An integrated renovation structure for existing buildings

Abstract

The present invention discloses a fusion-type reconstruction structure for existing buildings, belonging to the technical field of building reconstruction, and solves the problems of large engineering quantity for the reinforcement and reconstruction of existing buildings and great influence on the structural historical features of existing buildings in the prior art. The fusion-type reconstruction structure for existing buildings of the present invention includes a steel structure with supports and a support sub-structure. The steel structure with supports has a floor slab superposition area with the concrete structure of the existing building, and the two use the floor slab superposition area to set up superposed beams to form a floor shear force completely transmitted connection node. The support sub-structure is arranged in the concrete structure area of the existing building. The fusion-type reconstruction structure for existing buildings of the present invention can be used for the reinforcement and reconstruction of existing buildings.

Description

Technical Field

[0001] The present invention belongs to the technical field of building renovation, and particularly relates to an integrated renovation structure for existing buildings. Background Art

[0002] At present, for the renovation and strengthening methods of existing buildings, the main purpose is to enhance the vertical load-bearing performance and horizontal (note: mainly seismic) load-bearing performance of the buildings themselves. Referring to past engineering experience, the vertical load-bearing performance of existing buildings usually relatively easily meets the control requirements of relevant codes; correspondingly, the horizontal (note: mainly seismic) load-bearing performance of existing buildings is likely to be difficult to meet the control requirements of relevant codes due to reasons such as the change of code standards in their construction years, the change of seismic fortification intensity, and the update of structural reliability control standards. System renovation and strengthening design measures need to be taken to ensure that the safety performance of the renovated structure meets the control requirements of relevant codes. The above analysis content is summarized as structural safety reinforcement for the former; the latter is summarized as structural seismic reinforcement (note: the height of the structure in renovation projects is usually limited, and the risk control situation is relatively rare, so it is mainly seismic); and the specific design methods and implementation measures of structural seismic reinforcement often constitute the core implementation part of the overall renovation and strengthening of existing buildings.

[0003] For structural seismic reinforcement, typical renovation design and reinforcement methods mainly include the following:

[0004] 1) Renovation and reinforcement methods for adjusting the structural system type, such as adding shear walls, frame columns, braces, sub-structures, etc.;

[0005] 2) Structural member renovation and reinforcement methods of dry construction methods represented by bonding steel reinforcement and carbon fiber reinforcement;

[0006] 3) Structural member renovation and reinforcement methods of wet construction methods represented by the method of increasing cross-section;

[0007] 4) Energy dissipation and shock absorption type overall structure reinforcement methods mainly by adding vibration isolation bearings and energy dissipation dampers.

[0008] The inherent defects of the above structural seismic reinforcement methods are mainly reflected in the following two aspects:

[0009] 1) For existing buildings with a relatively long construction age, due to reasons such as code changes, seismic fortification standard changes, and structural reliability control standard updates, it may lead to relatively large renovation and reinforcement work quantities, and it is relatively difficult to control the overall civil engineering cost of the project. The cost, construction period, and construction difficulty of the overall renovation project are all relatively at a high level;

[0010] 2) For some existing buildings with certain social, cultural, and historical values (note: such as historical buildings), adopting a traditional structural renovation and strengthening design plan may have a significant impact on the historical appearance of the structural part of the existing building. The structural state of the building changes greatly before and after the renovation (note: such as measures for renovating components such as adding shear walls, braces, frame columns, system renovation of substructures, or increasing the cross-sectional area method), which constitutes a relatively significant adverse impact on the preservation and continuation of the social, cultural, and historical values of the existing building. Summary of the Invention

[0011] In view of the above analysis, the present invention aims to provide an integrated renovation structure for existing buildings, which solves the problems of large engineering quantities for renovation and strengthening of existing buildings and significant impact on the structural historical features of existing buildings in the prior art.

[0012] The object of the present invention is mainly achieved through the following technical solutions:

[0013] The present invention provides an integrated renovation structure for existing buildings, including a steel structure with braces and a supporting substructure. The steel structure with braces has a floor slab superimposed area with the concrete structure of the existing building. The two use the floor slab superimposed area to set up superimposed beams to form a floor shear force fully transmitted connection node. The supporting substructure is arranged in the area of the concrete structure of the existing building.

[0014] Further, the steel structure with braces is a concentrically braced steel frame structure, a steel frame structure with load-bearing buckling-restrained braces, or a concentrically braced steel frame structure using concrete-filled steel tubes. The concrete structure of the existing building is a reinforced concrete frame structure. The floor shear force is fully transmitted through the connection of the superimposed beam nodes between some steel beams of the steel structure with braces and some concrete beams of the concrete structure of the existing building.

[0015] Further, the superimposed beams corresponding to the floor slab superimposed area between the above-mentioned steel structure with braces and the concrete structure of the existing building are arranged in a cross shape in plan.

[0016] Further, the area of the above-mentioned superimposed area accounts for 40% - 60% of the floor area of the existing building.

[0017] Further, the width of the above-mentioned superimposed area accounts for more than 40% of the floor plane width of the existing building.

[0018] Further, the supporting substructure is a load-bearing buckling-restrained supporting substructure with a steel frame.

[0019] Furthermore, the above-mentioned load-bearing buckling-restrained brace substructure with a steel frame includes a load-bearing buckling-restrained brace, a brace connection section, a steel frame hoop, and a reinforced concrete composite layer; the load-bearing buckling-restrained brace is arranged inside the steel frame hoop through the brace connection section, and the steel frame hoop is connected to the existing building concrete structure through the reinforced concrete composite layer.

[0020] Furthermore, the brace substructure is arranged bidirectionally, and the number of brace substructures is multiple. The multiple brace substructures are evenly and symmetrically arranged, with a part arranged along the transverse direction of the existing building and the other part arranged along the longitudinal direction of the existing building.

[0021] Furthermore, the brace substructure is arranged at the building elevation, traffic core, and / or seismic joint position of the existing building.

[0022] Furthermore, the steel structure with braces and the existing building concrete structure are connected through joints to achieve complete transfer of floor shear force.

[0023] Furthermore, the above-mentioned composite beam joint includes a U-shaped connector, beam structure anchor bolts, joint structure anchor bolts, and through bolts. The steel beam of the steel structure with braces is located at the open end of the U-shaped connector, and the concrete beam of the existing building concrete structure is located in the area surrounded by the U-shaped connector and the steel beam of the steel structure with braces. The bottom end of the concrete beam of the existing building concrete structure is connected to the bottom end of the U-shaped connector through the joint structure anchor bolts, and the top end of the concrete beam of the existing building concrete structure is connected to the bottom end of the steel beam of the steel structure with braces through the beam structure anchor bolts; the through bolts penetrate through the U-shaped connector and the concrete beam of the existing building concrete structure.

[0024] Furthermore, at the position corresponding to the U-shaped connector of the composite beam joint, stiffeners are arranged at the corresponding center position of the steel beam of the steel structure with braces.

[0025] Furthermore, the side wall of the U-shaped connector extends to the top of the steel beam of the steel structure with braces and is connected with the lower flange, upper flange, and stiffeners of the steel beam with equal strength (for example, by welding).

[0026] Furthermore, the beam structure anchor bolts are self-drilling and tapping mechanical anchor bolts, and the joint structure anchor bolts are self-drilling and tapping mechanical anchor bolts.

[0027] Furthermore, the joint also includes a pressing plate arranged in the vertical direction of the U-shaped connector, and the pressing plate is connected to the concrete beam of the existing building concrete structure through a single row of through bolts.

[0028] Furthermore, the pressing plate is close to the top end of the existing building concrete structure and is arranged closely against the lower side of the floor slab of the existing building concrete structure.

[0029] Furthermore, the pressing plate is connected to the concrete beam of the existing building concrete structure through a single row of through bolts.

[0030] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0031] a) The integrated reconstruction structure of existing buildings provided by the present invention can effectively control the horizontal seismic action borne by the existing building structure system, reduce the implementation scope of the reconstruction and reinforcement measures for the existing building concrete structure, reduce the reconstruction and reinforcement engineering workload, and improve the economic rationality level of the overall reconstruction and reinforcement engineering, which has important economic significance;

[0032] b) The integrated renovation structure of existing buildings provided by the present invention can effectively improve the renovation and reinforcement mode of the concrete structure area of the existing building, increase the retention ratio of the historical original appearance of the existing structure of the existing building as much as possible, and effectively ensure the preservation of the original appearance of the existing building; basically achieve that the main relevant structural beams, columns and other components in the concrete structure area of the existing building can basically meet the bearing capacity and deformation control standards required by the relevant specifications based on the current structure status, and eliminate the renovation and reinforcement measures of the concrete structure area of the existing building as a whole or in most areas; achieve the purpose of preserving the current status of the existing building structure and the historical appearance of the existing building to the greatest extent and in the largest scope, that is, to achieve the renovation and reinforcement design purpose of bringing the old with the new and repairing the old as the old; for existing buildings with certain social, humanistic and historical values, it has important cultural significance;

[0033] c) The integrated reconstruction structure of the existing building provided by the present invention utilizes the large lateral stiffness and strong horizontal seismic force resistance of the newly built steel structure with support. The newly built steel structure with support bears the main horizontal seismic load and the vertical load within the corresponding projection range. The steel structure with support and the existing building concrete structure form a unified structural monomer for coordinated load bearing, realizing 100% floor shear force transmission; the existing building concrete structure mainly bears the vertical load within the corresponding projection area, effectively reducing the proportion of horizontal seismic load;

[0034] d) The integrated reconstruction structure of the existing building provided by the present invention further gathers and concentrates the horizontal seismic load of the existing building concrete structure area by adding a supporting substructure in the existing building concrete structure area. On the basis of the newly built steel structure system with support to share the main horizontal seismic load, the remaining horizontal seismic load borne by the existing building concrete structure area is further gathered and absorbed by locally setting a supporting substructure to concentrate the horizontal seismic action in the added supporting substructure area, thereby reducing the horizontal seismic force borne by other areas of the existing building concrete structure;

[0035] e) The integrated retrofit structure of the existing building provided by the present invention has a node with two shear connections. Among them, the concrete beam of the existing building's concrete structure and the steel beam structure with supports are connected through U-shaped connectors. The concrete beam of the existing building's concrete structure is connected to the U-shaped connector through through bolts, forming a primary shear connection as the first shear force transmission component group. The concrete beam of the existing building's concrete structure and the steel beam structure with supports are connected through beam structure anchor bolts, and the concrete beam of the existing building's concrete structure and the U-shaped connector are connected through node structure anchor bolts, forming a secondary shear connection as the second shear force transmission component group. In this way, since the U-shaped connectors, node structure anchor bolts, and through bolts are all rigid components, the effective transmission of the floor horizontal shear force from the existing building's concrete structure to the steel structure with supports can be achieved. The U-shaped connectors, node structure anchor bolts, and through bolts are designed based on the floor shear force under the rare earthquake condition of the overall structure, and are determined by proportionally distributing according to the total floor earthquake shear force in a single direction and the number of total shear-resistant nodes in a single direction.

[0036] Other features and advantages of the present invention will be described in the following specification, and some of them will become obvious from the specification or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structure specifically pointed out in the written specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings are only for the purpose of showing specific embodiments and are not considered as a limitation of the present invention. Throughout the drawings, the same reference numerals represent the same components;

[0038] Figure 1 It is a schematic structural diagram of the integrated retrofit structure of the existing building provided in Embodiment 1 of the present invention;

[0039] Figure 2 It is a three-dimensional view of the integrated retrofit structure of the existing building provided in Embodiment 1 of the present invention;

[0040] Figure 3 It is a top view of the integrated retrofit structure of the existing building provided in Embodiment 1 of the present invention;

[0041] Figure 4 It is a schematic diagram of the "well" - shaped arrangement of the composite beams in the integrated retrofit structure of the existing building provided in Embodiment 1 of the present invention;

[0042] Figure 5 It is a three-dimensional view of the single - floor structure in the integrated retrofit structure of the existing building provided in Embodiment 1 of the present invention;

[0043] Figure 6 It is a schematic structural diagram of the node in the integrated retrofit structure of the existing building provided in Embodiment 1 of the present invention;

[0044] Figure 7 The side view of the joint in the integrated renovation structure of existing buildings provided in the first embodiment of the present invention;

[0045] Figure 8 The three-dimensional connection diagram of the joint and the steel beam with braces in the integrated renovation structure of existing buildings provided in the first embodiment of the present invention;

[0046] Figure 9 The three-dimensional connection diagram of the joint and the concrete beam of the existing building concrete structure and the steel beam with braces in the integrated renovation structure of existing buildings provided in the first embodiment of the present invention.

[0047] Figure 10 The structural schematic diagram of the support sub-structure in the integrated renovation structure of existing buildings provided in the first embodiment of the present invention;

[0048] Figure 11 The structural schematic diagram of the joint in the integrated renovation structure of existing buildings provided in the second embodiment of the present invention;

[0049] Figure 12 The side view of the joint in the integrated renovation structure of existing buildings provided in the second embodiment of the present invention;

[0050] Figure 13 The three-dimensional connection diagram of the joint and the steel beam with braces in the integrated renovation structure of existing buildings provided in the second embodiment of the present invention;

[0051] Figure 14 The three-dimensional connection diagram of the joint and the concrete beam of the existing building concrete structure and the steel beam with braces in the integrated renovation structure of existing buildings provided in the second embodiment of the present invention.

[0052] Reference numerals:

[0053] 1 - Existing building concrete structure; 2 - Steel structure with braces; 21 - Upper flange; 22 - Lower flange; 23 - Web; 24 - Stiffener; 3 - U-shaped connector; 4 - Beam structure anchor bolt; 5 - Joint structure anchor bolt; 6 - Through bolt; 7 - Pressure plate; 8 - Support sub-structure; 81 - Load-bearing buckling-restrained brace; 82 - Support connection section; 83 - Steel frame hoop; 84 - Reinforced concrete composite layer. Detailed implementation manners

[0054] The following will specifically describe the preferred embodiments of the present invention in conjunction with the drawings. The drawings form a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention.

[0055] Based on the application status of the renovation and strengthening mode of existing buildings, considering the inherent structural properties of some existing buildings and the requirements of renovation and strengthening objectives, especially a batch of historical buildings with a long construction age, the original seismic bearing capacity of the overall structure is relatively low; at the same time, it is necessary to retain the original historical features of the main structure to a large extent to achieve the purpose of continuing and preserving social, cultural, and historical values. Developing a new type of renovation and strengthening structure type to solve the above problems has important economic and cultural values.

[0056] The present invention provides a composite renovation structure for existing buildings. Refer to Figures 1 to 10 , which includes a steel structure with braces 2 and a support substructure 8. The steel structure with braces 2 has a floor slab superposition area with the existing building concrete structure 1 (for example, a composite soil column and / or a concrete beam). The two use the floor slab superposition area to set a superimposed beam to form a floor shear force fully transmitted connection node. The support substructure 8 is arranged in the area of the existing building concrete structure 1.

[0057] Exemplarily, the steel structure with braces 2 is a concentrically braced steel frame structure, a steel frame structure with load-bearing buckling-restrained braces, or a concentrically braced steel frame structure using concrete-filled steel tubes. The existing building concrete structure 1 is a reinforced concrete frame structure. The existing building concrete structure 1 has 5 floors, and the steel structure with braces 2 has 7 floors. The floor shear force is fully transmitted through the superimposed beam node style between some steel beams of the steel structure with braces 2 and some concrete beams of the existing building concrete structure 1.

[0058] Compared with the prior art, the composite renovation structure for existing buildings provided by the present invention can effectively control the horizontal seismic action borne by the existing building structure system, narrow the implementation scope of the renovation and strengthening measures for the existing building concrete structure 1, reduce the renovation and strengthening workload, and improve the economic rationality level of the overall renovation and strengthening project; effectively improve the renovation and strengthening mode in the area of the existing building concrete structure 1, maximize the retention ratio of the historical original appearance of the existing building structure, effectively ensure the preservation of the original appearance of the existing building, and basically achieve that the relevant structural beams, columns and other components in the area of the existing building concrete structure 1 can meet the bearing capacity and deformation control standards of the relevant specifications relying on the original structure status. The renovation and strengthening measures in the area of the existing building concrete structure 1 are eliminated as a whole or in most areas, achieving the purpose of preserving the existing building structure status and the historical features of the existing building to the greatest extent and in the largest range, that is, achieving the renovation and strengthening design purpose of bringing the new with the old and repairing the old as the old; for existing buildings with certain social, cultural, and historical values, it has important cultural significance.

[0059] Specifically, for the integrated renovation structure of the existing building, on the one hand, the newly built steel structure with braces 2 system has a large lateral stiffness and strong horizontal seismic force resistance ability. The newly built steel structure with braces 2 part bears the main horizontal seismic load and the vertical load within the corresponding projection range. The steel structure with braces 2 and the existing building concrete structure 1 form a unified structural unit with collaborative bearing to achieve complete floor shear transfer. The existing building concrete structure 1 part mainly bears the vertical load within the corresponding projected area, effectively reducing the proportion of the horizontal seismic load borne.

[0060] On the other hand, by using the measure of adding bracing sub-structures 8 in the area of the existing building concrete structure 1, the horizontal seismic loads in the area of the existing building concrete structure 1 are further converged and concentrated. On the basis that the newly built steel structure with braces 2 system shares the main horizontal seismic load, for the remaining part of the horizontal seismic load borne by the existing building concrete structure 1 area, by locally setting bracing sub-structures 8, the horizontal seismic action is further converged and absorbed and concentrated in the area of the added bracing sub-structures 8, thereby reducing the horizontal seismic force borne by other areas of the existing building concrete structure 1.

[0061] It should be noted that the above "new" represents the newly built steel structure with braces 2 system of the overall structure and the bracing sub-structures 8 added in the area of the existing building concrete structure 1; the "old" represents the original state structure in the area of the existing building concrete structure 1.

[0062] In addition, it should be noted that in the area of the existing building concrete structure 1, except for the area where bracing sub-structures 8 are locally added, the bearing capacity checks of lateral force resisting members such as frame beams and frame columns in other main areas can basically meet the code requirements, and basically no additional structural reinforcement design measures are required, which basically matches the design assumption of only bearing the vertical load within its own range.

[0063] To effectively ensure the effective transfer of horizontal seismic shear forces in all directions, according to the layout of the concrete beams in the existing building concrete structure 1, the superimposed beams corresponding to the above-mentioned floor slab superimposed area are arranged in a "grid" shaped two-way plane layout.

[0064] Considering the contribution of the overall structural lateral stiffness and the control effect of the bearing capacity of the components in the area of the existing building concrete structure 1 comprehensively, the bearing type buckling restrained brace has significant advantages compared with the energy dissipation type buckling restrained brace. Therefore, the bearing type buckling restrained brace 81 is set in the above-mentioned bracing sub-structure 8.

[0065] It should be noted that the output level of the bearing type buckling restrained brace 81 in the bracing sub-structure 8 is set not to exceed the yield bearing capacity under frequent earthquakes and not to exceed the ultimate bearing capacity under fortification intensity earthquakes. Specifically:

[0066] Under frequent earthquake conditions, the load-bearing restrained buckling brace 81 in the support substructure 8 is controlled not to exceed the yield bearing capacity, ensuring that the overall structure is in a load-bearing elastic state, that is, meeting the "small earthquake-proof" design requirement.

[0067] Under the design intensity condition, the load-bearing restrained buckling brace 81 in the control support substructure 8 can yield, but does not exceed the ultimate bearing capacity, ensuring that the overall structure enters partial plastic development, but still ensuring that the load-bearing restrained buckling brace does not stop working, that is, meeting the "medium earthquake repairable" standard design requirements.

[0068] Under rare earthquake conditions, the load-bearing restrained buckling brace 81 of the supporting substructure 8 can exceed the ultimate bearing capacity, and the overall structure is verified to meet the "no collapse in a major earthquake" design requirement by completely withdrawing the load-bearing restrained buckling brace from working.

[0069] The above-mentioned principle for selecting the treatment level of the load-bearing restrained buckling brace can, on the one hand, effectively ensure the safety properties of the overall structure under various seismic fortification intensity conditions; on the other hand, it can greatly ensure the actual controllable properties of the supporting substructure 8 provided with the load-bearing restrained buckling brace 81, the interior of the supporting substructure 8 and the nodes effectively connected with the existing building concrete structure 1.

[0070] In order to ensure the effective, sufficient and complete transmission of the seismic shear force of the floors between the existing building concrete structure 1 and the supported steel structure 2 to the greatest extent, the layout range of the composite beams is expanded as much as possible within the overlapping range of the floors of the two buildings. For example, the area of the overlap zone accounts for 40% to 60% of the floor area of the existing building; the width of the overlap zone accounts for more than 40% of the plane width of the floor of the existing building. In this way, by limiting the ratio of the area of the overlap zone to the floor area of the existing building within the above range, the layout range of the composite beams can be expanded as much as possible within the overlapping range of the floors of the two buildings, thereby ensuring the effective, sufficient and complete transmission of the seismic shear force of the floors between the existing building concrete structure 1 and the supported steel structure 2 to the greatest extent.

[0071] The steel beam with supporting steel structure 2 is specifically an I-beam, which includes an upper flange 21 and a lower flange 22 arranged in parallel and a web 23 connecting the upper flange 21 and the lower flange 22 .

[0072] In order to improve the local stability of the steel beam with the supporting steel structure 2, the steel beam with the supporting steel structure 2 further includes a stiffening rib 24 disposed between the upper flange 21 and the lower flange 22, the upper end of the stiffening rib 24 is strongly connected (for example, welded) to the upper flange 21, the lower end of the stiffening rib 24 is strongly connected (for example, welded) to the lower flange 22, and the side wall of the stiffening rib 24 is strongly connected (for example, welded) to the web 23. In this way, by providing the stiffening rib 24, the local stability of the steel beam with the supporting steel structure 2 can be greatly improved, thereby improving the mechanical strength of the steel beam with the supporting steel structure 2.

[0073] Regarding the structure of the support sub-structure 8, specifically, it can be a bearing-type buckling-restrained support sub-structure with a steel frame, including a bearing-type buckling-restrained support 81, a support connection section 82, a steel frame hoop 83, and a reinforced concrete composite layer 84. The bearing-type buckling-restrained support 81 is arranged inside the steel frame hoop 83 through the support connection section 82, and the steel frame hoop 83 is connected to the existing building concrete structure 1 through the reinforced concrete composite layer 84.

[0074] Regarding the setting principle of the support sub-structure 8, in practical applications, it should be set in two directions as much as possible. That is to say, the number of support sub-structures 8 is multiple, and the multiple support sub-structures 8 are evenly and symmetrically arranged. Part of them are arranged along the transverse direction of the existing building, and the other part is arranged along the longitudinal direction of the existing building. Considering the influence of the support sub-structure 8 on the indoor building space of the existing building, the support sub-structure 8 can be set at the building facade, the traffic core, and / or the seismic joint position.

[0075] In order to ensure the complete transfer of the floor seismic shear force, the steel structure with braces 2 and the existing building concrete structure 1 are connected through joints to achieve the complete transfer connection of the floor shear force. For the structure of the joint, specifically, for the composite connection of the existing building concrete structure 1 (concrete beam) and the steel structure with braces 2 (steel beam) in the composite beam, this joint includes a U-shaped connector 3, beam structure anchor bolts 4, joint structure anchor bolts 5, and through bolts 6. The steel beam of the steel structure with braces 2 is located at the open end of the U-shaped connector 3, and the concrete beam of the existing building concrete structure 1 is located in the area enclosed by the U-shaped connector 3 and the steel beam of the steel structure with braces 2. The bottom end of the concrete beam of the existing building concrete structure 1 is connected to the bottom end of the U-shaped connector 3 through the joint structure anchor bolts 5, and the top end of the concrete beam of the existing building concrete structure 1 is connected to the bottom end of the steel beam of the steel structure with braces 2 through the beam structure anchor bolts 4; the through bolts 6 penetrate through the U-shaped connector 3 and the concrete beam of the existing building concrete structure 1. The above joint has two shear connections. Among them, the concrete beam of the existing building concrete structure 1 and the steel beam of the steel structure with braces 2 are connected through the U-shaped connector 3, and the concrete beam of the existing building concrete structure 1 is connected to the U-shaped connector 3 through the through bolts 6, forming a primary shear connection as the first shear force transfer component group; the concrete beam of the existing building concrete structure 1 and the steel beam of the steel structure with braces 2 are connected through the beam structure anchor bolts 4, and the concrete beam of the existing building concrete structure 1 and the U-shaped connector 3 are connected through the joint structure anchor bolts 5, forming a secondary shear connection as the second shear force transfer component group. In this way, since the U-shaped connector 3, the joint structure anchor bolts 5, and the through bolts 6 are all rigid members, the effective transfer of the floor horizontal shear force from the existing building concrete structure 1 to the steel structure with braces 2 can be achieved. The U-shaped connector 3, the joint structure anchor bolts 5, and the through bolts 6 are designed according to the floor shear force under the rare earthquake condition of the overall structure, and are determined by proportionally distributing the total floor seismic shear force in one direction and the total number of shear-resistant joints in one direction.

[0076] It should be noted that for the extended height of the U-shaped connector 3, the side wall of the U-shaped connector 3 extends to the top end of the steel beam of the steel structure with braces 2 and is fixedly connected (for example, welded) to the top end and / or side wall of the steel beam of the steel structure with braces 2. That is to say, the side wall of the U-shaped connector 3 is strongly connected (for example, welded) to the lower flange 22, upper flange 21, stiffening rib 24, etc. of the steel beam. For such a joint, the overall shear force transfer bearing performance is good, and the construction difficulty and civil engineering cost control are also in a relatively moderate state, which can take into account the joint bearing performance, construction difficulty, and civil engineering cost.

[0077] For the selection of the types of the beam structure anchor bolts 4 and the joint structure anchor bolts 5, exemplarily, the beam structure anchor bolts 4 can be self-drilling and tapping mechanical anchor bolts. Similarly, the joint structure anchor bolts 5 can also be self-drilling and tapping mechanical anchor bolts.

[0078] Embodiment 2

[0079] This embodiment provides an integrated retrofit structure for existing buildings. Refer to Figures 11 to 14 , whose structure is basically the same as that of the integrated retrofit structure for existing buildings provided in the first embodiment, except that: it further includes a pressing plate 7 arranged in the vertical direction of the U-shaped connecting piece 3, and the pressing plate 7 is connected to the concrete beam of the existing building concrete structure 1 through single-row through bolts 6.

[0080] Compared with the prior art, the integrated retrofit structure for existing buildings provided in this embodiment has the following beneficial effects while having the beneficial effects of the integrated retrofit structure for existing buildings provided in the first embodiment:

[0081] Through the setting of the pressing plate 7, the U-shaped connecting piece 3 and the through bolts 6 can be limited, so as to improve the binding force on the U-shaped connecting piece 3 and the concrete beam of the existing building concrete structure 1.

[0082] Compared with the integrated retrofit structure for existing buildings provided in the first embodiment, the integrated retrofit structure for existing buildings in this embodiment sets a pressing plate 7 at a position close to the top of the concrete beam of the existing building concrete structure 1, and realizes effective anchoring with the concrete beam of the existing building concrete structure 1 through the through bolts 6, strengthening the effective constraint on the U-shaped connecting piece 3 in the stress concentration area. Due to the adoption of the constraint measure of adding a pressing plate 7 in the stress concentration development area of the U-shaped connecting piece 3, the out-of-plane warping deformation trend of the U-shaped connecting piece 3 is effectively reduced, and the shear force transfer bearing performance of the joint area can be significantly improved.

[0083] This type of joint style can greatly improve the shear bearing capacity of the joint area, but adding a pressing plate 7 will increase the construction difficulty and civil engineering cost to a certain extent; therefore, the joints in this embodiment are applicable to the situation where the floor shear force values to be transferred between the new and old structures are large, and the current state of the concrete structure is poor and it is not suitable to set multi-row bolt strengthening measures.

[0084] In order to strengthen the binding force of the U-shaped connecting piece 3 in the stress concentration area, the pressing plate 7 is close to the top of the existing building concrete structure 1. This is because, in practical applications, the stress concentration area is mainly located at the connection position between the concrete beam of the existing building concrete structure 1 and the steel beam of the steel structure with supports 2. Setting the pressing plate 7 at a position close to the top of the concrete beam of the existing building concrete structure 1 can effectively strengthen the binding force on the U-shaped connecting piece 3 and the concrete beam of the existing building concrete structure 1 in the stress concentration area.

[0085] It should be noted that the top of the concrete beam of the existing building concrete structure 1 is usually the floor slab, and the pressing plate 7 cannot be set here. Therefore, the pressing plate 7 can be set closely below the floor slab.

[0086] It should be noted that, based on the structure of the steel structure with supports 2, for the extension height of the U-shaped connector 3, the side walls of the U-shaped connector 3 extend to the top of the steel beam of the steel structure with supports 2, and the side walls of the U-shaped connector 3 are fixedly connected (for example, welded) to the lower flange 22, the stiffening rib 24 and the upper flange 21 respectively.

[0087] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An integrated renovation structure for existing buildings, characterized in that, It includes a steel structure with braces and a substructure with braces; The steel structure with braces has a floor slab composite area with the existing building concrete structure. A composite beam is set using the floor slab composite area, forming a floor shear force fully transmitted connection node; The substructure with braces is set in the area of the existing building concrete structure; The steel structure with braces and the existing building concrete structure achieve a full transmission connection of floor shear force through a node; The node includes a U-shaped connecting piece, beam structure anchor bolts, node structure anchor bolts and through bolts. The steel beam of the steel structure with braces is located at the open end of the U-shaped connecting piece. The concrete beam of the existing building concrete structure is located in the area surrounded by the U-shaped connecting piece and the steel beam of the steel structure with braces. The bottom end of the concrete beam of the existing building concrete structure is connected to the bottom end of the U-shaped connecting piece through the node structure anchor bolts. The top end of the concrete beam of the existing building concrete structure is connected to the bottom end of the steel beam of the steel structure with braces through the beam structure anchor bolts. The through bolts penetrate the U-shaped connecting piece and the concrete beam of the existing building concrete structure; The concrete beam of the existing building concrete structure and the steel beam of the steel structure with braces are connected through the U-shaped connecting piece. The concrete beam of the existing building concrete structure is connected to the U-shaped connecting piece through the through bolts, forming a primary shear connection as the first group of shear force transmission components. The concrete beam of the existing building concrete structure and the steel beam of the steel structure with braces are connected through the beam structure anchor bolts. The concrete beam of the existing building concrete structure and the U-shaped connecting piece are connected through the node structure anchor bolts, forming a secondary shear connection as the second group of shear force transmission components. The U-shaped connecting piece, node structure anchor bolts and through bolts are all rigid components; The side wall of the U-shaped connecting piece extends to the top end of the steel beam of the steel structure with braces and is fixedly connected to the top end, bottom end and / or side wall of the steel beam of the steel structure with braces.

2. The integrated renovation structure of the existing building according to claim 1, characterized in that, The steel structure with braces is a concentrically braced steel frame structure, a steel frame structure with load-bearing buckling restrained braces or a concentrically braced steel frame structure using concrete-filled steel tubes.

3. The integrated renovation structure of the existing building according to claim 1, characterized in that, The composite beams corresponding to the floor slab composite area are arranged in a grid pattern.

4. The integrated renovation structure of the existing building according to claim 1, characterized in that, The area of the floor slab composite area accounts for 40% - 60% of the floor area of the existing building.

5. The integrated renovation structure of the existing building according to claim 1, wherein The width of the composite area accounts for more than 40% of the floor plane width of the existing building.

6. The integrated renovation structure of the existing building according to claim 1, characterized in that, The substructure with braces is a load-bearing buckling restrained substructure with steel side frames.

7. The integrated transformation structure of the existing building according to claim 6, characterized in that, The substructure with braces includes a load-bearing buckling restrained brace, a brace connection section, a steel side frame hoop and a reinforced concrete composite layer; The load-bearing buckling restrained brace is set inside the steel side frame hoop through the brace connection section. The steel side frame hoop is connected to the existing building concrete structure through the reinforced concrete composite layer.

8. The integrated renovation structure of the existing building according to claim 1, wherein, The node also includes a pressing plate arranged in the vertical direction of the U-shaped connecting piece. The pressing plate is connected to the concrete beam of the existing building concrete structure through a single row of through bolts.

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