218 results about "Large earthquakes" patented technology

To provide a reinforcement structure of an existing shield tunnel and a reinforcement method of the existing shield tunnel, which can suppress falling of concrete of the existing shield tunnel in the tunnel during a large scale earthquake at low cost by efficiently reinforcing a portion of a tunnel cross section, at which generated sectional force becomes strong.SOLUTION: A reinforcement structure of an existing shield tunnel 1 is provided on the existing shield tunnel 1 having a circular cross section built with segments 10 and reinforces by coating a portion of a concrete C exposed to a tunnel inner surface. A coating reinforcement member 11 is provided so as to cover at least a portion of tunnel inner surface 10a in at least either one of first reinforcement ranges D1 of 30° to 60° and -30° to -60° from a tunnel top portion P0 in a tunnel circumferential direction X1.SELECTED DRAWING: Figure 3

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 earthquake large model construction method, device and equipment based on a computer vision algorithm. The method comprises the following steps: acquiring label seismic data; extracting profile data in the tag seismic data to obtain multiple groups of profile data; randomly selecting at least one preset mode to mask the plurality of groups of profile data, and constructing a plurality of groups of mask profile samples; based on self-supervised learning, respectively inputting the plurality of groups of mask profile samples into a plurality of pre-constructed computer vision algorithm models for training to obtain a plurality of base models; and fusing the plurality of base models based on an attention mechanism, and constructing a large earthquake model. According to the method, features of different dimensions in seismic data are extracted by using different computer vision algorithms, and the features are fused based on an attention mechanism, so that the constructed large seismic model can obtain more comprehensive and accurate feature representation, and the large seismic model with high calculation precision and strong generalization ability is constructed. And the accuracy and timeliness of intelligent identification of the seismic section are 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 relates to a staged self-adaptive damping device for the longitudinal bridge direction of a beam bridge, and belongs to the technical field of civil engineering energy dissipation and damping. The damping device is mainly composed of connecting components (including six types of sub-components), energy consumption components (including two types of sub-components) and reset components, the energy consumption components and the reset components are embedded in the sub-connecting components, and the three types of components are matched with one another to form the damping device. The damping device adopts a staged and self-adaptive design concept, that is, the whole device provides rigidity for the structure under a small earthquake, the two types of sub-energy-dissipation components provide energy dissipation ways for the middle earthquake stage and the large earthquake stage respectively, and the self-adaptive threshold value of the device is determined by the length of a transverse long circular hole in a sub-connecting device. The staged self-adaptive damping device for the longitudinal bridge direction of the beam bridge is novel in structural design, reasonable in reset mode, convenient and fast in engineering installation and good in application prospect.

The invention provides a broadcast ephemeris-based high-frequency GNSS PGV (Global Navigation Satellite System) surface wave magnitude fast reporting method and equipment, which support the realization of high-frequency GNSS surface wave magnitude fast reporting by only using real-time available broadcast ephemeris and high-frequency GNSS observation data, and a receiver of a high-frequency GNSS observation station acquires the high-frequency GNSS observation data and the broadcast ephemeris in real time and sends the high-frequency GNSS observation data and the broadcast ephemeris to a ground computing center; the ground calculation center calculates the speed of the station in real time according to the observation data and the broadcast ephemeris, and judges earthquake triggering according to a continuous four-epoch judgment criterion; if the station triggers the earthquake, calculating the magnitude of the PGV surface wave; and when at least three stations trigger an earthquake, calculating a weighted average value based on the PGV surface wave magnitude of each station, and sending the weighted average value to an earthquake early warning center. According to the scheme, earthquake triggering is judged according to the continuous four-epoch judgment criterion, the engineering application performance of the PGV surface wave magnitude method is improved, and accurate earthquake magnitude information is provided for large earthquake early warning, rapid post-earthquake disaster assessment, emergency response and the like.

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.

The invention provides a gravity dam anti-seismic capacity analysis method considering an anti-seismic reinforcement reinforcement effect. The gravity dam anti-seismic capacity analysis method comprises the steps that a gravity dam cross-joint reinforcement reinforcement model is constructed; the gravity dam joint-crossing reinforcing steel bar model comprises a dam body concrete structure, a crack structure and reinforcing steel bars penetrating through the crack structure to be reinforced. Determining the optimal value of the physical and mechanical parameters of the dam body concrete structure by using an inverse analysis method and combining an iterative optimization algorithm; the optimal values of the physical and mechanical parameters of the dam body concrete structure serve as initial parameters of the gravity dam cross-joint reinforcing steel bar model; and seismic acceleration is applied to the gravity dam joint-crossing reinforcing steel bar model, the multiple of the seismic acceleration is gradually increased, and anti-seismic simulation analysis is carried out. According to the gravity dam anti-seismic capacity analysis method considering the anti-seismic reinforcement reinforcement effect, the anti-seismic capacity of the gravity dam with cracks after anti-seismic reinforcement reinforcement can be accurately analyzed.

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

The utility model discloses a low-cost shearing-rolling rubber shock insulation support which comprises an inner support body, an outer support body, an upper bolt and a lower bolt, the upper bolt and the lower bolt are embedded in an upper buttress and a lower buttress respectively, when a small earthquake occurs, the upper bolt and the lower bolt drive the support body to be subjected to shearing deformation to consume earthquake energy, and when a large earthquake occurs, the upper bolt and the lower bolt drive the support body to be subjected to rolling deformation to consume earthquake energy. The support can roll to a certain extent besides shear deformation, the horizontal rigidity of the shock insulation layer is further reduced, the earthquake action is reduced, and therefore the aim of effectively isolating or weakening the earthquake action in stages under the two mechanisms is achieved, and the structure is protected against earthquake damage is achieved. The shearing-rolling rubber shock insulation support can meet the requirements for reliability, stability and safety of low houses in villages and towns under the action of earthquakes; the utility model has the characteristics of simple structure, short production cycle, low cost, lightness and convenience, is convenient to construct and transport, and has wide application prospect.

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 invention discloses an anti-seismic building shaping base device, and relates to the technical field of anti-seismic buildings. Comprising a trapezoidal foundation frame, the trapezoidal foundation frame can be placed in the ground, the inner wall face and the outer wall face of the trapezoidal foundation frame have inclined radians, the upper portion of the inner wall face of the trapezoidal foundation frame is connected with a plurality of first anchor chains, and the lower ends of the first anchor chains are connected with first suspended dampers; the inner wall face and the outer wall face of the first suspended damper have inclined radians, and a plurality of second anchor chains are connected to the upper portion of the inner wall face of the first suspended damper. The anti-seismic building body base is designed and can be used for any building, through connection of the dampers, the anchor chains and the steel wire ropes, multiple damping functions are achieved, the good anti-seismic effect is achieved on sudden large earthquakes, the anti-seismic effect of the building is not affected no matter where seismic waves strike, practicability is high, and the anti-seismic building body base can be used for any building. The economic cost is not high, and the method is suitable for popularization and application.

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 invention discloses an earthquake large model construction method, device and equipment based on self-supervised learning. The method comprises the following steps: acquiring label seismic data; extracting profile data in the tag seismic data to obtain multiple groups of profile data; randomly selecting at least one preset mode to mask the plurality of groups of profile data, and constructing a plurality of groups of mask profile samples; based on self-supervised learning, respectively inputting the plurality of groups of mask profile samples into a plurality of pre-constructed neural networks for training to obtain a plurality of base models; and fusing the plurality of base models based on a full connection layer, and constructing a large earthquake model. According to the method, a large amount of unmarked seismic data is fully utilized, self-supervised learning is carried out on the seismic data, the whole method improves the development efficiency of an intelligent model in the seismic field, the model precision is higher, the robustness is higher, and the large seismic model which is high in calculation precision, good in accuracy, high in generalization ability and high in interpretation is constructed.

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 present invention relates to a displacement amplification type self-resetting friction damper, which converts the axial deformation of the damper into the rotation of the friction disk through gear transmission. The friction device rubs on the edge of the friction disk, thereby realizing the amplification of displacement, so as to reduce the need for friction force and extend the service life of the friction parts. At the same time, through gear transmission, the friction force provided by the friction device can increase with the increase of relative displacement, and can provide appropriate energy dissipation capacity under different working conditions. In addition, the device can automatically return to the initial state through the disc spring, and provide a certain self-resetting ability for the structure, which is beneficial to reduce the residual deformation of the structure under large earthquakes. Compared with the prior art, the present invention has good energy dissipation effect and is suitable for vibration control of engineering structures; the structure is stable and reliable and is not affected by the environment; it saves materials and reduces the consumption of friction plates; it is easy to maintain without dismantling the entire device.

The invention provides a high-intensity earthquake area bridge and a construction method and a post-earthquake repairing method thereof.The bridge comprises a main beam, a cover beam, a pier column and a pile foundation which are sequentially connected from top to bottom, and the pier column comprises an upper connecting section, a middle main body section and a lower connecting section which are sequentially connected in the vertical direction; the upper connecting section comprises a first central bearing column, a first shape memory alloy layer, a first tubular ductile section positioned in the plastic hinge area, and a first annular steel plate and a second annular steel plate which are connected to the peripheral wall of the first central bearing column; the lower connecting section comprises a second central bearing column, a second shape memory alloy layer, a second tubular ductile section located in the plastic hinge area, a third annular steel plate and a fourth annular steel plate, wherein the third annular steel plate and the fourth annular steel plate are connected to the peripheral wall of the second central bearing column. The method can economically and reasonably realize the design goals of no damage in small earthquakes, repairable in medium earthquakes and no falling in large earthquakes.