CN111339613A - Arc apex angle double-limb thick angle steel and design method thereof - Google Patents
Arc apex angle double-limb thick angle steel and design method thereof Download PDFInfo
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Abstract
The invention provides a circular arc apex angle double-limb thick angle steel and a design method thereof, wherein the circular arc apex angle double-limb thick angle steel comprises a first limb and a second limb which are intersected to form a preset included angle; the first limb and the second limb comprise at least one boss part protruding out of the inner surface or the outer surface of the first limb and the second limb, the moment of inertia of the angle steel is not less than the moment of inertia of the angle steel corresponding to the standard specification of the angle steel, the section area of the angle steel is less than the section of the angle steel corresponding to the standard specification of the angle steel, the intersection of the first limb and the second limb at the outer surface of the angle steel is in a circular arc shape, and the thickness of the angle steel at the intersection of the circular arcs is greater than or equal to the thickness of the first limb and the second limb.
Description
Technical Field
The invention relates to the technical field of angle steel, in particular to a circular arc top angle double-limb thick angle steel and a design method thereof.
Background
The angle steel is a common building material, the cross section of the angle steel is mainly in a right-angle shape, the shape is a long steel bar with two perpendicular sides in a right-angle shape, the angle steel is mainly applied to the aspects of metal members, the framework of a factory building, the construction of a power transmission line iron tower or a communication iron tower and the like, and the angle steel is required to have better weldability, plastic deformation performance and certain mechanical strength in use.
The angle steel is divided into equal-edge angle steel and unequal-edge angle steel, the cross section of the equal-edge angle steel is basically right-angled, and the equal-edge angle steel means that two limb sides are mutually perpendicular to form a right-angled long material with equal thickness. The equilateral angle steel is mainly used for the structures of metal members, bridges, plants and storehouses, power transmission towers or communication towers and the like. The equilateral angle steels are further divided into hot-rolled equilateral angle steels and cold-bent equilateral angle steels according to the production process. Considering production cost, processing efficiency and quality factors, hot-rolled equilateral angle steel is widely applied to transmission towers, and cold-bent angle steel is rarely applied.
The hot-rolled equilateral angle steel is mainly used for the iron tower of the power transmission line. In recent years, the construction of power grids in China has been developed greatly, particularly the construction level and the development speed of ultra-high voltage transmission lines are in the forefront of the world, and especially the application of hot-rolled equilateral angle steel is the most extensive, and the annual usage amount is about 300 ten thousand tons. The power transmission iron tower is mainly designed according to the strength grade, the quality grade, the section area, the section inertia moment and the like of hot-rolled equal-side angle steel. The steel structure design should rationally select material, structural scheme and constructional measure, satisfy the intensity of structural component in transportation, installation and use, stability and rigidity requirement. The iron tower is a space truss structure, namely all components are regarded as two-force rod units, the nodes are simplified into hinged joints, and the components only consider the axial tension and compression acting force. When designing the steel structure of the iron tower, the tensile and compressive strength and the compressive stability of the component need to be analyzed. The angle steel structure that adopts at present is the angle steel of limb thickness such as, and how to promote the performance of angle steel through the cross-section that changes the angle steel has important meaning to the deep application and the development of this kind of traditional shaped steel of angle steel.
In addition, the outer vertex angle of the conventional angle steel is a right angle. When stacking, the top ends of the upper and lower angle steels are in line contact, so that the stability is poor, and the storage and transportation are influenced; when the component is processed, the top end of the angle steel needs to be subjected to back shoveling and back chipping treatment, so that the working procedure and the cost are increased; during hot galvanizing, the vertex angle is easy to have the defects of burrs, zinc nodules, thicker zinc layer and the like, and the adhesiveness of galvanizing is poor; the zinc layer is easy to collide, abrade and fall off at the top corner in the loading, unloading and transporting processes, and the zinc coating is damaged.
Therefore, how to improve the performance by optimizing the structural shape on the basis of the existing angle steel is an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a double-limb thick angle steel with a circular arc top angle, which reduces the sectional area of the angle steel by changing the shape of the cross section under the condition of ensuring the inertia moment of the section of the equal-edge angle steel, reduces the weight of the angle steel, is beneficial to the production, transportation and processing of the angle steel and improves the hot galvanizing quality of the angle steel.
The invention also aims to provide a design method of the arc-shaped top angle double-limb thick angle steel.
In order to achieve the aim, the invention discloses a circular arc apex angle double-limb thick angle steel on one hand, which comprises a first limb and a second limb which are intersected to form a preset included angle;
the intersection of the first limb and the second limb on the outer surface of the angle steel is arc-shaped, and the thickness of the angle steel at the intersection of the arc shapes is more than or equal to the thickness of the first limb and the second limb;
the first limb and the second limb comprise at least one boss part protruding out of the inner surface or the outer surface of the first limb and the second limb, the moment of inertia of the angle steel is not less than that of the angle steel corresponding to the angle steel standard specification, and the cross-sectional area of the angle steel is less than that of the angle steel corresponding to the angle steel standard specification.
Preferably, the radius of the circular arc is 1-5 mm.
Preferably, the angle steel is a symmetrical structure taking the center line of the preset included angle as a symmetry axis, and the preset included angle is a right angle.
Preferably, the outer side edge of the boss portion is flush with an end edge of the first and second limbs remote from the intersection of the first and second limbs.
Preferably, the arc top angle double-limb thick angle steel is formed by hot rolling.
Preferably, the thickness (t) of said first or said second limb1) The difference from the standard limb thickness is less than 10% of the standard limb thickness.
Preferably, the thickness (t) of the boss portion2-t1) 10% of the standard limb thickness.
Preferably, in a section of angle steel, a width of the boss portion in a direction in which the first limb or the second limb extends is greater than 15% of a length of the first limb or the second limb.
The invention also discloses a design method of the angle steel, which comprises the following steps:
determining standard specification parameters of the angle steel;
determining the arc radius of the arc-shaped top angle of the outer surface of the angle steel;
determining initial limb thickness (t)1) Thickness (t) of boss portion2-t1) And an initial width ratio;
determining the ratio of the moment of inertia and the cross-sectional area formed by the angle steels with different arc radiuses to obtain the inertia product ratio corresponding to the different arc radiuses;
fitting all the inertia product ratios according to the arc radius to obtain an inertia product ratio curve, and obtaining the optimal arc radius corresponding to the highest inertia product ratio;
fixing the arc radius of the angle steel to be the optimal arc radius, adjusting the limb thickness and the width of the boss part, and determining that the inertia moment of the angle steel is not less than the inertia moment of the angle steel corresponding to the standard specification of the angle steel and the sectional area of the angle steel is less than the optimal limb thickness and the width of the boss part of the section of the angle steel corresponding to the standard specification of the angle steel;
and obtaining the overall optimal design parameters of the double-limb thick angle steel according to the optimal arc radius, the optimal limb thickness and the width of the boss part, and designing the double-limb thick angle steel according to the optimal design parameters.
The first limb and the second limb of the arc apex angle double-limb thick angle steel comprise at least one boss part protruding out of the inner surface or the outer surface of the first limb and the second limb. By changing the section shape of the traditional angle steel, each limb of the arc-shaped top angle double-limb thick angle steel has at least two limb thicknesses with different thicknesses, and the sectional area of the angle steel is reduced by changing the shape of the cross section under the condition of ensuring the inertia moment, so that the overall weight of the angle steel is reduced, the consumption of steel materials is reduced, the weight of an iron tower formed by the angle steel is reduced, the purpose of optimizing the performance of the angle steel can be achieved, and the competitiveness and the stress value of an angle steel product are improved. The top angle of the dome arc top angle double-limb thick angle steel is an arc, so that the production, transportation and processing of the angle steel are facilitated, and the hot galvanizing quality is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a cross-sectional view of a conventional angle iron;
FIG. 2 is a cross-sectional view of a double-limb thick angle steel with a circular arc top angle, which is disclosed by the invention;
FIG. 3 shows an enlarged view of area A in FIG. 2;
FIG. 4 is a flowchart illustrating a method for designing a thick angle steel with a circular arc apex angle according to an embodiment of the present invention;
FIG. 5 illustrates a schematic diagram of a computer device suitable for use in implementing embodiments of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The existing angle steel standard specifies angle steel with equal limb thickness, for example, the angle steel shown in fig. 1, the angle steel standard specifies the section parameters and the length of each type of angle steel, and the existing common angle steel standard includes: the national standard of the hot-rolled equal-angle steel is GB/T706 plus 2016 hot-rolled section steel, and the execution standard of the hot-rolled equal-angle steel for the power transmission tower is YB/T4163 plus 2016 and the like.
According to one aspect of the invention, the embodiment discloses a circular arc top angle double-limb thick angle steel. As shown in figure 2, the arc apex double-limb thick angle steel comprises a first limb 1 and a second limb 2 which are intersected to form a preset included angle.
The first limb 1 and the second limb 2 comprise at least one boss part 3 protruding out of the inner surface or the outer surface of the first limb 1 and the second limb 2, the moment of inertia of the angle steel is not less than that of the angle steel corresponding to the standard specification of the angle steel, and the cross-sectional area of the angle steel is less than that of the angle steel corresponding to the standard specification of the angle steel.
The first limb 1 and the second limb 2 of the arc apex double-limb thick angle steel comprise at least one boss part 3 protruding the inner surface or the outer surface of the first limb 1 and the second limb 2. By changing the section shape of the traditional angle steel with equal limb thickness, each limb of the arc-shaped apex angle double-limb thick angle steel has at least two limb thicknesses with different thicknesses, and the sectional area of the angle steel is reduced by changing the section shape under the condition of ensuring the inertia moment, so that the overall weight of the angle steel is reduced, the consumption of steel data is reduced, the weight of an iron tower formed by the angle steel is reduced, the purpose of optimizing the performance of the angle steel can be achieved, and the competitiveness and the stress value of an angle steel product are improved.
The intersection of the outer surfaces of the first limb 1 and the second limb 2 is circular arc-shaped. Preferably, the arc radius R of the arc-shaped top end of the outer side is about 1-5 mm. The hot-rolled arc-shaped angle steel can obviously improve the thickness, adhesive force and uniformity of a zinc layer and reduce the aggregation of induced electricity in the hot-dip galvanizing process. When the angle steel is rolled relative to the right-angled outer side, the process of rolling the arc apex angle is more convenient than that of rolling the right-angled apex angle, the rolling defects of the top angle of the angle steel, such as cracks, scabs, meat deficiency, surface interlayers and the like, are reduced, a back shoveling process and a back chipping process are not needed, the processing procedures are reduced, and the working efficiency is improved. The convex angle steel of hot rolling is beating bundle packaging process, because the angle steel height reduces to some extent, and the upper and lower layer angle steel interlock is more inseparable, avoids destroying the galvanizing coat, does benefit to packing and transportation, and when the angle steel was put things in good order, the circular arc apex angle was compared in right angle apex angle area of contact great, and it is stable to put things in good order, provides very big facility to the storage of angle steel and transportation. The quality of the preset angle formed by the angle steel is greatly improved. Hot rolling right angle apex angle steel is when the angle that opens and shuts, owing to receive the restriction of limb muscle, and the position of being close to the apex angle is difficult to open and shut, leads to forming to predetermine angle back angle steel limb limit and appears the arc, if the operation is improper or predetermine the great crack that also can produce of angle number, and circular arc apex angle steel does not have limb muscle influence, consequently can make things convenient for effectual realization more when the angle that opens and shuts.
In a preferred embodiment, the angle steel has a symmetrical structure with a center line of the preset included angle as a symmetry axis. In the section of the angle steel, the length and thickness parameters of the first limb 1 and the second limb 2 are the same, namely the angle steel is equilateral angle steel. In other embodiments, the first limb 1 and the second limb 2 may also be of different lengths, i.e. unequal angle steel.
In a preferred embodiment, the preset included angle is a right angle, so that the structure is stable, and the compression resistance and the tensile resistance are good. In this preferred embodiment, the angle steel is a right angle steel, and in other embodiments, other angles may be selected according to the requirement of practical application, which is not limited in the present invention.
In a preferred embodiment, the outer side edge of the boss portion 3 is flush with the edge of the end of the first and second limbs 1, 2 remote from the intersection of the first and second limbs 1, 2. It will be appreciated that in the preferred embodiment, the boss portion 3 is located at the outer end of the corresponding limb remote from the intersection with the other limb, which facilitates the formation by hot rolling, simplifying the angle steel forming process.
In this embodiment only one boss portion 3 is provided on the inner surface of each of the first and second limbs 1, 2. In other embodiments, the boss portion 3 of the inner surface or the outer surface of the first limb 1 and/or the second limb 2 may be provided in plural, which is not limited by the present invention.
In this embodiment, the intersection of the inner surfaces of the first limb 1 and the second limb 2 is in the shape of a circular arc. The boss parts 3 of the first limb 1 and the second limb 2 can also be arranged on the outer surface of the angle steel, namely, the boss parts 3 can be arranged on the inner surface of the first limb 1 and/or the second limb 2, also can be arranged on the outer surface of the first limb 1 and/or the second limb 2, or can be arranged on the inner surface and the outer surface of the first limb 1 and/or the second limb 2 at the same time, namely, the original same-limb thick angle steel is changed into double-limb thick angle steel by forming the boss parts 3 on the angle steel, and then the section area of the angle steel can be reduced under the condition of ensuring the inertia moment of the angle steel by properly adjusting the arc radius, the double-limb thickness size and the width of the boss parts.
In a preferred embodiment, the arc apex angle double-limb thick angle steel is formed by hot rolling. For the existing angle steel, a hot rolling production process is generally adopted to form the angle steel. The hot-rolled angle steel is generally formed by adopting a continuous casting square or rectangular billet and adopting a two-roll or three-roll section mill for hot rolling. For example, the production line of 300-type, 500-type fully continuous or semi-continuous section steel is generally used for 4-14 # small and medium-sized angle steels, and the production line of 650-type, 850-type transverse or longitudinal section steel is generally used for 14# or more.
In a preferred embodiment, the thickness (t) of the first limb 1 or the second limb 21) And the thickness (t) at the boss portion 32) The difference from the thickness specified by the standardLess than 10%, more preferably, the thickness (t) of the boss portion 32-t1) Is 10% of the standard limb thickness specified by the angle steel standard. In order to reduce the influence on the hot rolling forming of the existing angle steel, the thickness difference of two different thicknesses of each limb of the angle steel is 10 percent, such as: the thickness difference of the angle steel with the limb thickness of 5mm is 0.5mm, the thickness difference of the angle steel with the limb thickness of 20mm is 2mm, the whole size of the angle steel is not changed greatly and is symmetrical, the original process hot rolling forming is still adopted, the design of a finish rolling hole pattern and the design of a straightening roll are required to be modified properly, the influence on the angle steel forming process is small, the production efficiency of the double-limb thick angle steel is ensured not to be reduced, and the cost is not obviously improved. In the standard of the angle steel, the angle steel of the same model generally has a plurality of thicknesses, the thickness of the angle steel of a certain model, which is suitable for one specification parameter or has a large production amount, can be determined as the standard limb thickness, and the thickness of the boss part of the angle steel of other thicknesses is determined according to the selected standard limb thickness.
Further, a slope 4 is formed between the surface of the boss portion 3 and the inner surface of the corresponding first or second limb 1 or 2 due to the hot rolling process, as shown in fig. 3. in the present embodiment, the limb thickness and the thickness of the boss portion 3 are set such that the angle α formed between the slope and the corresponding inner surface is less than 45 °, and more preferably, the angle α formed between the slope and the corresponding inner surface is 30 ° to 40 ° to secure the quality of the hot rolled angle steel.
In a preferred embodiment, in a section of angle steel, the width of the boss portion 3 of said first limb 1 or said second limb 2 in the direction of extension of said first limb 1 or said second limb 2 is greater than 15% of the length of said first limb 1 or said second limb 2, i.e. in the transverse direction of the angle steel, the length of the boss portion 3 is greater than 15% of the length of the first limb 1 or the second limb 2. Specifically, for the angle steels with different specifications, the optimal width can be determined by a drawing method and a regression analysis method.
In conclusion, the rigidity of the arc apex angle double-limb thick angle steel is superior to that of single-limb thick equal-side angle steel with the same specification and material, the sectional area is reduced and the dead weight is reduced under the condition of the same rigidity of the angle steel with the same specification; when the arc-shaped top angle double-limb thick angle steel is packaged by an occlusion method, the top angle of the angle steel can be prevented from contacting with the inner circle of the upper layer angle steel, and the packaging, transportation and processing are facilitated; the arc apex angle double-limb thick angle steel can effectively save steel resources, reduce the self weight of the iron tower, improve the rigidity of the angle steel, improve the hot galvanizing quality, promote the competitiveness and application value of angle steel products and lead the technical progress of the angle steel products.
Based on the same principle and on the other aspect of the invention, the invention also discloses a design method of the angle steel. As shown in fig. 4, the method includes:
s100: and determining standard specification parameters of the angle steel. For example, 20# angle steel with a thickness of 20 is selected, standard specification parameters of the angle steel available according to the angle steel standard at least comprise a standard limb thickness t and a length B of each limb, the standard limb thickness t of the angle steel with the thickness of 20# is 20mm, and the length B of each limb is 200 mm.
S200: and determining the arc radius of the arc-shaped top angle of the outer surface of the angle steel. Wherein the selection range of the radius of the circular arc is 1-5 mm.
S300: determining initial limb thickness (t)1) Thickness (t) of boss portion2-t1) And an initial width ratio. In particular, the thickness (t) of the boss portion2-t1) The initial limb thickness is 10% of the standard limb thickness t, and the appropriate ratio of the initial limb thickness to the initial width of the boss part can be selected according to practical experience.
S400: and determining the ratio of the moment of inertia and the cross-sectional area formed by the angle steels with different arc radiuses to obtain the inertia product ratio corresponding to the different arc radiuses.
S500: and fitting all the inertia product ratios according to the arc radius to obtain an inertia product ratio curve, and obtaining the optimal arc radius corresponding to the highest inertia product ratio.
S600: the arc radius of the fixed angle steel is the optimal arc radius, the limb thickness and the width of the boss part are adjusted, the fact that the inertia moment of the angle steel is not smaller than the inertia moment of the angle steel corresponding to the standard specification of the angle steel is determined, and the section area of the angle steel is smaller than the optimal limb thickness and the width of the boss part of the section of the angle steel corresponding to the standard specification of the angle steel.
S700: and obtaining the overall optimal design parameters of the double-limb thick angle steel according to the optimal arc radius, the optimal limb thickness and the width of the boss part, and designing the double-limb thick angle steel according to the optimal design parameters.
The present invention will be further described with reference to a specific example, taking 20# double-limb thick angle steel and angle steel with a thickness of 20 as an example, firstly determining the arc radius of the arc apex angle of the outer surface of the angle steel, selecting a plurality of radii within the range of 1-5 mm, then determining the thickness of the boss portion 3, the initial width ratio and the initial limb thickness according to the specification parameters of the angle steel, the width ratio being the ratio of the boss portion 3 to the whole limb width, then selecting a plurality of different arc radii, and further selecting a plurality of different angle steel sections. And calculating the inertia product ratios of the angle steels corresponding to different arc radii, further fitting an inertia product ratio curve by taking the arc radii as independent variables, determining the arc radii corresponding to the highest inertia product ratio through a curve function obtained by fitting, obtaining the optimal arc radii, and further designing to obtain the angle steels.
It will be appreciated that the difference between the thickness of the first limb 1 or the second limb 2 and the standard limb thickness as specified by the standard is less than 10% of the standard limb thickness, i.e. the ratio of the upper and lower float of the limb thickness in the boss portion 3 and other areas is within 10% of the standard limb thickness, the width of the boss portion in the direction in which the first limb or the second limb extends is greater than 15% of the length of the first limb or the second limb, the width of the boss part 3, the thickness of the boss part 3 and the limb thickness can be selected within the range, and the width, the thickness and/or the limb thickness of the boss part 3 can be further adjusted until the conditions that the moment of inertia of angle steel is not less than the moment of inertia of angle steel corresponding to the angle steel standard specification and the sectional area of the angle steel is less than the section of the angle steel corresponding to the angle steel standard specification are met, and the limb thickness and the boss part width at the moment are the optimal limb thickness and the boss part width. Alternatively, one of the parameters of the width, thickness and/or limb thickness of the boss portion 3 may be adjusted separately with a gradient until the condition is met. And obtaining the overall optimal design parameters of the double-limb thick angle steel according to the optimal arc radius, the optimal limb thickness and the width of the boss part, and designing the double-limb thick angle steel according to the optimal design parameters.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. A typical implementation device is a computer device, which may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
In a typical example, the computer device specifically comprises a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method performed by the client as described above when executing the program, or the processor implementing the method performed by the server as described above when executing the program.
Referring now to FIG. 5, shown is a schematic diagram of a computer device 600 suitable for use in implementing embodiments of the present application.
As shown in fig. 5, the computer apparatus 600 includes a Central Processing Unit (CPU)601 which can perform various appropriate works and processes according to a program stored in a Read Only Memory (ROM)602 or a program loaded from a storage section 608 into a Random Access Memory (RAM)) 603. In the RAM603, various programs and data necessary for the operation of the system 600 are also stored. The CPU601, ROM602, and RAM603 are connected to each other via a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
The following components are connected to the I/O interface 605: an input portion 606 including a keyboard, a mouse, and the like; an output section 607 including a Cathode Ray Tube (CRT), a liquid crystal feedback (LCD), and the like, and a speaker and the like; a storage section 608 including a hard disk and the like; and a communication section 609 including a network interface card such as a LAN card, a modem, or the like. The communication section 609 performs communication processing via a network such as the internet. The driver 610 is also connected to the I/O interface 605 as needed. A removable medium 611 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 610 as necessary, so that a computer program read out therefrom is mounted as necessary on the storage section 608.
In particular, according to an embodiment of the present invention, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, embodiments of the invention include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the method illustrated in the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication section 609, and/or installed from the removable medium 611.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (9)
1. A double-limb thick angle steel with a circular arc apex angle is characterized by comprising a first limb and a second limb which are intersected to form a preset included angle;
the intersection of the first limb and the second limb on the outer surface of the angle steel is arc-shaped, and the thickness of the angle steel at the intersection of the arc shapes is more than or equal to the thickness of the first limb and the second limb;
the first limb and the second limb comprise at least one boss part protruding out of the inner surface or the outer surface of the first limb and the second limb, the moment of inertia of the angle steel is not less than that of the angle steel corresponding to the angle steel standard specification, and the cross-sectional area of the angle steel is less than that of the angle steel corresponding to the angle steel standard specification.
2. The angle iron according to claim 1, characterized in that the radius of the circular arc is 1-5 mm.
3. The angle iron according to claim 1, wherein the angle iron is a symmetrical structure with a center line of the predetermined included angle as a symmetry axis, and the predetermined included angle is a right angle.
4. The angle iron of claim 1, wherein an outer edge of the boss portion is flush with an edge of the end of the first and second limbs distal from the intersection of the first and second limbs.
5. The angle iron of claim 1, wherein the arc apex angle double limb thick angle iron is formed by hot rolling.
6. Angle steel according to claim 1, characterized in that the thickness (t) of the first or second limb1) The difference from the standard limb thickness is less than 10% of the standard limb thickness.
7. Angle steel according to claim 1, characterized in that the thickness (t) of the boss part2-t1) 10% of the standard limb thickness.
8. Angle iron according to claim 1, characterized in that the width of the boss part in the direction of extension of the first or second limb is more than 15% of the length of the first or second limb in angle iron section.
9. A design method of the angle iron as claimed in any one of claims 1-8, characterized in that the method comprises:
determining standard specification parameters of the angle steel;
determining the arc radius of the arc-shaped top angle of the outer surface of the angle steel;
determining initial limb thickness (t)1) Thickness (t) of boss portion2-t1) And an initial width ratio;
determining the ratio of the moment of inertia and the cross-sectional area formed by the angle steels with different arc radiuses to obtain the inertia product ratio corresponding to the different arc radiuses;
fitting all the inertia product ratios according to the arc radius to obtain an inertia product ratio curve, and obtaining the optimal arc radius corresponding to the highest inertia product ratio;
fixing the arc radius of the angle steel to be the optimal arc radius, adjusting the limb thickness and the width of the boss part, and determining that the inertia moment of the angle steel is not less than the inertia moment of the angle steel corresponding to the standard specification of the angle steel and the sectional area of the angle steel is less than the optimal limb thickness and the width of the boss part of the section of the angle steel corresponding to the standard specification of the angle steel;
and obtaining the overall optimal design parameters of the double-limb thick angle steel according to the optimal arc radius, the optimal limb thickness and the width of the boss part, and designing the double-limb thick angle steel according to the optimal design parameters.
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|---|---|---|---|---|
| GB478442A (en) * | 1935-10-01 | 1938-01-19 | Nordiska Armaturfab Ab | Improvements in or relating to girders, profile irons and the like |
| EP0771595A1 (en) * | 1994-07-19 | 1997-05-07 | Sumitomo Metal Industries, Ltd. | Rolling mill for producing angle steel from hoop steel and method for rolling angle steel using the rolling mill |
| CN2378620Y (en) * | 1999-05-10 | 2000-05-17 | 李建民 | Angle steel |
| JP2007216251A (en) * | 2006-02-15 | 2007-08-30 | Jfe Steel Kk | Unequal legged angle iron of unequal thickness strength of which is different in long side and short side and method of manufacturing it |
| CN201141222Y (en) * | 2007-11-30 | 2008-10-29 | 国网北京电力建设研究院 | Novel electric power line tower structure diagonal member |
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- 2020-02-25 CN CN202010115371.XA patent/CN111339613A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB478442A (en) * | 1935-10-01 | 1938-01-19 | Nordiska Armaturfab Ab | Improvements in or relating to girders, profile irons and the like |
| EP0771595A1 (en) * | 1994-07-19 | 1997-05-07 | Sumitomo Metal Industries, Ltd. | Rolling mill for producing angle steel from hoop steel and method for rolling angle steel using the rolling mill |
| CN2378620Y (en) * | 1999-05-10 | 2000-05-17 | 李建民 | Angle steel |
| JP2007216251A (en) * | 2006-02-15 | 2007-08-30 | Jfe Steel Kk | Unequal legged angle iron of unequal thickness strength of which is different in long side and short side and method of manufacturing it |
| CN201141222Y (en) * | 2007-11-30 | 2008-10-29 | 国网北京电力建设研究院 | Novel electric power line tower structure diagonal member |
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