for super high-rise buildings and large-span buildings, development of construction technology and high-efficiency materials is promoted. Among them, high-strength concrete plays an important role. However, the present state of the art is that the high strength of concrete is not fully developed at present, and the brittleness performance of concrete after the high strength is mainly developed. After the stress-strain curve of the high-strength concrete member reaches the peak stress of the peak, the curve drop section is very steep, and the curve is brittle failure, which is not allowed in structural design. In addition, the configuration of stirrups and longitudinal bars can effectively play a role in constraining core concrete, however, considering that the existing high-strength steel bars, particularly steel bars with higher yield strength of 500MPa and above, are not currently listed in the specification, the situation that the ratio is available without reference when the situation is encountered is caused, and related operation data is lacking, namely the existing common formula is more suitable for common steel bars and is not suitable for high-strength steel. In view of this, the applicant has filed an invention patent entitled "a reinforcing bar column member based on high-strength stirrups" which can maximally exert the strength performance of high-strength reinforcing bars.
However, the above description is presently more directed to a structural reinforcement post member formed after a high strength stirrup is mated with conventional concrete; although the common concrete theory is mature, along with the implementation of policies such as energy conservation, emission reduction, low carbon targets and the like in recent years in China, research and development and application of high-strength concrete materials are also gradually emphasized, but the theory of high-strength concrete structures still needs to be further developed at present, and research on high-strength concrete members is still in a research stage. So far, when the high-strength concrete is adopted, as the high-strength concrete has the advantages and disadvantages which are obviously higher than those of the conventional concrete, how to develop a reinforcing rib column component based on the high-strength stirrups and the high-strength concrete so as to fill the blank of the area, and solve the problem that the existing reinforcing rib column component adopting the high-strength stirrups and the high-strength concrete lacks an applicable calculation formula or even a design flow in design checking calculation. Finally, the cost performance is guaranteed, and meanwhile, a practical reference is provided for practical engineering application of the high-strength stirrups combined with high-strength concrete, particularly for building application with anti-seismic design requirements, and the technical problem to be solved in the field in recent years is urgently solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a method for designing a reinforcing rib column member based on high-strength stirrups and high-strength concrete, which has the advantages of simple calculation flow and accurate data, solves the problem that the existing reinforcing rib column member adopting the high-strength stirrups and the high-strength concrete lacks an applicable design formula or even a design flow in design checking calculation, simultaneously ensures a lower distribution ratio construction effect under the same strength, has higher cost performance, and provides a practical reference for the application of the high-strength stirrups combined with the high-strength concrete in practical engineering.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the method for designing the reinforcing rib column member based on the high-strength stirrup and the high-strength concrete is characterized by comprising the following steps of:
s1, calculating the minimum hooping rate of the reinforced rib column member added with the high-strength hooping and the high-strength concrete according to the following formulaβ：
Wherein:
f c the concrete compressive strength standard value of the reinforcing rib column member serving as the square column member;
f y the yield strength of the high-strength stirrup;
k e is a shape factor;
s2, calculating a reference threshold Z according to the calculation result of the step S1, wherein the reference threshold Z is calculated according to the following formula C ：
Wherein:
E S the elastic modulus of the high-strength stirrup;
s3, whenb/b’＜Z C When the design requirement is met; when (when)b/b’≥Z C When it is, decreasebUp to the value ofb/b’＜Z C The method comprises the steps of carrying out a first treatment on the surface of the Wherein,bfor the cross-sectional width of the stiffener post member,b’is the width of the core area of the reinforcing rib column component.
Preferably, the form factork e The values of (2) are as follows:
wherein:
s is the distance between adjacent high-strength stirrups in the reinforcing rib column member.
Preferably, the yield strength of the high-strength stirrup is 600MPa to 750MPa.
The invention has the beneficial effects that:
based on the design blank of the square member based on the high-strength stirrup and the high-strength concrete, the invention provides a method for designing a reinforcing rib column member based on the high-strength stirrup and the high-strength concrete. In actual design, the first step is to perform initial calculation with the minimum hooping rate beta, so as to aim at reasonably calculating the material proportion and ensure that the self strength performance of the high-strength stirrup is exerted to the maximum. In the first step, after the minimum hoop allocation rate is definitely determined, the corresponding high-strength hoops can be naturally configured, and finally the member can meet the initial use requirement. In fact, the highest value of the hoop matching rate is theoretically infinite and is limited only by the production cost, namely, the higher the hoop matching rate is, the cost naturally rises, so that the minimum hoop matching rate is preferentially calculated, the cost is minimized while the performance of the component is ensured, the cost performance is ensured, and the effect of saving steel and the consumption of the component is finally achieved. And in the second step, defining a reference threshold value by using the minimum hoop matching rate, and assisting in the subsequent comparison of the ratio of the section width to the core area width and even in later adjustment so as to realize the purpose of rapidly designing the whole reinforcing rib column member. In the adjustment process, the shape coefficient is not changed by changing the width of the cross section, and the calculated minimum hoop matching rate is not changed, so that the design requirement can be met in a simplest way.
The invention has the advantages of simple calculation flow and accurate data, solves the problem that the existing reinforcing rib column component adopting the high-strength stirrups and the high-strength concrete lacks an applicable design formula or even a design flow in design checking calculation, simultaneously ensures a lower distribution rate construction effect under the same strength, has higher cost performance, and provides a practical reference for the application of the high-strength stirrups combined with the high-strength concrete in practical engineering.
Drawings
FIG. 1 is a schematic diagram of a cross-section of embodiment 1;
fig. 2 is a schematic view of the longitudinal section of embodiment 1.
The actual correspondence between each label and the component name of the invention is as follows:
10-column body; 20-high-strength stirrups; 30-longitudinal ribs.
Detailed Description
For ease of understanding, the specific implementation of the present invention is further described herein below with reference to FIGS. 1-2:
the invention relates to a reinforcing rib column component based on high-strength stirrup and high-strength concrete, which comprises a column body 10 provided with high-strength concrete, and a built-in high-strength stirrup 20 and a longitudinal rib 30. As can be seen from fig. 1-2, the high strength stirrups 20 are circumferentially distributed along the column body 10, and each longitudinal rib 30 is formed by extending axially along the column body 10. When the high-strength stirrup 20 is selected, a high-strength steel bar with the yield strength of 600MPa to 750MPa can be adopted; of course, lower strength can also meet the design requirements.
In the concrete calculation, the design flow of the whole structure comprises the following steps:
the minimum hoop matching rate beta of the reinforced rib column member added with the high-strength hooping 20 and the high-strength concrete and the minimum ratio of the section width to the core area width are obtained by the following formula:
on the basis, the following needs to be satisfied:
when the above-mentioned requirements are not met, it is indicated that the current design does not meet the design requirements, and the requirements are reducedbUntil the above conditions are satisfied.
And wherein:
f c the concrete compressive strength standard value of the reinforcing rib column member serving as the square column member;
f y is the yield strength of the high strength stirrup 20;
k e the values for the form factor are as follows:
bthe cross-sectional width of the reinforcing rib column member;
b’is the width of the core area of the reinforcing rib column component.
Thus, the high-strength stirrup 20 and the longitudinal bar 30 and high-strength concrete-equipped reinforcing bar column member can be formed.
Example 1
For a further understanding of the present invention, one embodiment of the present invention is given herein in conjunction with the foregoing and with reference to experimental data as follows:
the column body 10 is made of concrete materials with the actual-measured axial compressive strength of 100MPa, and high-strength stirrups 20 and longitudinal bars 30 are arranged in the column body 10 to form a test piece.
Four reinforcing bars with 20mm measured strength of 450MPa are adopted as the longitudinal bars 30, and the actual reinforcing rate is 3.6%. The column body 10 has square cross section, 235mm×235mm cross section, 1400mm height, 195mm core area width, and the tensile strength of the high-strength stirrup 20 is taken asf ty =770MPa。
At the same time, the form factor given by the present inventionk e Is obtained by the calculation formula of (2)k e = 0.434267, substituting the calculation formula of the minimum fitting rate β, to obtain:
and (3) calculating:
β=0.029513。
for further verification, the same brand of high strength stirrups 20 and longitudinal bars 30 are tested and verified for the A column (area hooping ratio is 0.01454, i.e. less than 0.029513), the B column (area hooping ratio is 0.017164, i.e. less than 0.029513), the C column (area hooping ratio is 0.020109, i.e. less than 0.029513), and the D column (area hooping ratio is 0.030164, i.e. greater than 0.029513), respectively;
since only the D column satisfies this condition, then according to the actual collar ratio of the D column, the formula is applied:
and (3) calculating:
b/b’＜1.217413。
due to the D columnb/b’=235/195=1.205, clearly indicating that the design requirements are met.
Furthermore, for further illustration, all test pieces were each subjected to test and finite element analysis studies to obtain load strain gauges as shown in tables 1 to 4 below, specifically as follows:
TABLE 1A column load strain gage
TABLE 2B column load strain gage
TABLE 3C column load strain gage
TABLE 4D column load strain gage
Wherein epsilon represents the concrete axle center compression real-time compression strain value of the test piece, and P represents the real-time bearing capacity of the test piece.
From the load strain gauges of the respective test pieces shown in tables 1 to 4, it can be seen that:
compared with the A column, the B column and the C column, the ductility of the D column is obviously improved, the loads of the three columns except the A column are obviously secondarily increased, but only the secondary rising peak value of the D column is larger than the primary rising peak value, and the design accuracy of the invention is also proved. That is, the design method of the invention can effectively improve the ductility and the secondary peak stress of the component simultaneously provided with the high-strength steel bars and the high-strength concrete.
It will be understood by those skilled in the art that the present invention is not limited to the details of the foregoing exemplary embodiments, but includes the same or similar manner which may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
The technical sections of the present invention that are not described in detail are known in the art.
Claims (3)
1. The method for designing the reinforcing rib column member based on the high-strength stirrup and the high-strength concrete is characterized by comprising the following steps of:
s1, calculating the minimum hooping rate of the reinforced rib column member added with the high-strength hooping and the high-strength concrete according to the following formulaβ：
Wherein:
f c the concrete compressive strength standard value of the reinforcing rib column member serving as the square column member;
f y the yield strength of the high-strength stirrup;
k e is a shape factor;
s2, calculating a reference threshold Z according to the calculation result of the step S1, wherein the reference threshold Z is calculated according to the following formula C ：
Wherein:
E S the elastic modulus of the high-strength stirrup;
s3, whenb/b’＜Z C When the design requirement is met; when (when)b/b’≥Z C When it is, decreasebUp to the value ofb/b’＜Z C The method comprises the steps of carrying out a first treatment on the surface of the Wherein,bfor the cross-sectional width of the stiffener post member,b’is the width of the core area of the reinforcing rib column component.
2. The method for designing the reinforcing rib column member based on the high-strength stirrup and the high-strength concrete according to claim 1, wherein the method comprises the following steps: form factork e The values of (2) are as follows:
wherein:
s is the distance between adjacent high-strength stirrups in the reinforcing rib column member.
3. The method for designing a reinforcing rib column member based on high-strength stirrup and high-strength concrete according to claim 1 or 2, characterized in that: the yield strength of the high-strength stirrup is 600MPa to 750MPa.
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