8 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 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 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 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 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.