CN113360969B - High-strength bolt rapid design method for steel truss girder rod piece - Google Patents
High-strength bolt rapid design method for steel truss girder rod piece Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000010276 construction Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 5
- 230000009191 jumping Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 abstract description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000003351 stiffener Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
Abstract
The invention discloses a high-strength bolt rapid design method for a steel truss girder rod piece, which comprises the following steps: setting high-strength bolt information, including high-strength bolt specification, pretension, high-strength bolt construction parameters and high-strength bolt calculation parameters; calculating the maximum number of bolts in a single row of each plate according to the section type of the rod piecen 0 Single row maximum bolt number considering manhole/hand holen 1 The method comprises the steps of carrying out a first treatment on the surface of the Based on the equal strength design method, the minimum bolt number required by each plate is calculatedn]The method comprises the steps of carrying out a first treatment on the surface of the According to the actual situation, pressn 0 Or (b)n 1 The bolts are arranged from the edge joint one by one until the total number of boltsnNot less than the minimum number of bolts [n]The method comprises the steps of carrying out a first treatment on the surface of the If the jump hole is not considered, the design result of the high-strength bolt is output, otherwise, the number of the bolts exceeding the minimum number is calculatedn]And (3) outputting a high-strength bolt design result after the correction of the bolts. The invention can be used for designing the high-strength bolt of the steel truss girder rod piece, can adapt to various complex conditions, has high design efficiency, and can be used for drawing a high-strength bolt connection diagram of the steel truss girder rod piece and calculating the net section characteristic as well as the calculation result.
Description
Technical Field
The invention belongs to the field of bridge engineering design, and particularly relates to a high-strength bolt rapid design method for a steel truss girder rod piece.
Background
Due to poor guarantee of field welding quality, high requirement on installation accuracy, short construction period and the like, the steel truss girder segments are usually mainly connected by high-strength bolts during installation.
The following difficulties exist in the design of the high-strength bolts of the steel truss girder rod pieces: firstly, the calculation condition is complex, and the section form, the stiffening rib position and the manhole/hand hole position of the steel truss girder rod piece all influence the design result of the high-strength bolt; secondly, the calculation efficiency is low, and the degree of automation is low due to the large calculation volume and the large control factors.
Therefore, an automatic design method of high-strength bolts with strong versatility and high design efficiency is needed to solve the practical problems in the design.
Disclosure of Invention
The invention provides a method for rapidly designing a high-strength bolt for a steel truss girder rod piece, which aims to solve the problems existing in the prior art.
The technical scheme of the invention is as follows: a high-strength bolt rapid design method for a steel truss girder rod piece comprises the following steps:
A. presetting high-strength bolt information
The high-strength bolt information comprises high-strength bolt specification, pretension, high-strength bolt construction parameters and high-strength bolt calculation parameters;
B. calculating the maximum number of bolts in a single row of each plate
Calculating the maximum number n of bolts in a single row of each plate according to the section type of the rod piece 0 Single row maximum number of bolts n taking manhole/hand hole into account 1 ；
C. Calculating the minimum number of bolts required for each plate
Calculating the minimum bolt number [ n ] required by each plate based on an equal strength design method;
D. high-strength bolts are arranged
According to practical conditions, according to n 0 Or n 1 The bolts are arranged one by one from the joint until the total number of bolts n is not less than the minimum number of bolts n]；
E. Outputting the design result of the high-strength bolt
If the jump hole is not considered, directly outputting the design result of the high-strength bolt; if the jump hole is considered, the bolts exceeding the minimum number of bolts [ n ] are corrected, and then a high-strength bolt design result is output.
Further, the high strength bolt construction parameters in the step A include bolt aperture, bolt center distance, bolt center to plate edge distance, bolt center to plate stiffener/H-shaped (I-shaped, king-shaped) section web distance, whether the bolts are arranged according to jump holes, and whether the bolts are arranged within the extending range of manhole/hand hole width.
Further, the manhole/hand hole is round or round end formed by rectangle and two semi-circles.
Furthermore, when the row where the current bolt is located does not have a manhole/hand hole, the bolts are also arranged according to the manhole/hand hole of the row where the current bolt is located; otherwise, the bolts are arranged according to the actual hole opening condition of the row plate where the current bolts are.
Further, the high strength bolt calculation parameter in the step a refers to a parameter for calculating the allowable anti-slip bearing capacity of the high strength bolt.
Further, the section type of the rod in the step B comprises any single-box single-chamber section and H-shaped (I-shaped and king-shaped) section.
Further, the strong design method in the step C means a design method in which the design bearing capacity of the joint is not lower than that of the base material member.
Further, in step D, the method is as follows 0 Or n 1 The bolts are arranged one by one from the edge joint, namely when the current bolt row exists in a manhole/hand hole or whether the bolts are arranged in the extending range of the width of the manhole/hand hole or not is false, the number of bolts is n 1 The bolts are arranged from the edge joint one by one; when the front bolt row does not have a manhole/hand hole, the weight of the bolt row is n 0 The bolts are arranged one by one from the edge joint.
Further, in step E, the correction of the bolts exceeding the minimum number of bolts [ n ] means reducing the total number of bolts to a minimum even number greater than the minimum number of bolts [ n ].
Furthermore, the design result of the high-strength bolts in the step E comprises the minimum number of bolts [ n ] of each plate of the steel truss girder rod piece, the total number of bolts adopted by each plate, the arrangement scheme of bolts of each plate and the number of bolts adopted by each row.
The invention rapidly designs the high-strength bolt of the steel truss girder rod piece, covers the common section type of the steel truss girder rod piece, is suitable for the conditions with stiffening ribs and manholes/hand holes, supports various arrangement methods such as jump hole arrangement and the like, and basically covers most of calculation working conditions in the design of the high-strength bolt of the steel truss girder rod piece, and has strong universality.
The invention realizes the automatic design of the high-strength bolt, can greatly improve the design efficiency, and the traditional means generally needs 3-4 h for completing the design of the high-strength bolt of a large-span steel truss girder bridge, while the invention only needs 3-5 min for completing the design of the same volume, thereby freeing the design productivity.
The design result output by the invention not only can realize the rapid design of the high-strength bolts of the steel truss girder rod pieces, but also can finish the rapid calculation of the net section characteristics and the drawing of the high-strength bolt connection diagram of the steel truss girder rod pieces by means of the design result.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a cross section of a steel truss girder upper chord and manhole thereof in an embodiment of the present invention;
FIG. 3 is a bolt layout of a y1 plate drawn according to the calculation result in the embodiment of the present invention;
FIG. 4 is a bolt layout of a y2 plate drawn according to the calculation result in the embodiment of the present invention;
FIG. 5 is a bolt layout of a z1 plate plotted against the calculation results in an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the drawings and examples:
as shown in fig. 1 to 5, a method for rapidly designing a high-strength bolt for a steel truss girder rod member includes the following steps:
A. presetting high-strength bolt information
The high-strength bolt information comprises high-strength bolt specification, pretension, high-strength bolt construction parameters and high-strength bolt calculation parameters;
B. calculating the maximum number of bolts in a single row of each plate
Calculating the maximum number n of bolts in a single row of each plate according to the section type of the rod piece 0 Single row maximum number of bolts n taking manhole/hand hole into account 1 ；
C. Calculating the minimum number of bolts required for each plate
Calculating the minimum bolt number [ n ] required by each plate based on an equal strength design method;
D. high-strength bolts are arranged
According to practical conditions, according to n 0 Or n 1 The bolts are arranged one by one from the joint until the total number of bolts n is not less than the minimum number of bolts n]；
E. Outputting the design result of the high-strength bolt
If the jump hole is not considered, directly outputting the design result of the high-strength bolt; if the jump hole is considered, the bolts exceeding the minimum number of bolts [ n ] are corrected, and then a high-strength bolt design result is output.
The high-strength bolt construction parameters in the step A comprise bolt aperture, bolt center distance, bolt center to plate edge distance, bolt center to plate stiffening rib/H-shaped (I-shaped, king-shaped) section web distance, whether bolts are arranged according to jump holes or not, and whether the bolts are arranged in the extending range of manhole/hand hole width or not.
The manhole/hand hole is round or round end formed by rectangle and two semi-circles.
When the row where the current bolt is located does not have a manhole/hand hole, arranging bolts according to the manhole/hand hole of the row where the current bolt is located; otherwise, the bolts are arranged according to the actual hole opening condition of the row plate where the current bolts are.
The high-strength bolt calculation parameters in the step A refer to parameters for calculating the allowable anti-slip bearing capacity of the high-strength bolt.
The section type of the rod in the step B comprises any single-box single-chamber section and H-shaped (I-shaped and king-shaped) section.
The medium strong design method in the step C means a design method that the design bearing capacity of the joint is not lower than that of the base material member.
In step D, according to n 0 Or n 1 The bolts are arranged one by one from the edge joint, namely when the current bolt row exists in a manhole/hand hole or whether the bolts are arranged in the extending range of the width of the manhole/hand hole or not is false, the number of bolts is n 1 The bolts are arranged from the edge joint one by one; when the front bolt row does not have a manhole/hand hole, the weight of the bolt row is n 0 The bolts are arranged one by one from the edge joint.
In step E, correcting the bolts exceeding the minimum number of bolts [ n ] means reducing the total number of bolts to a minimum even number greater than the minimum number of bolts [ n ].
The high-strength bolt design result in the step E comprises the minimum bolt number [ n ] of each plate of the steel truss girder rod piece, the total number of bolts adopted by each plate, the bolt arrangement scheme of each plate and the number of bolts adopted by each row.
For the convenience of description of the invention, common calculation parameters are represented by symbols, and the following are specific: the inner side clear width of the stiffening rib plate of the single-box single-chamber section/the width of the H-shaped (I-shaped and king-shaped) section wing plate is b, the clear width set of the stiffening rib plate of the single-box single-chamber section is { b }, the height of the web plate of the H-shaped (I-shaped and king-shaped) section is H, the clear width set of the stiffening rib plate of the web plate of the H-shaped (I-shaped and king-shaped) section is { H }, the width (diameter) of the manhole/hand hole is w, the length of the manhole/hand hole is l, and the length of the splice joint is a.
The single-box single-chamber section has stiffening rib plate clear width set { b } and is marked as b in turn according to the position relation on the plate 1 ,b 2 ……b x 。
H-shaped (I-shaped, king-shaped) cross sectionThe web plate is provided with a stiffening rib plate net width set { h } which is provided with y elements in total, and is sequentially marked as h according to the position relation on the plate 1 ,h 2 ……h y 。
Step A, presetting high-strength bolt information, which specifically comprises the following contents:
A1. and setting the specification and the pretension N of the high-strength bolt.
A2. Setting high-strength bolt construction parameters including bolt aperture d 0 Center distance d of bolts 1 Bolt center to plate edge distance d 2 Distance d between bolt center and plate stiffening rib/H-shaped (I-shaped, king-shaped) cross section web 3 。
A3. Setting high-strength bolt calculation parameters including the number m of anti-slip surfaces at the joint of the high-strength bolt and the anti-slip coefficient mu of the steel surface of the high-strength bolt 0 The safety coefficient K is increased by a coefficient eta, whether the bolts are arranged according to jump holes or not and whether the bolts are arranged within the extension range of the width of the manhole/hand hole or not.
And B, calculating the maximum number of bolts of a single row of each plate, wherein the method specifically comprises the following steps:
B1. and B2, judging whether the section type is a single-box single-chamber section or an H-shaped (I-shaped and king-shaped) section, executing the step B2 by the single-box single-chamber section, and executing the step B3 by the H-shaped (I-shaped and king-shaped) section.
B2. B2-1 is executed if the plate has no stiffening rib and a manhole and whether bolts are arranged in the extending range of the width of the manhole/hand hole is true; if the plate has no stiffening rib, has a manhole, and whether the bolt is arranged in the extending range of the width of the manhole/hand hole is false, executing the step B2-2; if the plate has no stiffening ribs and no holes, executing the step B2-3; if the plate has stiffening ribs, has manholes, and whether the bolts are arranged in the extending range of the width of the manholes or the hand holes is true, executing the step B2-4; if the plate has stiffening ribs, has manholes, and whether the bolts are arranged in the extending range of the width of the manholes or the hand holes is false, executing the step B2-5; and B2-6, if the plate is provided with stiffening ribs and has no manhole.
B2-1. Maximum number of bolts per row n 0 The calculation formula is as follows:
taking the center of a manhole/hand hole semicircle as a (0, 0) point, taking the longitudinal direction of a rod piece as an x axis, taking the transverse direction of the rod piece as a y axis, and recording the y coordinates of each bolt to a set { y };
consider the maximum number of bolts n of a single row of manhole/hand hole 1 The calculation formula is as follows:
b2-2. Maximum number of bolts per row n 0 The calculation formula is as follows:
consider the maximum number of bolts n of a single row of manhole/hand hole 1 The calculation formula is as follows:
b2-3 maximum number of bolts in single row n 0 The calculation formula is as follows:
b2-4 maximum number of bolts in single row n 0 The calculation formula is as follows:
taking the center of a manhole/hand hole semicircle as a (0, 0) point, taking the longitudinal direction of a rod piece as an x axis, taking the transverse direction of the rod piece as a y axis, and recording the y coordinates of each bolt to a set { y };
consider the maximum number of bolts n of a single row of manhole/hand hole 1 The calculation formula is as follows:
b2-5 maximum number of bolts in single row n 0 The calculation formula is as follows:
consider the maximum number of bolts n of a single row of manhole/hand hole 1 The calculation formula is as follows:
b2-6 maximum number of bolts in single row n 0 The calculation formula is as follows:
B3. b3-1, judging the structural form of each plate with the H-shaped (I-shaped and king-shaped) cross section, and if the plates are wing plates with the H-shaped (I-shaped and king-shaped) cross sections; if the plate is an H-shaped (I-shaped or king-shaped) cross-section web plate and has no stiffening rib, executing the step B3-2; if the plate is an H-shaped (I-shaped or king-shaped) cross-section web plate and is provided with stiffening ribs, executing the step B3-3;
b3-1. Maximum number of bolts per row n 0 The calculation formula is as follows:
b3-2 maximum number of bolts in single row n 0 The calculation formula is as follows:
b3-3 maximum number of bolts in single row n 0 The calculation formula is as follows:
and C, calculating the minimum number of bolts required by each plate, wherein the minimum number of bolts comprises the following contents:
calculating the minimum bolt number [ n ] required by each plate based on an equal strength design method;
C1. the anti-slip bearing capacity P of the single bolt is calculated, and the calculation formula is as follows:
P＝mμ 0 N/K (14)
C2. the minimum number of bolts [ n ] required for each plate is calculated as follows:
[n]＝ηA 0 [σ]/P (15)
note that: a in formula (15) 0 The net area of the base material member is n for the tie rod 0 Or n 1 The area after the buckling holes is the area after the compression allowable stress reduction coefficient is considered for the compression bar; [ Sigma ]]The strength of the base material is designed.
Step D, arranging high-strength bolts, which comprises the following steps:
D1. judging whether a manhole/hand hole exists in the plate, and if the judgment result is true, executing the step D2; if the judgment result is false, executing the step D3.
D2. D2-1 is executed by taking the seam as a starting point, judging the position relation between the row where the current bolt is located and the manhole/hand hole, and if the row where the current bolt is located is within the straight edge (if any) of the manhole/hand hole; d2-2 is executed if the current bolt is arranged in the range of the manhole/hand hole semicircle; and D2-3, if the current bolt is arranged outside the range of the manhole/hand hole.
D2-1, n is the total number of each row 1 Arranging a new row of bolts, and arranging n 1 Adding to the set { n }, judging whether the current total bolt number n is smaller than the minimum bolt number [ n ]]If the judgment result is true, repeating the step D2-1 until the total number of bolts n is not less than the minimum number of bolts [ n ]](at this time, the total number n of bolts and the set { n } are output) or the row where the current bolt is located exceeds the straight edge range of the manhole/hand hole; if the judgment result is false, stopping arrangement, and outputting the total bolt number n and the set { n }.
D2-2, judging whether the bolts are arranged in the extending range of the width of the manhole/hand hole, and if the judging result is true, executing the step D2-2-1; if the judgment result is false, executing the step D2-2-2.
D2-2-1. An integer j=0 is defined.
Taking the center of a manhole/hand hole semicircle as a (0, 0) point, taking the longitudinal direction of a rod piece as an x axis and the transverse direction of the rod piece as a y axis, calculating the x coordinate of the row where the current bolt is positioned, and combining the x coordinate with a bolt y coordinate set { y } to form a point set { P (x, y) }.
Traversing the set of points { P (x, y) }, when point P i The distance to the center of the manhole/hand hole semicircle is not less than (w/2+d) 2 ) When j=j+1.
After traversing, arranging a new row of bolts according to the total number j of each row, adding j to the set { n }, judging whether the current total number n of bolts is smaller than the minimum number n of bolts, if the judgment result is true, repeating the step D2-2-1 until the total number n of bolts is not smaller than the minimum number n of bolts (at this time, the total number n of bolts and the set { n }) or the row where the current bolts are located exceeds the manhole/hand hole semicircle range; if the judgment result is false, stopping arrangement, and outputting the total bolt number n and the set { n }.
D2-2-2. N is the total number of each row 1 Arranging a new row of bolts, and arranging n 1 Adding to the set { n }, judging whether the current total bolt number n is smaller than the minimum bolt number [ n ]]If the judgment result is true, repeating the step D2-2-2 until the total number of bolts n is not less than the minimum number of bolts [ n ]](at this time, the total number n of bolts and the set { n } are output) or the row where the current bolts are located exceeds the range of manhole/hand hole semicircle; if the judgment result is false, stopping arrangement, and outputting the total bolt number n and the set { n }.
D2-3, judging whether the bolts are arranged in the extending range of the width of the manhole/hand hole, and if the judging result is true, executing the step D2-3-1; and if the judgment result is false, executing the step D2-3-2.
D2-3-1. N is the total number of each row 0 Arranging bolts, n 0 Adding to the set { n }, judging whether the current total bolt number n is smaller than the minimum bolt number [ n ]]If the judgment result is true, repeating the step D2-3-1 until the total number of bolts n is not less than the minimum number of bolts [ n ]]Outputting the total bolt number n and the set { n }; such asIf the judgment result is false, stopping arrangement, and outputting the total bolt number n and the set { n }.
D2-3-2, n is the total number of each row 1 Arranging bolts, n 1 Adding to the set { n }, judging whether the current total bolt number n is smaller than the minimum bolt number [ n ]]If the judgment result is true, repeating the step D2-3-2 until the total number of bolts n is not less than the minimum number of bolts [ n ]]Outputting the total bolt number n and the set { n }; if the judgment result is false, stopping arrangement, and outputting the total bolt number n and the set { n };
D3. starting from the edge joint, according to the total number n of each row 0 Arranging a new row of bolts, and arranging n 0 Adding to the set { n }, judging whether the current total bolt number n is smaller than the minimum bolt number [ n ]]If the judgment result is true, repeating the step D3 until the total bolt number n is not less than the minimum bolt number [ n ]]Outputting the total bolt number n and the set { n }; if the judgment result is false, stopping arrangement, and outputting the total bolt number n and the set { n }.
And E, if the jump hole is not considered, outputting a high-strength bolt design result, otherwise, correcting the bolts exceeding the minimum bolt number [ n ], and outputting the high-strength bolt design result.
E1. E2, judging whether the bolts are arranged according to the jump holes, and if the judgment result is true, executing the step E2; if the judgment result is false, executing the step E3;
E2. number n of bolt jump holes j Is calculated as
If n j Is odd, n j ＝n j -1 (17)
The total number of elements in the set { N } is recorded as t, a new set { N } is established, let N 1 ＝n t ，N 2 ＝n 1 ，N 3 ＝n t-1 ，N 4 ＝n 2 ……；
Traversing the set { N }, let k=n i 2, if k is odd, let k=k-1; if k is greater than or equal to n j Let N i ＝N i -n j 、n＝n-n j Update set { n }Stopping traversing the corresponding elements; if k is less than n j Let N i ＝N i -k、n＝n-k，n j ＝n j -k, updating the corresponding elements in the set { n }, continuing the traversal;
after traversing, outputting the minimum number of bolts [ n ] and the total number of bolts n; and traversing each element of the set { n }, and outputting the elements in a format of 'element 1+ element 2+ … …' as a high-strength bolt arrangement scheme.
E3. Outputting the minimum number of bolts [ n ], and the total number of bolts n; and traversing each element of the set { n }, and outputting the elements in a format of 'element 1+ element 2+ … …' as a high-strength bolt arrangement scheme.
Example 1
Taking the section of a steel truss girder upper chord rod and a manhole as an example, the section of the steel truss girder upper chord rod consists of two steel plates with the width of 1420mm and the thickness of 28mm and two steel plates with the width of 1300mm and the thickness of 24mm, and each steel plate is welded with stiffening ribs with the height of 240mm and the thickness of 24 mm. The manhole is arranged on the y1 plate, and the width of the manhole is 300mm and the length of the manhole is 520mm.
The invention will be further described with reference to the example of an upper chord shown in fig. 2.
Firstly, setting high-strength bolt information, namely, in the step A, for the example, adopting M30 and the bolt aperture d as the high-strength bolt specification 0 33mm, center distance d of bolts 1 100mm from the center of the bolt to the edge of the plate 2 50mm distance d from the center of the bolt to the web of the H-shaped (I-shaped or king-shaped) section of the plate stiffening rib 3 100mm.
Then, setting high-strength bolt calculation parameters, wherein the number m of anti-slip surfaces at the joint of the high-strength bolt is 2, and the anti-slip coefficient mu of the steel surface of the high-strength bolt 0 The safety factor K is 1.7, and the bolt number improvement factor eta is 1.1.
For this example, the calculation conditions are: the section form is a single-box single-chamber section; the y1 plate, the y2 plate, the z1 plate and the z2 plate are all provided with stiffening ribs; the y1 plate is provided with a manhole; the bolt arrangement considers the jump hole arrangement; the bolts are arranged within the extension of the manhole/hand hole width.
B, calculating the maximum number n of bolts in a single row of each plate according to the step B 0 Single row maximum number of bolts n taking manhole/hand hole into account 1 。
And C, calculating the minimum bolt number [ n ] required by each plate based on the equal strength design method.
According to the actual situation, according to step D, according to n 0 Or n 1 The bolts are arranged one by one from the joint until the total number of bolts n is not less than the minimum number of bolts n]。
According to the step E, the example considers the jump hole and corrects the bolts exceeding the minimum bolt number [ n ].
Fig. 3 to 5 are bolt arrangement diagrams of the y1 plate, the y2 plate, and the z1 plate (z 2 plate) respectively drawn according to the calculation results.
The invention rapidly designs the high-strength bolt of the steel truss girder rod piece, covers the common section type of the steel truss girder rod piece, is suitable for the conditions with stiffening ribs and manholes/hand holes, supports various arrangement methods such as jump hole arrangement and the like, and basically covers most of calculation working conditions in the design of the high-strength bolt of the steel truss girder rod piece, and has strong universality.
The invention realizes the automatic design of the high-strength bolt, can greatly improve the design efficiency, and the traditional means generally needs 3-4 h for completing the design of the high-strength bolt of a large-span steel truss girder bridge, while the invention only needs 3-5 min for completing the design of the same volume, thereby freeing the design productivity.
The design result output by the invention not only can realize the rapid design of the high-strength bolts of the steel truss girder rod pieces, but also can finish the rapid calculation of the net section characteristics and the drawing of the high-strength bolt connection diagram of the steel truss girder rod pieces by means of the design result.
Claims (10)
1. A rapid design method for a high-strength bolt of a steel truss girder rod piece is characterized by comprising the following steps: the method comprises the following steps:
(A) Presetting high-strength bolt information
The high-strength bolt information comprises the following three items: high-strength bolt specification, pretension, high-strength bolt construction parameters and high-strength bolt calculation parameters;
(B) Calculating the maximum number of bolts in a single row of each plate
Calculating the maximum number n of bolts in a single row of each plate according to the section type of the rod piece 0 Single row maximum number of bolts n taking manhole/hand hole into account 1 ；
(C) Calculating the minimum number of bolts required for each plate
Calculating the minimum bolt number [ n ] required by each plate based on an equal strength design method;
(D) High-strength bolts are arranged
According to practical conditions, according to n 0 Or n 1 The bolts are arranged one by one from the joint until the total number of bolts n is not less than the minimum number of bolts n]；
(E) Outputting the design result of the high-strength bolt
If the jump hole is not considered, directly outputting the design result of the high-strength bolt; if the jump hole is considered, the bolts exceeding the minimum number of bolts [ n ] are corrected, and then a high-strength bolt design result is output.
2. The method for rapidly designing the high-strength bolt for the steel truss girder rod piece according to claim 1, wherein the method comprises the following steps: the construction parameters of the high-strength bolt in the step (A) comprise the following six items: bolt aperture, bolt center distance, bolt center to board edge distance, bolt center to board stiffening rib/cross section web distance, whether the bolt is arranged according to jumping hole, whether the bolt is arranged in the range of manhole/hand hole width extension, the cross section web includes following web: h-shaped cross section web, I-shaped cross section web and king-shaped cross section web.
3. The rapid design method for the high-strength bolts of the steel truss girder rod piece according to claim 2, wherein the rapid design method comprises the following steps: the manhole/hand hole is round or round end formed by rectangle and two semi-circles.
4. The rapid design method for the high-strength bolts of the steel truss girder rod piece according to claim 2, wherein the rapid design method comprises the following steps: when the row where the current bolt is located does not have a manhole/hand hole, arranging bolts according to the manhole/hand hole of the row where the current bolt is located; otherwise, the bolts are arranged according to the actual hole opening condition of the row plate where the current bolts are.
5. The method for rapidly designing the high-strength bolt for the steel truss girder rod piece according to claim 1, wherein the method comprises the following steps: the high-strength bolt calculation parameter in the step (A) refers to a parameter for calculating the allowable anti-skid bearing capacity of the high-strength bolt.
6. The method for rapidly designing the high-strength bolt for the steel truss girder rod piece according to claim 1, wherein the method comprises the following steps: the type of cross section of the rod in step (B) includes the following cross sections: any single-box single-chamber section, H-shaped section, I-shaped section and king-shaped section.
7. The method for rapidly designing the high-strength bolt for the steel truss girder rod piece according to claim 1, wherein the method comprises the following steps: the medium strong design method in the step (C) means a design method in which the design bearing capacity of the joint is not lower than that of the base material member.
8. The method for rapidly designing the high-strength bolt for the steel truss girder rod piece according to claim 1, wherein the method comprises the following steps: according to n in the step (D) 0 Or n 1 The bolts are arranged one by one from the edge joint, namely, when the front bolt row exists in a manhole/hand hole or the bolts are not arranged in the extending range of the width of the manhole/hand hole, the bolts are arranged according to n 1 The bolts are arranged from the edge joint one by one; when the front bolt row does not have a manhole/hand hole, the weight of the bolt row is n 0 From piece to piece and arrangeAnd (5) a bolt.
9. The method for rapidly designing the high-strength bolt for the steel truss girder rod piece according to claim 1, wherein the method comprises the following steps: the correction of the bolts exceeding the minimum number of bolts [ n ] in step (E) means reducing the total number of bolts to a minimum even number greater than the minimum number of bolts [ n ].
10. The method for rapidly designing the high-strength bolt for the steel truss girder rod piece according to claim 1, wherein the method comprises the following steps: the high-strength bolt design result in the step (E) comprises the following four items: the minimum number of bolts [ n ] of each plate of the steel truss girder rod piece, the total number of bolts adopted by each plate, the arrangement scheme of bolts of each plate and the number of bolts adopted by each row.
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