CN113293928A - Oblique crossing beam structure and building applying same - Google Patents
Oblique crossing beam structure and building applying same Download PDFInfo
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- CN113293928A CN113293928A CN202110571431.3A CN202110571431A CN113293928A CN 113293928 A CN113293928 A CN 113293928A CN 202110571431 A CN202110571431 A CN 202110571431A CN 113293928 A CN113293928 A CN 113293928A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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Abstract
The embodiment of the application provides a diagonal beam structure and applied this diagonal beam structure's building, wherein, diagonal beam structure includes: the main beam and the secondary beam form an acute angle; the girder includes: the main beam longitudinal ribs and the main beam stirrups connected between the main beam longitudinal ribs; the secondary beam includes: the secondary beam longitudinal reinforcements, the first secondary beam stirrups and the second secondary beam stirrups; the first secondary beam stirrups are positioned at two ends of the secondary beam and are vertically connected with the longitudinal bars of the secondary beam; the second secondary beam stirrup is positioned at the joint of the primary beam and the secondary beam and is arranged perpendicular to the secondary beam longitudinal bar; the second secondary beam stirrup is connected with the secondary beam longitudinal rib or the main beam longitudinal rib positioned at the outermost side; the length of the second beam stirrup is smaller than that of the first beam stirrup. The skew beam structure and the building using the skew beam structure provided by the embodiment of the application can improve the strength and the shearing resistance of the skew beam.
Description
Technical Field
The application relates to a diagonal beam node structure technology, in particular to a diagonal beam structure and a building applying the same.
Background
The oblique crossing beam is a beam body structure which is common in irregular buildings, and the included angle between a main beam and a secondary beam is less than 90 degrees, so that the following problems are brought about:
1. the main beam and the secondary beam have a large stress concentration at the acute angle of the intersection node.
2. The stirrups of the secondary beam cannot be arranged in parallel at the node.
3. The shear stress at the intersection of the primary and secondary beams increases.
4. The tensile and compressive stress of the main beam at the intersection node of the main beam and the secondary beam is increased.
The presence of the above-mentioned problems may reduce the safety of the skew beam.
For the above-mentioned point 2 defect, the following solutions exist in the related art: the standard construction diagram set provides a way of adjusting the arrangement mode of the stirrups, increasing the widths of the stirrups, obliquely arranging the stirrups, and reducing the distance between the stirrups on one side under the condition of ensuring the distance of 200mm between the stirrups on the other side. Fig. 1 is a schematic structural view of a cross beam in the related art. As shown in fig. 1, the primary beam 1 and the secondary beam 2 intersect at an angle of less than 90 °. The main beam 1 comprises a main beam longitudinal rib 11 and a main beam stirrup 12, and the main beam stirrup 12 is perpendicular to the main beam longitudinal rib 11. The secondary beam 2 includes a secondary beam longitudinal rib 21 and a secondary beam stirrup 22. The secondary beam stirrups 22 located at the end parts of the secondary beams 2 are perpendicular to the secondary beam longitudinal bars 21, the secondary beam stirrups 22 located at the nodes are obliquely arranged, specifically, the distances of the same ends of the secondary beam stirrups 22 located at the nodes are equal, and the distance of the other ends of the secondary beam stirrups is reduced. When the width of roof beam is great, above-mentioned solution can lead to the interval of stirrup to diminish, can appear the stirrup mutual interference even and play the problem of putting up, has seriously influenced pouring and vibrating of concrete, has reduced the reliability of node, and then has reduced the security.
Disclosure of Invention
In order to solve one of the above technical drawbacks, embodiments of the present application provide a diagonal beam structure and a building using the same.
According to a first aspect of embodiments of the present application, there is provided a skew beam structure including: the main beam and the secondary beam form an acute angle;
the girder includes: the main beam longitudinal ribs and the main beam stirrups connected between the main beam longitudinal ribs;
the secondary beam includes: the secondary beam longitudinal reinforcements, the first secondary beam stirrups and the second secondary beam stirrups; the first secondary beam stirrups are positioned at two ends of the secondary beam and are vertically connected with the longitudinal bars of the secondary beam; the second secondary beam stirrup is positioned at the joint of the primary beam and the secondary beam and is arranged perpendicular to the secondary beam longitudinal bar; the second secondary beam stirrup is connected with the secondary beam longitudinal rib or the main beam longitudinal rib positioned at the outermost side; the length of the second beam stirrup is smaller than that of the first beam stirrup.
According to a second aspect of embodiments of the present application, there is provided a building comprising: a cross-member structure as claimed in any one of claims 1 to 10.
The technical scheme that this application embodiment provided, the contained angle between girder and the secondary beam is the acute angle, and the secondary beam includes: the beam comprises secondary beam longitudinal ribs, first secondary beam stirrups and second secondary beam stirrups, wherein the first secondary beam stirrups are positioned at two ends of the secondary beam and are vertically connected with the secondary beam longitudinal ribs; the second secondary beam stirrup is positioned at the joint of the primary beam and the secondary beam and is arranged perpendicular to the secondary beam longitudinal bar; the second secondary beam stirrup is connected with the secondary beam longitudinal rib or the main beam longitudinal rib positioned at the outermost side in the main beam; the length of the beam stirrup of the second time is less than that of the beam stirrup of the first time, so that the problem that mutual interference of reinforcing steel bars is caused in the traditional scheme due to the reduction of the distance between the longitudinal beam stirrups and even concrete pouring and vibrating are influenced is solved, and the reliability and the application safety of the diagonal beam node are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural view of a cross beam in the related art;
fig. 2 is a schematic structural diagram of an oblique beam according to an embodiment of the present disclosure;
FIG. 3 is a cross-sectional view of the connection structure of the second secondary beam stirrup in the skew beam shown in FIG. 2;
FIG. 4 is a schematic structural diagram of another skew beam provided in the embodiments of the present application;
FIG. 5 is a cross-sectional view of the connection structure of the second secondary beam stirrup in the skew beam shown in FIG. 3;
FIG. 6 is a schematic external view of a cross beam according to an embodiment of the present disclosure;
fig. 7 is a schematic configuration diagram of a main beam stirrup in a skew beam according to an embodiment of the present disclosure;
FIG. 8 is a schematic view of a second secondary beam stirrup configuration in a cross beam according to an embodiment of the present disclosure;
fig. 9 is a schematic configuration view of a longitudinal bar of a secondary beam in an oblique beam according to an embodiment of the present application.
Reference numerals:
1-a main beam; 11-main beam longitudinal ribs; 12-main beam hooping;
2-secondary beam; 21-secondary beam longitudinal ribs; 22-secondary beam stirrups; 23-first secondary beam stirrups; 24-a second secondary beam stirrup; 25-axillary reinforcement bar connecting ribs;
3-axillary region; 31-main beam connection section; 32-secondary beam connection section; 33-middle section.
Detailed Description
In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Fig. 2 is a schematic structural view of an oblique crossing beam provided in an embodiment of the present application, fig. 3 is a cross-sectional view of a connection structure of a second secondary beam stirrup in the oblique crossing beam shown in fig. 2, fig. 4 is a schematic structural view of another oblique crossing beam provided in the embodiment of the present application, and fig. 5 is a cross-sectional view of a connection structure of the second secondary beam stirrup in the oblique crossing beam shown in fig. 3.
As shown in fig. 2 to 5, the present embodiment provides a skew beam, including: the main beam 1 and the secondary beam 2, the included angle between the main beam 1 and the secondary beam 2 is an acute angle.
The main beam 1 comprises a main beam longitudinal rib 11 and a main beam stirrup 12. The longitudinal main beam ribs 11 extend along the length direction of the main beam 1, the number of the longitudinal main beam ribs 11 is multiple, and the longitudinal main beam ribs 11 are arranged side by side at intervals. The longitudinal beam stirrups 12 and the main beam longitudinal bars 11 are arranged perpendicularly, the longitudinal beam stirrups 12 are specifically rectangular stirrups, each main beam longitudinal bar 11 is arranged in the main beam stirrups 12 in a penetrating mode and is connected with the main beam stirrups 12 in a binding mode, and concrete to be poured forms a main beam. The number of the main beam stirrups 12 is a plurality of, and the main beam stirrups are arranged at intervals along the length direction of the main beam 1.
The secondary beam 2 includes: the secondary beam longitudinal ribs 21, the first secondary beam stirrups 23 and the second secondary beam stirrups 24. The secondary beam longitudinal ribs 21 extend along the length direction of the secondary beam 2, the number of the secondary beam longitudinal ribs is multiple, and the secondary beam longitudinal ribs 21 are arranged at intervals. The first secondary beam stirrups 23 are arranged at two ends of the secondary beam 2 at intervals and are vertically connected with the secondary beam longitudinal bars 21. Specifically, the end of each secondary beam longitudinal rib 21 is inserted into the primary beam stirrup 23 and is bound to the primary beam stirrup 23. The first secondary beam stirrup 23 and the second secondary beam stirrup 24 are both rectangular stirrups.
The second secondary beam stirrup 24 is positioned at the joint of the primary beam 1 and the secondary beam 2 and is arranged perpendicular to the secondary beam longitudinal rib 21. The second secondary beam stirrup 24 is connected with the secondary beam longitudinal rib 21 or the main beam longitudinal rib 11 positioned at the outermost side, and the length of the second secondary beam stirrup 24 is smaller than that of the first secondary beam stirrup 23.
For the connection mode of the secondary beam stirrup 24 and the secondary beam longitudinal bar 21, part of the secondary beam longitudinal bar 21 is arranged in the secondary beam stirrup 24 in a penetrating manner and is connected with the secondary beam stirrup 24 in a binding manner, as shown in fig. 2 and 3.
For the connection manner of the second secondary beam stirrup 24 and the main beam longitudinal bar 11 located at the outermost side, part of the secondary beam longitudinal bars 21 and the main beam longitudinal bar 11 at the outermost side are arranged in the second secondary beam stirrup 24 in a penetrating manner and are connected with the second secondary beam stirrup 24 in a binding manner, as shown in fig. 4 and 5.
And all the steel bars in the secondary beam 2 are connected together according to the mode, and concrete to be poured forms the secondary beam 2.
The technical scheme that this embodiment provided, the contained angle between girder and the secondary beam is the acute angle, and the secondary beam includes: the beam comprises secondary beam longitudinal ribs, first secondary beam stirrups and second secondary beam stirrups, wherein the first secondary beam stirrups are positioned at two ends of the secondary beam and are vertically connected with the secondary beam longitudinal ribs; the second secondary beam stirrup is positioned at the joint of the primary beam and the secondary beam and is arranged perpendicular to the secondary beam longitudinal bar; the second secondary beam stirrup is connected with the secondary beam longitudinal rib or the main beam longitudinal rib positioned at the outermost side in the main beam; the length of the beam stirrup of the second time is less than that of the beam stirrup of the first time, so that the problem that mutual interference of reinforcing steel bars is caused in the traditional scheme due to the reduction of the distance between the longitudinal beam stirrups and even concrete pouring and vibrating are influenced is solved, and the reliability and the application safety of the diagonal beam node are improved.
For the two types of skew beams provided in fig. 2 to 5 described above, setting may be performed according to the arrangement of the secondary beam longitudinal ribs 21. For example: when the middle part of the upper layer of the secondary beam 2 is provided with the secondary beam longitudinal rib 21, the secondary beam stirrup 24 is connected with the part of the secondary beam longitudinal rib 21; when the number of the upper-layer longitudinal ribs of the secondary beam 2 is less, the secondary beam stirrups 24 are connected with the main beam longitudinal ribs 11 on the outermost side.
On the basis of the above technical scheme, this embodiment optimizes the oblique crosspiece structure: the auxiliary beam is characterized in that auxiliary reinforcing steel bars penetrate through the included angle between the main beam 1 and the secondary beam 2, one end of each auxiliary reinforcing steel bar is connected to the main beam 1, the other end of each auxiliary reinforcing steel bar is connected to the secondary beam 2, and the auxiliary reinforcing steel bars serve as main frameworks of an auxiliary arm 3 formed by pouring concrete. The armpit 3 is formed in the included angle area of the main beam 1 and the secondary beam 2, and the stress concentration phenomenon at the acute angle of the node can be improved.
A specific implementation manner is as follows: the axillary reinforcement includes: a main beam connection section 31, a secondary beam connection section 32 and an intermediate section 33. The middle section 33 is a straight line section, an included angle between the middle section and the main beam 1 is an acute angle, one end of the middle section extends to the end part of the secondary beam 2, and the other end of the middle section extends to a node of the main beam 1. The included angle between the main beam connecting section 31 and the middle section 33 is an obtuse angle, and the main beam connecting section 31 is parallel to the main beam longitudinal ribs 11 and is connected with the main beam stirrups 12. The included angle between the secondary beam connecting section 32 and the middle section 33 is an obtuse angle, and the secondary beam connecting section 32 is parallel to the first secondary beam stirrup 23 and is connected with at least one secondary beam longitudinal rib 21.
The above contents are only one of the realization modes of the axillary reinforcing steel bars, and can also be realized by adopting other modes, and different axillary reinforcing steel bars can be obtained by adjusting the included angles between the middle section and the main beam connecting section and between the middle section and the secondary beam connecting section.
Further, the secondary beam 2 further includes: and the axillary reinforcing steel bar connecting rib 25 is arranged at the end part of the secondary beam 2 and is parallel to the secondary beam longitudinal rib 21. The secondary beam connecting section 32 is also connected with the axillary reinforcing steel bar connecting rib 25, so that the connection strength of the axillary reinforcing steel bar is improved.
The length of the axilla can be determined by the following formula:
wherein y is the length of the armpit and b is the width of the main beam.
The length of the armpit is determined according to the width of the main beam 1, the strength of the oblique crossing beam is improved, and the shear stress at the node of the oblique crossing beam can be reduced.
The other realization mode is as follows: the length of an armpit is determined according to the included angle between the main beam 1 and the secondary beam 2, and fig. 6 is an appearance schematic diagram of the oblique beam provided by the embodiment of the application. As shown in fig. 6, it is assumed that when the angle between the main beam 1 and the secondary beam 2 is 30 ° to 60 °, the ratio of the length X1 of the armpit in the extending direction of the main beam 1 to the length X2 of the armpit in the direction of the secondary beam 2 is 1: 2. The length X1 of the armpit along the extension direction of the main beam 1 is specifically the distance from the acute angle of the main beam 1 to the edge of the armpit, and the length X2 of the armpit along the direction of the secondary beam 2 is specifically the distance from the acute angle of the secondary beam 2 to the edge of the armpit. For example: when the included angle between the main beam 1 and the secondary beam 2 is 30-60 degrees, the length X1 of the armpit along the extension direction of the main beam 1 is 200mm, and the length X2 of the armpit along the direction of the secondary beam 2 is 400 mm.
In another mode: when the angle between the main beam and the secondary beam is more than 60 degrees, the ratio of the length X1 of the armpit along the extension direction of the main beam 1 to the length X2 of the armpit along the direction of the secondary beam 2 is 2:3, for example: the length X1 of the armpit along the extension direction of the main beam 1 is 200mm, and the length X2 of the armpit along the direction of the secondary beam 2 is 300 mm.
Fig. 7 is a schematic configuration diagram of a main beam stirrup in a skew beam according to an embodiment of the present application. As shown in fig. 7, the main beam stirrup 12 may be further configured as follows:
and the main beam is hooped in the range of 1/24-5/24 from the obtuse root part of the node to the span of the end part according to the rule that the increase of the shear stress is gradually reduced, and the range of the increase of the shear stress is 65-7 percent.
A specific implementation manner is as follows: the main beam is hooped by increasing the shear stress by 45-61% within the range of 1/24-1/12 (indicated by D1 in the figure) from the obtuse-angle root of the node to the end span; the range of 1/24-1/12 refers to 1/24-1/12 of the length L of the main beam.
The main beam is hooped by 50% -61% increase of shear stress within 1/12-1/8 (indicated by D2 in the figure) from the obtuse-angle root of the node to the span of the end; the range of 1/12-1/8 refers to 1/12-1/8 of the length L of the main beam.
The main beam is hooped by 32-50% of shear stress increase in a range of 1/8-1/6 (indicated by D3 in the figure) from the obtuse-angle root part of the node to the end part; the range of 1/8-1/6 refers to 1/8-1/6 of the length L of the main beam.
The main beam is hooped by 8% -32% of increase of shear stress within 1/6-5/24 (indicated by D4 in the figure) from the obtuse-angle root of the node to the span of the end; the range of 1/6-5/24 refers to 1/6-5/24 of the length L of the main beam.
The rest part of the main beam is hooped according to the hooping mode of the orthogonal beam, wherein the orthogonal beam means that the main beam 1 is vertically intersected with the secondary beam 2.
Fig. 8 is a schematic configuration diagram of a second secondary beam stirrup in the skew beam according to the embodiment of the present application. As shown in fig. 8, the second sub-beam stirrup 24 is arranged in the following manner:
the secondary beam spans 1/24-1/12 (indicated by H1 in the figure) from the node obtuse root part to the end part, and is hooped by 14% -27% of shear stress increase; the 1/24-1/12 range refers to 1/24-1/12 of the length of the secondary beam.
The secondary beam spans 1/12-1/8 (indicated by H2 in the figure) from the node obtuse root to the end part, and is hooped by increasing 12% -27% of shear stress; the 1/12-1/8 range refers to 1/12-1/8 of the length of the secondary beam.
And the rest parts in the secondary beams are hooped according to the hooping mode of the orthogonal beams.
Since the length of the main beam 1 is the same as that of the secondary beam 2, the hoop configuration of the secondary beam is calculated along with the length L of the main beam in this embodiment.
The hoop is matched according to the increase amount of the shear stress, and the hoop is determined by the following formula:
wherein, VuFor increased amount of shear stress, fyvCompressive strength of main beam stirrups, AsvFor all cross-sectional areas of the limbs of the stirrup to be arranged in the same cross-section, s is the stirrup spacing, h0Is the effective height of the cross section.
Fig. 9 is a schematic configuration view of a longitudinal bar of a secondary beam in an oblique beam according to an embodiment of the present application. As shown in fig. 9, the secondary beam longitudinal ribs 21 are further arranged in the following manner:
the secondary beam spans from the edge of the node acute angle armpit to the end part within the range of 0-1/24 (indicated by Y1 in the figure), and reinforcement is carried out according to the increase of the bending moment by 21-37%; the range of 0-1/24 refers to 0-1/24 of the length of the secondary beam.
The secondary beam spans from 1/24-1/12 (indicated by Y2 in the figure) from the edge of the node acute angle armpit to the end part, and reinforcement is carried out according to the increase of bending moment by 12% -21%; the 1/24-1/12 range refers to 1/24-1/12 of the length of the secondary beam.
Since the length of the main beam 1 is the same as that of the secondary beam 2, the hoop configuration of the secondary beam is calculated along with the length L of the main beam in this embodiment.
And (3) reinforcing the bars according to the increase of the bending moment, and determining by the following formula:
M＝f′yA′s(h0-a′s)，
wherein M is a bending moment increase amount, f'yIs a designed value of the compressive strength of the steel bar in the compression zone, A'sIs the cross-sectional area of the steel bar in the compression zone, h0Is a 'section effective height'sThe distance from the longitudinal rib resultant point of the compression area to the compression edge of the cross section.
The width of the first secondary beam stirrup 23 and the second secondary beam stirrup 24 is the width of the secondary beam minus 2 times the thickness of the stirrup protective layer. The stirrups are arranged in parallel and arranged at intervals along the length direction of the secondary beam, and the distance between every two adjacent stirrups is 100-200 mm.
In the scheme, the armpit 3 is arranged at the included angle between the main beam 1 and the secondary beam 2, so that the stress concentration phenomenon at the acute angle of the node can be improved. The stirrups are reinforced according to the mode, so that the shearing resistance of the node can be improved. Longitudinal bar reinforcement is carried out according to the mode, and the bearing capacity of the node can be improved.
The arrangement mode of the second-time beam stirrups 24 can ensure that the vibrating rod can be inserted into the diagonal beam secondary beam concrete, and the quality of the concrete and the strength and durability of the joint are ensured. The stirrups of large-scale concrete diagonal beam distribute evenly, avoid the stirrup stack, guaranteed the concrete protective layer thickness, guarantee the ductility of secondary beam node.
On the basis of the technical scheme, the embodiment also provides a building which comprises the oblique intersecting beam structure. The building may be a residential building, a commercial building, or the like. The building provided by the embodiment has the same technical effects as the oblique intersecting beam structure.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (13)
1. A skew beam structure, comprising: the main beam and the secondary beam form an acute angle;
the girder includes: the main beam longitudinal ribs and the main beam stirrups connected between the main beam longitudinal ribs;
the secondary beam includes: the secondary beam longitudinal reinforcements, the first secondary beam stirrups and the second secondary beam stirrups; the first secondary beam stirrups are positioned at two ends of the secondary beam and are vertically connected with the longitudinal bars of the secondary beam; the second secondary beam stirrup is positioned at the joint of the primary beam and the secondary beam and is arranged perpendicular to the secondary beam longitudinal bar; the second secondary beam stirrup is connected with the secondary beam longitudinal rib or the main beam longitudinal rib positioned at the outermost side; the length of the second beam stirrup is smaller than that of the first beam stirrup.
2. The skew beam structure of claim 1, further comprising: the auxiliary steel bar penetrates through a corner between the main beam and the secondary beam, one end of the auxiliary steel bar is connected to the main beam, and the other end of the auxiliary steel bar is connected to the secondary beam; the armpit reinforcing steel bars are used as main frameworks of armpits formed by concrete pouring.
3. The skew beam structure of claim 2, wherein the underarm reinforcement includes: the middle section, the main beam connecting section and the secondary beam connecting section; the middle section is a straight line section, an included angle between the middle section and the main beam is an acute angle, one end of the middle section extends to the end part of the secondary beam, and the other end of the middle section extends to a node of the main beam; the included angle between the main beam connecting section and the middle section is an obtuse angle, and the main beam connecting section is parallel to the main beam longitudinal ribs and is connected with the main beam stirrups; the included angle between secondary beam linkage segment and the interlude is the obtuse angle, and secondary beam linkage segment is parallel with first beam stirrup, indulges the muscle with at least one secondary beam and links to each other.
4. The cross-member structure according to claim 3, wherein when the angle between the main beam and the sub-beam is 30 ° to 60 °, the ratio of the length of the armpit in the extending direction of the main beam to the length of the armpit in the direction of the sub-beam is 1: 2;
when the included angle between the main beam and the secondary beam is larger than 60 degrees, the ratio of the length of the armpit along the extension direction of the main beam to the length of the armpit along the direction of the secondary beam is 2: 3.
5. The skew beam structure of claim 3 wherein the secondary beam further comprises: the axillary reinforcing steel bar connecting rib is arranged at the end part of the secondary beam and is parallel to the longitudinal rib of the secondary beam; the secondary beam connecting section is also connected with the axillary reinforcing steel bar connecting rib.
6. A cross-member structure according to any one of claims 2 to 5, wherein the length of the armpits is determined by the formula:
wherein y is the length of the armpit and b is the width of the main beam.
7. The skew beam structure of claim 2, wherein the main beam stirrups are configured as follows:
and the main beam is hooped in the range of 1/24-5/24 from the obtuse root part of the node to the span of the end part according to the rule that the increase of the shear stress is gradually reduced, and the range of the increase of the shear stress is 65-7 percent.
8. The skew beam structure of claim 7, wherein the main beam stirrups are arranged in a manner that:
the main beam is hooped in the range of 1/24-1/12 from the obtuse root of the node to the span of the end part according to the increase of the shear stress of 45% -61%;
the main beam is hooped in the range of 1/12-1/8 from the obtuse root of the node to the span of the end part according to the increase of 50% -61% of the shear stress;
the main beam is hooped within the range of 1/8-1/6 from the obtuse root of the node to the span of the end part according to the increase of 32% -50% of the shear stress;
the main beam is hooped in the range of 1/6-5/24 from the obtuse-angle root of the node to the span of the end part according to the increase of 8% -32% of the shear stress.
9. The skew beam structure of claim 2, wherein the second secondary beam stirrup is configured in a manner that:
the secondary beam is hooped within the range of 1/24-1/12 from the root of the node obtuse angle to the span of the end part according to the increase of 14% -27% of the shear stress;
the secondary beam is hooped within 1/12-1/8 of the span from the node obtuse root to the end according to the increase of 12% -27% of shear stress.
10. A diagonal beam structure according to claim 7, 8 or 9, wherein the hoop fitting is performed in accordance with the shear stress increase amount, determined by the following formula:
wherein, VuFor increased amount of shear stress, fyvCompressive strength of main beam stirrups, AsvFor all cross-sectional areas of the limbs of the stirrup to be arranged in the same cross-section, s is the stirrup spacing, h0Is the effective height of the cross section.
11. The cross-member structure according to claim 2, wherein the secondary longitudinal beam ribs are arranged in a manner that:
the secondary beam is reinforced within the range of 0-1/24 from the edge of the node acute angle armpit to the end span according to the increase of the bending moment by 21 percent to 37 percent;
the secondary beam is reinforced in the range of 1/24-1/12 from the edge of the node acute angle armpit to the end span according to the increase of the bending moment by 12% -21%.
12. The skew beam structure according to claim 11, wherein the reinforcement is performed according to the increase amount of the bending moment, which is determined by the following formula:
M＝f′yA′s(h0-a′s)，
wherein M is a bending moment increase amount, f'yIs a designed value of the compressive strength of the steel bar in the compression zone, A'sIs the cross-sectional area of the steel bar in the compression zone, h0Is a 'section effective height'sThe distance from the longitudinal rib resultant point of the compression area to the compression edge of the cross section.
13. A building, comprising: a cross-member structure as claimed in any one of claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571431.3A CN113293928A (en) | 2021-05-25 | 2021-05-25 | Oblique crossing beam structure and building applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110571431.3A CN113293928A (en) | 2021-05-25 | 2021-05-25 | Oblique crossing beam structure and building applying same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114575593A (en) * | 2022-03-10 | 2022-06-03 | 中国五冶集团有限公司 | Adjustable plate buckling formwork support frame for super-load small-clearance beam and construction method thereof |
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| CN212583333U (en) * | 2020-04-20 | 2021-02-23 | 中机国能电力工程有限公司 | Novel newly-built concrete beam and existing concrete column connected node |
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Application publication date: 20210824 |