A replaceable node with two lines of defense

Abstract

The application discloses a replaceable node with double defense lines, which comprises a corrugated steel pipe, a steel pipe assembly penetrating through the inside of the corrugated steel pipe and located outside the corrugated steel pipe at the left end, a baffle assembly fixedly connected with the left and right ends of the steel pipe assembly and used for fixing the steel pipe assembly and the corrugated steel pipe with a beam segment, and the right end of the corrugated steel pipe is fixedly connected with the baffle assembly; the rigidity of the steel pipe assembly guarantees that the beam segment meets normal use requirements; the corrugated steel pipe serves as a temporary force transmission structure after the steel pipe assembly is damaged to increase the ductility deformation capacity of the node; the rigidity of the steel pipe assembly located inside is controlled to guarantee that the beam segment meets normal use requirements, and the plastic hinge is effectively controlled to move to the node; the corrugated steel pipe located outside serves as a temporary force transmission structure after the steel pipe assembly located inside is damaged, the corrugated steel pipe has good deformation capacity, the ductility deformation capacity of the node can be increased under the action of an earthquake, and the structure is protected from collapsing or the collapsing time is prolonged under the action of the earthquake.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building structures, and particularly relates to a replaceable node with two lines of defense. BACKGROUND

[0002] Steel structure engineering is widely used in the construction industry due to its light weight, high strength, good plasticity and toughness, and high degree of mechanization in manufacturing and installation. In recent years, as the service life of building structures is longer, the probability of being subjected to accidental loads (such as earthquakes, fires, explosions, impacts, etc.) is correspondingly increasing, and the probability of structural member damage or failure is also significantly increasing. If the node is damaged prematurely, the structure will not be able to play a major role in resisting progressive collapse damage. Therefore, the node has sufficient strength and deformation capacity, which is an important guarantee for the beam-column connection node not to occur progressive collapse damage.

[0003] The seismic design code for building structures requires that the node have sufficient ductility to meet the deformation requirements of the structure under seismic action so as not to occur brittle failure. The existing beam-column connection is welded, and the connection position is prone to brittle failure, so measures need to be taken to prevent the node from producing brittle failure. The current improved connection methods are as follows: 1. Cover plate connection: strengthen the beam end to realize the strong node design concept; 2. Expand the beam end flange: expand the flange, increase the contact area of the beam end and the column, and protect the beam end from premature damage; dog bone connection: weaken the beam section to realize the plastic hinge migration, so that the node produces plastic failure; the disadvantages of the above connection methods are 1. Although the plastic hinge migration is realized to achieve plastic failure of the beam-column node, once the damage occurs, it does not have the second line of defense for seismic resistance; 2. The node is not easy to repair after damage, and the repair process is not economical (high cost).

[0004] Therefore, it is a known research problem to provide a replaceable node with two lines of defense that can play a role through the connection of the external corrugated steel pipe and the steel beam after the internal steel pipe is damaged. SUMMARY

[0005] The purpose of the present application is to provide a replaceable node with two lines of defense that can play a role through the connection of the external corrugated steel pipe and the steel beam after the internal steel pipe is damaged.

[0006] The purpose of the present application is achieved as follows:

[0007] The application discloses a replaceable node with double defense lines, which comprises a corrugated steel pipe, a steel pipe assembly which is arranged in the corrugated steel pipe and has a left end arranged outside the corrugated steel pipe, and a baffle assembly which is fixedly connected with the left end and the right end of the steel pipe assembly and is used for fixing the steel pipe assembly and the corrugated steel pipe to a beam segment, wherein the right end of the corrugated steel pipe is fixedly connected with the baffle assembly, the rigidity of the steel pipe assembly is used for guaranteeing that the beam segment meets normal use requirements, and the corrugated steel pipe serves as a temporary force transmission structure after the steel pipe assembly is damaged to increase the ductility deformation capacity of the node.

[0008] The steel pipe assembly comprises a first steel pipe arranged in the corrugated steel pipe and a second steel pipe which is fixedly connected with the left end of the first steel pipe through a connecting plate, and the wall thickness of the second steel pipe is greater than that of the first steel pipe.

[0009] The length of the first steel pipe is greater than that of the second steel pipe.

[0010] The left end of the second steel pipe is arranged outside the corrugated steel pipe, and the connecting plate and the right end of the second steel pipe are arranged inside the corrugated steel pipe.

[0011] The baffle assembly comprises a first baffle which is fixedly connected with the right end of the steel pipe assembly and the right end of the corrugated steel pipe, a second baffle which is fixedly connected with the left end of the steel pipe assembly, and a bolt assembly which is used for detachably connecting the left end of the steel pipe assembly to the second beam segment through the second baffle and the bolt assembly and detachably connecting the right end of the steel pipe assembly and the right end of the corrugated steel pipe to the first beam segment through the first baffle and the bolt assembly.

[0012] The application has the positive beneficial effects that the rigidity of the steel pipe assembly arranged inside is controlled to guarantee that the beam segment meets normal use requirements, the plastic hinge is effectively controlled to move to the node, the corrugated steel pipe arranged outside serves as a temporary force transmission structure after the steel pipe assembly arranged inside is damaged, the corrugated steel pipe has good deformation capacity, the ductility deformation capacity of the node can be increased under the action of an earthquake, the structure is protected from collapsing or the collapsing time is prolonged under the action of the earthquake, so that a certain escape time is provided for trapped personnel, the safety of people's lives and property is better protected, in addition, the node can be quickly replaced after being damaged, so that the node can be quickly put into use again, and economic losses are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The figure is a structural schematic diagram of the application;

[0014] Figure 2 The figure is a structural schematic diagram of the inside of the application;

[0015] Figure 3 The figure is a structural schematic diagram of the application when the application is connected with the first beam segment and the second beam segment;

[0016] In the figure, 1 is a corrugated steel pipe, 2 is a steel pipe assembly, 3 is a first baffle, 4 is a second baffle, 5 is a first beam segment, 6 is a second beam segment, 21 is a first steel pipe, 22 is a second steel pipe, and 23 is a connecting plate. Embodiments

[0017] The application is further illustrated in the following description with reference to the accompanying drawings and examples. Examples

[0018] As shown in Figure 1 and Figure 2 , a replaceable node with double-line defense includes a corrugated steel pipe 1, a steel pipe assembly 2 passing through the inside of the corrugated steel pipe 1 and located outside the corrugated steel pipe 1 at the left end, a baffle assembly fixedly connected with the left and right ends of the steel pipe assembly 2 and making the steel pipe assembly 2 and the corrugated steel pipe 1 fixedly connected with the beam segment, the right end of the corrugated steel pipe 1 being fixedly connected with the baffle assembly, the left end of the steel pipe assembly 2 being detachably connected with the second beam segment 6 through the baffle assembly, the right end of the steel pipe assembly 2 and the right end of the corrugated steel pipe 1 being detachably connected with the first beam segment 5 through the baffle assembly, the rigidity of the steel pipe assembly 2 ensuring that the beam segment meets the normal use requirements, in the normal use stage, the corrugated steel does not participate in force bearing, the external load is borne by the steel pipe assembly 2, and the use function is met; under the seismic action, the steel pipe assembly 2 forms a plastic hinge, the node deforms, the rigidity decreases, the replaceable node is replaced, and the medium earthquake repairable seismic performance target is realized; after the steel pipe assembly 2 is damaged under the rare earthquake, the corrugated steel pipe 1 and the steel beam are connected to play a role, the corrugated steel pipe 1 reduces the seismic response of the structure through its good deformation performance, prevents the structure from suddenly collapsing, and prolongs the collapse time of the structure.

[0019] The corrugated steel pipe 1 acts as a temporary force transmission structure after the steel pipe assembly 2 is damaged to increase the ductility deformation capacity of the node, the rigidity of the steel pipe assembly located inside is controlled to ensure that the beam segment meets the normal use requirements, and the plastic hinge is effectively controlled to move outside the node, the corrugated steel pipe 1 located outside acts as a temporary force transmission structure after the steel pipe assembly 2 inside is damaged, the corrugated steel pipe 1 has good deformation capacity, can increase the ductility deformation capacity of the node under the action of the earthquake, protects the structure from collapsing or prolongs the collapse time under the action of the earthquake, thereby providing a certain escape time for trapped personnel, better protecting the safety of people's lives and property, in addition, the node can be quickly replaced after being damaged, and the node can be quickly put into use again, thereby reducing economic losses.

[0020] The steel pipe assembly 2 comprises a first steel pipe 21 located in the corrugated steel pipe 1, a second steel pipe 22 fixedly connected with the left end of the first steel pipe 21 through a connecting plate 23, the left end of the first steel pipe 23 is welded and fixed with the right side of the connecting plate 23, the right end of the second steel pipe 22 is welded and fixed with the left end of the connecting plate 23, and the wall thickness of the second steel pipe 22 is greater than that of the first steel pipe 21. The length of the first steel pipe 21 is greater than that of the second steel pipe 22, the left end of the second steel pipe 22 is closer to the beam column, the left end of the second steel pipe 22 is located outside the corrugated steel pipe 1, the connecting plate 23 and the right end of the second steel pipe 22 are located inside the corrugated steel pipe 1, the wall thickness of the second steel pipe 22 is appropriately thickened, so that the damage position of the steel pipe assembly 2 under the action of an earthquake occurs inside the corrugated steel pipe 1, the external corrugated steel pipe 1 can be effectively connected with the steel beam, the external corrugated steel pipe 1 improves the ductility deformation capacity of the joint through its own good deformation capacity, prevents the sudden collapse of the structure under the action of an earthquake, prolongs the destruction time of the structure, and realizes the second line of defense under the action of an earthquake. Embodiment

[0021] As shown in Figure 1 and Figure 2 A replaceable joint with a second line of defense, comprising a corrugated steel pipe 1, a steel pipe assembly 2 passing through the inside of the corrugated steel pipe 1 and having a left end located outside the corrugated steel pipe 1, a baffle assembly fixedly connected with the left and right ends of the steel pipe assembly 2 and enabling the steel pipe assembly 2 to be fixedly connected with the corrugated steel pipe 1 and a beam segment, the right end of the corrugated steel pipe 1 being fixedly connected with the baffle assembly, the left end of the steel pipe assembly 2 being detachably connected with a second beam segment 6 through the baffle assembly, and the right end of the steel pipe assembly 2 and the right end of the corrugated steel pipe 1 being detachably connected with a first beam segment 5 through the baffle assembly, the stiffness of the steel pipe assembly 2 ensuring that the beam segment meets the normal use requirements, in the normal use stage, the corrugated steel pipe does not participate in force bearing, the external load is borne by the steel pipe assembly 2, and the use function is met; under the action of a fortification earthquake, the steel pipe assembly 2 forms a plastic hinge, the joint deforms, the stiffness decreases, the replaceable joint is replaced, the seismic performance target under a moderate earthquake is realized, and after the steel pipe assembly 2 is damaged under a rare earthquake, the corrugated steel pipe 1 and the steel beam are connected to play a role, the corrugated steel pipe 1 reduces the seismic response of the structure through its own good deformation performance, prevents the sudden collapse of the structure, and prolongs the collapse time of the structure.

[0022] The corrugated steel pipe 1 acts as a temporary force transmission structure to increase the ductility deformation capacity of the joint after the steel pipe assembly 2 is damaged, the rigidity of the steel pipe assembly inside is controlled to ensure that the beam segment meets the normal use requirements, and the plastic hinge is effectively controlled to move to the joint, the corrugated steel pipe 1 outside the steel pipe assembly 2 acts as a temporary force transmission structure after the steel pipe assembly 2 inside is damaged, the corrugated steel pipe 1 has good deformation capacity, can increase the ductility deformation capacity of the joint under the action of an earthquake, and protects the structure from collapsing or prolongs the collapse time under the action of an earthquake, thereby providing a certain escape time for trapped personnel, better protecting the safety of people's lives and property, in addition, the joint can be quickly replaced after being damaged, and quickly put into use again, thereby reducing economic losses.

[0023] The steel pipe assembly 2 comprises a first steel pipe 21 inside the corrugated steel pipe 1, a second steel pipe 22 fixedly connected with the left end of the first steel pipe 21 through a connecting plate 23, the left end of the first steel pipe 23 is welded and fixed with the right side of the connecting plate 23, the right end of the second steel pipe 22 is welded and fixed with the left end of the connecting plate 23, and the wall thickness of the second steel pipe 22 is greater than that of the first steel pipe 21. The length of the first steel pipe 21 is greater than that of the second steel pipe 22, the left end of the second steel pipe 22 is closer to the beam column, the left end of the second steel pipe 22 is located outside the corrugated steel pipe 1, the connecting plate 23 and the right end of the second steel pipe 22 are located inside the corrugated steel pipe 1, and the wall thickness of the second steel pipe 22 is appropriately thickened to ensure that the damage position of the steel pipe assembly 2 under the action of an earthquake occurs inside the corrugated steel pipe 1, the external corrugated steel pipe 1 can be effectively connected with the steel beam, the external corrugated steel pipe 1 improves the ductility deformation capacity of the joint through its good deformation capacity, prevents the sudden collapse of the structure under the action of an earthquake, prolongs the structure damage time, and realizes the second line of defense under the action of an earthquake.

[0024] The baffle assembly comprises a first baffle 3 fixedly connected with the right end of the first steel pipe 21 and the right end of the corrugated steel pipe 1 through welding, a second baffle 4 fixedly connected with the left end of the second steel pipe 22 through welding, and the left end of the second steel pipe 22 is detachably connected with the second beam segment 6 through the second baffle 4 and a bolt assembly. The right end of the first steel pipe 21 and the right end of the corrugated steel pipe 1 are detachably connected with the first beam segment 5 through the first baffle 3 and a bolt assembly. The first baffle 3 and the second baffle 4 facilitate quick replacement of the damaged beam segment, have high construction efficiency, and are convenient to operate. Meanwhile, the joint can be quickly replaced after being damaged, and quickly put into use again, thereby reducing economic losses.

[0025] The application controls the rigidity of the steel pipe assembly inside to ensure that the beam segment meets normal use requirements, effectively controls the plastic hinge to move to the joint, the corrugated steel pipe outside serves as a temporary force transmission structure after the steel pipe assembly inside is damaged, the corrugated steel pipe has good deformation capacity, can increase the ductility deformation capacity of the joint under the action of the earthquake, protects the structure from collapsing or prolongs the collapse time under the action of the earthquake, thereby providing a certain escape time for trapped personnel, better protecting the safety of people's lives and property, in addition, the joint can be quickly replaced after being damaged, and is quickly put into use again, thereby reducing economic losses.

Claims

1. A replaceable node with two lines of defense, characterized in that: The system includes a corrugated steel pipe, a steel pipe assembly passing through the interior of the corrugated steel pipe with its left end located outside the corrugated steel pipe, and a baffle assembly fixedly connected to both ends of the steel pipe assembly, thereby fixing the steel pipe assembly, the corrugated steel pipe, and the beam segment. The right end of the corrugated steel pipe is fixedly connected to the baffle assembly. The stiffness of the steel pipe assembly ensures that the beam segment meets normal usage requirements. After the steel pipe assembly fails, the corrugated steel pipe acts as a temporary force-transmitting structure to increase the ductility of the joint. The steel pipe assembly includes a first steel pipe located inside the corrugated steel pipe and a second steel pipe fixedly connected to the left end of the first steel pipe via a connecting plate. The wall thickness of the second steel pipe is greater than that of the first steel pipe. The left end of the second steel pipe is located outside the corrugated steel pipe, and the connecting plate and the right end of the second steel pipe are located inside the corrugated steel pipe. The baffle assembly includes components fixedly connected to the right end of the steel pipe assembly and the right end of the corrugated steel pipe. The first baffle is fixedly connected to the left end of the steel pipe assembly, the second baffle is fixedly connected to the left end of the steel pipe assembly, the left end of the steel pipe assembly is detachably connected to the second beam segment through the second baffle and bolt assembly, and the right end of the steel pipe assembly and the right end of the corrugated steel pipe are detachably connected to the first beam segment through the first baffle and bolt assembly. During normal use, the corrugated steel does not participate in the load-bearing, and the steel pipe assembly (2) bears the external load to meet the use function. Under the design earthquake action, the steel pipe assembly (2) forms a plastic hinge, the node deforms, and the stiffness decreases. By replacing the node, the seismic performance target of repairable under moderate earthquake is achieved. After the steel pipe assembly (2) is damaged under rare earthquake, the corrugated steel pipe (1) plays a role in the connection with the steel beam. The corrugated steel pipe (1) reduces the seismic response of the structure through its own good deformation performance, prevents the sudden collapse of the structure, and prolongs the time before the structure collapses.

2. The replaceable node with two lines of defense according to claim 1, characterized in that: The length of the first steel pipe is greater than the length of the second steel pipe.

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