568 results about "Beam bridge" patented technology

The invention discloses a bridge structure optimization method based on BIM and a finite element method, and relates to the technical field of bridge structure optimization. According to the method, the finite element analysis model can be more accurately established, and the design precision is improved. Through finite element analysis and a digital simulation technology, structure response data is rapidly obtained, and design optimization is accelerated; the optimization of the final scheme is ensured by a multi-iteration optimization strategy, the extreme load response is predicted by introducing a machine learning algorithm, a high-risk area is identified in advance, and the overall performance is improved; based on a multi-scale analysis method, the durability and safety of the structure are comprehensively evaluated, weak links are identified, and long-term performance is guaranteed; meanwhile, the influence of environmental factors on material characteristics is considered, adjustment is performed according to climate data, the design scheme is closer to the actual environment, and durability is enhanced.

The invention relates to the technical field of bridge maintenance, in particular to a beam bridge dynamic anti-seismic performance evaluation method and system, and the method comprises the steps: model preparation, model establishment, boundary condition and load application, analysis and calculation, and result analysis and evaluation. According to the method, through detailed data collection and model preparation, a detailed finite element model of the bridge is accurately constructed, actual characteristics of a main beam, a pier, a support and other key components are fully considered, boundary conditions are reasonably set, seismic loads are applied, calculation is performed by adopting a proper anti-seismic analysis method, and the seismic response of the bridge is effectively calculated; the method has the advantages that the method is simple, the anti-seismic performance of the bridge under the earthquake action is evaluated, potential weak parts of the bridge under the earthquake action are accurately identified, reliable basis is provided for formulating targeted anti-seismic reinforcement measures, and the efficiency and reliability of anti-seismic analysis and performance evaluation of the bridge structure are remarkably improved.

The invention discloses a hollow slab girder bridge maintenance decision-oriented hierarchical knowledge graph construction method, which comprises the following steps of: constructing a hollow slab girder bridge disease classification and maintenance decision general knowledge graph, combing disease types and evaluation indexes of a hollow slab girder bridge through cross-standard feature alignment and rule fusion, and defining each disease and the index thereof in a variable manner so as to construct a hollow slab girder bridge disease classification and maintenance decision-oriented hierarchical knowledge graph. The weight of each disease index is determined based on a fuzzy-Bayesian hybrid reasoning algorithm, and a complete general knowledge graph structure is formed; extracting disease information based on a detection report of a single bridge, endowing each disease with a maintenance suggestion by using a general knowledge graph, and forming a maintenance decision knowledge graph special for the bridge; and dynamically updating the special knowledge graph, and adjusting disease information and maintenance suggestions according to a subsequent detection report of the bridge to ensure timeliness and accuracy of the graph. According to the method, the problems that knowledge is dispersed and systematization is difficult in traditional hollow slab girder bridge maintenance decision making are solved, and scientificity and efficiency of bridge maintenance management are improved.

The invention discloses a railway beam bridge anti-seismic toughness evaluation method and system, relates to the technical field of bridge engineering structures, and solves the technical problem that the prior art lacks an anti-seismic toughness evaluation method suitable for a railway bridge. The method comprises the following steps: establishing a full-bridge nonlinear finite element model to carry out vulnerability analysis; according to a vulnerability result, weighting and quantifying a component damage state and a passage function damage state by adopting a damage probability; determining post-earthquake repair time and a function recovery value, obtaining a post-earthquake bridge passing function recovery curve, finally obtaining a toughness index of the bridge, and dividing the function state of the bridge into three grades; according to the method, a whole process solution of'bridge design parameter-nonlinear time history analysis-probability earthquake demand model-vulnerability analysis-passage function recovery-toughness index-earthquake resistance toughness three levels' of the railway beam bridge is provided, and reference is provided for pre-earthquake design and post-earthquake emergency repair decision.

The invention relates to the technical field of hogging moment region calculation, in particular to a hogging moment region long-term rigidity prediction method for a steel-concrete composite beam bridge. The invention discloses a long-term rigidity prediction method for a hogging moment area of a steel-concrete composite beam bridge. Comprising the steps that a welding stud connecting piece degradation time-varying model and a concrete bridge deck degradation full-time-domain model under the corrosion-fatigue coupling effect are constructed according to test data, and a steel-concrete composite beam bridge hogging moment area rigidity degradation model, steel-concrete composite beam bridge hogging moment area long-term rigidity prediction and the like are constructed. In the process of predicting the rigidity of the hogging moment area of the steel-concrete composite bridge, the deterioration mechanism of a welding stud connector under the corrosion-fatigue coupling effect is considered, the pitting corrosion condition under the environment influence and the welding stud crack condition under the vehicle load influence are considered, the influence of bridge deck slab cracks is considered in the pitting corrosion condition, and the rigidity of the hogging moment area of the steel-concrete composite bridge is predicted. In addition, the mutual relation among the welding stud pitting corrosion influence, the welding stud crack influence and the bridge deck crack influence is considered, and the rigidity of the hogging moment area of the steel-concrete combined bridge is accurately analyzed.

The invention discloses a fabricated beam bridge finished product quality evaluation method fusing fuzzy reasoning and a neural network, and belongs to the field of comprehensive evaluation, and the method comprises the steps: constructing a fabricated beam bridge finished product quality intelligent evaluation system which comprises a first-level index and a second-level index; adopting a fuzzy number to describe quantitative and qualitative indexes, and constructing a fuzzy judgment matrix; calculating an initial weight vector by using an analytic hierarchy process and a defuzzification technology; calculating an improved regularization item balancing data driving and expert priori; and performing weight optimization and weighted summation on the parameters of each component by using a weighted neural network, and outputting a finished product quality score of the fabricated beam bridge. The invention aims to construct an intelligent evaluation system for the quality of the finished product of the fabricated beam bridge, realizes collaborative evaluation of expert knowledge and a data driving method by fusing a deep learning technology, improves the accuracy and robustness of the quality evaluation of the finished product of the fabricated beam bridge, and provides an efficient and reliable technical means for the intelligent evaluation of the quality of the fabricated beam bridge.

The invention discloses a method for calculating the flexural capacity of a prefabricated segmental girder bridge based on steel shear keys, and belongs to the technical field of fabricated prefabricated segmental girder bridges. According to the method, on the basis of the concrete plasticity theory, a theoretical stress model of bending plastic deformation of the prefabricated segmental girder bridge is constructed, a cracking bending moment calculation formula of the three-section type prefabricated segmental girder bridge is established, and design refinement and design efficiency are improved; based on the fact that the anti-bending bearing capacity of the joint of the segmental beam is mainly determined by deformation of a pressed area of a concrete top plate and limit stress of a steel strand, a calculation formula of the anti-bending bearing capacity of the three-section type prefabricated segmental beam bridge at the joint and the non-joint is provided; according to the method, the plastic deformation of the concrete and the bonding slippage effect of the reinforcing steel bars are considered, the bending bearing capacity of the three-section type prefabricated segmental girder bridge can be accurately calculated, and the calculation method is verified to be safe and reliable through comparison with an experimental value.

The present invention proposes an intermediate diaphragm-free, suspended formwork-free, and negative moment tooth block-free beam bridge, and a design method thereof. The beam bridge includes prefabricated main girders, a wet joint, lower structures, and pier cap transverse beams above the lower structures. The concrete deck slabs of adjacent prefabricated main girders are connected by the wet joint. The design method of the above beam bridge includes the following steps: S1, initial design of the main girders; S2, calculation of the non-uniform deflection of the main girders and the indirect transverse stress of the deck slabs; S3, calculation of the direct transverse stress of the deck slabs; S4, crack resistance verification of the deck slab; S5, optimization of bridge parameters to reduce the stress on the driving surface; S6, completion of the beam bridge design. The beam bridge and its design method effectively solve the problem that the existing intermediate diaphragm-free beam bridge is prone to longitudinal cracking at the joints, and realize the suspension tension without the wet joint suspended formwork of the deck slab and the negative bending moment tendon, and have better mechanical properties and better economic, environmental and social benefits, which can facilitate the promotion and application of such bridges in various types of highways , railways and municipal engineering.

The invention relates to the technical field of parameter optimization, and discloses a steel-concrete composite beam bridge prefabricated segment prestress tension parameter optimization method and system, and the method comprises the steps: obtaining a design BIM model, classifying prefabricated segments, constructing an initial digital twinborn model, and obtaining monitoring data; processing the monitoring data to obtain corrected data; comparing the corrected data with a model simulation result, and calibrating the model to generate a precise digital twinborn model; evaluating a multi-dimensional robustness index to construct a feature vector; generating a self-adaptive tensioning strategy sequence through a graph neural network in combination with the feature vector and the precise model; according to the method, intelligent optimization of the tensioning parameters is achieved, and the construction precision and the structural safety of the steel-concrete composite beam bridge are remarkably improved.

The invention relates to the technical field of steel-concrete composite beams, and discloses a steel-concrete composite beam bridge deck reinforcing device which comprises a sealing plate, a first hydraulic cylinder, a first supporting plate, a first polished shaft, a second supporting plate, a first support, a first rotating arm and a second hydraulic cylinder. In the using process, when one side of the top face of the web beam is subjected to overload pressure, the second supporting plate on the same side can be pressed downwards, then the first supporting plate on the same side is made to move downwards, and therefore the moving ends of the first hydraulic cylinders on the same side are made to return. And at the moment, hydraulic oil in the rodless cavities of the first hydraulic cylinders on the same side can enter the rodless cavities of the second hydraulic cylinders on the same side, and then the moving ends of the second hydraulic cylinders on the same side stretch out. And then, under the support of the first support on the same side, the first rotating arms on the same side can deflect towards the direction of the web beam. Due to the fact that hydraulic pressure is adopted as a power source, enough supporting force can be provided for the bottom face and the two side faces of the web beam, and then the anti-overturning performance is improved.

The invention discloses a sensor optimization arrangement method for vibration monitoring of a T-shaped bridge, which comprises the following steps of: firstly, preliminarily drawing up a measuring point group and determining an interested modal order through a finite element model and / or a modal result of the T-shaped bridge obtained by field measurement; then, based on a modal shape matrix of a bridge in a finite element model result, deriving a maximum diagonal element value of a corresponding MAC matrix and a trace of a Fisher information matrix, and increasing and decreasing the degree of freedom of the MAC matrix and the Fisher information matrix through a correction matrix so that the MAC matrix and the Fisher information matrix meet monitoring requirements; comprehensively considering whether the values of the two parameters are in the optimal range or not based on actual measurement and historical data; the measurement point group is the optimal arrangement mode of the vibration sensor if the measurement point group is in the optimal range, and the measurement point group is the optimal arrangement mode of the vibration sensor if the measurement point group is not in the optimal range, the correction matrix acts on the MAC matrix and the Fisher information matrix respectively, the corrected parameter values are compared, and the measurement point group under the optimal parameter value is taken as the optimal arrangement of the vibration sensor.

The invention discloses a temperature prediction method and system for a prestressed reinforced concrete long-span beam bridge, and relates to the field of bridge temperature effect analysis. The method comprises the following steps of: 1, acquiring a construction design position coordinate, and monitoring a structure temperature in the construction design position coordinate; step 2, carrying out ANSYS modeling on the structure temperature to divide grids, and establishing a structure temperature field according to the single structure temperature in each grid; 3, acquiring a time sequence corresponding to the single structure temperature, establishing a mapping relation between the time sequence and the structure temperature field, and establishing a coordinate relation between the time sequence and the structure temperature field; and step 4, predicting the temperature at the next moment according to the coordinate relationship between the time sequence and the structural temperature field by using an LS-SVM regression algorithm based on the time sequence. Through temperature monitoring, the distribution rule of a temperature field is mastered, and the influence of the predicted temperature on the deformation of the main beam in the construction process is theoretically analyzed, so that the stress and deformation in the construction process can be timely and intuitively evaluated.

The invention relates to the technical field of beam bridge splicing, in particular to a large-span concrete continuous beam bridge splicing construction method based on intelligent construction. The method comprises the following steps: acquiring digital modeling data of a left bridge and a right bridge to be spliced; analyzing the digital modeling data, and determining the dynamic stress distribution of the whole construction process; acquiring deformation monitoring data in real time, analyzing the deformation monitoring data, and determining a coordinated deformation rule of the left and right bridges; and generating a splicing construction scheme according to the dynamic stress distribution and the coordinated deformation rule. And the decoupling problem of a digital model and a physical entity is eliminated. The problem of stress control blind areas is solved, stress space-time evolution is quantified, it is ensured that stress prediction covers all stages of construction, and the blind areas of a conventional static model are avoided. The problem of quantitative deficiency of the coordination deformation rule is solved, and the defect of neglecting the deformation coordination is avoided. The problem of construction decision lag is solved, the structural damage probability and temperature cracks are reduced, and coupling of construction execution and a physical mechanism is ensured.

The invention discloses a maintenance and reinforcement method for improving the bearing capacity of a beam bridge, and belongs to the technical field of bridge reinforcement. The maintenance and reinforcement method for improving the bearing capacity of the beam type bridge comprises the steps that a prestressed carbon fiber plate is tensioned on a bottom plate of a beam body so as to improve the flexural capacity of the beam body; a plurality of inclined steel plates are fixed to the web shearing and bending section of the beam body in the longitudinal direction of the beam body so as to improve the shear bearing capacity of the beam body; the prestressed carbon fiber plate is arranged in the longitudinal direction of the beam body, and the tensioned prestressed carbon fiber plate is bonded with a bottom plate of the beam body; a certain included angle is formed between each inclined steel plate and the longitudinal direction of the beam body; first steel pressing strips are distributed on the multiple inclined steel plates, the first steel pressing strips are arranged in the longitudinal direction of the beam body and anchored to a web plate of the beam body, and the first steel pressing strips are used for pressing the multiple inclined steel plates to the web plate of the beam body. According to the reinforcing method for improving the bearing capacity of the beam bridge, the bending resistance and the shearing resistance of the existing beam bridge can be effectively improved, the reinforcing method is simple, and construction is convenient.

The invention discloses an air curtain type cast-in-cantilever beam bridge outer box concrete curing device and method, and relates to the technical field of building construction.The air curtain type cast-in-cantilever beam bridge outer box concrete curing device comprises a curing frame and a temperature and humidity sensor, the curing frame comprises a plurality of rod pieces, sprayers, the multiple sprayers are evenly arranged at the top of the curing frame, and the sprayers are connected through rubber hoses; the temperature and humidity sensor is connected with the curing frame and used for monitoring the temperature and humidity of the concrete surface of the bridge outer box and the surrounding environment of the bridge outer box in real time; according to the air curtain type cast-in-cantilever beam bridge outer box concrete curing device and method, the multiple evenly-distributed nozzles are arranged, the concrete surface is covered with airflow generated by the air curtain device, and it can be guaranteed that the humidity of the concrete surface and the humidity of the surrounding environment are evenly distributed; and the phenomenon that local drying is too fast possibly occurring in a traditional manual water spraying maintenance method is avoided.

The invention discloses a method for calculating the shear capacity of a joint of a prefabricated segmental girder bridge based on a steel shear key, and belongs to the technical field of fabricated prefabricated segmental girder bridges. On the basis of a concrete local pressure bearing theory and a maximum shear stress failure criterion, the concrete local pressure bearing strength is corrected, and a shear bearing capacity calculation formula of a single steel shear key is established; according to the method, a theoretical stress model of the steel shear keys is constructed, a joint shear bearing capacity calculation formula based on the steel shear keys under the construction state of the fabricated prefabricated segmental girder bridge and a joint shear bearing capacity calculation formula under the bridge forming state are provided, and design refinement and design efficiency are improved; assuming that the main compression area of the steel shear key is the front # imgabs0 # / 2 part, so that the shear bearing capacity of the single steel shear key can be calculated more safely; the shear bearing capacity of the fabricated prefabricated segmental girder bridge based on the steel shear keys can be accurately calculated, and through comparison with an experimental value, it is verified that the calculation method is safe and reliable.

The invention discloses a beam bridge anti-seismic weak part detection method and system, and relates to the technical field of bridge anti-seismic monitoring, and the method comprises the steps: S1, simulating the acceleration and displacement response of each section of a bridge under the action of seismic waves through numerical simulation, and obtaining a local dynamic response signal; s2, simulating stress distribution of each section of the bridge under the action of seismic waves by adopting a finite element analysis method according to the local dynamic response signal to obtain stress distribution characteristics of each section; s3, extracting a dynamic response change trend of a stress concentration region in the stress distribution characteristics of each section through time sequence analysis, and obtaining a weak section candidate region; according to the method and the system for detecting the anti-seismic weak part of the beam bridge, an efficient closed loop from local response to overall optimization is realized, and the safety and the stability of the bridge under the action of complex seismic waves are ensured.

The invention provides a curved beam bridge anti-overturning device utilizing a pulley block and an adjusting rod. The curved beam bridge anti-overturning device mainly comprises a steel strand, a fixed pulley, a movable pulley, a supporting rod, the adjusting rod, a steel sleeve, a limiting block, an anchor rod, an anchor ring, an anchoring block, a gasket, an anchor hole, a bolt, a hexagon head and a screw rod. By tensioning the steel strands and combining the pulley blocks, the device can effectively optimize force transmission in the beam body. Meanwhile, the arranged supporting rods can effectively restrain transverse displacement of the curved bridge and resist overturning moment of a single curved bridge. The two ends of the adjusting rod are connected with the supporting rod and the steel strand respectively, and efficient transmission and optimization of force between the supporting rod and the steel strand are achieved through the lever principle. When the curved bridge is subjected to eccentric load or dynamic load, the mutual connection of the structures can obviously optimize the force transmission in the bridge body and effectively restrain the transverse displacement of the bridge, so that the anti-overturning capability of the curved bridge is enhanced. The device provides an innovative solution for improving the safety of the curved bridge under the action of eccentric load or dynamic load.

The invention provides a beam bridge collapse real-time alarm and early warning system and a control method thereof. Comprising a monitoring module which comprises an infrared correlation sensor, a displacement sensor, a tilt angle sensor and a control unit; the transmitting end and the receiving end of the infrared correlation sensor are respectively arranged on the main beam sections on the two sides of the expansion joint; the displacement sensors are used for monitoring the displacement degree of the main beam sections on the two sides of the expansion joint; the tilt angle sensor is arranged on the main beam section and used for monitoring the tilt degree of the main beam section; the control unit is used for receiving the state information, monitored by the infrared correlation sensor, the displacement sensor and the tilt angle sensor, of the main beam section, and generating a control instruction when the state information of the main beam section does not meet the requirement; the warning module is used for generating a warning signal for warning people passing through the girder section when receiving the control instruction of the control unit; and the remote alarm module is used for generating alarm information when receiving the control instruction of the control unit and sending the alarm information to bridge maintenance personnel.

The invention relates to the field of bridge construction, in particular to a turning and jacking integrated construction method and system for a T-shaped structure bridge without a closure segment, and the method comprises the following steps: S1, carrying out T-shaped structure construction in a full framing construction mode; s2, side pier construction is carried out, and jacking bracket devices are pre-buried on side piers; s3, adopting an intelligent swivel system, and monitoring the swivel operation of the T-structure bridge through a measurement monitoring system; s4, temporary buttresses are arranged on the side piers, and synchronous jacking of the main beam is conducted through a micro jack group; s5, after the main beam is jacked to reach the designed elevation, a support is installed, and then the beam is dropped; and S6, the temporary supporting system and construction auxiliary facilities are dismantled, and system conversion is completed. The construction period can be shortened, the construction quality is improved, the construction safety is enhanced, and the construction cost is reduced.

The utility model provides a high-performance electric single-beam bridge crane, which relates to the technical field of single-beam bridge cranes and comprises ten CCD (Charge Coupled Device) cameras, five alarms, two hanging rings, a plurality of connecting rods and a plurality of connecting rods, during use, the distribution box on one side of the end beam can supply power to the CCD camera, the warning projection lamp and the alarm through a power line in the wiring pipe, the warning projection lamp can project a warning range to the ground after being powered on so as to remind workers at the bottom, and the CCD camera can observe the condition of the bottom after being powered on. When the CCD camera detects a worker on the ground, information is transmitted to the control main board through a circuit line in the wiring pipe, the control main board processes the information after receiving the information and transmits the processed information to the alarm through the circuit line in the wiring pipe again, and the alarm gives an alarm. The defect that whether the crane works or not is forgotten to be observed is overcome.

The invention discloses a load distribution method and system for multi-pier coordination of a scouring damaged beam bridge and a storage medium. The method comprises the steps that horizontal and vertical loads acting on a bridge superstructure are obtained; calculating a load distribution result of a vertical load acting on the upper structure of the bridge on the pier according to the counter-force influence line; calculating the horizontal load which acts on the upper structure of the bridge and is distributed to the pier by adopting an iterative method, namely calculating the pier top displacement according to the latest calculated horizontal load of the pier, calculating the equivalent stiffness according to the latest calculated pier top displacement, recalculating the horizontal load distributed to the pier according to the latest calculated equivalent stiffness, and calculating the horizontal load of the upper structure of the bridge according to the calculated equivalent stiffness. The pier top displacement is the pier top displacement of the pier-pile foundation under the conditions of scouring damage, flood load and vehicle load. According to the method, the influence of scouring damage, flood and vehicle load on load distribution is considered, and the accuracy of full-bridge bearing characteristic analysis is improved.

The invention belongs to the technical field of bridge engineering earthquake resistance, and particularly relates to a bridge bidirectional self-resetting earthquake-resistant device and method with a multistage earthquake-resistant function, the bridge bidirectional self-resetting earthquake-resistant device comprises an upper sliding cover plate and a lower fixing base, the upper sliding cover plate is provided with a convex block, the lower fixing base is provided with a groove, and the convex block is in sliding connection with the groove; when the support is normally used and the earthquake force is smaller than the elastic deformation force of the plate-type rubber support, the support is normally used through the shape of the plate-type rubber support, and when the earthquake force is larger than the elastic deformation force of the plate-type rubber support, the upper sliding cover plate and the lower fixing base slide relatively. When the earthquake force is continuously increased, the inclination angle formed by the protruding block of the upper sliding cover plate and the groove of the lower fixing base is used for resisting the earthquake force, and self-resetting of the main beam is achieved through the self-weight effect. A support sliding shock insulation mechanism is fully utilized, serious damage to bridge piers after an earthquake is avoided, meanwhile, residual displacement of the bridge after longitudinal and transverse earthquakes is reduced, beam falling is avoided, and the shock resistance toughness of the bridge under a large earthquake is improved.

The invention relates to a construction welding device for a corrugated steel web composite beam bridge, and belongs to the technical field of corrugated steel web welding devices. The device comprises a bottom frame, supporting beams, a transverse clamping mechanism, a moving driving mechanism and a centering pressing mechanism are arranged on the bottom frame, the number of the supporting beams is multiple, and each supporting beam is installed on the bottom frame in a sliding mode in the left-right direction; the transverse clamping mechanisms are installed on the bottom frame in a left-right sliding mode, each transverse clamping mechanism comprises two supporting blocks, a clamping arm is arranged in each supporting block, and the two supporting blocks can be synchronously close to each other so as to drive the clamping arms to clamp the two straight edges of the corrugated plate; the moving driving mechanism can drive the transverse clamping mechanisms to get close to one another so as to drive the clamping arms to be pressed on the supporting beam. A plurality of sets of centering and pressing mechanisms are arranged, and each supporting beam is provided with one set of centering and pressing mechanism. The corrugated plate clamping device is wider in application range, can clamp and fix a plurality of corrugated plates at the same time, and is higher in machining efficiency.

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 discloses a full-life power design method for a steel-concrete composite beam bridge under the action of an automobile load, and relates to the technical field of bridge life evaluation. The method comprises the following steps: establishing a bridge finite element model according to a design drawing, simulating a random traffic flow, performing nonlinear time-history analysis by taking a contact position of a midspan section web and a lower flange plate as a stress attention part, selecting equivalent stress amplitude and a stress cycle index as random vectors, determining a probability density distribution function, selecting an initial point set, and reforming the point set. And determining a bridge fatigue damage performance function, solving to obtain a time-varying probability density function considering uncertainty, calculating reliability, and obtaining a bridge reliability curve graph under the automobile load according to the reliability under continuous time. By establishing a bridge finite element model, bridge nonlinear dynamic time history analysis under the consideration of vehicle action uncertainty is carried out, the structural reliability of a bridge along with the change of the service life under the action of an automobile load can be quickly and accurately calculated, and the service life prediction of the bridge is realized.

The utility model provides an ultra-wide large-span composite beam bridge which comprises a foundation, two side piers, two middle piers and a steel concrete composite beam, the steel concrete composite beam is composed of a steel main beam, a UHPC bridge deck slab and concrete, and the steel main beam is erected on the side piers and the middle piers; the thickness of the UHPC bridge deck slab is 6-10 cm, the steel main beam comprises a closed steel box and a cantilever arm, a motor vehicle lane and a pedestrian and non-motor vehicle lane are arranged on the UHPC bridge deck slab, and steel beam bottom plates of the two middle piers are combined with concrete. The utility model provides an ultra-wide and large-span combined beam bridge which can be suitable for a highway-rail combined bridge with the span of more than 200m and the ultra-wide bridge width, the bridge width meets the requirements of two-way eight-lane and two-lane light rails, a pedestrian and non-motorized vehicle lane can be arranged, the utilization efficiency of the bridge is improved, and the beam bridge structure is more attractive; and the development of the ultra-wide and large-span composite beam bridge is promoted.

The invention relates to an efficient assembly type steel-concrete composite beam bridge superstructure connecting structure and a construction method, and belongs to the technical field of bridge engineering. Comprising a prefabricated concrete bridge deck, a steel beam, an umbrella-shaped perforated steel pipe connecting piece, a high-strength hook, a wedge-shaped steel accessory, a pi-shaped metal part, an H-shaped high-strength steel accessory, a high-strength bolt and a nut. The wedge-shaped steel accessory is pre-buried in the transverse joint direction of the prefabricated concrete bridge deck slab through a pi-shaped metal part, the bridge deck slab in the transverse joint direction is fastened through an H-shaped high-strength steel accessory, and the H-shaped high-strength steel accessory and the wedge-shaped steel accessory are fastened through a high-strength bolt and a nut; the umbrella-shaped perforated steel pipe connecting pieces are welded to the steel beams, the high-strength hooks are pre-buried in the prefabricated concrete bridge deck in the longitudinal joint direction, the high-strength hooks and the umbrella-shaped perforated steel pipe connecting pieces are hooked tightly after the bridge deck is in place, longitudinal steel bars penetrate through the holes, in the bridge direction, of the umbrella-shaped perforated steel pipe connecting pieces, and finally high-performance grouting materials are poured in the longitudinal joints.

The invention discloses a method and a device for monitoring a closure gap of a cast-in-cantilever beam bridge, and the method comprises the steps: carrying out the multi-day continuous automatic collection of the related environment and deformation data of all closure gaps of a full bridge through installing a monitoring collection device, carrying out the calculation of the collected data through the on-site and remote grading combined calculation, carrying out the overrun monitoring and early warning, and predicting the closure period. Finally, the calculation result and the early warning information are transmitted to related closure workers for application at the application end, a provided data acquisition device is easy and convenient to install and adjust, unmanned automatic monitoring and intelligent combined calculation and real-time automatic over-limit monitoring and early warning are achieved, the closure time period is predicted, comprehensive and high-precision data support is provided for closure construction, and the construction efficiency is improved. And the closure quality is improved.

The invention discloses a beam bridge structure performance state evaluation method based on microwave full-field sensing, and the method comprises the following steps: S100, determining a monitoring point position according to a bridge structure form and a damage mechanism, laying corner reflectors, and completing the installation and positioning of microwave full-field sensing equipment; s200, sequentially transmitting, receiving and processing signals through the microwave full-field sensing equipment in the S100 to obtain response data of the structure; s300, establishing a finite element model for the bridge in the step S100, extracting theoretical response data of corresponding working conditions, and calculating static deflection, a transverse distribution coefficient and modal parameters of a bridge structure according to the actually measured data in the step S200; s400, comparing the structural static deflection, the transverse distribution coefficient and the modal parameter calculated in the step S300 with a threshold value calculated by a finite element, and if the data calculated in the step S300 exceed a theoretical threshold value range, identifying a damage grade and a damage position; the invention also discloses a corresponding evaluation system. Cost is reduced and detection efficiency is improved.