CN114016619A - Novel steel pipe column flange inner sleeve splicing node and mechanical property analysis method - Google Patents
Novel steel pipe column flange inner sleeve splicing node and mechanical property analysis method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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Abstract
The invention relates to the technical field of assembled steel structures, in particular to a novel flange in-band sleeve splicing node of a steel pipe column and a mechanical property analysis method, wherein the method comprises the following steps: 1) determining the splicing node structure of the steel pipe column flange inner sleeves, the size of the flange inner sleeves, the specification and the number of bolts; 2) establishing a splicing node model of the steel pipe column flange inner sleeve by adopting a finite element method; 3) through variable parameter analysis of the steel pipe column splicing node, the influence of different parameter values on the bearing capacity and hysteretic performance of the node and the whole member is discussed, and a reasonable value range is given; 4) and carrying out contrastive analysis on the mechanical properties of the novel flange in-band sleeve splicing node and the traditional node of the steel pipe column. The invention can effectively reduce the bolt tension and inhibit the warping of the flange plate; the node has the characteristics of high bearing capacity, good ductility and hysteretic performance, high field assembly speed and high construction efficiency; the analysis method preferably verifies the feasibility of the novel node in engineering applications.
Description
Technical Field
The invention relates to the technical field of assembled steel structures, in particular to a novel flange in-band sleeve splicing node applied to a steel pipe column in an assembled steel structure and a mechanical property analysis method.
Background
The development of the fabricated steel structure building is beneficial to promoting the green and healthy development of the industry and improving the building performance, and along with the improvement of the labor cost of China, the fabricated steel structure building is more and more applied to civil buildings under the strong advocation and policy encouragement of China. The main advantages of the assembled steel structure are: light dead weight, large rigidity, short construction period, small environmental pollution and capability of realizing higher mechanized construction. Therefore, with the continuous improvement of the assembly type building research, more and more building developers adopt the assembly type steel structure building. Splicing nodes in the fabricated building are always the key points of quality control in design and construction, and the key point of node research is how to fully utilize the nodes to exert the advantages of the fabricated building.
The square steel pipe column and the round steel pipe column in the traditional steel frame are mainly connected by welding seams and flanges. The welding has the advantages that: the structure is simple, the application range is wide, and the steel column connecting device can be applied to steel column connection in various forms; the material is economical, the connection sealing performance is good, and the structural rigidity is easy to meet. The disadvantages are that: a heat affected zone is easily formed at the welding position, so that the internal structure of the steel is changed, and local brittle failure is caused; residual strain and residual stress left by welding can reduce the bearing capacity of the structure; once local cracks occur in the welded structure, the whole component is easily affected, and meanwhile, the low-temperature cold-brittleness phenomenon of the welded joint is also prominent. The steel structure building is because the component can only be assembled at the building site, and welding operation's quality control that can not be fine, and the welding seam is connected and is higher to on-the-spot precision requirement, generally can set up the otic placode and fix a position, still need amputate the otic placode after the welding is accomplished, can increase work load, therefore this connected mode is applied to in the prefabricated assembly type building. If the rigidity of the joint is not enough in flange connection, the rigidity of the flange plate is generally improved by additionally arranging stiffening ribs or increasing the thickness of a flange, but the additionally arranged stiffening ribs are mainly connected with a component through welding seams, residual stress exists due to excessive welding seams, the stress of the joint is not facilitated, and the flange plate is easy to deform excessively and break due to bolts in the flange connection, so that the joint is also not enough.
Disclosure of Invention
The invention aims to solve the problems of residual stress and the like existing in traditional welding and flange connection in an assembly steel structure, and provides a novel flange in-band sleeve splicing node applied to a steel pipe column in the assembly steel structure and a mechanical property analysis method aiming at the current situation that the assembly steel structure is rapidly developed and the splicing node form of the steel pipe column is single at present, so that the respective advantages of a flange and an inner sleeve are fully exerted, the node rigidity, the bearing capacity and the energy consumption capacity are enhanced, the bolt tension is reduced, the flange plate warpage is inhibited, and the like.
According to the novel flange splicing node with the inner sleeve of the steel pipe column, the splicing node is spliced by adopting the flange plates with the inner sleeve, and the flange plates are connected in a friction mode by adopting high-strength bolts.
The invention discloses a mechanical property analysis method for a novel flange in-band sleeve splicing node of a steel pipe column, which comprises the following steps of:
1) determining a splicing node structure, and determining the size, the specification and the number of bolts of the inner sleeve of the flange;
2) establishing a splicing node model of the steel pipe column flange inner sleeve by adopting a finite element method;
3) through variable parameter analysis of the steel pipe column splicing node, the influence of different parameter values on the bearing capacity and hysteretic performance of the node and the whole member is discussed, and a reasonable value range is given;
4) and carrying out contrastive analysis on the mechanical properties of the novel flange in-band sleeve splicing node and the traditional node of the steel pipe column.
Preferably, in the step 2), the step of establishing the splicing node model of the steel pipe column flange inner sleeve is as follows:
(1) defining material attributes, determining interaction, boundary conditions and loading system;
(2) grid division;
(3) finite element solving;
(4) outputting a calculation result;
(5) and (4) post-processing and visualizing the result.
Preferably, in the step 3), the variable parameter analysis of the splicing node of the novel flange belt inner sleeve of the steel pipe column specifically comprises the following steps:
3.1, setting the number and position parameters of the bolts;
3.2, analyzing the stress distribution of the steel pipe column;
3.3, analyzing the stress of the inner sleeve of the flange;
3.4, analyzing stress distribution and stress of the bolt group;
3.5, analyzing a load-displacement curve;
3.6, analyzing a hysteresis curve;
3.7, analyzing a skeleton curve;
and 3.8, analyzing the equivalent viscous damping coefficient.
Preferably, in the step 4), the mechanical property comparison analysis of the novel flange in-band sleeve splicing node of the square-round steel pipe column and the traditional node comprises the following specific steps:
4.1, designing a test piece;
4.2, mechanical property under the action of monotonic load;
(1) comparing stress cloud charts of the steel pipe column;
(2) comparing stress cloud charts of the bolt groups;
(3) comparing load-displacement curves;
4.3, mechanical property under the action of cyclic load;
(1) comparing hysteresis curves;
(2) comparing skeleton curves;
(3) and comparing equivalent viscous damping coefficients.
The invention has the following advantages:
1. adopt this kind of novel node of flange inner skleeve can effectively improve node bearing capacity and power consumption ability at post concatenation node, and the novel node of flange inner skleeve compares with traditional assembled node, and flange thickness and bolt figure are the same, and the novel node rigidity of flange inner skleeve is higher. The inner sleeve and the stiffening rib in the novel node have the same function, the rigidity of the node is increased, and the bearing capacity and the energy consumption capacity of the test piece can be enhanced; the flange inner sleeve joint is superior to the traditional joint with stiffening ribs in the local member stress of the test piece, and the concrete performance is to reduce the bolt tension and inhibit the flange plate from warping.
2. The finite element method has the advantages that:
(1) the mechanical concept is clear and popular and easy to understand. Finite element understanding can be established on different theoretical levels, not only can strict mathematical theoretical analysis be established, but also can be understood through visual post-processing cloud pictures and various curves.
(2) Has better adaptability. Many complex actual structures are not easy to solve, and the analysis of the complex structures can be completed by using a finite element method. Although the finite element method is an approximate solution, satisfactory effect can be achieved by selecting proper unit size and shape, and the situation is close to the real situation.
(3) Possesses stronger practicality. The finite element method is not only suitable for the problems of homogeneous materials, isotropy and the like, but also can be used for calculating the problems of heterogeneous materials, anisotropy and the like, and has wide application range.
(4) High efficiency suitable for computer implementation.
3. The finite element method unit shape is not limited to a regular grid, and the shape and the size of each unit are not required to be the same, so that the finite element method is more adaptive and has higher discrete precision when processing complex geometric shapes and boundary conditions.
Drawings
FIG. 1 is a flow chart of a mechanical property analysis method of a novel flanged inner sleeve splicing node of a steel pipe column in embodiment 1;
FIG. 2 is a stress cloud plot of the novel fabricated pillars of example 1;
FIG. 3 is a stress cloud plot of Mises of a conventional flange column in example 1;
FIG. 4 is a load-displacement curve diagram of an SBN series test piece in example 1;
FIG. 5 is a hysteresis curve chart of an SBN series test piece in example 1;
FIG. 6 is a skeleton diagram of an SBN test piece in example 1;
FIG. 7 is a schematic view of SCM and CCM series of test pieces in example 1;
FIG. 8 is a stress cloud plot of Mises of SCM and CCM series of test pieces in example 1;
FIG. 9 is a stress cloud plot of bolt portions of SCM and CCM series test pieces in example 1;
FIG. 10 is a load displacement relationship graph of SCM series test pieces in example 1;
FIG. 11 is a load displacement relationship graph of an SCM series test piece in example 1;
FIG. 12 is a hysteresis curve chart of SCM series test pieces in example 1;
FIG. 13 is a hysteresis curve chart of a CCM series test piece in example 1;
FIG. 14 is a skeleton diagram of SCM series test pieces in example 1;
FIG. 15 is a skeleton diagram of a CCM series of test pieces in example 1.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention and not limiting.
Example 1
The embodiment provides a novel flange in-band sleeve concatenation node of steel-pipe column, adopts 10.9 grades of M20 high strength friction type bolted connection between the concatenation node flange board.
Square steel pipe column splicing joint design
(1) The section size of the square steel pipe column is 200mm multiplied by 10 mm. The height of the column is 3000 mm. Q355B grade is selected as steel material, f is 305N/mm2，fy＝355N/mm2Elastic modulus E2.06X 105N/mm2The Poisson's ratio was 0.3. The inner sleeve of the flange is made of Q355B grade steel. The flange plates are connected with each other by 10.9-grade M20 high-strength friction type bolts.
(2) The size of the inner sleeve is 178mm multiplied by 12mm according to the equal strength design principle. When the inner sleeve is not considered, the flange plate has certain rigidity and the thickness is not smaller than 16mm, so the thickness of the flange plate is 20mm according to the prior research result under the condition of considering the safety and not considering the action of the inner sleeve, and the size of the flange plate is 330mm multiplied by 330mm according to the structural requirements of bolt margin and the like.
(3) The bolt figure is when satisfying minimum interval according to the flange bolt figure value commonly used in the engineering, and proposes the bolt should evenly arrange around the flange according to the standard for the atress is even, easy to assemble.
Circular steel pipe column splicing joint design
(1) The section size of the round steel pipe column is phi 219 multiplied by 10mm, and the column height is 3000 mm. Q355B grade steel is selected, and f is 305N/mm2、fy＝355N/mm2Elastic modulus E2.06X 105N/mm2The Poisson's ratio was 0.3. The inner sleeve of the flange is made of Q355B grade steel. And the flange plates at the splicing nodes are connected by adopting 10.9-grade M20 high-strength friction type bolts.
(2) Under the condition of safety, the inner sleeve is supposed to be phi 196 multiplied by 12 mm. According to the results of the conventional research, the thickness of the flange plate is 20mm, and the outer diameter of the flange plate is 363mm according to the structural requirements such as bolt margin.
As shown in fig. 1, the embodiment provides a mechanical property analysis method for a splicing node of a novel flange belt inner sleeve of a steel pipe column, which includes the following steps:
1) determining a splicing node structure, and determining the size, the specification and the number of bolts of the inner sleeve of the flange;
2) establishing a splicing node model of the steel pipe column flange inner sleeve by adopting a finite element method;
the method comprises the following specific steps:
(1) defining material attributes, determining interaction, boundary conditions and loading system;
defining material properties
All steel members related to the square steel pipe column are made of Q355B-grade steel, and the splicing positions of the flange plates are connected through 10.9-grade M20 high-strength friction type bolts. The material properties are shown in Table 2-1.
TABLE 2-1 Material Property indices
Steel has sufficient deformability to enable the structure to reach the load-bearing limit, so steel is assumed to be an ideal elastoplastic body.
Determining interactions
For the new type of fabricated node under study, the weld joint is not modeled separately, but the welding action between the members is simulated by binding (Tie) constraint, and the specific arrangement is shown in table 2-2.
TABLE 2-2 Material Property indices
Considering the friction among all the parts, a surface-to-surface contact mode is adopted, and the inner surface of the column, the outer surface of the inner sleeve and the outer side of the flange of the column are all rust-free clean surfaces, so that the friction coefficient in the tangential direction is defined to be 0.35, the contact surface of the flange is subjected to sand blasting treatment, the friction coefficient is 0.45, and the normal direction is in hard contact. The major surface was a surface having a high rigidity, and the specific arrangement is as shown in tables 2 to 3.
Tables 2-3 interaction definition tables
Boundary conditions and loading regimes
For the established finite element model, the pretension force applied to the high-strength friction type bolt is simulated by establishing a load function to apply bolt load at the middle section of the bolt and appointing a direction vector. And a fixed end constraint is arranged at the bottom of the column to constrain translation and rotation in three directions. And no constraint is arranged at the top of the column, so that the column is a bending component at a free end, and the displacement loading position is subjected to x-direction freedom degree coupling during loading.
With respect to static loading, a combination of selective force and displacement loading, a fixed axial pressure is applied at the column top, followed by a progressively increasing lateral displacement at the column top. The power adopts a variable amplitude displacement loading method, the amplitude of each stage circulates once before yielding, and the amplitude of each stage circulates twice after yielding, and the specific loading system is shown in tables 2-4.
Tables 2-4 Loading System parameter tables
(2) Grid division;
all components adopt 8-node hexahedron linear reduction integral units C3D8R to grid the solid units. In terms of grid size, the grids are subjected to convergence analysis, and for the research component, each grid is divided into: the grid seed size of post is 40mm, and the grid seed size of inner skleeve is 20mm, and the grid size of flange board is 10mm, and the grid size of high strength bolt is 5 mm.
(3) Finite element solving;
in order to verify the feasibility of the novel node applied to the assembled splicing column, the designed column and the traditional assembled flange connecting column are compared in axial bearing capacity, and the bearing capacity of the designed assembled column is basically not different from that of the traditional flange column after the loading is finished according to the graph shown in fig. 2 and fig. 3, so that the practical feasibility of the designed assembled splicing column is demonstrated.
(4) Outputting a calculation result;
(5) and (4) post-processing and visualizing the result.
3) Through variable parameter analysis of the novel flange in-band sleeve splicing node of the steel pipe column, the influence of different parameter values on the bearing capacity and hysteresis performance of the node and the whole member is discussed, and therefore a reasonable value range is given;
the method specifically comprises the following steps:
3.1, setting the number and position parameters of the bolts;
five test pieces (SBN: Bolts number of square column series) are selected for bearing capacity performance study when the influence of the number and the positions of the Bolts on the mechanical performance of the node is studied, only the number and the positions of the Bolts of each test piece are changed, in addition, other parameters are kept unchanged, and the specific values of the number and the positions of the Bolts are shown in a table 3-1.
TABLE 3-1 SBN series test piece parameter design
3.2, analyzing the stress distribution of the steel pipe column;
when the number of the bolts is 4, the bearing capacity of the node is insufficient, and the stress of the node is uneven; when the number of the bolts is not less than 8, force is uniformly transferred in the splicing area, and when the number of the bolts is the same, the bolts are arranged in the middle of each side and can enable the stress of the component to be more uniform than the bolts arranged at each corner. It can be seen that changing the number and positions of the bolts affects the transmission of shear and bending moments at the joints of the upper and lower columns, and too few bolts cause uneven stress at the joints.
3.3, analyzing the stress of the inner sleeve of the flange;
when 4 bolts are used, the insufficient bolt load capacity results in significant buckling deformation of the inner sleeve due to the small number of bolts. When the number of the bolts is 8, the bearing capacity of the bolts meets the requirement, so that the stress of the inner sleeve is smaller, and the bolts are uniformly distributed to ensure that the stress of the inner sleeve of the flange is more uniform; when the number of the bolts is increased continuously, the stress of the inner sleeve of the flange is reduced continuously, which shows that the number of the bolts is more, so that the bearing capacity at the node is higher. The change of the position of the bolt has certain influence on the stress of the inner sleeve, but has little influence on the whole stress. Therefore, changing the number of bolts can make the node better stressed, and if the number of bolts is too small, the node is not stressed, and the inner sleeve is stressed too much.
3.4, analyzing stress distribution and stress of the bolt group;
when the number of the bolts is 4, the requirement of node connection is not met, and the bolts on the tension side deform obviously. When the number of the bolts is 8, the bolts have no obvious deformation, and the stress of a single bolt is more uniform than that of 4 bolts. An even distribution of the bolts will result in a more even stress on the bolt groups, mainly 2 bolts on the tension side taking the maximum tension when the bolts are arranged on each side of the flange. Along with the continuous increase of the number of the bolts, the stress of the bolt group is obviously reduced, and the bearing capacity of the bolts is more surplus. Therefore, for splicing the inner sleeves of the flanges of the columns, the number of the bolts should meet the corresponding structural requirements, and for the novel node, the number of the bolts is not less than 8, and the bolts should be uniformly distributed around the flanges.
3.5, analyzing a load-displacement curve;
as shown in FIG. 4, in the initial stage of column loading, as the number of bolts is increased, the node rigidity is increased continuously, and the bearing capacity of the test piece is increased. When the test piece yields, the stress of the test piece is basically the same. The rigidity of the node can be increased to a certain extent by increasing the number of the high-strength bolts, but the ultimate bearing capacity of the member is basically not influenced by the analysis of the whole stress condition.
3.6, analyzing a hysteresis curve;
as can be seen from FIG. 5, the hysteresis curves of BASE, SBN-1 and SBN-2 are full fusiform and have no pinch phenomenon, which indicates that when the number of bolts is more than 8, the energy consumption capability of the test piece is better. The hysteresis curves of SBN-3 and SBN-4 are not full, which indicates that the energy consumption capability of the test piece is weak. Therefore, the hysteresis curve can be used for analyzing that the number of the bolts is not less than eight for the node.
3.7, analyzing a skeleton curve;
as shown in fig. 6, the shapes of skeleton curves of SBN series test pieces are basically the same, the former stage is a linear relationship, the bearing capacity of the test piece is not increased obviously after the member is bent, and due to the existence of the inner sleeve, the test piece still meets the requirements of 'strong node and weak member'. Therefore, the bearing capacity of the test piece under the action of reciprocating load is basically not influenced by changing the positions and the number of the bolts.
And 3.8, analyzing the equivalent viscous damping coefficient.
As shown in table 3-2, the equivalent viscous damping coefficient of the SBN series test piece is in a significantly decreasing trend along with the decrease of the number of bolts, wherein when the number of bolts is 4, the difference of the positions of the bolts has a large influence on the equivalent viscous damping coefficient of the test piece, and when the number of bolts is greater than 8, the influence of the change of the positions of the bolts on the equivalent viscous damping coefficient of the test piece is almost negligible. Therefore, the table shows that the energy consumption capability of the test piece is low when the number of the bolts is less than 8, and the test piece has good energy consumption capability when the number of the bolts is more than or equal to 8.
TABLE 3-2 SBN series test piece equivalent viscous damping coefficient
4) Comparing and analyzing the mechanical properties of the splicing node of the novel flange belt inner sleeve of the steel pipe column and the traditional node;
the method comprises the following specific steps:
4.1, designing a test piece;
for the square steel pipe column flange inner sleeve connection, through the variable parameter analysis in the foregoing, the sizes of the components of the square steel pipe column flange inner sleeve node adopted in the method are as follows: the thickness of the flange is 15mm, the length of the inner sleeve is 600mm, 8 bolts are uniformly arranged, and other parameters and material properties are the same as those of the bolts; the sizes of all members of the round steel pipe column flange inner sleeve node are as follows: the flange thickness is 15mm, and inner skleeve length is 600mm, and 8 evenly arranged bolts adopt, and other parameters and material property are the same before.
As shown in fig. 7. The cross-sectional dimension, the bolt model and the steel property of the comparison node model column are the same as those of the basic test piece. Wherein SCM-1 is connected with a square steel pipe column flange inner sleeve; SCM-2 is that the square steel pipe column is connected through the traditional flange; SCM-3 is that the square steel-pipe column adopts the stiffening rib flange joint. CCM-1 is connected with a round steel pipe column flange inner sleeve; CCM-2 is a round steel pipe column connected through a traditional flange; CCM-3 is formed by connecting round steel pipe columns by using stiffening rib flanges. The concrete parameters of each test piece are shown in Table 4-1.
TABLE 4-1 test piece node Difference parameters
4.2, mechanical property under the action of monotonic load;
(1) comparing stress cloud charts of the steel pipe column;
fig. 8 shows the mises stress cloud chart of the SCM and CCM series test pieces after the monotonic loading is finished under the monotonic loading effect, and the graph shows that the inner sleeve can obviously improve the node strength, so that the test pieces meet the requirements of 'strong nodes and weak components'. When the inner sleeve and the stiffening rib are not arranged, the opening of the flange at the tension side of the node is too large, and the bolt can deform under tension, so that the strength of the node can not meet the requirement; the stiffening rib is added to improve the strength of the node and inhibit the deformation of the flange plate, so that the bottom of the column is yielding before the node, but the bolt at the node bears the whole load, the stress of the bolt is still large, and the flange is still locally deformed, so that the effect of the stiffening rib is still weaker than that of the inner sleeve. Through the comparison of SCM and CCM test pieces, the cylinder is better than the square column in stress performance under the same displacement load effect.
(2) Comparing stress cloud charts of the bolt groups;
fig. 9 shows the mises stress cloud charts of the bolt groups after the SCM and CCM series test pieces are subjected to monotonic loading, as shown in the figure, the SCM and CCM series test pieces are the bolt groups with inner sleeves, the stress is the minimum, the bolt stress is more abundant, the stress of the bolt groups of the test pieces with stiffening ribs is smaller than that of the test pieces without stiffening ribs, the stress of the bolts on the tension side of the test pieces without stiffening ribs is too large, and the bolts have obvious deformation, which indicates that the common flange connection bolt groups are easy to be damaged due to the too large transverse stress. From data analysis, it can be seen that the presence of the inner sleeve can reduce the tension of the bolt by 20% to 30%. Therefore, as can be seen from the stress cloud chart of the bolt group, the inner sleeve can effectively reduce the stress of the bolt group, so that the joint strength of the test piece meets the requirement; the stiffening ribs can inhibit deformation of the nodes, and can improve the rigidity of the nodes to a certain extent when the bolts are not damaged, but can not effectively reduce the overall stress of the bolt group. The SCM and CCM comparison may again verify that the cylinder is stressed better than the column.
(3) Comparing load-displacement curves;
fig. 10 shows a load-displacement relationship curve of SCM series test pieces. As shown in the figure, the SCM-2 test piece has no linear increase and obvious buckling phenomenon due to low rigidity at the node, and the node does not meet the node splicing requirement. Load displacement curves of the SCM-1 test piece and the SCM-3 test piece are basically the same, and the load borne by the SCM-1 test piece with the inner sleeve is slightly lower than that of the SCM-3 test piece under the same displacement in the whole stress process of the test piece only because the SCM-1 test piece with the inner sleeve has the coordination effect of the inner sleeve.
Fig. 11 shows a load-displacement relationship curve of CCM series test pieces. As shown in the figure, the CCM-2 test piece has no linear increase and obvious yield phenomenon because the rigidity at the node is low, and the node does not meet the node splicing requirement. After the CCM-1 test piece acts on the inner sleeve, the load displacement curve of the test piece is basically the same as that of the CCM-3 test piece; when the transverse displacement reaches 20mm, the inner sleeve starts to play a role, so that the stress of the CCM-1 test piece is obviously higher than that of the CCM-2 test piece. The yield displacement and the load of the CCM-1 and the CCM-3 are the same, and after the test piece is yielded, the whole stress of the test piece with the inner sleeve is slightly lower than that of the CCM-3 test piece.
4.3, mechanical property under the action of cyclic load;
(1) comparing hysteresis curves;
fig. 12 shows hysteresis curve patterns of SCM series test pieces. As can be seen from the figure, when no inner sleeve and stiffening rib are arranged at the node, the hysteresis curve of the test piece is extremely pinched and basically has no energy consumption capability; when the node is provided with the stiffening rib to inhibit the deformation of the flange plate, as shown in the figure, the SCM-3 test piece has good energy consumption capability; by applying the novel node provided by the embodiment, the inner sleeve can well play a role, so that the hysteresis curve of the SCM-1 test piece is very full, and the whole energy consumption of the test piece is also very favorable. Therefore, it can be seen that the novel node provided by the embodiment has strong feasibility in splicing of the square steel pipe column and is more outstanding in energy consumption capability than the traditional node.
FIG. 13 shows hysteresis curve patterns of CCM series of test pieces. As can be seen, when no inner sleeve and no stiffening rib are arranged at the node, the hysteresis curve of the test piece is extremely pinched and basically has no energy consumption capability. When the node is provided with the stiffening rib to inhibit the deformation of the flange plate, as shown in the figure, the CCM-3 test piece has good energy consumption capability, and by applying the novel node provided by the embodiment, the inner sleeve can play a good role, so that the hysteresis curve of the CCM-1 test piece is full, and the whole energy consumption of the test piece is also favorable. Therefore, it can be seen that the novel node provided by the embodiment has strong feasibility in splicing of round steel pipe columns and has stronger energy consumption capability than the traditional node.
(2) Comparing skeleton curves;
FIG. 14 is a comparison graph of skeleton curves of SCM series test pieces, and as shown in the figure, under the action of reciprocating loads, the bearing capacity of the SCM-2 test piece is obviously lower than that of the SCM-1 test piece and the SCM-3 test piece. When the node of the test piece is reinforced by the stiffening rib or the inner sleeve, the skeleton curves of the test piece are basically superposed, which shows that the inner sleeve and the stiffening rib have basically the same function on the whole stress of the test piece, and both play a role in reinforcing the local rigidity of the node.
FIG. 15 is a skeleton curve comparison diagram of a CCM series test piece, and as shown in the figure, the bearing capacity of the CCM-2 test piece under the reciprocating load action is obviously lower than that of the CCM-1 test piece and the CCM-3 test piece. When the node of the test piece is reinforced by the stiffening rib or the inner sleeve, the skeleton curves of the test piece are basically superposed, which shows that the inner sleeve and the stiffening rib have basically the same function on the whole stress of the test piece, and both play a role in reinforcing the local rigidity of the node.
(3) And comparing equivalent viscous damping coefficients.
The equivalent viscous damping coefficient of the SCM series test piece is shown in table 4-2. The bearing capacity of the SCM-1 test piece is basically the same as that of the SCM-3 test piece, but the energy consumption capacity is greatly different, and the existence of the inner sleeve can obviously improve the equivalent viscous damping coefficient of the test piece, so that the energy consumption capacity of the test piece is better. The SCM-2 test piece has almost no energy consumption capability due to the insufficient node rigidity. The difference of the equivalent viscous damping coefficients shows that the novel node provided by the embodiment has a certain value.
TABLE 4-2 SCM series test-piece equivalent viscous damping coefficient
The equivalent viscous damping coefficient of the CCM series test piece is shown in table 4-3. The energy consumption capacity of the test piece is basically the same as that of an SCM series test piece, the difference between the energy consumption capacities of the CCM-1 test piece and the CCM-3 test piece is large, and the equivalent viscous damping coefficient of the test piece can be obviously improved due to the existence of the inner sleeve, so that the energy consumption capacity of the test piece is better. The CCM-2 test piece has almost no energy consumption capacity due to the insufficient node rigidity.
TABLE 4-3 CCM series test piece equivalent viscous damping coefficient
ABAQUS finite element analysis software is adopted to analyze the mechanical property of the splicing node of the inner sleeve of the flange of the steel frame column. Firstly, respectively establishing a square steel pipe model and a round steel pipe column model, and analyzing the changes of bearing capacity of the square steel pipe model and the round steel pipe column model in monotonous load and reciprocating load; then, variable parameter analysis is carried out on the spliced nodes of the steel pipe column and the round steel pipe column of the opposite side, the influence of different parameter values on the bearing capacity and hysteresis performance of the node and the whole member is discussed, and a reasonable value range is given; finally, the bearing capacity and the energy consumption capacity of the novel assembled node and the traditional assembled node under the monotonous and cyclic load effects are contrastively analyzed, the feasibility of the novel assembled node in engineering application is verified, and the following main conclusions are obtained:
(1) the column splicing node determined by the design method in the process meets the requirements of 'strong node and weak member', so that the damage positions of the test piece are all arranged at the end part of the lower column, the rigidity of the splicing node of the inner sleeve of the flange is higher, and the whole stress of the node has larger margin.
(2) The number of the bolts is increased to a certain extent, so that the rigidity of the joint at the splicing part is improved. Due to the existence of the inner sleeve, even if the number of the bolts is small, the rigidity of the node still meets the requirement. Therefore, when an inner sleeve is present, the number of bolts can be determined according to the construction requirements and the stress requirements.
(3) With the increase of the length of the inner sleeve, the local bending moment at the node is increased, and the tensile force of the bolt is obviously reduced, so that for the test piece designed by the invention, when the length of the inner sleeve is 600mm, the tensile force of the bolt can be effectively reduced by 20-30%. The inner sleeve plays a role in restraining column deformation when the test piece has large deformation, so when the thickness of the flange and the number of the bolts meet the rigidity requirement, the inner sleeve is not short enough, and the optimal value of the test piece designed according to the embodiment is not smaller than 600 mm.
(4) When the thickness of the flange is less than 15mm, the rigidity of the whole node is low, and if the flange plate is too thick, the stress of the inner sleeve is small, so that the performance of the node cannot be fully exerted. After the test piece is subjected to overall analysis, the energy consumption capability of the test piece is gradually improved along with the increase of the thickness of the flange, but when the thickness is larger than 20mm, the improvement range of the energy consumption coefficient is small. Therefore, the thickness of the flange plate should be in the range of 15mm to 22mm, and the flange plate is not too thin or too thick.
(5) The increase of the axial pressure ratio increasingly limits the plastic deformation of the column, and is beneficial to improving the bearing capacity of the test piece under the action of monotonic load but not beneficial to the energy consumption of the test piece. The effect of the increase in the axial compression ratio on the whole of the test piece is mainly manifested by premature yielding of the lower column end. And analyzing the local part of the node, wherein the node is not positioned at the most adverse position of the column stress, so when the rigidity of the node meets the requirement, the axial pressure ratio has smaller influence on the spliced node.
(6 compare square steel tubular column and round steel tubular column and can see that the cylinder atress is more even under different parameter settings for the square column, and resists the ability of warping better.
(7) The novel node of flange inner sleeve is adopted at column splicing node, and the bearing capacity and energy consumption capacity of the node can be effectively improved. The inner sleeve and the stiffening rib in the novel node have the same function, the rigidity of the node is increased, and the bearing capacity and the energy consumption capacity of the test piece can be enhanced; the flange inner sleeve joint is superior to the traditional joint with the stiffening rib in the local member stress of the test piece, and the concrete performance is to reduce the bolt tension and inhibit the flange plate from warping.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (5)
1. Novel flange in-band sleeve concatenation node of steel-pipe column, its characterized in that: the splicing nodes are spliced by adopting flange plates with inner sleeves, and the flange plates are connected in a friction mode by adopting high-strength bolts.
2. The mechanical property analysis method of the novel flange in-band sleeve splicing node of the steel pipe column is characterized by comprising the following steps of: the method comprises the following steps:
1) determining a splicing node structure, and determining the size, the specification and the number of bolts of the inner sleeve of the flange;
2) establishing a splicing node model of the steel pipe column flange inner sleeve by adopting a finite element method;
3) through variable parameter analysis of the steel pipe column splicing node, the influence of different parameter values on the bearing capacity and hysteretic performance of the node and the whole member is discussed, and a reasonable value range is given;
4) and carrying out contrastive analysis on the mechanical properties of the novel flange in-band sleeve splicing node and the traditional node of the steel pipe column.
3. The method for analyzing the mechanical property of the splicing joint of the novel steel pipe column flange with the inner sleeve is characterized in that: in the step 2), the step of establishing the splicing node model of the steel pipe column flange inner sleeve is as follows:
(1) defining material attributes, determining interaction, boundary conditions and loading system;
(2) grid division;
(3) finite element solving;
(4) outputting a calculation result;
(5) and (4) post-processing and visualizing the result.
4. The method for analyzing the mechanical property of the splicing joint of the novel steel pipe column flange with the inner sleeve is characterized in that: in the step 3), the variable parameter analysis of the novel flange in-band sleeve splicing node of the steel pipe column specifically comprises the following steps:
3.1, setting the number and position parameters of the bolts;
3.2, analyzing the stress distribution of the steel pipe column;
3.3, analyzing the stress of the inner sleeve of the flange;
3.4, analyzing stress distribution and stress of the bolt group;
3.5, analyzing a load-displacement curve;
3.6, analyzing a hysteresis curve;
3.7, analyzing a skeleton curve;
and 3.8, analyzing the equivalent viscous damping coefficient.
5. The method for analyzing the mechanical property of the splicing joint of the novel steel pipe column flange with the inner sleeve is characterized in that: in the step 4), the mechanical property comparison analysis of the novel flange in-band sleeve splicing node of the square-round steel pipe column and the traditional node comprises the following specific steps:
4.1, designing a test piece;
4.2, mechanical property under the action of monotonic load;
(1) comparing stress cloud charts of the steel pipe column;
(2) comparing stress cloud charts of the bolt groups;
(3) comparing load-displacement curves;
4.3, mechanical property under the action of cyclic load;
(1) comparing hysteresis curves;
(2) comparing skeleton curves;
(3) and comparing equivalent viscous damping coefficients.
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