A method for constructing a multi-layer stepped large space structure with triangular cantilever trusses

Abstract

A method for constructing a multi-layer stepped large space structure with a triangular cantilever truss, firstly, a vertical support system of a large-span stepped space is formed by triangular cantilever trusses, ground frame columns and shear walls at high and low positions of the space respectively; secondly, a beam-slab system connected by overlap is used to form a large-span stepped space; then, the cavity and hanging structure of the triangular cantilever truss are used to form mezzanines at high and low positions respectively to meet the needs of auxiliary functions; finally, through the calculation of the ultimate bearing capacity and the calculation of the limit state of normal use, the comfort is fully considered while ensuring the safety of the structure. The present invention cantilever at the high position of the structure to achieve a multi-layer column-free, stepped open space to meet the needs of the main ornamental buildings; at the same time, the lower chord of the triangular cantilever truss and the auxiliary hanging structure are used to form a mezzanine to meet the needs of auxiliary functions such as ventilation and equipment rooms.

Description

Technical Field

[0001] The present invention belongs to the field of structural engineering technology, and in particular to a method for constructing a multi-layer stepped large space structure with a triangular cantilever truss. The multi-layer large space structure with a triangular cantilever truss refers to a multi-layer column-free open space with an upper cantilever of not less than 10 meters and a span of not less than 40 meters, so as to meet the functional requirements of ornamental buildings. Background Art

[0002] The cantilever truss structural system is a lattice beam structure composed of a tensile upper chord, a compressive lower hanger, diagonal webs and vertical webs. When used as a vertical support for structural systems with large spans and large cantilevers, it has the advantages of light weight and high rigidity. It is widely used in structures that require large spans and large cantilevers to achieve building functions, and is particularly common in large and complex public buildings.

[0003] The stepped large space structure forms the main force system through the ground-mounted vertical components, such as shear walls and columns, and the frame inclined beams rising in the height direction, inclined beams of different spans, and transverse frame beams. The stepped floor is formed by overlapping the inclined beams. It has the advantages of clear force transmission, convenient construction, and high architectural freedom. It is widely used in buildings that require large spaces to realize architectural functions, and is particularly common in large ornamental architectural spaces.

[0004] For multi-layer stepped large space structures with large spans and large cantilevers, the overall system stress mode combining the cantilever truss structure and the stepped large space structure is a reasonable and effective solution. The low-level large space is realized by the stepped large space structure; the high-level large span and large cantilever space are realized by the cantilever truss structure. The form of the truss is determined according to the direction of the steps and the shape of the building.

[0005] The cantilevered stairs in the high-level area are a typical building functional space with cantilever as the main feature and large span as the auxiliary feature. Generally, multiple trusses are arranged along the width direction of the building functional space on the fixed side of the structure as the vertical support system. Due to the large cantilever range and heavy vertical load, higher requirements are placed on the stiffness and load-bearing performance of the vertical support cantilever truss. Therefore, the use of a triangular cantilever truss with a web is a more reasonable and effective solution.

[0006] In addition to the functional floor, multi-layer stepped large space structures need to set up auxiliary functional mezzanines on each floor. For high-position cantilevered areas, the space between the upper and lower chords of the trusses is used to form mezzanines. At the same time, the webs of the trusses can be optimized according to the functional requirements of the auxiliary rooms; for low-position cantilevered areas, hanging structures are introduced to form mezzanine spaces. Therefore, using trusses and hanging structures at high and low positions respectively is a more reasonable and effective structural layout solution.

[0007] The curved boundary shape and the staggered stepped floor layout can be achieved through inclined beams of different slopes and transverse beams of different elevations. The ground frame columns on the fixed side of the cantilever truss and the beam lifting columns are subject to greater forces. When arranging the structure, the upper and lower chords are extended to the fixed side by one span to balance the bending moment. When selecting components, steel tube concrete columns or steel concrete columns are used for the ground frame columns to give full play to the compressive properties of concrete.

[0008] In addition, multi-story stepped large-space structures have problems such as complex node connection structures, complex structural force performance, and seismic and comfort treatment of large spans and large cantilever areas. Reasonable and effective triangular truss design and large-space frame design and construction plans are also an important factor in ensuring the structural bearing performance and normal use.

[0009] In summary, it is necessary to study a construction method of a multi-layer stepped large space structure with a triangular cantilever truss, which is suitable for a complex structural system with high-position large cantilever and multi-layer large-span spatial structure characteristics and meets the functional requirements of stepped open viewing space. Summary of the invention

[0010] In order to overcome the shortcomings of the existing technology, the present invention provides a method for constructing a multi-story stepped large space structure with a triangular cantilever truss, which realizes a multi-story, column-free, stepped open space by cantilevering at a high position of the structure to meet the main architectural needs of viewing. At the same time, the lower chord of the triangular cantilever truss and the auxiliary hanging structure are used to form a mezzanine to meet the needs of auxiliary functions such as ventilation and equipment rooms.

[0011] The technical solution adopted by the present invention to solve its technical problem is:

[0012] A method for constructing a multi-story stepped large space structure with a triangular cantilever truss. First, a vertical support system of a large-span stepped space is formed by the triangular cantilever truss, ground frame columns and shear walls at high and low positions of the space respectively; secondly, a beam-slab system connected by overlap is used to form a large-span stepped space; then, the cavity and hanging structure of the triangular cantilever truss are used to form mezzanines at high and low positions respectively to meet the needs of auxiliary functions; finally, through the ultimate bearing capacity calculation and the normal use limit state calculation, the comfort is fully considered while ensuring the structural safety.

[0013] Furthermore, the multi-story stepped large space structure with triangular cantilever trusses includes a stepped large space structure, a suspended mezzanine structure and a stepped cantilever structure. The stepped large space structure is located at a low position of the structure, and is composed of grounded vertical components and a stepped beam-slab structure. The stepped floor is supported by arranging frame inclined beams, inclined beams and fully overlapped transverse beams that rise in the height direction to achieve functional requirements; the suspended mezzanine structure is located below the stepped large space structure, and is formed by inclined rods and hanging columns suspended from the upper structural beams and connected by a plane beam system; the stepped cantilever structure is located at a high position of the structure, and is composed of a plurality of parallel triangular cantilever trusses and a horizontal beam-slab system. The upper chord of the truss is in a broken line shape according to functional requirements, and support is provided for the stepped floor by fully overlapped transverse horizontal beams. The lower chord of the truss and the plane beam-slab system form a mezzanine space to meet the ancillary functional space requirements of the high-position space.

[0014] Preferably, the stepped large space structure includes a vertical support system composed of ground-to-ground shear walls and frame columns, inclined beams rising in the height direction, horizontal beams connected to the inclined beams, and floor slabs. The stepped space is mainly realized by connecting the horizontal beams with the inclined beams in a full overlap manner at different elevations, and the load acting on the stepped floor slab is transmitted to the vertical support system through the beam system.

[0015] Furthermore, the formation method comprises the following steps:

[0016] (1) Single-layer ground-to-ground shear walls, multi-layer ground-to-ground shear walls, local platform frame columns of stepped large space structures, and ground-to-ground frame columns of stepped large space structures together constitute the vertical support components and lateral force resisting components of the stepped large space structure;

[0017] (2) Hidden beams in low-level walls, longitudinal frame inclined beams of the stepped large space structure, longitudinal long-span inclined beams of the stepped large space structure, longitudinal short-span inclined beams of the stepped large space structure, and longitudinal side span sealing inclined beams of the stepped large space structure together constitute an inclined beam system that rises in the height direction in the stepped large space;

[0018] (3) The horizontal frame beams in the lower area of ​​the stepped large space structure, the horizontal frame beams in the middle area of ​​the stepped large space structure, the horizontal frame beams in the upper area of ​​the stepped large space structure, the horizontal side span frame beams in the upper area of ​​the stepped large space structure, and the horizontal support beams in the upper area of ​​the stepped large space structure together constitute the horizontal frame beam system in the stepped large space;

[0019] (4) The horizontal beams in the lower area of ​​the stepped large space structure, the horizontal beams in the middle area of ​​the stepped large space structure, and the horizontal beams in the upper area of ​​the stepped large space structure are connected to the inclined beam system through a full overlap method to form a stepped beam system in the stepped large space;

[0020] (5) The vertical hanger of the hanging sandwich structure is hung on the horizontal support beam of the high area of ​​the stepped large space structure; the oblique main tie rod of the hanging sandwich structure and the oblique secondary tie rod of the hanging sandwich structure are hung on the horizontal side span frame beam of the high area of ​​the stepped large space structure, together forming a vertical force system of the hanging structure; the vertical components are connected to each other through the horizontal frame beam of the hanging sandwich structure to form a whole;

[0021] (6) The lifting column of the lower beam of the stepped cantilever structure is supported by the horizontal side span frame beam of the high area of ​​the stepped large space structure, and together with the ground frame column of the stepped cantilever structure, it serves as the vertical supporting member of the stepped cantilever structure;

[0022] (7) The ground frame columns of the stepped cantilever structure, the upper columns of the lower beams of the stepped cantilever structure, the upper chords of the stepped cantilever structure, the lower chords of the stepped cantilever structure, and the diagonal webs of the stepped cantilever structure together constitute the basic unit of the vertical support triangular cantilever truss;

[0023] (8) The horizontal transverse beams at the junction of the upper and lower chords of the stepped cantilever structure, the horizontal transverse beams at the step sections of the stepped cantilever structure, the horizontal transverse beams at the upper chord of the stepped cantilever structure, and the horizontal transverse beams at the lower chord of the stepped cantilever structure connect the basic units of the triangular cantilever trusses to form a stepped cantilever structure.

[0024] The basic idea of ​​the present invention is based on triangular conversion trusses, floor-standing frame columns and shear walls, and realizes an open column-free space with rich auxiliary functions through a stepped fully overlapped beam-slab structural system:

[0025] The structural system has clear components and clear force transmission, which conforms to the design principle of overall force and load-bearing mode, and gives full play to the greater rigidity and load-bearing performance of the overall structural system. The high-level area is based on multiple parallel triangular cantilever trusses and multi-layer ground shear walls, and through the plane beam-slab structure of the auxiliary functional layer, the stepped full-lap beam-slab structure of the main functional layer constitutes a structural solution that meets the functional requirements; the low-level area is based on ground frame columns and ground shear walls, a stepped full-lap beam-slab structure system, and a hanging auxiliary structure to form a structural solution that meets the functional requirements.

[0026] The beneficial effects of the present invention are mainly manifested in: the multi-story stepped large space structure with triangular cantilever trusses provided by the present invention has a reasonable structural system structure, and can realize the multi-story column-free, stepped open viewing space requirements and various auxiliary functional space requirements by cantilevering at a high position of the structure, giving full play to the advantages of triangular cantilever trusses in large cantilevered stepped architectural modeling, and realizing the unity of function and modeling. The structural system uses the grounded shear wall, frame column and triangular cantilever truss as the main vertical support system of the structure, and connects the inclined beam and the horizontal beam system to form an overall spatial structure, and then forms a ladder through the fully overlapped horizontal beam; at the same time, the grounded shear wall is used as the main lateral force resisting component, which provides a guarantee for the earthquake resistance of the large span space. Through the calculation of the ultimate bearing capacity and the calculation of the normal use bearing capacity, the structure of the present invention is easy to control through indicators such as overall stiffness (deformation value control) and bearing capacity (reinforcement ratio / stress ratio control), further ensuring the rationality and effectiveness of the overall structural system. The structural system has clear component modules and clear force transmission. The overall system has large cantilevers, large spans, high bearing capacity, and strong adaptability to shapes. It has broad application prospects in complex structural systems for the functions and shapes of multi-story column-free large-space buildings in high-position large cantilever areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1a-1d They are respectively a structural schematic diagram of an embodiment of a multi-layer stepped large space structure with a triangular cantilever truss of the present invention, a schematic diagram of a stepped large space structure, a schematic diagram of a suspended mezzanine structure, and a schematic diagram of a stepped cantilever structure.

[0028] Figure 2a-2b It is a top plan view of a multi-layer stepped large space structure with a triangular cantilever truss of the present invention, that is, Figure 1b and 1c Schematic diagram of the middle AA section;

[0029] Figure 3 It is a sectional front view of an embodiment of a multi-layer stepped large space structure with a triangular cantilever truss of the present invention, that is, the BB sectional schematic diagram in FIG1 ;

[0030] Figure 4 It is a cut-away left view of an embodiment of a large space cantilever truss structure of the present invention, i.e., the CC cut-away schematic diagram in FIG1 ;

[0031] Figure 5a-5b It is a partial cross-sectional detail of the triangular cantilever truss structure and the suspended mezzanine structure in the present invention. The detail uses reinforced concrete as the main example material and provides a schematic diagram of the key nodes of the folded beam bending.

[0032] Figure 6 It is a composition relationship diagram of each specific component of the present invention.

[0033] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0034] 1. Single-layer ground-to-ground shear wall; 2. Multi-layer ground-to-ground shear wall; 2a. Hidden beam in low-level wall; 2b. Hidden beam in mezzanine wall; 2c. Hidden beam in high-level lower chord wall; 2d. Hidden beam in high-level upper chord wall; 3. Frame column of local platform of stepped large space structure; 4. Ground-to-ground frame column of stepped large space structure; 5. Longitudinal frame oblique beam of stepped large space structure; 6. Longitudinal long span oblique beam of stepped large space structure; 7. Longitudinal short span oblique beam of stepped large space structure; 8. Longitudinal edge sealing oblique beam of side span of stepped large space structure; 8a. Horizontal beam of local platform of stepped large space structure; 9. Horizontal frame beam of low area of ​​stepped large space structure; 10. Horizontal frame beam of middle area of ​​stepped large space structure; 11. Horizontal beam of high area of ​​stepped large space structure; 12. Horizontal side span frame beam of high area of ​​stepped large space structure; 13. 1. Horizontal beams in the lower area of ​​the structure; 2. Horizontal beams in the middle area of ​​the stepped large space structure; 3. Horizontal beams in the high area of ​​the stepped large space structure; 4. Horizontal support beams in the high area of ​​the stepped large space structure; 5. Oblique main tie rods for the suspended mezzanine structure; 6. Oblique secondary tie rods for the suspended mezzanine structure; 7. Horizontal beams for the suspended mezzanine structure; 8. Vertical suspenders for the suspended mezzanine structure; 9. Horizontal frame columns for the suspended mezzanine structure; 10. Vertical suspenders for the suspended mezzanine structure; 11. Floor-standing frame columns for the stepped cantilever structure; 12. Lifting columns for the lower beams of the stepped cantilever structure; 13. Upper chord rods for the stepped cantilever structure; 14. Lower chord rods for the stepped cantilever structure; 15. Horizontal beams at the junction of the upper and lower chords of the stepped cantilever structure; 16. Horizontal beams for the stepped sections of the stepped cantilever structure; 17. Horizontal beams for the upper chord of the stepped cantilever structure; 18. Horizontal beams for the lower chord of the stepped cantilever structure; 19. Diagonal web rods for the stepped cantilever structure. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] Refer to Figure 1~ Figure 6 A method for constructing a multi-story stepped large space structure with a triangular cantilever truss. First, a vertical support system of a large-span stepped space is formed by the triangular cantilever truss, the ground frame column and the shear wall at the high and low positions of the space respectively; secondly, a beam-slab system connected by overlap is used to form a large-span stepped space; then, the cavity and the hanging structure of the triangular cantilever truss are used to form a mezzanine at the high and low positions respectively to meet the needs of auxiliary functions; finally, through the ultimate bearing capacity calculation and the normal use limit state calculation, the comfort is fully considered while ensuring the structural safety.

[0037] The multi-layer stepped large space structure with triangular cantilever trusses includes a stepped large space structure, a suspended sandwich structure, and a stepped cantilever structure. The stepped large space structure is located at the lower part of the structure ( Figure 1b), the vertical support structure is composed of ground frame columns and shear walls, and the inclined frame beams rising in the height direction and the transverse frame beams of different elevations form the main load-bearing frame of the space; according to the building span and structural form, long-span and short-span inclined beams parallel to the inclined frame beams are added as needed; transverse beams and inclined beams of different elevations are overlapped to form a stepped structure as the main functional floor at the low position; the hanging structure is located below the stepped large space ( Figure 1c ), a vertical force-bearing unit for hanging mezzanines is formed by a plurality of hanging columns and cable-stayed beams, which are hung on the transverse support beams and frame beams of the stepped large space and connected to form a whole through transverse frame beams, serving as a low-level auxiliary functional floor; a stepped cantilever structure (1d) is located at a high position of the structure, and a plurality of triangular cantilever trusses are arranged in parallel to form a vertical supporting structure. Stepped transverse horizontal beams of different elevations are overlapped with the upper chords of the trusses to form a stepped floor, serving as a high-level main functional floor; the lower chord transverse horizontal beams are connected with the lower chords of the trusses to form a horizontal floor, serving as a high-level auxiliary functional floor.

[0038] like Figure 1b As shown, the main frame structure of the stepped large space structure is composed of ground shear walls 1-2, frame columns 3-4, frame oblique beams 5, oblique beams 6-8, and transverse frame beams 9-12 to form a frame structure that bears vertical loads; transverse beams 13-16 are overlapped and connected with the oblique beams to form a stepped floor. The ground shear walls 1-2 are symmetrically located on both sides of the structure to provide lateral stiffness for the structure; hidden beams 2a are set in the multi-layer ground shear walls 2 to provide support for the side spans of the stepped floor. At the same time, the horizontal beam 8a forms a local horizontal floor with the ground shear wall 1, frame columns 3, and transverse frame beams 9, and the stepped large space longitudinal side span sealing oblique beams 8 intersect with the local platform horizontal beams 8a through the herringbone nodes to realize the intersection and conversion of the inclined plate and the horizontal plate.

[0039] like Figure 1c As shown, the suspended mezzanine structure is suspended on the horizontal side span frame beams 12 of the high area of ​​the stepped large space structure and the horizontal support beams 16 of the high area of ​​the stepped large space structure by multiple groups of suspension columns 20 and oblique tension rods 17-18 according to the span. The horizontal frame beams 19 connect the suspension rods with the oblique tension beams to form a vertical support system for the sandwich panel. The hidden beams 2b are arranged in the multi-layer ground-to-ground shear walls 2 to provide support for the side spans of the suspended mezzanines.

[0040] like Figure 1dAs shown, the stepped cantilever structure is composed of an upper chord 23, a lower chord 24, a diagonal web 29, a ground frame column 21, and a lower beam upper column 22, forming a plurality of triangular cantilever trusses arranged in parallel as the vertical support of the upper cantilever structure. The horizontal beams 26 of the stepped sections with different elevations, the horizontal beams 25 at the junction of the upper and lower chords, and the horizontal beams 27 of the upper chord connect the upper chord of the triangular cantilever truss to form a stepped floor; the horizontal beams 25 at the junction of the upper and lower chords and the horizontal beams 28 at the lower chord simultaneously connect the lower chord of the triangular cantilever truss to form a sandwich floor support system of the cantilever structure; the horizontal beams 25 at the junction of the upper and lower chords are located at the cantilever end of the triangular cantilever truss, and also serve as the support beams of the upper and lower chord floor slabs; the hidden beams 2c and 2d are arranged in the multi-layer ground shear wall 2 at the corresponding positions of the upper and lower chords to provide support for the upper and lower chord side spans of the triangular cantilever truss.

[0041] like Figure 6 As shown, the specific component composition relationship of the triangular cantilever truss multi-layer ladder-type large space structure of the present invention is as follows:

[0042] (1) The single-layer ground-to-ground shear wall 1, the multi-layer ground-to-ground shear wall 2, the local platform frame column 3 of the stepped large space structure, and the ground-to-ground frame column 4 of the stepped large space structure together constitute the vertical support members and lateral force resisting members of the stepped large space structure;

[0043] (2) The hidden beams 2a in the low-level wall, the longitudinal frame inclined beams 5 of the stepped large space structure, the longitudinal long-span inclined beams 6 of the stepped large space structure, the longitudinal short-span inclined beams 7 of the stepped large space structure, and the longitudinal side span sealing inclined beams 8 of the stepped large space structure together constitute an inclined beam system rising in the height direction in the stepped large space;

[0044] (3) The horizontal frame beam 9 of the lower area of ​​the stepped large space structure, the horizontal frame beam 10 of the middle area of ​​the stepped large space structure, the horizontal frame beam 11 of the upper area of ​​the stepped large space structure, the horizontal side span frame beam 12 of the upper area of ​​the stepped large space structure, and the horizontal support beam 16 of the upper area of ​​the stepped large space structure together constitute the horizontal frame beam system in the stepped large space;

[0045] (4) The horizontal beams 13 of the lower area of ​​the stepped large space structure, the horizontal beams 14 of the middle area of ​​the stepped large space structure, and the horizontal beams 15 of the upper area of ​​the stepped large space structure are connected to the inclined beam system by a full overlap method, and together form a stepped beam system in the stepped large space;

[0046] (5) The vertical suspension rod 20 of the hanging sandwich structure is hung on the horizontal support beam 16 of the high area of ​​the stepped large space structure; the oblique main tie rod 17 of the hanging sandwich structure and the oblique secondary tie rod 18 of the hanging sandwich structure are hung on the horizontal side span frame beam 12 of the high area of ​​the stepped large space structure, together forming a vertical force system of the hanging structure; the vertical components are connected to each other through the horizontal frame beam 19 of the hanging sandwich structure to form a whole;

[0047] (6) The lifting column 22 of the lower beam of the stepped cantilever structure is supported by the horizontal side span frame beam 12 of the high area of ​​the stepped large space structure, and together with the ground frame column 21 of the stepped cantilever structure, it serves as a vertical supporting member of the stepped cantilever structure;

[0048] (7) The stepped cantilever structure ground frame column 21, the stepped cantilever structure lower beam upper column 22, the stepped cantilever structure upper chord 23, the stepped cantilever structure lower chord 24, and the stepped cantilever structure diagonal web member 29 together form a vertical support triangular cantilever truss basic unit;

[0049] (8) The horizontal beams 25 at the junction of the upper and lower chords of the stepped cantilever structure, the horizontal beams 26 at the step sections of the stepped cantilever structure, the horizontal beams 27 at the upper chords of the stepped cantilever structure, and the horizontal beams 28 at the lower chords of the stepped cantilever structure connect the basic units of the triangular cantilever trusses to form a stepped cantilever structure.

[0050] The present invention also provides a multi-layer stepped large space structure with triangular cantilever trusses for use in the design and bearing of multi-layer large space buildings with high-position large cantilevers and complex structural systems. The multi-layer large space structure with cantilever trusses refers to a multi-layer column-free open space with an upper cantilever of not less than 10 meters and a span of not less than 40 meters to meet the functional requirements of ornamental buildings.

[0051] The multi-layer stepped large space structure with triangular cantilever trusses in this embodiment is based on ground shear walls, frame columns and vertical support triangular cantilever trusses. The large space building function is realized through the large-span floor and cantilevered large-span floor. The main building function requirements are realized by forming a stepped floor through the inclined beam system rising in the height direction and the overlapping transverse beams. The auxiliary building function is realized by forming a mezzanine through the upper and lower chord spaces of the hanging structure and the truss structure. The structural system has clear component modules, clear force transmission, and the overall system has the performance advantages of large cantilever, large span, high bearing capacity, strong shape adaptability, etc.

[0052] The contents described in the embodiments of this specification are merely enumerations of implementation forms of the inventive concept and are for illustrative purposes only. The protection scope of the present invention should not be considered to be limited to the specific forms described in this embodiment, and the protection scope of the present invention also extends to equivalent technical means that can be thought of by ordinary technicians in this field based on the inventive concept.

Claims

1. A method for constructing a multi-layer stepped large space structure with triangular cantilever trusses, characterized in that: Firstly, the vertical support system of the long-span stepped space is formed by triangular cantilever trusses, floor-standing frame columns and shear walls at high and low positions respectively; secondly, the beam-slab system connected by overlap is used to form a long-span stepped space; then, the cavity and hanging structure of the triangular cantilever trusses are used to form mezzanines at high and low positions respectively to meet the needs of auxiliary functions; finally, through the ultimate bearing capacity calculation and the normal use limit state calculation, the comfort is fully considered while ensuring the structural safety; The multi-story stepped large space structure with triangular cantilever trusses includes a stepped large space structure, a suspended mezzanine structure and a stepped cantilever structure. The stepped large space structure is located at a low position of the structure, and is composed of grounded vertical components and a stepped beam-slab structure. The stepped floor is supported by arranging frame inclined beams, inclined beams and fully overlapped transverse beams that rise in the height direction to achieve functional requirements; the suspended mezzanine structure is located below the stepped large space structure, and is formed by inclined rods and hanging columns suspended from the upper structural beams and connected by a plane beam system; the stepped cantilever structure is located at a high position of the structure, and is composed of a plurality of parallel triangular cantilever trusses and a horizontal beam-slab system. The upper chord of the truss is in a broken line shape according to functional requirements, and the stepped floor is supported by fully overlapped transverse horizontal beams. The lower chord of the truss and the plane beam-slab system form a mezzanine space to meet the auxiliary functional space requirements of the high-position space.

2. The method for constructing a multi-layer stepped large space structure with a triangular cantilever truss according to claim 1, characterized in that: The stepped large space structure includes a vertical support system composed of ground-to-ground shear walls and frame columns, inclined beams rising in the height direction, horizontal beams connected to the inclined beams, and floor slabs. The stepped space is mainly realized by connecting the horizontal beams with the inclined beams in a full-lap manner at different elevations, and the load acting on the stepped floor slabs is transmitted to the vertical support system through the beam system.

3. The method for constructing a multi-layer stepped large space structure with a triangular cantilever truss according to claim 2, characterized in that: The formation method comprises the following steps: (1) Single-layer ground-to-ground shear walls, multi-layer ground-to-ground shear walls, local platform frame columns of stepped large space structures, and ground-to-ground frame columns of stepped large space structures together constitute the vertical support components and lateral force resisting components of the stepped large space structure; (2) Hidden beams in low-level walls, longitudinal frame inclined beams of the stepped large space structure, longitudinal long-span inclined beams of the stepped large space structure, longitudinal short-span inclined beams of the stepped large space structure, and longitudinal side span sealing inclined beams of the stepped large space structure together constitute an inclined beam system that rises in the height direction in the stepped large space; (3) The horizontal frame beams in the lower area of ​​the stepped large space structure, the horizontal frame beams in the middle area of ​​the stepped large space structure, the horizontal frame beams in the upper area of ​​the stepped large space structure, the horizontal side span frame beams in the upper area of ​​the stepped large space structure, and the horizontal support beams in the upper area of ​​the stepped large space structure together constitute the horizontal frame beam system in the stepped large space; (4) The horizontal beams in the lower area of ​​the stepped large space structure, the horizontal beams in the middle area of ​​the stepped large space structure, and the horizontal beams in the upper area of ​​the stepped large space structure are connected to the inclined beam system through a full overlap method to form a stepped beam system in the stepped large space; (5) The vertical hanger of the hanging sandwich structure is hung on the horizontal support beam of the high area of ​​the stepped large space structure; the oblique main tie rod of the hanging sandwich structure and the oblique secondary tie rod of the hanging sandwich structure are hung on the horizontal side span frame beam of the high area of ​​the stepped large space structure, together forming a vertical force system of the hanging structure; the vertical components are connected to each other through the horizontal frame beam of the hanging sandwich structure to form a whole; (6) The lifting column of the lower beam of the stepped cantilever structure is supported by the horizontal side span frame beam of the high area of ​​the stepped large space structure, and together with the ground frame column of the stepped cantilever structure, it serves as the vertical supporting member of the stepped cantilever structure; (7) The ground frame columns of the stepped cantilever structure, the upper columns of the lower beams of the stepped cantilever structure, the upper chords of the stepped cantilever structure, the lower chords of the stepped cantilever structure, and the diagonal webs of the stepped cantilever structure together constitute the basic unit of the vertical support triangular cantilever truss; (8) The horizontal transverse beams at the junction of the upper and lower chords of the stepped cantilever structure, the horizontal transverse beams at the step sections of the stepped cantilever structure, the horizontal transverse beams at the upper chord of the stepped cantilever structure, and the horizontal transverse beams at the lower chord of the stepped cantilever structure connect the basic units of the triangular cantilever trusses to form a stepped cantilever structure.

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