17 results about "Progressive collapse" patented technology

The invention discloses a corrugated steel plate improved assembly type steel frame combination joint which comprises square steel pipes, a steel frame and a corrugated steel plate. The two groups of H-shaped steel beams are arranged, the adjacent H-shaped steel beams are detachably connected through connecting mechanism components, corrugated steel plates connected with the H-shaped steel beams through SMA bolts are arranged in the middles of the beam ends of the H-shaped steel beams located at the ends, corrugated steel plates connected with the H-shaped steel beams through welding are arranged on the two sides of the H-shaped steel beams through welding, and the corrugated steel plates and the side walls of the square steel tubes are fixed through welding; the side walls of the square steel pipes are located on the upper and lower sides of the end beams and are connected with gusset plates on the joint parts of the H-shaped steel beams through rotating assemblies connected with SMA rods; and when the SMA rod and the corrugated steel plate are damaged, a new force transmission path can be formed in a node area to prevent progressive collapse while the functions of shock absorption, energy consumption and self-resetting are achieved. Reinforcing pieces are arranged at the beam ends and comprise corrugated steel plates, and the corrugated steel plates are arranged at the connecting joints of the two H-shaped steel beams.

The present invention discloses a method for evaluating and optimizing the anti-progressive collapse performance of a cable dome structure. The evaluation method comprises the following steps: (1) obtaining, for each type of component, the displacement vector of the cable dome structure under load before and after the component is removed; (2) calculating its rate of change as an importance index of the component; (3) calculating the average importance index of all types of components as an evaluation index for the anti-progressive collapse performance of the cable dome structure; and (4) evaluating the anti-progressive collapse capability of the cable dome structure. The present invention introduces a component importance index to evaluate the importance of various types of components in the anti-progressive collapse of the structure, and uses its average value as a quantitative evaluation index for the anti-progressive collapse performance of the cable dome structure, which is reliable and effective. The evaluation method requires a small amount of calculation, does not require excessive external factor assumptions, and can be used in the optimization process of complex topological structures of cable domes.

The invention belongs to the technical field of anti-impact protection. According to the snail shell imitating square tube improved anti-impact energy absorption structure and the application, the structural monomers or the structural modular array can be used for dynamic load protection. Under the action of an axial compression load, the structure realizes a multi-layer and progressive collapse path, and has low initial peak crushing force and staged and approximately linear increasing force-displacement response characteristics. According to the bionic structure, the energy absorption efficiency of the rectangular pipe is effectively improved under the condition that the mass and the manufacturing complexity are not increased, and the bionic structure is suitable for vehicle anti-collision systems, rail transit buffer devices and other anti-impact protection fields.

The present invention discloses a wave - rising and grading energy - dissipating beam - column joint connection device and a connection method. The device is connected between a reinforced concrete precast column and a reinforced concrete precast beam. The reinforced concrete precast column is provided with a first shear - resistant steel plate and a number of precast column reserved steel bars, and the reinforced concrete precast beam is provided with a second shear - resistant steel plate and a number of precast beam reserved steel bars. The first shear - resistant steel plate and the second shear - resistant steel plate are arranged opposite to each other. The wave - rising and grading energy - dissipating beam - column joint connection device includes a connection steel plate, a first wave - rising longitudinal steel bar, a second wave - rising longitudinal steel bar, a first low - strength steel bar, a second low - strength steel bar and stirrups. The two connection steel plates are respectively arranged on both sides of the first shear - resistant steel plate and the second shear - resistant steel plate, and the connection steel plates are fixedly connected to the first shear - resistant steel plate and the second shear - resistant steel plate through pin bolts. The present invention has high construction efficiency, can achieve the "strong column - weak beam" yield mechanism, can dissipate energy in stages, has excellent anti - progressive collapse performance, and can be repaired after an earthquake.

The application provides a beam-column substructure anti-continuous collapse dynamic test device, which comprises a supporting unit, a control unit and a bearing seat, the supporting unit comprises a plurality of supporting assemblies arranged at intervals, the control unit comprises a plurality of control assemblies arranged in one-to-one correspondence with the supporting assemblies, the control assemblies are rotationally connected to the supporting assemblies, and the control assemblies rotate around their own axes; the bearing seat is connected to the control unit; the control assembly has a supporting state of providing a supporting force for the bearing seat and a collapse state of rotating around its own axis to make the bearing seat fall. The beam-column substructure anti-continuous collapse dynamic test device provided by the application aims to solve the problems that the static test in the prior art cannot truly reflect the influence of the dynamic characteristics after the sudden failure of a column on the structural performance, and that the impact test is inconvenient to operate in a laboratory.

The utility model relates to the technical field of buildings, in particular to a frame column conversion structure capable of improving safety redundancy, which is characterized in that the bottom end of an inclined strut is fixedly connected with a lower-layer structural column, the top end of the inclined strut is fixedly connected with the bottom of an upper-layer structural column, and the included angle between the inclined strut and the lower-layer structural column is 10-30 degrees; the top end of the lower-layer structural column extends to a bottom floor beam plate of a retracting layer at the upper-layer structural column, the connecting point of the inclined strut and the lower-layer structural column is a lap joint, the lap joint is located below an upper conversion layer of the lower-layer structural column to form a triangular core area, and the inclined strut extends upwards in an inclined mode to penetrate through the upper conversion layer of the lower-layer structural column. The floor beam plate penetrates through the inclined struts, the vertical structure columns and the interior of the triangular core area. The whole structure is short in force transmission path, simple in stress, small in earthquake effect and capable of effectively preventing progressive collapse. And the structure is small in occupied space, and the used building space is square. The profile steel is arranged inside as required, ductility is good, and bearing capacity is high.

The invention provides a tough anti-seismic check block structure based on a gradual buckling steel sleeve, and belongs to the technical field of bridge seismic resistance. The reinforcing rings, the thin-wall rings and the reinforcing rings are sequentially arranged on the periphery of the gradually-bent steel sleeve, and when the gradually-bent steel sleeve is subjected to axial pressure, the multiple thin-wall rings are sequentially subjected to radial bulging, so that energy consumption is achieved. And after the anchor bolt penetrates through the gradual buckling steel sleeve, the check block and the pre-buried bolt sleeve are fixed, and then the novel tough anti-seismic check block which has a stable plastic mode and is easy to repair after an earthquake is formed. According to the check block structure, energy dissipation is conducted only by means of the fact that the gradually-buckling steel sleeve is pressed, the displacement of the gradually-buckling steel sleeve is further amplified by means of the lever principle, the check block and the check block body keep elastic, recovery can be achieved only by replacing a new anchoring element after an earthquake, and therefore the remarkable toughness advantage is achieved.

The invention relates to the technical field of steel frame beam-column joints, in particular to a steel frame beam-column joint structure with improved progressive collapse resistance, which comprises a support column, mounting mechanisms are arranged on both sides of the support column, and a plurality of steel structure support frames are sequentially arranged on both sides of the support column. Through detachable connection between every two adjacent steel structure supporting frames and detachable connection between the steel structure supporting frames and the supporting stand columns, the connection firmness is fully guaranteed, meanwhile, when collapse occurs, the covered range can be reduced, the problem of continuous collapse is avoided, and the service life of the steel structure supporting frames is prolonged. Meanwhile, the two steel structure supporting frames can be fully clamped and fixed through the arc-shaped supporting plates, the two adjacent steel structure supporting frames can be connected through matching of the arc-shaped supporting plates and the arc-shaped supporting plates, connection firmness is ensured, and connection with the steel beams in the plane is completed through the connecting threaded holes.

The present invention discloses a corrugated steel tube node component of a steel structure that is resistant to earthquakes and progressive collapse, comprising a corrugated steel tube, a steel column and a steel beam; the corrugated steel tube comprises a first flat plate, a second flat plate, an SMA shape memory alloy plate and a corrugated plate, one end of the SMA shape memory alloy plate and one end of the corrugated plate are both fixed to the first flat plate, the other end of the SMA shape memory alloy plate and the other end of the corrugated plate are both fixed to the second flat plate, the first flat plate is fixed to the steel column, and the second flat plate is fixed to the steel beam. The component can effectively solve the problem of structural damage caused by insufficient earthquake resistance and progressive collapse resistance of traditional steel structure nodes.

The invention relates to the technical field of truss string beams, and discloses an anti-progressive-collapse carbon fiber inhaul cable truss string beam structure which comprises a main beam, a supporting rod arranged at the bottom of the main beam and a carbon fiber inhaul cable arranged on the supporting rod and further comprises a bearing part arranged at the bottom of the supporting rod and a protection assembly arranged in the bearing part. And the locking assembly is arranged on the protection assembly and used for locking the carbon fiber inhaul cable. According to the carbon fiber inhaul cable string truss girder structure resistant to progressive collapse, the pressure change can be monitored in real time through the pressure sensor, the real-time monitoring mechanism enables workers to know abnormal conditions in time, overhaul is rapidly arranged, potential risks are prevented from being further expanded, meanwhile, the electromagnets are powered on, the lower locking bases are pushed to move upwards through magnetic force, and the safety of the workers is improved. The broken carbon fiber inhaul cable is rapidly and automatically locked, continuous collapse accidents caused by breakage of the inhaul cable are effectively avoided, and the safety performance of the whole continuous collapse resisting carbon fiber inhaul cable string truss beam structure is greatly improved.

The utility model discloses a beam column joint anti-seismic reinforcing structure which comprises a reinforcing assembly connected to the connecting position of a longitudinal beam column and a transverse beam column, and the reinforcing assembly comprises two inclined supporting plates arranged in a crossed mode. The two ends of the inclined supporting plate are connected with a side connecting plate connected with the longitudinal beam column and an upper connecting plate connected with the transverse beam column respectively. The device has the beneficial effects that shear force and bending moment caused by earthquakes are effectively dispersed through the inclined supporting plates which are arranged in a crossed mode, connection with the longitudinal beam columns and the transverse beam columns is achieved through the side connecting plates and the upper connecting plates, force can be evenly distributed to the longitudinal beam columns and the transverse beam columns, and local stress concentration is avoided; according to the device, through the good damping effect of the reinforcing assembly, vibration energy can be effectively absorbed and dissipated, effective reinforcing and transformation of an existing node position are achieved, the node bearing capacity is improved, meanwhile, the node has the progressive collapse resisting capacity, and the anti-seismic capacity of the node is greatly improved.

The application relates to the technical field of steel frame beam-column joint, in particular to a steel frame beam-column joint structure with improved anti-continuous collapse performance, which comprises a supporting stand column, the two sides of the supporting stand column are both provided with mounting mechanisms, and the two sides of the supporting stand column are both sequentially provided with a plurality of steel structure supporting frames. The application is characterized in that the detachable connection between the adjacent two steel structure supporting frames and the detachable connection between the steel structure supporting frames and the supporting stand column can fully guarantee the connection firmness, and when collapse occurs, the range affected by the collapse can be reduced, the problem of continuous collapse can be avoided, the two steel structure supporting frames can be clamped and fixed through the supporting arc-shaped plates, the connection between the adjacent two steel structure supporting frames can be completed through the cooperation of the supporting arc-shaped plates and the supporting stand column, the connection firmness can be ensured, and the connection with the in-plane steel beam can be completed through the connecting threaded holes.

The application provides a method for evaluating the continuous collapse resistance of a locally prestressed concrete frame. Since the locally prestressed structure is generally asymmetric, the existing theoretical method is generally difficult to obtain a good prediction effect. The method for evaluating the continuous collapse resistance of the locally prestressed concrete frame is based on the basic parameters of the structure and the material, and is based on the assumed three-fold line limit state model. The displacement coordination and stress balance conditions of the substructure are utilized, and the influence of the plastic hinge area is considered. The method can better solve the difficulties caused by the geometric and physical asymmetry of the locally prestressed structure, and can obtain the reliable limit displacement and limit resistance of the locally prestressed concrete frame substructure. Further, the method can be used for evaluating the continuous collapse resistance of the structure.

The invention discloses a beam-through davit node for preventing progressive collapse in a weak-rigidity suspension structure, which is characterized in that a floor beam in a cantilever direction and a floor secondary beam perpendicular to the floor beam are prefabricated H-shaped steel beams, the floor beam in a suspension area is continuous, davits are layered and welded with the floor beam, and a stiffening rib I is arranged at the davit joint of each layer; the paired stiffening ribs I are symmetrically welded to the two sides of the davit in the floor beam direction. A web of the floor secondary beam is connected with a stiffening rib III of the floor beam, and a wing expanding plate is arranged at the joint of a flange of the floor secondary beam and the floor beam; and transverse stiffening ribs II are arranged on the floor beam web and are symmetrically distributed on the two sides relative to the davit. According to the method, stress is reasonable, reliability is high, progressive collapse can be effectively prevented, assembly type efficient construction can be achieved, and carbon emission is remarkably reduced.

Disclosed in the present invention is a structural progressive collapse fragility assessment method combining static and dynamic probabilistic analysis. The method comprises the following steps: (1) acquiring design parameters affecting structural progressive collapse resistance, to obtain a design parameter sample set; (2) constructing corresponding deterministic numerical models for static and dynamic progressive collapse, and on the basis of the sample set, establishing a corresponding sub-model; (3) performing Pushdown analysis; (4) performing non-linear displacement time-history analysis under the action of different load intensities; (5) performing fitting to obtain a probability density function of the structural progressive collapse resistance, and calculating a corresponding mean value and standard deviation; (6) performing fitting to obtain a probability density function of a structural progressive collapse load effect, and calculating a corresponding mean value and standard deviation; (7) obtaining structural progressive collapse fragility scatter points; and (8) fitting, by means of regression analysis, obtained scatter points of exceedance probability corresponding to load coefficients, in order to obtain a structural progressive collapse fragility curve. The present invention can achieve more accurate fragility assessment results.

The invention discloses a system for improving the progressive collapse resistance of bolt-corner fitting modular connection. The system comprises a connecting plate, a connecting piece, a double-splicing type bent plate, shear keys, two upper modules and two lower modules. The first upper module is located above the first lower module, the second upper module is located above the second lower module, the two upper modules and the two lower modules are connected through the connecting plates, the connecting pieces, the double-splicing type bent plates and the shear keys, and the progressive collapse resistance of bolt-corner fitting modular connection can be improved through the system.

This invention discloses a large-span or large-cantilever spatial grid structure and its construction method. The large-span or large-cantilever spatial grid structure includes a spatial grid component, support members, and a reverse-bending prestressed component. The spatial grid component includes an upper chord, a lower chord, and web members; the reverse-bending prestressed component includes upper prestressed cables, main lower inclined cables, lower longitudinal beams, and lower straight beams. It can directionally divert or reduce the internal forces at important components and support node connections, optimize their internal force distribution, reduce the internal forces at support components and support connections, thereby reducing the overturning moment and improving the overall structure's resistance to progressive collapse. It is particularly suitable for large load conditions with spans ≥40m or cantilever ≥20m and can be widely applied to situations where the root stress is large.