142 results about "Large earthquakes" patented technology

The invention belongs to the technical field of bridge construction, and particularly relates to a single-end movable tensioning self-resetting winding cable damper which comprises a first fixing end, a second fixing end, a third fixing end and a fourth fixing end. The fixed end II is fixed with the top of the pier; one end of the tying part is fixedly connected with the first fixing end, the other end of the tying part is connected with the second fixing end through an elastic limiting assembly, and the elastic limiting assembly is matched with the second fixing end in an elastic limiting mode. During use, under the action of normal temperature load and vehicle load, slippage between the bridge and the pier can meet the small deformation requirement of normal use; under a small earthquake, relative displacement energy consumption between the movable pier and the beam can be utilized, and the earthquake response of the structure is reduced; under the action of a large earthquake, the first fixed end pulls the elastic limiting assembly to move through the pulling and connecting part, friction energy dissipation is conducted through the pulling and connecting part and the winding shaft, when displacement exceeds the elastic range, the elastic limiting assembly and the first fixed end are in limiting fit, and the relative displacement between the movable pier and the beam is prevented from being too large.

The invention discloses a method for automatically inverting seismic slip distribution based on deep learning. The method comprises the following steps: collecting random slip distribution corresponding to different seismic events and synthesized three-component seismic HR-GNSS waveform data, and preprocessing to obtain a sample group; building a SlipNet neural network based on a Transform-CNN model, and carrying out the training through the sample group; and inputting to-be-processed three-component seismic HR-GNSS waveform data into the trained SlipNet neural network, and generating a corresponding inverted seismic fracture area binary distribution matrix and an inverted seismic fracture slippage distribution matrix. The method solves the problem that a traditional seismic slip inversion method is low in calculation efficiency and lacks physical constraints due to single dependence on seismic waves or deformation data, and is difficult to meet the requirements of complex seismic source characterization. The method can be applied to three-component seismic HR-GNSS waveform data of large earthquakes of different types and different magnitudes.

The utility model relates to an enlarged type metal composite viscoelastic damper. The bottom of a metal damper is fixedly connected with an enlarged type viscoelastic damper. The metal damper comprises a T-shaped core plate, L-shaped restraining plates are fixedly connected to the two opposite sides of the T-shaped core plate in the vertical direction, friction areas are arranged between the tops, located on the vertical plane, of the L-shaped restraining plates and the T-shaped core plate, fixing areas are arranged between the bottoms of the L-shaped restraining plates and the T-shaped core plate, and energy dissipation webs are arranged on the portions, between the fixing areas and the friction areas, of the T-shaped core plate. The amplified viscoelastic damper comprises an upper connecting plate, an amplifying lever is hinged to the lower portion of the upper connecting plate, an inner steel plate is hinged to the lower portion of the amplifying lever, the inner steel plate is connected with an outer steel plate through a viscoelastic layer, and the outer steel plate is hinged to the amplifying lever through a fulcrum shaft. The defects of a metal damper can be overcome under small earthquakes, good energy consumption is achieved, the amplifying damper can be protected against excessive displacement and failure under large earthquakes, the damper consumes energy in a multi-stage mode, and the anti-seismic performance of the structure is improved. The components are connected through bolts, are highly assembled and are convenient to replace.

The double-step high-performance sealed viscous damping wall comprises a viscous damper and steel frames installed at the two ends of the viscous damper, the outer sides of the steel frames are fixedly connected with lug plates, embedded parts are arranged on the side walls of the lug plates, and the two ends of the viscous damper are hinged to the steel frames through gapless spherical hinges; the viscous damper comprises an oil cylinder, a piston and a piston rod, and the oil cylinder is filled with damping liquid; a variable cross-section structure is arranged on the inner wall of the oil cylinder, so that the middle circulation cross section is larger than the cross sections at two ends, and intelligent grading regulation of damping force along with piston displacement is realized; the invention belongs to the technical field of civil engineering damping walls, and achieves the technical effects that the groove is machined in the middle of the oil cylinder, a double-step energy dissipation mechanism is constructed, when a piston moves in the range of the groove, silicone oil can flow through double channels of the enlarged radial gap and the communicating hole, the piston moves to break through the boundary of the groove due to an earthquake, and the damping effect is achieved. And the gap between the piston and the oil cylinder is compressed instantly, so that the comfort under small earthquakes is guaranteed, and high-efficiency dissipation of pulse energy during large earthquakes is ensured.

The invention relates to the technical field of assembly type column base nodes, in particular to a high-bearing-capacity assembly type steel structure column base node which comprises an upper bottom plate, a lower bottom plate and a buckling-restrained energy consumption plate, an upper energy consumption plate is fixed to the bottom of the upper bottom plate, and a lower energy consumption plate is fixed to the top of the lower bottom plate. Buckling-restrained energy dissipation plates which are spaced left and right are fixed between the upper energy dissipation plate and the lower energy dissipation plate, and the upper bottom plate, the upper energy dissipation plate, the lower energy dissipation plate and the lower bottom plate are fixedly installed together through at least four extension anchor bolts with the lower ends pre-embedded in a foundation. The structure is reasonable and compact, and the rigidity and the bearing capacity of the joint are regulated and controlled by changing the thickness of the middle buckling-restrained energy consumption plates and the thickness of the inner energy consumption plates, so that the high bearing capacity performance target is achieved. Under the action of an ultra-large earthquake, the extension anchor bolt on the outermost side yields firstly, then yields the buckling-restrained energy dissipation plate, and finally yields the internal energy dissipation plate, so that a multi-stage energy dissipation system in a plastic stage is formed, and the anti-seismic property of the structure is effectively improved.

The invention discloses an urban agglomeration anti-seismic damage prediction method and system based on an unmanned aerial vehicle technology and a deep learning model. The method comprises the following steps: constructing a typical building multi-angle aerial image database and a building earthquake damage database under different load coupling effects; training an urban building group identification model based on the aerial photo database to identify the type, geometry and texture information of the building; constructing and training horizontal and vertical seismic oscillation amplification coefficient prediction models for correcting seismic oscillation intensities under different topographic conditions; a typical building earthquake damage prediction model is constructed and trained, and the building damage grade is predicted in combination with the corrected earthquake vibration intensity; and finally, realizing three-dimensional visualization of the damage condition of the urban building group through a damage grade imaging module. According to the method, the problems of inaccurate urban building group modeling information, large earthquake damage analysis workload and low precision in the prior art are solved, and a scientific basis is provided for construction and evaluation of tough cities.

The invention discloses a multi-stage assembly type viscoelasticity-metal toughness damper and a vibration reduction method, and belongs to the technical field of engineering structure vibration reduction. The damper comprises a viscoelastic damper unit, a metal damper unit and an SMA self-resetting unit. The viscoelastic damper unit is composed of a constraint steel plate and a viscoelastic material layer which are laminated, and the two ends of the viscoelastic damper unit are connected with the first connecting plate and the second connecting plate correspondingly. The metal damper unit comprises outer restraining plates arranged on the two sides of the viscoelastic unit and metal energy dissipation webs connected between the outer restraining plates and the connecting plates. The SMA self-resetting unit comprises a force transmission steel plate, a stress steel plate and an SMA component. According to the damper, the viscous-elastic material is used for shearing and dissipating energy under small shock or wind vibration, the SMA component provides reset force, and the metal web keeps elasticity; the metal webs conduct buckling energy dissipation under medium earthquakes or large earthquakes and work in cooperation with the viscoelastic units and the SMA units, the energy dissipation capacity is remarkably improved, and residual deformation is controlled. The device has the advantages of multi-stage collaborative energy consumption, good self-resetting performance, assembling capability and easiness in maintenance.

The invention provides a two-stage self-resetting friction energy dissipation damper. The two-stage self-resetting friction energy dissipation damper comprises a sliding friction energy dissipation system and a pre-pressing self-resetting system. The sliding friction energy dissipation system comprises an outer friction plate and an inner friction plate; the outer friction plates are vertically arranged in pairs, a first-stage sliding interface and a second-stage sliding interface with different inclination angles are arranged on the inner sides of the outer friction plates, and a gap area or a horizontal platform used for controlling conversion of sliding stages is arranged between the two interfaces; the two inner friction plates are symmetrically arranged between the two outer friction plates, and the surfaces of the inner friction plates are provided with double-section slope structures corresponding to the outer friction plates. Two sections of friction slopes with different inclination angles are designed on the inner friction plate and the outer friction plate, and switching of sliding stages is controlled through a preset gap; only the small-inclination-angle inclined plane is activated in a small earthquake, and mild energy consumption is achieved; the large-inclination-angle inclined plane is triggered in a large earthquake, and the friction force and the energy dissipation capacity are remarkably improved; and meanwhile, the single activation threshold limitation of a traditional damper is broken through, the multi-intensity seismic oscillation requirement is met, and the defects that small earthquakes do not work and large earthquakes are insufficient are overcome.

The purpose of the present invention is to provide a method for synthesizing the acceleration waveform of a destructive earthquake at a fixed station. The method relies on the empirical Green's function method, firstly obtains a relatively accurate source model and source parameters by synthesizing the acceleration time history of a strong motion instrument, and then uses the obtained source model and source parameters in the simulation of the large earthquake acceleration waveform at a broadband seismograph, and uses the small earthquake waveform recorded by the broadband seismograph as the Green's function to synthesize the large earthquake acceleration waveform at the broadband seismograph.

The invention discloses a real-time fracture characteristic parameter estimation method based on active fault data, and belongs to the technical field of earthquake early warning. The method comprises the steps of receiving and processing strong vibration data in real time; carrying out identification and binarization processing on a fracture near-field area of the observation seismic oscillation field; constructing a general fault fracture template library; dynamically generating a specific fault fracture template library in real time; virtual stations are introduced into a station network sparse area and an edge area, and an observation blind area is complemented through weighted fusion of an actual observation value and a GMPE predicted value; performing correlation matching on the real-time strong vibration observation data and a fault fracture template, and searching an optimal template; and outputting the current fault fracture characteristic parameters based on the optimal matching template. According to the method, the existing active fault database is adopted to dynamically generate the fracture template to process the known fault fracture caused by the active fault, and the universal template is utilized to process the unknown and hidden fault fractures, so that the accuracy of real-time estimation of the seismic motion field in the great earthquake fracture process is remarkably improved.

This invention discloses a shock-absorbing and pressure-reducing permeable concrete pile reinforced with recycled tires and its construction process. The pile structure comprises a pile body formed by vertically connecting several precast permeable concrete columns; compressible rubber blocks containing permeable holes and ball joints are fixed between adjacent permeable concrete columns; a layer of non-woven fabric is wrapped around the permeable concrete pile to prevent soil from clogging the concrete holes; and a ring-shaped mesh skeleton structure made of recycled tire strips is used to wrap and fix the non-woven fabric around the pile. This invention, by comprehensively utilizing the permeable concrete columns, the ring-shaped mesh skeleton structure, and the compressible rubber blocks containing permeable holes and ball joints, can achieve pile stability under small seismic loads, prevent pile breakage under large seismic loads, and allow the pile to quickly return to its original position after the seismic load disappears, thus ensuring a comprehensive application effect of "unmoved by small earthquakes, unyielding in large earthquakes, and self-repairing after earthquakes."

The application is suitable for the technical field of structure engineering, and provides a structure adaptive limiting protection device.The device comprises: a support fixed on a lower end surface of a structure; a yoke with a vertical slot with an upper opening, one side of the yoke being fixed on an upper end surface of the structure through a connecting rod; the upper end surface of the structure is a lower side surface of a bridge beam body, and the lower end surface of the structure is an upper side surface of a bridge pier; or, the upper end surface of the structure and the lower end surface of the structure are upper and lower side surfaces of a structure for limiting in cooperation with an isolation layer in a building structure; a locking structure fixed on the upper end surface of the structure; a rotating disc and a disc shell, the top of the disc shell being provided with an opening corresponding to the position of the locking structure, the rotating disc being provided with a radial slot; an inner sliding block and an outer sliding block, the inner sliding block being connected with the radial slot through an extensible mechanism and being capable of sliding in the radial slot, the outer sliding block being rotatably connected with the inner sliding block and being capable of sliding in the vertical slot.The application can realize the dual functions of small displacement isolation without interference and large earthquake adaptive self-locking.

To absorb vibration when a large earthquake occurs and to suppress the accumulation of damages caused by small earthquakes.SOLUTION: A vibration control device comprises a frame body with at least two sides fixed to other pillars or cross members that make up a building, and a plurality of vibration control members installed in parallel within the frame body. When the building shakes, the frame body deforms and the neighboring vibration control members rub against each other as the frame body deforms, to control vibration. The vibration control device further comprises a deformation restriction mechanism that is provided in the frame body and that restricts deformation of the frame body until the building shakes by a predetermined amount or more.SELECTED DRAWING: Figure 5

This invention relates to the field of vibration control technology for civil engineering structures. It discloses a triaxial magnetorheological quasi-zero stiffness intelligent vibration isolation bearing for large-span spatial structures and its control method. The bearing includes a top plate and a bottom plate. A middle plate is fixed to the bottom of the horizontally stacked magnetorheological elastomer vibration isolation / vibration unit. A vertical magnetorheological quasi-zero stiffness vibration isolation / vibration unit is fixed to the bottom plate and slidably connected to the inner side of the middle plate. The control method uses sensors to collect the structural response in real time, identifying three operating conditions: high-frequency micro-vibration, low-frequency moderate vibration, and large earthquake safety. It automatically switches control modes to achieve coordinated adaptive control of vertical damping and horizontal stiffness and damping. This invention combines high static load-bearing capacity with low dynamic stiffness, enabling triaxial decoupling and multi-mode intelligent coordinated control, and is suitable for broadband vibration control of roof supports for large-span spatial structures.

The application discloses a novel assembled steel plate composite damping wall considering multistage stress and a design method, wherein the novel assembled steel plate composite damping wall is assembled by connecting steel plates, dumbbell-shaped weakened steel plates, force transmission steel plates welded with studs, concrete plates, L-shaped connecting angle steels and high-strength bolts. The novel assembled steel plate composite damping wall only bears the dumbbell-shaped weakened steel plates under normal use conditions and under small earthquakes, and the concrete plates provide out-of-plane constraints for the novel assembled steel plate composite damping wall; under medium earthquakes and large earthquakes, the external concrete plates start to bear loads, so that the assembled damping wall has sufficient rigidity and bearing capacity. The multistage stress characteristics can guarantee that the structure has good lateral resistance and bearing performance in different loading stages, fully play the mechanical performance of each component, and delay the damage of the structure under the action of earthquakes.

The present application relates to the technical field of bridge, in particular to a bridge anti-seismic method and structure with multi-stage ordered reset energy dissipation, which can activate each stage of anti-seismic mechanism according to the expected design order under a once-in-a-lifetime earthquake, and can ensure that the bridge adapts to different earthquakes with different performance states, has flexible isolation and self-resetting function under small earthquakes, can pass through directly without repair after the earthquake; has the function of sliding isolation and energy dissipation under medium earthquakes, the main components are not damaged after the earthquake, and only the T-beam reset and the quick replacement of the mild steel energy dissipation element are needed to restore the traffic; has the function of automatic anti-falling beam under a large earthquake, and changes the force transmission path of the bridge structure; under a once-in-a-lifetime earthquake, the bridge is converted from the isolation mode to the ductility mode, the plastic hinge of the pier column is used for hysteresis energy dissipation to resist the earthquake, the seismic potential of the bridge structure is excavated to the greatest extent, and the life safety is ensured.

The present invention discloses a composite staged energy dissipation anti-buckling restraint support, comprising a core plate, side plates are provided on both sides of the core plate, a viscoelastic layer is provided between each side plate and the core plate, multiple groups of strip-shaped movable holes are provided through the core plate, each strip-shaped movable hole group is composed of two strip-shaped movable holes symmetrically provided at both ends of the core plate, multiple groups of circular holes corresponding to the strip-shaped movable holes are provided through each side plate, each circular hole group is composed of two circular holes symmetrically provided at both ends of the corresponding side plate; the distance between the inner end points of the two strip-shaped movable holes in each strip-shaped movable hole group is smaller than the distance between the two circular holes in the corresponding circular hole group, and the center distance between the two strip-shaped movable holes in each strip-shaped movable hole group is larger than the distance between the two circular holes in the corresponding circular hole group. The present invention realizes staged energy dissipation through material composite to meet the energy dissipation requirements of building structures under the action of small earthquakes, medium earthquakes, large earthquakes, and super-large earthquakes.

The application discloses a combined energy dissipation and shock absorption device for high-speed railway bridges, which is arranged symmetrically on both sides of a seismic isolation bearing between a prefabricated pier column and a prefabricated bridge, and is connected with the prefabricated bridge and the prefabricated pier column through mounting members at the bottom and the top. The device comprises multiple groups of connecting members which are uniformly arranged between the mounting members, and a viscoelastic energy dissipation unit, a bending energy dissipation unit and a limiting shear plate energy dissipation unit which are sequentially arranged between adjacent connecting members from top to bottom. The adjacent connecting members are connected and fixed with the mounting members at the top of the prefabricated pier column and the lower side of the prefabricated bridge body respectively only through the bottom surface and the top surface. In a normal state, the seismic isolation bearing, the viscoelastic energy dissipation unit and the bending energy dissipation unit provide small rigidity to resist variable loads such as wind load and temperature effect, and the shear plate energy dissipation unit does not work. In a small earthquake, the viscoelastic energy dissipation unit and the bending energy dissipation unit provide small rigidity to resist horizontal seismic action. In a large earthquake, the limiting shear plate energy dissipation unit provides large rigidity to resist horizontal seismic action.

The application discloses a semi-hinged concrete column foot joint and a design method, and belongs to the technical field of building structure engineering, and solves the problems of large inclination stiffness and large earthquake action of the existing vehicle base. The column foot joint comprises a concrete base, a reinforced concrete column is arranged on the concrete base, a profile steel is arranged in the reinforced concrete column, the lower end of the profile steel is inserted into the concrete base, the upper end of the profile steel is flush with the bottom of an upper layer beam, a connecting bottom plate is arranged at the bottom of the profile steel, the connecting bottom plate is connected with the concrete base through anchor bolts embedded in the concrete base, a plurality of column foot longitudinal reinforcements and continuous composite rectangular spiral hoops are arranged in the column foot section of the reinforced concrete column, and a plurality of column top longitudinal reinforcements and composite hoops are arranged in the column top section of the reinforced concrete column. The semi-hinged concrete column foot joint and the design method effectively reduce the earthquake action and large chassis effect of the skirt building of the subway vehicle base.

The utility model provides a multi-stage energy consumption combined damping seismic mitigation and isolation support which comprises an upper seat plate and a lower seat plate, the lower seat plate is located above the upper seat plate, a plane sliding plate is arranged at the top of the lower seat plate, a middle plate is arranged at the top of the plane sliding plate, a curved surface groove is formed in the top of the middle plate, and the curved surface groove is located in the middle plate. And an annular groove is formed in the bottom of the upper seat plate. The upper seat plate, the double-curved-surface plate, the middle plate and the two spherical sliding plates form a double-curved-surface structure, and the multiple wave-shaped damping elements form a wave-shaped steel damping structure. When an earthquake occurs, the device can automatically adjust the working state according to different earthquake magnitudes. In a small earthquake, a primary energy consumption mechanism of the double-curved-surface structure is utilized; when a large earthquake occurs, the lower shear pin is cut off, the wave-shaped steel damping structure is activated, and the wave-shaped steel damping structure and the hyperboloid structure work cooperatively, so that larger damping force output is achieved, displacement caused by the earthquake is effectively controlled, the earthquake response of structures such as bridges and buildings is remarkably reduced, and the safety of a main body structure is protected.

The invention relates to the technical field of dampers, in particular to a displacement damper based on a double-step yield section and an installation method thereof.The displacement damper comprises two first installation plates and further comprises a damping assembly, the damping assembly comprises a first core plate symmetrically installed between the two first installation plates, and two first side plates are symmetrically installed on the two sides of the first core plate; a second core plate is fixedly mounted on the side, away from the first core plate, of the first mounting plate, and two second side plates are symmetrically mounted on the two sides of the second core plate; and the connecting assembly is used for installing the damping assembly between two wall bodies. The damper yield section is divided into two sections, the part with the small section yields under small earthquakes, large rigidity can be achieved, the large section also enters the yield stage under large earthquakes, and second-order yield and large design displacement are achieved. And secondly, the connecting assembly is arranged between the node plate and the lug plate, rapid connection is conducted through the locking block on the insertion pipe, the installation distance is adjusted through rotation, and meanwhile disassembly is convenient.

The application belongs to the technical field of structural engineering and relates to a damage deformation controllable composite column-concrete beam fabricated node and a mounting method, which comprises a steel pipe concrete composite column, a prefabricated concrete beam and a self-resetting energy dissipation structure. The surface of the composite column is provided with a connecting plate and a second hinged plate, and the end of the prefabricated concrete beam is provided with an H-shaped steel and a second hinged plate, which are hinged through a pin shaft. A friction energy dissipation component is arranged between the first and second hinged plates and is used for friction energy dissipation under small earthquakes. The two ends of a plastic energy dissipation plate and a super-elastic reset plate are respectively detachably connected with the connecting plate and the H-shaped steel and are respectively used for plastic energy dissipation under medium earthquakes and super-elastic reset after earthquakes. The node is cooperated with multi-stage energy dissipation and self-resetting, realizes no damage under small earthquakes, repairable under medium earthquakes and no collapse under large earthquakes, is easy to replace after earthquakes and is suitable for high-intensity region fabricated buildings.

To provide a shelter for protecting a body only at the time of a big earthquake without becoming an obstacle at the time of daily life.SOLUTION: As a horizontal metal thin plate, a long side 11 of a rectangular main plate 1 is set as a longitudinal direction, and a short side 12 is set as a width direction. Both side ends in the longitudinal direction are provided with end part raising parts 2, 2 formed of the same material as the rectangular main plate 1 and held at the same angle in a downward inclined shape toward the outside with the horizontal line of the metallic thin plate as a reference, and a tension string-like object 4 is tied between both opposed end part raising parts 2, 2. The rectangular main plate 1 is formed in a flat shape in an ordinary time, and in a large earthquake, the tension string-like object 4 is properly shortened by tensile force by human power or motive power, and the rectangular main plate 1 is formed and fixed in a curved shape in the whole longitudinal direction, and the end part raising parts 2 and 2 are formed in a vertical shape, and can be formed as the body shelter.SELECTED DRAWING: Figure 1

To provide a beam-vertical member joint structure, which is essential for wooden buildings, and has excellent earthquake resistance and durability against major earthquakes, for example, earthquakes of magnitude 6 or more. [Solution] A cross member-vertical member joint structure in a rectangular frame consisting of upper and lower wooden cross members and wooden vertical members, which are columns sandwiched between these cross members, or in the joint structure of a frame body with wooden diagonal members arranged between them, in which the surfaces of the vertical member joints and the surfaces of the cross members have a polyurethane resin layer that, after hardening, has a tensile strength of 30 MPa or more and a tensile elongation of 100% or more.

The utility model discloses a buckling-restrained brace and belongs to the field of constructional engineering, the buckling-restrained brace comprises a steel brace inner core and a constraint steel member, a sliding groove is formed in the inner wall of the steel brace inner core, a sliding block is slidably connected to the inner wall of the sliding groove, a connecting lug is fixedly mounted on the outer side of the sliding block, and adjusting springs are fixedly connected to the upper side and the lower side of the sliding block; a bolt is fixedly mounted at the bottom of the constraint steel member; by arranging the steel support inner core and the constraint steel member, the double functions of a common support and a metal damper are combined, under the action of medium earthquake, the structural earthquake force is remarkably reduced, the design internal force of each main anti-seismic member is correspondingly reduced, and therefore the section size of each anti-seismic member can be correspondingly optimized and adjusted, and the anti-seismic performance is improved. The main anti-seismic component can still meet the anti-seismic performance index of middle-seismic elasticity, under the action of large earthquakes, the steel support inner core yields to dissipate energy, plastic hinges appear on part of beam components, plastic hinges do not appear on column components basically, and the requirement that falling does not occur in the large earthquakes is met.

The utility model discloses a damping type radial spherical plain bearing node which comprises a support base plate, a first lug plate and a second lug plate are fixedly installed at the two ends of the support base plate respectively, and a pin shaft is installed between the first lug plate and the second lug plate. A viscous damping mechanism, a bearing mechanism, a third lug plate and a spring mechanism are sequentially and tightly arranged on the pin shaft in a sleeving manner; the viscous damping mechanism is arranged between the first lug plate and the third lug plate, the bearing mechanism is rotationally installed in a lug hole of the third lug plate, and the spring mechanism is arranged between the second lug plate and the third lug plate. The shock absorption type radial spherical plain bearing node has the advantages of universal rotation, clear stress, simplicity in manufacturing and mounting, small node size and the like while solving the problems of temperature stress and earthquake action, and solves the problems of large temperature stress, large earthquake response, large node size and the like of the existing super-long and large-span space steel structure; wide popularization and application prospects are realized.

The invention discloses a multi-gradient energy consumption type transmission tower anti-seismic connection reinforcing node, and relates to the technical field of transmission project anti-seismic, the multi-gradient energy consumption type transmission tower anti-seismic connection reinforcing node comprises a transmission tower body and a transmission tower cross arm arranged on the transmission tower body, and four composite energy consumption devices are arranged on the connection node of the transmission tower body and the transmission tower cross arm. A composite steel strand assembly is arranged between the two composite energy dissipation devices arranged diagonally, and each composite energy dissipation device comprises a friction unit and a viscous unit arranged on the outer side of the friction unit. A three-stage energy dissipation mechanism of center steel strand force bearing, peripheral memory alloy wire energy dissipation and friction-viscous composite damping is adopted, earthquake energy is consumed step by step through memory alloy wire hyperelastic deformation, friction plate sliding and viscous damper rigid limiting, broadband loads are covered, large earthquake displacement is limited, a main body structure is effectively protected, and the service life of the device is prolonged. The method is suitable for anti-seismic reinforcement of power transmission lines in earthquake-prone areas.

The application discloses a replaceable coupling beam shear wall structure design method, comprising the following steps: S1, determining an overall structure performance target; S2, determining a yield section replaceable coupling beam arrangement scheme; S3, yield section replaceable coupling beam stiffness calculation; S4, non-yield section connecting beam and pre-embedded steel strength checking; checking yield section replaceable coupling beam bending resistance or shear resistance; S5, checking yield section replaceable coupling beam stability; S6, designing a connecting mode between the yield section replaceable coupling beam and the non-yield section connecting beam; S7, setting a yield section replaceable coupling beam restoring force model and a yield displacement; S8, performing structure elastic-plastic analysis; and S9, checking structure performance. The replaceable coupling beam can deform plastically and dissipate energy under large seismic action, and the residual deformation can be controlled; the inter-story drift angle is smaller than that of a traditional structure; and the replaceable coupling beam can be replaced quickly after an earthquake by adopting detachable connection, so that the structure function can be recovered quickly and completely.

The application discloses a large-span arch bridge grading damping mechanism and a grading damping method. The large-span arch bridge grading damping mechanism is detachably installed between a main beam and a pier, a support is installed between the main beam and the pier, a gap is formed between the main beam and the pier, the large-span arch bridge grading damping mechanism is located in the gap, and two ends of the large-span arch bridge grading damping mechanism are detachably installed at the bottom of the main beam and the top of the pier. The large-span arch bridge grading damping mechanism comprises a damper and damping material, and the damping material is placed in a container. The container is a barrel-shaped structure with an opening at one end. Correspondingly, the opening faces the top of the pier or the bottom of the main beam. The damper is oppositely arranged with the container, and one end of the damper is correspondingly detachably installed at the top of the pier or the bottom of the main beam. The other end of the damper extends into the damping material through the opening. The large-span arch bridge grading damping mechanism disclosed by the application can realize three-stage damping energy dissipation, is easy to repair and reusable after a small earthquake, is easy to disassemble and replace after a large earthquake, and has the advantages of simple structure and convenient installation.

The invention discloses an anti-falling connecting device for an assembly type stair and a mounting platform, and aims to provide an anti-falling connecting device for an assembly type stair and a mounting platform, which can enable a connecting node of the assembly type stair and the mounting platform to have sliding capacity under the condition that normal use of the assembly type stair is not influenced. Therefore, the adverse effects of earthquake or wind load and the like on the connecting node of the fabricated stair and the mounting platform and a building main body structure are effectively reduced; and meanwhile, the anti-falling connecting device further has the function of preventing the stairs from falling off under the action of a large earthquake. The connecting device comprises a main connecting assembly and an auxiliary connecting assembly. The main connecting assembly comprises a connector cylinder part which is pre-buried in the assembly type stair; the fixed outer cylinder is pre-embedded in a platform beam of the mounting platform; the sliding inner cylinder is arranged in the fixed outer cylinder in a sliding mode, and the sliding inner cylinder is inserted into the connector cylinder piece under the action of the end spring; the auxiliary connecting assembly comprises a sliding anchor head which is arranged in the sliding inner cylinder in a sliding manner; the connecting piece is fixed in the interface cylinder piece; the steel rope is connected with the sliding anchor head and the connecting piece.