CN117521195A - Guardrail reinforcement method and method for checking matching with cantilever plate by using reinforcement - Google Patents
Guardrail reinforcement method and method for checking matching with cantilever plate by using reinforcement Download PDFInfo
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Abstract
The invention provides a guardrail reinforcement method and a method for checking matching with a cantilever plate by using the reinforcement, wherein parameters are input into a data input module, and the diameter d of a guardrail reinforcement required by calculation is calculated through the reinforcement module 2 According to d 2 Determining reinforcement of the guardrail with reinforcement parameters; meanwhile, cantilever plate parameters are input into the data input module, and the diameter d of the guardrail stirrup is matched 2 The bearing capacity M of the cantilever plate is checked through the checking module n Sum of bending moment M borne by cantilever plate u ，M n >M u And judging that the bridge deck cantilever calculation meeting requirements are met. Through integrating data input module, reinforcement module, check module in a database, realize that the user can automatic design guardrail reinforcement and check the matching nature of guardrail and bridge deck cantilever through the less parameter of input, improved guardrail reinforcement design security, realized design, check integration.
Description
Technical Field
The invention belongs to the technical field of bridge guardrails, and particularly relates to a guardrail reinforcement method and a method for checking matching with a cantilever plate by using the reinforcement.
Technical Field
The bridge concrete F-shaped guardrail is an important guardrail form commonly used in highway bridges and is characterized by belonging to a rigid guardrail, and is free from deformation in collision accidents, and the absorption and transfer of collision energy are realized in the forms of vehicle climbing, guiding, deformation, friction between contact surfaces and the like. The concrete F-shaped guardrail has high rigidity, has remarkable blocking effect on vehicles and has good stability on vehicles after collision. The slope of the upper part of the collision face is larger, so that the situation that the vehicle climbs over the guardrail can be effectively avoided, the slope of the lower part of the collision face is smaller, and the slope is mainly used for guiding the accident vehicle to vertically lift along the guardrail, so that the initial kinetic energy of the accident vehicle is converted into gravitational potential energy.
Based on experience, the relevant specifications specify the form of the impact surface of the concrete F-shaped guardrail and the corresponding height of different anti-collision grades, but the specific reinforcement is not given. Resulting in many concrete F-shaped guardrails, while constructed to meet regulatory requirements, are not matched with the corresponding grade of the guardrail, deck cantilever, etc. Different designers are different in reinforcement form, the diameters of the selected reinforcing bars are different, and the condition that the reinforcement of the guardrail and the cantilever reinforcement of the bridge deck are not matched often occurs, so that the accuracy and rationality of the reinforcement drawing of the guardrail are difficult to ensure, and huge potential safety hazards are brought to driving. Therefore, an automatic reinforcement and checking method is urgently needed to be provided in the bridge concrete F-shaped guardrail design process, so that a complex design calculation flow is simplified, guardrail design safety is guaranteed, design and checking integration is realized, and design efficiency is improved.
Disclosure of Invention
In order to solve the problems, the invention provides a guardrail reinforcement method and a method for checking matching with a cantilever plate by using the reinforcement. The guardrail reinforcement can be automatically designed by utilizing a program by inputting a small amount of parameters, the matching property of the guardrail and the cantilever plate is checked, the design efficiency is finally improved, the design safety of the guardrail is ensured, and the driving safety is improved.
The technical problems to be solved by the invention are realized by adopting the following technical scheme:
a guardrail reinforcement method is characterized in that parameters are input into a data input module, and the required diameter d of a guardrail stirrup is calculated and calculated through a reinforcement module 2 According to d 2 Determining reinforcement of the guardrail with reinforcement parameters;
the data input module is a functional module for acquiring design parameters input by a user, wherein the design parameters comprise section construction parameters and reinforcement parameters;
the section construction parameters comprise a guardrail grade M and a guardrail transverse collision load standard value R of the automobile w Longitudinal length L of collision load distribution t The height H, the width B and the axial compressive strength standard f of the concrete guard rail ck ；
The reinforcement parameters comprise the diameter d of the longitudinal reinforcement of the guardrail 1 Vertical spacing L of longitudinal ribs of guardrail 1 Longitudinal reinforcement spacing L of guardrail stirrups 2 Thickness C of guard bar reinforcement protective layer 1 Standard value f of yield strength of guardrail steel bar yk ；
The reinforcement module derives and calculates the required diameter d of the guardrail stirrup according to the section construction parameters and reinforcement parameters in the data input module 2 。
The invention further discloses the following technology:
preferably, the guardrail is bridge concrete F-shaped guardrail, and the guardrail grade M comprises A, SB, SA, SS, HB, HA grades.
Preferably, the parameters in the data input module are unique design parameters set for the bridge concrete F-shaped guardrail, and the bridge concrete F-shaped guardrail is formed together.
Preferably, in the reinforcement parameters, the diameter d of the longitudinal reinforcement of the guardrail 1 Vertical spacing L of guardrail longitudinal bars of 12mm 1 100-150 mm, and the longitudinal bar spacing L of the guardrail stirrups 2 Guard bar reinforcement layer thickness C of =150-250 mm 1 Standard value f of yield strength of guardrail steel bar with the diameter of 45-50 mm yk ＝400MPa。
Preferably, the reinforcement module is implemented by the following steps:
step 1, segmenting the section of the guardrail by adopting a segmentation method, wherein the segmentation method of the guardrail is as follows: the guardrail structure analyzed by the data input module divides the irregular guardrail structure section into 3 parts including an upper part, a middle part and a lower part. Each section captures parameters of each section, denoted as { I } 1 ,I 2 ,I 3 Particularly included is the top width B tn Bottom width B bn Cross-sectional height H mn The expression is marked as I n ＝{B tn ,B bn ,H mn }，n＝1～3；
Step 2, calculating the bending bearing moment of the vertical shaft of each part, which is marked as M wn ，M wn Calculated by the formula (1);
in the formula (1):
a s1 taking 67-70 mm for the distance from the center of the longitudinal steel bar of the guardrail to the surface of the concrete;
S wn is the section height H mn In the range, the total area of longitudinal ribs of the collision surface guardrail;
step 3, the damage forms of the bridge guardrails are divided into two types, wherein the first damage form occurs at the bottom O of the height H of the guardrails, and the second damage form occurs at the inflection point of the impact faceAt Q. In the first form of failure, the bending moment of the guardrail about the vertical axis is noted as M w ' the bending load moment of the guardrail about the vertical shaft is recorded as M under the second damage form and is calculated by the formula (2) w "is calculated from formula (3);
M w ′＝M w1 +M w2 +M w3 (2)
M w ″＝M w1 +M w2 (3)
step 4, bending bearing moment M of the guardrail about the vertical shaft under the first damage form w ' calculating the critical length L of the guardrail damage under the first damage form c Bending load moment M' and bridge longitudinal axis c ' calculated by formulas (4) and (5);
step 5, bending bearing moment M of the guardrail about the vertical shaft under the second damage form w Calculating critical length L of guardrail damage under second damage form c "bending bearing moment M with longitudinal axis of bridge c "is calculated from formulas (6) and (7);
step 6, comparing M c ' and M c Maximum value is taken as bending bearing moment M of bridge longitudinal axis c ；
Step 7, under the first destructive form, defining parameters B', H by internal customization m ' calculated from formulas (8), (9), the second breakIn bad form, parameters B', H m "calculated from formulae (10), (11);
H m ′＝H m1 +H m2 +H m3 (9)
H m ″＝H m1 +H m2 (11)
step 8, M obtained according to step 6 c Parameters B', H obtained in step 7 m ′、B″、H m Calculating the total area s 'of the guardrail stirrup under the first damage form and the total area s' of the guardrail stirrup under the second damage form according to the formulas (12) and (13);
step 9, taking the maximum value in s ', s' to be s, and the diameter d 2 Calculated from formula (14);
in formula (14):
s is the total area of the guardrail stirrup within the range of 1m in the longitudinal direction;
a s2 the distance from the center of the guardrail stirrup to the concrete surface is 53-55 mm;
step 7, taking the maximum value of the diameters of the guardrail stirrups obtained under the first and second destructive forms, and adopting the principle of rounding upwards to obtain an integer value as the final diameter d of the guardrail stirrups 2 。
The invention also provides a method for checking the matching of the reinforcement bars and the cantilever plates, which is used for inputting parameters of the cantilever plates in the data input module and matching the diameter d of the guardrail stirrups 2 The bearing capacity M of the cantilever plate is checked through the checking module n Sum of bending moment M borne by cantilever plate u ，M n ＞M u Judging that the bridge deck cantilever calculation meets the requirement;
the cantilever plate parameters comprise the thickness D of the cantilever plate, the thickness C of the cantilever plate reinforcing steel protective layer, the diameter D of the cantilever plate transverse reinforcing steel, and the distance L from the calculated section of the cantilever plate to the collision face of the guardrail ds Standard value f of yield strength of cantilever plate transverse steel bar yk b Standard value f of axial compressive strength of cantilever plate ck b ；
The checking module specifically adopts the following steps:
step 1, according to the calculated diameter d of the guardrail stirrup 2 Calculating the bending load moment M of the longitudinal axis of the bridge under the first damage mode c ，M c Calculated from formula (15);
step 2, calculating the bearing capacity M of the cantilever plate n ，M n Calculated from formulas (16) to (19);
in the formulas (16) to (19):
L ds for calculating the distance from the section to the collision face of the guardrail;
t is the axial tension in the bridge deck caused by collision load;
h 0 the effective height of the cross section of the bridge deck;
A s the area of the transverse steel bars in the range of each linear meter of the longitudinal direction of the bridge deck slab is;
x is the height of the concrete compression area of the cantilever plate;
step 3, calculating the sum M of bending moments born by the cantilever plate u ，M u Calculated from formulas (20), (21):
M u ＝M cu +M s +M b (20)
in the formulas (20), (21):
M cu calculating the longitudinal bearing moment of the guardrail at the section of the bridge deck;
M s the bending moment caused by the cantilever plate gravity at the calculated section is calculated by a program according to the guardrail and cantilever plate structure;
M b the bending moment caused by the gravity of the guardrail at the calculated section is calculated by a program according to the construction of the guardrail;
step 4, M n ＞M u Judging that the requirements of the bearing capacity of the guardrail are met;
M n <M u judging that the cantilever plate reinforcement needs to be reinforced, readjusting the diameter d of the transverse reinforcement of the cantilever plate, and solving again until M n ＞M u 。
The beneficial technical effects of the invention are as follows:
(1) According to the guardrail reinforcement method and the method for checking matching with the cantilever plate by utilizing the reinforcement, the data input module, the reinforcement module and the checking module are integrated in the database, so that a user can automatically design the reinforcement of the guardrail and check the matching of the guardrail and the cantilever of the bridge deck by inputting fewer parameters.
(2) According to the guardrail reinforcement method and the method for matching the reinforcement check with the cantilever plate, a designer does not need to carry out complex manual calculation and check, so that the error probability is reduced, the complex concrete F-shaped guardrail reinforcement design calculation flow is simplified, the guardrail reinforcement design safety is improved, and the design and check integration is realized.
(3) According to the guardrail reinforcement method and the method for checking the matching of the reinforcement and the cantilever plate, the check module can be used for checking the matching of the guardrail and the cantilever plate, so that blind improvement of the bearing capacity of the guardrail by a designer is avoided, the matching of the bearing capacity of the guardrail and the cantilever plate under collision load is ignored, the knowledge of the designer on the guardrail reinforcement design is greatly improved, the accuracy of reinforcement calculation is improved, the design is guided better, and the driving safety is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art;
FIG. 1 is a logic flow diagram of the present invention;
FIG. 2 is a schematic diagram of a data input module according to the present invention;
FIG. 3 is a diagram showing parameters of the guardrail according to the present invention;
FIG. 4 is a schematic view of a barrier failure mode of the present invention;
FIG. 5 is a schematic diagram of relevant parameters in the segmentation method employed in the calculation module of the present invention;
FIG. 6 is a schematic diagram of parameters related to the calculation of cantilever plate according to the present invention;
Detailed Description
The invention is further described in the following with reference to specific embodiments in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Examples
The invention provides an SS-level bridge concrete F-shaped guardrail for an actual engineering project, and adopts the invention to carry out automatic reinforcement and check, and the steps are as follows:
1. as shown in fig. 1 and 2, the data input module is firstly entered to input section construction parameters, reinforcement parameters and cantilever plate parameters, wherein the section construction parameters comprise guardrail grade SS grade, and automobile transverse collision load standard value R of the guardrail w =520 kN, longitudinal length of collision load distribution L t 2.4m, guardrail height h=110 cm, guardrail width b=52.5 cm; concrete guardrail axle center compressive strength standard value f ck =20.1 MPa; the reinforcement parameters comprise the diameter d of the longitudinal reinforcement of the guardrail 1 Vertical spacing L of guardrail longitudinal bars of 12mm 1 125mm, longitudinal bar spacing L of guardrail stirrup 2 =0.200m, guard bar reinforcement thickness C 1 =45 mm; yield strength standard value f of guardrail longitudinal bar yk =400 MPa; the cantilever plate parameters comprise the thickness D=200mm of the cantilever plate, the thickness C=30mm of the cantilever plate reinforcement protection layer, the diameter d=16mm of the cantilever plate transverse reinforcement, and the distance L from the calculated section of the cantilever plate to the collision face of the guardrail ds Standard value f of yield strength of transverse steel bar of cantilever plate with the thickness of being=0 and 500mm yk b 400MPa and standard value f of axial compressive strength of cantilever plate ck b ＝22.4MPa；
2. As shown in fig. 1, 3, 4 and 5, after data input is completed, the data input enters a calculation module, the calculation module adopts a segmentation method to segment the section of the guardrail, and automatically calculates the bending bearing moment M of the guardrail about the vertical axis w Critical length of barrier failure L c Bending bearing moment M of guardrail about bridge longitudinal axis c The calculation result derived Excel table is shown in table 1:
table 1: m is M w 、L c 、M c Calculation form
3. First kindM in destructive mode c Maximum value, therefore, the diameter d of the guardrail stirrup is carried out in the first failure mode 2 The calculation result derived Excel table is shown in table 2:
table 2: s, d 2 Calculation form
4. Diameter d of guardrail stirrup 2 Carry rounding, take d 2 ＝16mm；
5. As shown in fig. 1 and 6, the diameter d of the guardrail stirrup 2 After the calculation is completed, the cantilever plate calculation module is entered, and the bearing capacity M of the cantilever plate is automatically calculated n Sum of bending moment M borne by cantilever plate u The calculation result derived Excel table is shown in table 3.
Table 3: bridge deck cantilever calculation form
M n ＞M u And judging that the bridge deck cantilever calculation meeting requirements are met.
The foregoing has outlined and described the basic principles, main features and features 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, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A guardrail reinforcement method is characterized in that parameters are input into a data input module, and the reinforcement module is used for calculating the required diameter d of a guardrail reinforcement 2 According to d 2 Determining reinforcement of the guardrail with reinforcement parameters;
the data input module is a functional module for acquiring design parameters input by a user, wherein the design parameters comprise section construction parameters and reinforcement parameters;
the section construction parameters comprise a guardrail grade M and a guardrail transverse collision load standard value R of the automobile w Longitudinal length L of collision load distribution t The height H, the width B and the axial compressive strength standard f of the concrete guard rail ck ；
The reinforcement parameters comprise the diameter d of the longitudinal reinforcement of the guardrail 1 Vertical spacing L of longitudinal ribs of guardrail 1 Longitudinal reinforcement spacing L of guardrail stirrups 2 Thickness C of guard bar reinforcement protective layer 1 Standard value f of yield strength of guardrail steel bar yk ；
The reinforcement module derives and calculates the required diameter d of the guardrail stirrup according to the section construction parameters and reinforcement parameters in the data input module 2 。
2. A method of reinforcing a guardrail as claimed in claim 1, wherein: the guardrail is bridge concrete F-shaped guardrail, and the guardrail grade M comprises A, SB, SA, SS, HB, HA grades.
3. A method of reinforcing a guardrail as claimed in claim 2, wherein: and the parameters in the data input module are unique design parameters set for the bridge concrete F-shaped guardrail, so that the bridge concrete F-shaped guardrail is formed together.
4. A method of reinforcing a guardrail as claimed in claim 1, wherein:
in the reinforcement parameters, the diameter d of the longitudinal reinforcement of the guardrail 1 Vertical spacing L of guardrail longitudinal bars of 12mm 1 100-150 mm, and the longitudinal bar spacing L of the guardrail stirrups 2 Guard bar reinforcement layer thickness C of =150-250 mm 1 Standard value f of yield strength of guardrail steel bar with the diameter of 45-50 mm yk ＝400MPa。
5. A method of reinforcing a guardrail as claimed in claim 1, wherein:
the reinforcement module is carried out by adopting the following steps:
step 1, segmenting the section of the guardrail by adopting a segmentation method, wherein the segmentation method of the guardrail is as follows: the guardrail structure analyzed by the data input module divides the irregular guardrail structure section into 3 parts including an upper part, a middle part and a lower part. Each section captures parameters of each section, denoted as { I } 1 ,I 2 ,I 3 Particularly included is the top width B tn Bottom width B bn Cross-sectional height H mn The expression is marked as I n ＝{B tn ,B bn ,H mn }，n＝1～3；
Step 2, calculating the bending bearing moment of the vertical shaft of each part, which is marked as M wn ，M wn Calculated by the formula (1);
in the formula (1):
a s1 taking 67-70 mm for the distance from the center of the longitudinal steel bar of the guardrail to the surface of the concrete;
S wn is the section height H mn In the range, the total area of longitudinal ribs of the collision surface guardrail;
step 3, the damage forms of the bridge guardrails are divided into two types, wherein the first damage form occurs at the bottom O of the height H of the guardrails, and the second damage form occurs at the inflection point Q of the collision face. In the first form of failure, the bending moment of the guardrail about the vertical axis is noted as M w ' the bending load moment of the guardrail about the vertical shaft is recorded as M under the second damage form and is calculated by the formula (2) w "is calculated from formula (3);
M w ′＝M w1 +M w2 +M w3 (2)
M w ″＝M w1 +M w2 (3)
step 4, bending bearing moment M of the guardrail about the vertical shaft under the first damage form w ' calculate the firstCritical length L of guardrail damage under damage form c Bending load moment M' and bridge longitudinal axis c ' calculated by formulas (4) and (5);
step 5, bending bearing moment M of the guardrail about the vertical shaft under the second damage form w Calculating critical length L of guardrail damage under second damage form c "bending bearing moment M with longitudinal axis of bridge c "is calculated from formulas (6) and (7);
step 6, comparing M c ' and M c Maximum value is taken as bending bearing moment M of bridge longitudinal axis c ；
Step 7, under the first destructive form, defining parameters B', H by internal customization m 'calculated from formulae (8), (9), parameters B', H in the second destructive form m "calculated from formulae (10), (11);
H m ′＝H m1 +H m2 +H m3 (9)
H m ″＝H m1 +H m2 (11)
step 8, M obtained according to step 6 c Parameters B', H obtained in step 7 m ′、B″、H m Calculating the total area s of the guardrail stirrup under the first damage form according to the formulas (12) and (13) ′ The total area s' of the guardrail stirrup in the second failure mode;
step 9, taking s ′ The maximum value in s ", denoted s, diameter d 2 Calculated from formula (14);
in formula (14):
s is the total area of the guardrail stirrup within the range of 1m in the longitudinal direction;
a s2 the distance from the center of the guardrail stirrup to the concrete surface is 53-55 mm;
step 7, taking the maximum value of the diameters of the guardrail stirrups obtained under the first and second destructive forms, and adopting the principle of rounding upwards to obtain an integer value as the final diameter d of the guardrail stirrups 2 。
6. The method for checking the matching of the cantilever plate by using the reinforcement is characterized by comprising the following steps of: inputting cantilever plate parameters in a data input module, and matching with the diameter d of the guardrail stirrup 2 The checking module is used for checking the bearing of the cantilever plateLoad capacity M n Sum of bending moment M borne by cantilever plate u ，M n ＞M u Judging that the bridge deck cantilever calculation meets the requirement;
the cantilever plate parameters comprise the thickness D of the cantilever plate, the thickness C of the cantilever plate reinforcing steel protective layer, the diameter D of the cantilever plate transverse reinforcing steel, and the distance L from the calculated section of the cantilever plate to the collision face of the guardrail ds Standard value f of yield strength of cantilever plate transverse steel bar yk b Standard value f of axial compressive strength of cantilever plate ck b ；
The checking module specifically adopts the following steps:
step 1, according to the calculated diameter d of the guardrail stirrup 2 Calculating the bending load moment M of the longitudinal axis of the bridge under the first damage mode c ，M c Calculated from formula (15);
step 2, calculating the bearing capacity M of the cantilever plate n ，M n Calculated from formulas (16) to (19);
in the formulas (16) to (19):
L ds for calculating the distance from the section to the collision face of the guardrail;
t is the axial tension in the bridge deck caused by collision load;
h 0 the effective height of the cross section of the bridge deck;
A s the area of the transverse steel bars in the range of each linear meter of the longitudinal direction of the bridge deck slab is;
x is the height of the concrete compression area of the cantilever plate;
step 3, calculating the sum M of bending moments born by the cantilever plate u ，M u Calculated from formulas (20), (21):
M u ＝M cu +M s +M b (20)
in the formulas (20), (21):
M cu calculating the longitudinal bearing moment of the guardrail at the section of the bridge deck;
M s the bending moment caused by the cantilever plate gravity at the calculated section is calculated by a program according to the guardrail and cantilever plate structure;
M b the bending moment caused by the gravity of the guardrail at the calculated section is calculated by a program according to the construction of the guardrail;
step 4, M n ＞M u Judging that the requirements of the bearing capacity of the guardrail are met;
M n <M u judging that the cantilever plate reinforcement needs to be reinforced, readjusting the diameter d of the transverse reinforcement of the cantilever plate, and solving again until M n ＞M u 。
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