CN1333141C - Combined concrete shear wall with built-in eccentric supporting steel truss and its making method - Google Patents

Abstract

The present invention relates to a concrete combined shearing wall in which an eccentric brace steel truss is hidden, and a manufacturing method thereof. The shearing wall has the structure that two rows of reinforcing meshes are arranged in a shearing wall plate, a sectional steel hidden support (10) and steel bar hidden supports(17) are additionally arranged between the reinforcing meshes. The present invention is characterized in that an eccentric support steel truss (1) is hidden in the concrete shearing wall, and is composed of a sectional steel column, a sectional steel beam and a sectional steel support; designed bearing capacity need to satisfy requirements for strong columns, strong supporting and weak energy dissipation of the beam segments so as to satisfy that when the beam segments achieve sheared yielding, the rest segments are still in no-yielding stressed state. The steel bar hidden supports are distributed at the periphery of the sectional steel hidden support, and pass round the sectional steel beam so as to be anchored. The eccentric sectional steel support of the hidden truss and the steel bar hidden supports form a sectional steel reinforced concrete hidden support, and the sectional steel reinforced concrete hidden support can present the shape of Y, the shape of X or the shape like the Chinese character 'ba'. Compared with the existing shearing wall, the shearing wall of the present invention has the advantages of large initial stiffness, high bearing capacity, multiple shock-resistance defence lines, good tensibility and strong integral shock-resistance energy-consumption capability.

Description

Steel truss concrete composite shear wall with built-in eccentric support and its manufacturing method

technical field

The invention relates to a concrete composite shear wall with built-in eccentric support steel truss and a manufacturing method thereof, belonging to a composite shear wall and a manufacturing method thereof.

Background technique

In recent years, the steel-concrete composite shear wall structure has been widely used in engineering and has been well received by the engineering community. However, the cohesive force between steel and concrete is small, and slip damage is prone to occur, which affects the full play of the overall seismic performance of the structure. How to make concrete medium-section steel fully play its role to improve the comprehensive seismic performance of steel shear walls has become a key technical issue.

Among the existing schemes for improving the seismic performance of steel shear walls, there is the technology of adding hidden reinforcements to reinforced concrete shear walls. The existing problem is: the core part of the oblique hidden support is concrete, and the tensile and compressive capacity is not enough.

Among the existing schemes for improving the seismic performance of steel shear walls, there is another technology of adding steel plate supports. The existing problems are: the mechanical performance of the steel plate is weaker than that of other section steel, the tensile and compressive resistance is insufficient, and the support end is prone to local instability.

Among the existing schemes for improving the seismic performance of shear walls, there is also the technology of adding centrally supported steel trusses to reinforced concrete shear walls. The existing problems are: the connection between the support and the steel beam-column node causes the node to bear a large force, and it is easy to cause the node to be damaged before the component, which does not conform to the seismic design principle of the strong node; when multiple supports are at the same node at the same time, The construction of nodes is difficult, and it is difficult to guarantee the construction quality.

Contents of the invention

The technical problem to be solved by the invention is to significantly improve the seismic capacity of the steel-concrete composite shear wall. In order to solve this problem, the present invention proposes a manufacturing method of a steel truss composite shear wall with built-in eccentric support, and a steel truss composite shear wall with built-in eccentric support designed according to the method.

The manufacturing method of the built-in eccentric support steel truss concrete composite shear wall adopted in the present invention, its sequence is as follows:

1) Configure the section steel and steel bars in the frame column;

2) Configure the shaped steel and steel bars in the frame beam, and consolidate the shaped steel beam and shaped steel column;

3) Concealed shaped steel supports are configured, and the upper and lower ends are respectively fixed with the shaped steel in the frame beam, forming a steel truss together with shaped steel columns and shaped steel beams;

4) Configure the hidden support of steel bars and support stirrups;

5) Configure fixed reinforcement;

6) Configure the distributed reinforcement of the shear wall;

7) Reinforce the frame and wall panels of the built-in steel trusses and shear walls, and form them into a concrete composite shear wall with built-in eccentrically supported steel trusses by pouring and tamping concrete at one time.

When configuring the concealed steel support, the upper end of the concealed steel support extends into the middle or end of the upper frame beam, and the lower end extends into the end of the lower frame beam, so that the concealed steel support and the frame beam-column node form an eccentric connection. The section between the intersection point of the eccentric support and the steel beam to the column forms an energy dissipation beam section in the earthquake resistance.

When configuring shaped steel beams, shaped steel columns, and shaped steel concealed supports, the design bearing capacity should meet the requirements of strong columns, strong braces, and weak energy-dissipating beams. The shear yields, and the remaining sections are still in the unyielded stress state.

When configuring the steel bar concealed support, four steel bars surround the steel bar concealed support to form a steel bar concealed support. The steel bar concealed support bypasses the profile steel beam in the frame beam for anchorage, and the stirrups are fixed and distributed outside the steel bar support. When pouring shear wall concrete Confined concrete bundles are then formed.

The method of configuring the fixed reinforcement is to configure the fixed reinforcement at the node where the hidden support and the frame intersect.

According to the method of the present invention, the technical solution adopted is: the built-in eccentrically supported steel truss concrete composite shear wall is composed of a frame and a shear wall panel, and a reinforcement mesh composed of horizontally and vertically distributed steel bars is configured in the shear wall panel, Tension reinforcement 13 is used between the reinforcement meshes, which is characterized in that: the eccentric support steel truss 1 is hidden in the shear wall, and the steel truss 1 is composed of section steel columns 4, section steel beams 5 and section steel concealed supports 10, and the design bearing capacity The requirements for strong columns, strong braces, and weak energy-dissipating beam sections should be met. With the increase of earthquake action, the energy-dissipating beam section in the shaped steel beam first reaches shear yield, and the rest of the sections are still in the unyielded stress state. The shaped steel columns 4 are hidden in the frames at both ends of the shear wall, the shaped steel beams 5 are hidden in the frame beams of the shear wall, the shaped steel hidden supports 10 are connected with the middle steel beams 5 in the frame at the upper and lower ends, and there are distributed around the shaped steel hidden supports 10 Concealed steel support 17, which bypasses the medium-sized steel beam 5 of the frame for anchoring, and forms an eccentrically supported steel truss 1 with strong columns, strong braces, and weak energy dissipation beam sections inside the concrete shear wall.

The length of the energy dissipation beam section should not be too large to ensure that the energy dissipation beam section forms a shear yield type energy dissipation beam section; the length of the energy dissipation beam section should not be too small to avoid premature plastic deformation due to excessive plastic deformation angle. out of shape. The length a of the energy dissipation beam section satisfies the following relationship:

_{hb≤a≤1.5hb _}

In the formula: a-the length of the energy dissipation beam section, that is, the distance from the intersection point of the profiled steel support and the profiled steel beam to the profiled steel column surface;

h _b - section height of section steel energy dissipating beam

The concrete composite shear wall with built-in steel truss is characterized in that: the hidden steel support 10 and the hidden steel support 17 in the hidden steel truss 1 are in the shape of a herringbone, and its upper end extends into the upper frame beam and the middle steel beam 5 of the beam. The middle point is connected, and the lower end extends into the end of the lower frame beam 5, and is connected with the medium-sized steel beam 5 of the lower frame beam, and the profiled steel concealed support 10 and steel bar concealed support 17, the profiled steel beam 5 and the profiled steel column 4 at both ends of the shear wall are combined. An eccentrically supported steel truss 1 that forms strong columns, strong braces, and weak energy-dissipating beam sections inside the concrete shear wall.

The concrete composite shear wall with built-in steel truss is characterized in that: the concealed steel support 10 and concealed steel support 17 in the hidden steel truss 1 are X-shaped, and the upper end thereof extends into the end of the upper frame beam, and is connected with the upper frame The beam is connected with the medium-sized steel beam 5, and the lower end extends into the end of the lower frame beam to connect with the medium-sized steel beam 5 of the lower frame beam. Steel beams 5 are combined to form eccentrically supported steel trusses 1 with strong columns, strong braces and weak energy dissipation beam sections inside the concrete shear walls.

The concrete composite shear wall with built-in steel truss is characterized in that: the hidden steel support 10 and the hidden steel support 17 in the hidden steel truss 1 are in the shape of a figure-eight, the upper end of which is connected with the medium-sized steel beam 5 of the beam, and the lower end extends into the lower The end of the frame beam is connected with the medium-sized steel beam 5 of the lower frame beam, the hidden steel support 10 and the hidden steel support 17, the steel beam 5 in the frame beam and the steel column 4 at both ends of the shear wall are combined, and the concrete shear wall A steel truss 1 with strong columns, strong supports and weak energy dissipation beam sections is formed inside.

The concrete composite shear wall with built-in steel truss is characterized in that: the concealed steel support 10 and concealed steel support 17 in the concealed steel truss 1 are single-slope bars, the upper end of which is connected to the beam medium-sized steel beam 5, and the lower end extends into The end of the lower frame beam is connected with the medium-sized steel beam 5 of the lower frame beam, the hidden steel support 10 and the hidden steel support 17, the steel beam 5 in the frame beam and the steel column 4 at both ends of the shear wall are combined. A steel truss 1 with strong columns, strong supports and weak energy dissipation beams is formed inside the wall.

The built-in truss shear wall of the present invention is suitable for the shear wall with concrete wall panels as the first line of defense against earthquakes. When the wall panels are damaged during earthquake resistance, the hidden supports and frame beams form trusses to maintain the overall stability of the structure. When the seismic force continues to increase, yielding and plastic deformation occur in the eccentric section of the eccentric support, that is, the energy-dissipating beam section, to consume the seismic energy input into the structure.

The built-in truss structure of the present invention is a system of strong columns, strong braces, and weak energy-dissipating beam sections. The design bearing capacity of hidden supports and shaped steel columns is higher than the corresponding bearing capacity when the energy-dissipating beam section yields. When the energy-dissipating beam When the section yields and plastically deforms, the remaining sections of the shaped steel beam, concealed supports, and shaped steel columns are still in the unyielding stage.

In the built-in truss of the present invention, the hidden support is composed of steel hidden support, steel bar hidden support, supporting stirrup, and restrained concrete, which improves the bearing capacity of the structure, and at the same time ensures that the truss still has energy-dissipating beam section yield and plastic deformation. Relatively stable hysteretic performance improves the ductility of the structure.

The invention reduces the degree of sliding damage of section steel in concrete. Since the shaped steel truss itself forms a geometrically invariant force transmission system, the bond force between the shaped steel and the concrete does not play a major role in the force transmission during the joint work of the concrete and the shaped steel, and bond failure is not easy to occur; In the hidden support formed together with the steel support, the steel support bypasses the shaped steel beam for anchoring, which greatly enhances the bonding effect between the shaped steel hidden support and the concrete.

The present invention is formed by the combination of built-in eccentrically supported steel trusses and concrete shear walls. The formation process is the process of adding the two, but the seismic capacity of the combined structure is significantly higher than the addition of steel trusses and shear walls working independently. The reason is that the combined structure treatment has brought into play the respective advantages of the two, and effectively made up for the deficiencies of the two in earthquake resistance. For the concrete wall, the built-in steel truss can significantly increase its bearing capacity, improve ductility, increase the building usable area and save construction costs without changing the external dimensions. For the steel truss hidden in the shear wall, the section steel member is restrained by the reinforced concrete beam, which is not easy to be damaged by instability, and the bearing capacity and ductility are improved. In addition, after the plastic deformation of the ordinary eccentrically supported steel truss in the mid-seismic energy-dissipating beam section, it is easy to cause damage to the floor, and it is difficult to repair after a moderate earthquake. However, the first anti-seismic defense line of the present invention is a shear wall, and the energy-dissipating beam section is used as a combination The structure's second line of seismic defense succumbed in a major earthquake. Compared with composite structures such as shear walls with concealed support of steel plates, steel shear walls with concealed supports of reinforced concrete, and concrete composite shear walls with concealed central support and concealed trusses, the present invention has improved bearing capacity, slow decay of bearing capacity and stiffness, and a later stage The seismic performance is relatively stable, and the bottom shear slip damage is reduced.

Since the steel shear wall is the core anti-lateral force component of the building structure, the seismic capacity of the steel shear wall is improved, and the overall seismic capacity of the steel shear wall structure is improved. When the building encounters a strong earthquake, it can reduce its Earthquake damage, prevent it from collapsing.

Description of drawings

Fig. 1 is a schematic diagram of structural reinforcement of a structural unit of the shear wall when the medium-sized steel concealed support of the present invention's built-in eccentrically supported steel truss concrete composite shear wall and the concealed support of the steel bar are herringbone;

Fig. 2 is the enlarged schematic view of A-A section in Fig. 1;

Fig. 3 is the enlarged schematic view of B-B section in Fig. 1;

Fig. 4 is a schematic diagram of structural reinforcement of a structural unit of the shear wall when the medium-sized steel concealed support of the present invention has a built-in eccentric support steel truss concrete composite shear wall and the concealed support of the steel bar is X-shaped;

Fig. 5 is a schematic diagram of structural reinforcement of a structural unit of the shear wall when the medium-sized steel concealed support of the present invention has a built-in eccentric support steel truss concrete composite shear wall and the concealed support of the steel bar is in a figure-eight shape;

Fig. 6 is a schematic diagram of structural reinforcement of a structural unit of the shear wall when the medium-sized steel concealed support of the present invention's built-in eccentrically supported steel truss concrete composite shear wall and the concealed support of the steel bar are single inclined bars;

Fig. 7 is a schematic diagram of the structural reinforcement of a structural unit of the shear wall when the medium-sized steel concealed support and the reinforced steel concealed support of the present invention are arranged in a herringbone network shape in the steel truss concrete composite shear wall;

Fig. 8 is a schematic diagram of the structural reinforcement of a structural unit of the shear wall when the medium-sized steel concealed support and the reinforced steel concealed support of the present invention are arranged in an X-shaped network in a composite shear wall with eccentrically supported steel trusses;

Fig. 9 is a schematic diagram of the structural reinforcement of a structural unit of the shear wall when the medium-sized steel concealed support and the reinforced steel concealed support of the present invention are arranged in a figure-eight-shaped network;

In the figure, 1-steel truss 2-frame column reinforcement 3-frame column stirrup 4-type steel column 5-type steel beam 6-frame beam reinforcement 7-frame beam stirrup 8-shear wall panel transverse reinforcement 9-shear Vertical reinforcement of force wall wall panel 10-shaped steel concealed support 17-steel concealed support 18-concealed support stirrup.

Detailed ways

Below in conjunction with accompanying drawing 1, Fig. 2 and Fig. 3, specifically illustrate the embodiment of the present invention:

Example 1

How to make a shear wall:

1) Configure the profile steel column 4, longitudinal reinforcement bar 2, and column stirrup bar 3 in the frame column;

2) Configure the shaped steel beam 5, the beam longitudinal reinforcement bar 6, and the stirrup 7 in the frame beam, and the shaped steel beam 5 and the shaped steel column 4 are consolidated;

3) Concealed shaped steel supports 17 are configured, and the upper and lower ends are respectively fixed with shaped steel beams 5 in the frame beams to form eccentric supports, which together form steel trusses 1 with shaped steel columns 4 and shaped steel beams 5;

4) Concealed steel bar support 17 and support stirrup 18 are configured, and the steel bar concealed support 17 bypasses the shaped steel beam 5 for anchoring;

5) configuring the first fastening rib 11 and the second fastening rib 12;

6) Configure the horizontally distributed reinforcing bars 8 and longitudinally distributed reinforcing bars 9 of the shear wall;

7) Reinforce the frame and wall panels of the built-in steel trusses and shear walls, and form them into a concrete composite shear wall with built-in eccentrically supported steel trusses by pouring and tamping concrete at one time.

The structural reinforcement diagram of a structural unit of the concrete composite shear wall with built-in eccentrically braced steel truss is shown in Fig. 1, Fig. 2 and Fig. 3. Concrete shear wall panel combination with steel bar hidden support 17 is formed. The shaped steel in the frame column with regular quadrilateral cross section hides the I-shaped steel column 4, and the reinforcement is two steel bars 2 on each side, and the quadrilateral stirrups 3 are bound along the longitudinal bars of the column, and the stirrups are distributed to connect the beam and the column. The area inside the node connected; the shaped steel beam of the rectangular cross-section frame beam is I-shaped steel 5, and the reinforcement is two longitudinal reinforcements 6 at equal distances on each side, and rectangular stirrups 7 are bound along the longitudinal reinforcement of the beam, and the frame The stirrups of the beam are distributed to the beam end; the reinforcement of the shear wall is to arrange the transverse reinforcement 8 and the vertical reinforcement 9 of the shear wall panel evenly along the horizontal and vertical directions on both sides, and bind and fix them at the intersection points to form Two pieces of reinforcement mesh, the two ends of the horizontal reinforcement 8 and the vertical reinforcement 9 are respectively inserted into the frame column and the frame beam, and make them meet the requirements of the anchorage length respectively. Four steel bars surround the steel bar support 10 to form a steel bar concealed support 17, and the steel bar concealed support 17 is anchored around the profiled steel beam in the frame beam, and the outside of the steel bar concealed support 17 is evenly equipped with stirrup bars 18. The upper end of the concealed steel support 10 extends into the upper frame beam to connect with the beam medium steel 5, and its lower end extends into the end of the lower frame beam to connect with the lower frame beam medium steel beam 5 to form a built-in steel truss 1. Four steel bars are anchored around the shaped steel beam 5 . Other structural reinforcements include fixing the first reinforcement bars 11 and the second reinforcement bars 12 at the joints where the hidden supports intersect with the frame beams. The two steel meshes of the shear wall are connected by tension bars 13 with a spacing less than or equal to 600mm. Finally, the frame and wall panel reinforcement of the built-in steel truss and shear wall are formed into a concrete composite shear wall with a built-in eccentrically supported steel truss by pouring and tamping concrete at one time.

Example 2

The second structural form of the steel truss composite shear wall with built-in eccentric support is shown in Figure 4. The hidden steel support 10 and the hidden steel support 17 of the hidden steel truss are X-shaped, and their upper ends extend into the end of the upper frame beam , connected with the medium-sized steel beam 5 of the upper frame beam. The lower end extends into the end of the lower frame beam, and is connected with the medium-sized steel beam 5 of the lower frame beam. The third fixing rib 14 and the fourth fixing rib 15 are respectively fixed at the node where the hidden support intersects with the frame beam, and the other aspects are the same as the first form.

Example 3

The third structural form of the steel truss concrete composite shear wall with built-in eccentric support is shown in Fig. 5. The eight-shaped hidden steel support 10 and the hidden steel support 17 are arranged on the inside of the two steel meshes of the shear wall panel. The upper frame beam is connected with the middle-sized steel beam 5 of the beam, and its lower end stretches into the end of the lower frame beam, and is connected with the middle-sized steel beam 5 of the lower frame beam. The fifth fixing rib 11 and the sixth fixing rib 16 are respectively fixed at the node where the hidden support intersects with the frame beam, and the other aspects are the same as the first form.

Example 4

The fourth structural form of the steel truss composite shear wall with built-in eccentric support is shown in Figure 6. The concealed steel support 10 and the concealed steel support 17 in the hidden steel truss 1 are single-slope bars, and the upper end is connected with the medium-sized steel beam of the beam. 5 connection, the lower end extends into the end of the lower frame beam, and is connected with the medium-sized steel beam 5 of the lower frame beam, and the third fixing rib 14 and the fourth fixing rib 15 are respectively fixed at the node where the hidden support and the frame beam intersect, Other aspects are the same as the first form.

Embodiment 5, 6, 7

The fifth, sixth, and seventh structural forms of steel truss concrete composite shear walls with built-in eccentric support are shown in Figure 7, Figure 8, and Figure 9 respectively. When the height of the floor is smaller than the width of the shear wall, the inner One of the above three methods can be selected for the hidden steel truss to control the angle of the hidden support between 45 degrees and 60 degrees, and the other structures are the same as the first method.

Example 2 is a combination of ordinary shear walls and eccentrically supported steel trusses. The seismic performance of the eccentrically supported steel truss-concrete composite shear walls formed after the combination is significantly higher than that of ordinary shear walls and eccentrically supported steel trusses. Addition of independent work. On the one hand, it improves the bearing capacity, stiffness and ductility of the concrete wall panels, on the other hand, it reduces the possibility of steel truss instability, and the hidden support of steel bars improves the bond between steel and concrete. The seismic performance of Example 2 and the reinforced concrete shear wall and steel truss before the combination is compared through three model components.

1) Model design

Three model components are designed, the model scale is 1:3, component 1 is a steel frame with X-shaped I-beam eccentric support, the span is 1000 mm, and the height is 1500 mm, which is recorded as SBF; component 2 is an ordinary concrete shear wall , a shear wall with a straight section, a wall panel width of 1000mm, a height of 1500mm, and a thickness of 150mm, denoted as SW-1000; component 3 is a steel truss composite shear wall with built-in eccentric support, and the wall of component 2 The I-shaped steel frame SBF is embedded in the board, and the construction method is the same as that in the second embodiment, which is recorded as SBW-ST. Reinforcement and structural requirements refer to the concrete structure design specification, building seismic design specification, technical specification for steel-concrete composite structure and the research results of reinforced concrete with concealed support wall. The dimensions and reinforcement of each specimen are shown in Table 1. The design strength grade of the shear wall concrete with a wall panel width of 1000mm is C40.

The relationship between the three components is: component 1 contains component 2, and steel concealed supports and stirrups are arranged around the section steel concealed supports to form a combined concealed support, constituting component 3.

Table 1 Design parameters of three shear wall specimens with a section height of 1000mm

Specimen No. SBF SW-1000 SBW-ST Specimen Description  Steel frame with X-shaped eccentric supports Ordinary concrete shear wall   Built-in eccentrically supported steel truss concrete composite shear wall Specimen Width (mm) 1000 1000 1000 Specimen Thickness (mm) 80 150 150 Clear height of test piece (mm) 1500 1500 1500 Wall panel horizontal distribution bars none  φ6@75  φ6@75 Vertical distribution bars of wall panels none  φ6@70  φ6@70 Side column section b×h(mm) none 150×170 150×170 Side column height(mm) none 1500 1500 Side column main reinforcement none 6φ8 6φ8 side column stirrup none φ4@70 φ4@70

side column steel I-beam (fy＝215Ass＝650mm ² ) none I-beam (fy＝215Ass＝650mm ² ) steel beam I-beam (fy＝215Ass＝500mm ² ) none I-beam (fy＝215Ass＝500mm ² ) support Cross I-beam (fy＝215Ass＝600mm ² ) none Cross I-beam (fy=215Ass=600mm ² ) and 412 supporting stirrups none none φ4@50 Energy dissipation beam length 120 none 120

2) Bearing capacity

The cracking load, apparent yield load and ultimate load of each member are shown in Table 2.

Table 2 Cracking load, apparent yield load and ultimate load of each specimen

  Test piece number F _c /kN F _y /kN F _u /kN SBF 45.67 67.59 SW-1000 161.56 296.99 315.21 SBW-ST 220.62 706.13 840.85.

In Table 2: F _c is the horizontal load of cracking of the concrete wall; F _y is the horizontal load of the apparent yield of the specimen; F _u is the maximum horizontal load of the specimen;

Analyzing Table 2, it can be seen that:

(1) The cracking load, apparent yield load, and ultimate load of the steel truss concrete composite shear wall with built-in eccentric support are all higher than those of the ordinary shear wall. Compared with the wall SW-1000, the cracking load of SBW-ST increased by 36.56%; the yield load increased by 137.76%; the ultimate load increased by 166.75%.

The sum of the yield load of wall SW-1000 and SBF is 342.66kN, compared with that, the yield load of SBW-ST is increased by 106.07%;

The sum of the ultimate load of wall SW-1000 and SBF is 382.8kN, compared with that, the ultimate load of SBW-ST is increased by 119.66%.

(2) The ratio of the cracking load to the ultimate load of the steel truss concrete composite shear wall with built-in eccentric support is significantly smaller than that of the ordinary shear wall, indicating that the specimen has a relatively long course from cracking to the ultimate load, which is beneficial to earthquake resistance.

(3) The ratio of the yield load to the ultimate load (yield strength ratio) of the steel truss concrete composite shear wall with built-in eccentric support is significantly smaller than that of the ordinary shear wall, indicating that the yield section of the specimen from yield to ultimate load is constrained is longer , beneficial to earthquake resistance.

3) Rigidity

Since the main purpose of the present invention is to improve the seismic performance of the shear walls, only the stiffness and attenuation coefficients of each shear wall are compared here, and the stiffness of each shear wall and the stiffness attenuation coefficients of each stage are shown in Table 3

Table 3 Stiffness of specimens at each stage

Specimen No. K ₀ (KN/mm) K _c (KN/mm) K _y (KN/mm) β _c0 β _yc β _y0 β _y0 relative value SW-1000 258.68 140.49 25.60 0.543 0.182 0.099 1.000 SBW-ST 270.24 242.44 55.17 0.897 0.227 0.204 2.062

In the table: K ₀ is the initial elastic stiffness of the specimen; K _c is the cracking secant stiffness of the specimen; K _y is the apparent yield secant stiffness of the specimen; β _c0 = K _c /K ₀ is the ratio of the cracking stiffness to the initial stiffness, It represents the attenuation of stiffness from initial elasticity to cracking; β _y0 =K _y /K ₀ is the ratio of yield stiffness to initial stiffness, which indicates the attenuation of stiffness from initial stage to yield; β _yc =K _y /K _c is the ratio of yield stiffness to crack stiffness, which represents the attenuation from crack to yield stiffness; the relative value of β _y0 indicates the ratio of β _y0 of the steel truss concrete composite shear wall with built-in eccentric support to its corresponding ordinary shear wall β _y0 . It can be seen from Table 3:

(1) The initial elastic stiffness of the two shear walls is very close, indicating that the initial stiffness is mainly determined by the strength of the concrete and the size of the specimen.

(2) The yield stiffness of concrete composite shear walls with eccentrically braced steel trusses is significantly higher than that of ordinary concrete shear walls, indicating that the stiffness attenuation rate of concrete composite shear walls with eccentrically The truss forms an effective constraint on the cracking of the concrete, which is conducive to stabilizing the stiffness of the structure in the later stage and improving the seismic capacity of the structure in the later stage.

(3) The β _yc of the steel truss concrete composite shear wall with built-in eccentric support is significantly higher than that of the corresponding ordinary concrete shear wall, which is due to the increase in yield stiffness is greater than the increase in crack stiffness. The β _y0 value of the steel truss composite shear wall with built-in eccentric support is significantly higher than that of the ordinary concrete shear wall, which is the result of a significant increase in the yield stiffness of the steel truss composite shear wall with built-in eccentric support because its initial stiffness is close to that of the concrete composite shear wall.

4) Ductility performance analysis

Only the displacement and ductility coefficient of each shear wall are compared, and the displacement and ductility coefficient of each shear wall are shown in Table 4.

Table 4 The measured values of displacement and ductility coefficient of each shear wall

Specimen No. U _c /mm U _y /mm U _d /mm Relative value of U _d θ _p mu Relative value of μ SW-1000 1.15 11.60 51.35 1.000 1/29 4.427 1.000 SBW-ST 0.91 12.80 62.43 1.216 1/24 5.604 1.266

The displacements in the table refer to the positive and negative mean values of the corresponding horizontal displacements at the same height as the horizontal loading point. Among them: U _c is the cracking displacement corresponding to F _c ; U _y is the yield displacement corresponding to F _y ; U _d is the maximum elastic-plastic displacement; μ=U _d /U _y is the ductility coefficient; θ _p is the elastic-plastic displacement angle .

It can be seen from Table 4:

(1) The elastic-plastic maximum displacement of the steel truss concrete composite shear wall with built-in eccentric support is significantly higher than that of the ordinary concrete shear wall, and the maximum elastic-plastic displacement increases by 21.6%.

(2) The ductility coefficient of the concrete composite shear wall specimen with built-in eccentric support steel truss is significantly higher than that of the ordinary concrete shear wall, and the ratio is 26.6%.

(3) The elastic-plastic displacement angle of SBW-ST reaches 1/24, which can meet the requirements of large earthquakes on component deformation, and is larger than the elastic-plastic displacement angle of ordinary concrete shear walls.

Conclusion: The analysis results show that the bearing capacity of the concrete composite shear wall with built-in eccentric support steel truss is significantly improved, which is much higher than the sum of the bearing capacity of the ordinary concrete shear wall and the I-steel frame. At the same time, its yield ratio, post stiffness , ductility coefficient, and elastic-plastic displacement are significantly improved on the basis of ordinary concrete shear walls, and the seismic capacity is significantly improved.

Claims (8)

1. A method of manufacturing a steel truss concrete composite shear wall with built-in eccentric support, which is a method of manufacturing a shear wall, characterized in that the sequence of making is as follows: 1) Configure the section steel and steel bars in the frame column; 2) Configure the shaped steel and steel bars in the frame beam, and consolidate the shaped steel beam and shaped steel column; 3) Concealed shaped steel supports are configured, and the upper and lower ends are respectively fixed with the shaped steel in the frame beam, forming a steel truss together with shaped steel columns and shaped steel beams; 4) Configure the hidden support of steel bars and support stirrups; 5) Configure fixed reinforcement; 6) Configure the distributed reinforcement of the shear wall; 7) Reinforce the frame and wall panels of the built-in steel trusses and shear walls, and form them into a concrete composite shear wall with built-in eccentrically supported steel trusses by pouring and tamping concrete at one time; When configuring the profiled steel concealed support, the upper end of the profiled steel concealed support extends into the middle or end of the upper frame beam, and the lower end extends into the end of the lower frame beam, so that the profiled steel concealed support forms an eccentric connection with the medium steel of the frame beam; the eccentric support and the profiled steel beam Sections between intersections and columns, forming energy-dissipating beam sections in seismic resistance; When configuring shaped steel beams, shaped steel columns and shaped steel concealed supports, the design bearing capacity meets the requirements of strong columns, strong braces, and weak energy dissipation beam sections; When configuring the fixed reinforcement, configure the fixed reinforcement at the node where the hidden support and the frame intersect. 2. The manufacturing method of a steel truss concrete composite shear wall with built-in eccentric support according to claim 1, characterized in that: when configuring the hidden support of steel bars, four steel bars surround the hidden support of profiled steel to form a hidden support of steel bars, and the steel bars The concealed support is anchored around the steel beam in the frame beam, and the stirrups are fixed and distributed outside the steel support. When the shear wall concrete is poured, the restrained concrete bundle is formed. 3. The built-in eccentrically supported steel truss concrete composite shear wall designed according to the method of claim 1 is composed of a frame and a shear wall panel, and a reinforcement mesh composed of horizontally and vertically distributed steel bars is arranged in the shear wall panel , between the reinforcement meshes, the steel bars (13) are used for tensioning, and it is characterized in that: the eccentric support steel truss (1) is hidden in the shear wall, and the steel truss (1) is composed of a steel column (4), a steel beam (5 ) and concealed steel supports (10), the design bearing capacity should meet the requirements of strong columns, strong braces, and weak energy-dissipating beams; the steel columns (4) are hidden in the frame at both ends of the shear wall, Hidden in the frame beam of the shear wall, the profile steel concealed support (10) is connected with the frame medium steel beam (5) at the upper and lower ends, and there are reinforced steel concealed supports (17) distributed around the profiled steel concealed support (10), and the reinforced steel concealed support ( 17) The medium-sized steel beam (5) of the frame is bypassed for anchoring, and an eccentrically supported steel truss (1) of strong columns, strong braces, and weak energy dissipation beam sections is formed inside the concrete shear wall. 4. According to claim 3, the built-in steel truss concrete composite shear wall is characterized in that: the length of the energy dissipation beam section satisfies the following relationship: _{hb≤a≤1.5hb _} In the formula, a-the length of the energy dissipation beam section, that is, the distance from the intersection point of the steel support and the steel beam to the surface of the steel column; h _b - section height of section steel energy dissipating beam segment. 5. The concrete composite shear wall with built-in steel truss according to claim 3, characterized in that: the hidden steel support (10) and hidden steel support (17) in the hidden steel truss (1) are herringbone-shaped, and the upper end Extending into the upper frame beam to connect with the middle point of the beam medium-sized steel beam (5), the lower end extends into the end of the lower frame beam (5) to connect with the lower frame beam medium-sized steel beam (5), and the profiled steel concealed support (10) and Concealed steel support (17), shaped steel beam (5) and shaped steel columns (4) at both ends of the shear wall are combined to form an eccentrically supported steel truss ( 1). 6. The concrete composite shear wall with built-in steel truss according to claim 3, characterized in that: the hidden steel support (10) and hidden steel support (17) in the hidden steel truss (1) are X-shaped, and the upper end It extends into the end of the upper frame beam and connects with the medium-sized steel beam (5) of the upper frame beam, and the end of the lower end extends into the lower frame beam to connect with the medium-sized steel beam (5) of the lower frame beam. The combination of concealed support (17), section steel column (4) at both ends of the shear wall and section steel beam (5) in the frame beam forms eccentric support of strong column, strong brace, and weak energy dissipation beam section inside the concrete shear wall Steel Truss (1). 7. The concrete composite shear wall with built-in steel truss according to claim 3, characterized in that: the hidden steel support (10) and hidden steel support (17) in the hidden steel truss (1) are in a figure-eight shape, and the upper end It extends into the upper frame beam and is connected with the medium-sized steel beam (5) of the upper frame beam, and the lower end extends into the end of the lower frame beam and is connected with the medium-sized steel beam (5) of the lower frame beam. The support (17), the profiled steel beam (5) in the frame beam and the profiled steel column (4) at both ends of the shear wall are combined to form a steel truss (1) of strong column, strong brace, and weak energy dissipation beam section inside the concrete shear wall. 8. The concrete composite shear wall with built-in steel truss according to claim 3, characterized in that: the concealed profile steel support (10) and concealed reinforcement support (17) in the concealed steel truss (1) are single inclined bars, and The upper end extends into the upper frame beam and is connected with the beam medium-sized steel beam (5), the lower end extends into the end of the lower frame beam, and is connected with the lower frame beam medium-sized steel beam (5), and the shaped steel concealed support (10) and steel bar concealed support (17), the steel beam (5) in the frame beam and the steel column (4) at both ends of the shear wall are combined to form a steel truss (1) of strong column, strong brace, and weak energy dissipation beam section inside the concrete shear wall.

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