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46results about How to "Mechanics concept is clear" patented technology
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Geostress field distributed data management (DDM) retrieval method based on actual measurement results and linear programming method
InactiveCN103091727AMechanics concept is clearEasy mathGeological measurementsNumerical modelsData processing
The invention provides a geostress field distributed data management (DDM) retrieval method based on actual measurement results and a linear programming method. According to the geostress field DDM retrieval method based on the actual measurement results and the linear programming method, required parameter information is obtained through experiments according to an engineering site geological exploration report, a displacement discontinuous method DDM numerical model is built according to the obtained information, gravity load is exerted in the vertical direction, unit load is exerted in the horizontal x direction, unit load is exerted in the horizontal z direction, an area stress field is obtained through DDM processing, stress data processing values of ground stress actual measuring points are extracted, processing regression coefficients corresponding to each working condition is processed with the linear programming method according to the stress data processing values of each ground stress actual measuring point, combining the stress field obtained by processing each working condition according to regression coefficients, and then summation is carried out to obtain an inversion ground stress field.
Owner:SHANGHAI JIAO TONG UNIV
Calculation method of safety thickness of supporting layers of pile foundations of karst areas
ActiveCN104809312AEase of design optimizationEasy to operateSpecial data processing applicationsSocial benefitsEconomic benefits
The invention discloses a calculation method of safety thickness of supporting layers of pile foundations of karst areas. The calculation method comprises the following steps: step 1, establishing an assumed model, and simplifying the model; step 2, performing theoretical analysis on the safety thickness of the supporting layers; step 3, performing preliminary checking calculation on the safety thickness of the supporting layers; step 4, performing accurate checking calculation on the safety thickness of the supporting layers; step 5, judging whether the supporting layers satisfy calculation requirements. The calculation method disclosed by the invention is simple in calculation, facilitates design optimization of pile foundations, and is high in operability; in addition, through the adoption of the calculation method, the improvement of relevant norms is promoted, so that huge economic benefits and social benefits can be brought.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
Bridge deflection detection method
InactiveCN105910778AMechanics concept is clearSimple methodElasticity measurementLeast squaresDeflection angle
The invention provides a bridge deflection detection method comprising the following steps that a. multiple inclination angle values corresponding to multiple specified points on a bridge are acquired; b. fitting of an inclination angle function f(x) is performed based on the multiple inclination angle values; and c. a deflection value I of a point to be detected is acquired according to the formula (which is expressed in the specification), wherein the interval [a, b] is an interval formed by the initial point of the inclination angle function and the point to be detected. The cross section inclination angle values measured by an inclinometer are processed by adopting an immediate integration method so that the mechanical concept is clear, the method is easy and convenient, the accuracy is better than that of a least square method, and other bridge information is not required apart from the cross section rotating angle and the cross section position.
Owner:SHANGHAI TONGJI CONSTR QUALITY INSPECTION STATION
Reinforcement design method of reinforced concrete members subjected to complex loads based on force transfer path
ActiveCN109344437ASufficient theoretical supportReduce dosageGeometric CADDesign optimisation/simulationReinforced concreteRebar
The invention belongs to the technical field of structural design of civil engineering, The reinforcement design method of reinforced concrete complex mechanical members based on force transfer path is mainly used for reinforcement design of reinforced concrete complex mechanical members which do not conform to plane section assumption, such as deep beams, shear walls and the like, including (1) obtaining the force transfer path of reinforced concrete complex mechanical members; (2) carrying out Reinforcement design according to the path of force transfer; (3) performing consolidation and finishing of reinforcing bars; (4) performing Structural design of components. The present invention is based on the idea that the reinforcement design of the reinforced concrete complex stressed member is carried out with the force transmission path as the starting point, It can change the situation that the rough design of traditional empirical design method leads to low precision and only based ontest statistics leads to insufficient theoretical support, and provides a new technical thinking for the reinforcement design of complex structural members or new materials which are difficult to be solved more accurately nowadays.
Owner:HUNAN UNIV OF SCI & TECH
Damaged prestressed concrete flexural member decompression moment test method
InactiveCN104880369AIncreased sensitivityAccurate detectionMaterial strength using steady bending forcesPrestressed concrete beamPre stress
The invention belongs to the technical field of bridge structural engineering, and in particular relates to a damaged prestressed concrete flexural member decompression moment test method. A damaged prestressed concrete flexural member decompression moment test system adopted by the method comprises a bridge, a vertical load applying device, a surface strain gauge and a data acquisition instrument, wherein the vertical load applying device is arranged on a to-be-detected cracking section of the bridge; the surface strain gauge is installed on the surface of outer edge reinforcement without reinforcement cover concrete at a tensile area of the to-be-detected cracking section of the bridge; the data acquiring instrument is connected with the surface strain gauge through a conductor. Compared with the prior art, the damaged prestressed concrete flexural member decompression moment test method is simple to operate, accurate and reliable in result, easily mastered by engineering technicians, and is suitable for detecting and evaluating the cracked prestressed concrete flexural member decompression moment.
Owner:SHANXI PROVINCIAL RES INST OF COMM
Device and method for in-situ testing of earth pressure
PendingCN108120645AReduce disturbanceThe test effect is goodMaterial strength using tensile/compressive forcesEngineeringConduction mode
The invention discloses a device and method for in-situ testing of an earth pressure. The device for in-situ testing of the earth pressure comprises a back panel, wherein the front face of the back panel is provided with a groove, an elastic contact panel is packaged and arranged on an open surface of the groove, and the elastic contact panel and the groove are enclosed to form a closed hydrauliccavity; and the hydraulic cavity is communicated with a hydraulic pressure meter, and the hydraulic cavity is filled with liquid. The device and the method provided by the invention have the advantages that the earth pressure is measured by adopting a hydraulic conduction mode, the influence of surrounding soil layers in a mounting process is small, and the problem that a measurement result is distorted in the prior art is effectively solved.
Owner:SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
Analysis method for torsion resistance moment of inertia of beam element of architectural structure
InactiveCN102521462AMechanics concept is clearImprove applicabilitySpecial data processing applicationsDatum referenceFinite element method
The invention discloses an analysis method for torsion resistance moment of inertia of a beam element of an architectural structure. The analysis method includes scattering sections into solid units, shell units or rod units according to types of building materials; and computing deformation parameters of finite element modules which are formed by means of scattering the sections and consist of the solid units or the shell units in a finite element manner, determining torsion resistance moment of inertia by the aid of the deformation parameters, and using the torsion resistance moment of inertia as the torsion resistance moment of inertia of the beam element with the scattered sections. The analysis method includes steps of determining a section corner theta' under the effect of torsion by the aid of the solid (shell) units which are formed after the sections are further scattered, accordingly determining the torsion resistance of moment of inertia and using the torsion resistance of moment of inertia as the torsion resistance moment of inertia of the beam element. Compared with the prior art, the analysis method adopts the scheme that the torsion resistance moment of inertia is computed by means of integration of a formula or a section, mechanical concepts of the analysis method are clear, practicality is high, effects of transverse partition boards and the like in a beam canbe taken into consideration, computation results are accurate, and more accurate data references can be provided for consequent mechanical analysis.
Owner:RES INST OF HIGHWAY MINIST OF TRANSPORT
Box girder bridge section design optimization method
InactiveCN105243236AOptimize section sizeAvoid crackingSpecial data processing applicationsDiseaseStructural dynamics
The invention discloses a box girder bridge section design optimization method. According to the method, the effects of factors such as box girder shear lag and shear deformation effect are considered; firstly, deformation potential energy and kinetic energy of a box girder are determined, so that a structural dynamic control differential equation and a natural boundary condition are obtained by the hamilton principle. Secondly, a related application program is compiled based on this; and a fine analysis on dynamic characteristics of the box girder bridge is expanded by Matlab software. Finally, with an inherent frequency value of the box girder bridge as a criterion, namely the inherent frequency value is large, the structure deformation potential energy is small, the section size of the box girder bridge is optimal, and the effectiveness of the box girder bridge section design optimization method is further proved by a statics analysis, so that the structure is in a good mechanical state due to the optimized box girder section; avoiding of bad diseases such as girder box cracking, stiffness reduction and local buckling is facilitated; and the box girder bridge section design optimization method is clear in mechanical concept and simple in calculation, has good application value, and is a beneficial supplement to an existing box girder bridge design theory.
Owner:YANCHENG INST OF TECH
Structure for preventing bridge from overturning transversely and construction method of structure
ActiveCN105970799AAvoid vertical displacementMechanics concept is clearBridge structural detailsBridge erection/assemblyRebarSteel plates
The invention relates to a structure for preventing a bridge from overturning transversely and a construction method of the structure and belongs to the technical field of bridge structures. The structure comprises bridge deck slab bottom embedded steel plates, channel steel plates, corbels, steel anchor rods and nuts. The corresponding steel plates are embedded in the bottom of a bridge deck slab along the two transverse sides and firmly connected with the bridge deck slab through anchoring parts. The channel steel plates and the embedded steel plates are connected in a welded manner. The steel corbels or the reinforced concrete corbels are arranged at the positions, close to the top, of a pier. Oval holes are reserved in the bottoms of the channel steel plates and the corbels. The diameter of each steel anchor rod is smaller than the width of each oval hole. The steel anchor rods vertically penetrate the reserved holes. The two ends of each steel anchor rod are screwed through the nuts. Tiny gaps are reserved between the nuts at the lower ends and the bottom faces of the corbels, so that a bridge deck system is allowed to slide freely in the longitudinal direction of the bridge, and meanwhile the bridge deck system and the pier can be connected in a pulling manner. The structure for preventing the bridge from overturning transversely is reasonable in stress, capable of obtaining materials easily, simple, convenient to construct, economical and practical.
Owner:TSINGHUA UNIV
Method and device for testing initial setting time of pavement concrete
InactiveCN103278388AMechanics concept is clearImprove test stabilityMaterial strength using tensile/compressive forcesMaterial DesignResearch Object
The invention relates to a method and device for testing initial setting time of pavement concrete. The method for testing the initial setting time of the pavement concrete comprises the following steps: firstly, placing a concrete simply supported beam test piece with certain ages on a hollow plate, and arranging a temporary support for supporting the middle of a concrete simply supported beam test piece in the rectangular orifice of the hollow plate; and then removing the temporary support in the rectangular orifice; at the time, the concrete simply supported beam test piece is hung in the air; and if the concrete simply supported beam test piece is damaged, that the concrete simply supported beam test piece fails to reach initial setting is shown, and if the concrete simply supported beam test piece is not damaged, that the concrete simply supported beam test piece reaches initial setting is shown. According to the invention, a concrete entirety is taken as a researching object, mechanic concept is clear, and through researching mechanic damage under gravity, flexural-tensile stress state is reflected directly; and the method and the device have certain advantages in aspects of influences to pavement bending performance from reflecting concrete entirety early age action, improving testing stability and evaluating material design.
Owner:FUZHOU UNIV
H-shaped steel concrete column with high-strength spiral hoop and restraining high-strength wide flange
The invention provides an H-shaped steel concrete column with a high-strength spiral hoop and a restraining high-strength wide flange and relates to a sectional steel concrete column. The defects of the present I-shaped and H-shaped steel concrete columns that the construction is difficult, the anti-bending function of the sectional steel is not completely utilized because a concrete protecting layer is thick, and the high-strength sectional steel is easy to press and deflect are overcome. A longitudinal reinforcement is abolished, a steel area is converted into the sectional steel flange and the construction and the design of the sectional steel concrete column are convenient to perform. The spiral hoop is a high-strength rectangular spiral hoop; the inner side of the spiral hoop of the restraining sectional steel flange is clung to the surface of the sectional steel flange; and an unstable critical stress of the sectional steel flange is increased by a free edge of the restraining sectional steel flange; the spiral hoop is tightly combined with the flange, so that a function of a bolt is achieved and the concrete can more effectively coordinate with the sectional steel; the concrete protecting layer of the sectional steel is 30-40mm thick, thereby being fireproof requirement and fully utilizing the anti-bending function of the sectional steel; a screw pitch of the rectangular spiral hoop is 0-60mm, so that the restraining condition of the free edge of the restraining sectional steel flange is obviously improved; and the H-shaped steel concrete column provided by the invention is applied to a sectional steel concrete structure.
Owner:NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
Method for quickly extracting mid-span displacement influence line of vehicle slowly passing through simply supported beam bridge
ActiveCN111581723AMechanics concept is clearEasy to operateGeometric CADSpecial data processing applicationsStatic forceData processing
The invention discloses a method for quickly extracting mid-span displacement influence lines of vehicles slowly passing through a simply supported beam bridge, and belongs to the technical field of bridge detection methods. The objective of the invention is to solve the problems of unclear mechanical concept and difficulty in obtaining an influence line measured value in an existing quasi-staticload test. According to the method, effective separation is carried out on a midspan displacement curve actually measured on site, the midspan displacement curve is compared with a theoretical influence line, quick evaluation work of the technical state of the bridge can be achieved, and the technical problem that in the quasi-static load test process, a theoretical value is not easy to obtain during data processing, and consequently the theoretical value cannot be compared with an actually-measured value can be effectively solved. The bridge state quick evaluation method based on the displacement influence line is clear, and the mechanical concept is clear; by means of the method, the displacement curves under the action of the multiple axles can be quickly converted into the structure influence lines, the structure influence lines can be directly compared with theoretical values, the operability of the method is improved, and then quick and accurate evaluation of the bridge state isachieved.
Owner:HARBIN INST OF TECH
Optimized design method for section of multi-rib type T-shaped beam bridge
InactiveCN105046027AImprove mechanical stateImprove securitySpecial data processing applicationsShearing deformationDifferential equation
The invention discloses an optimized design method for the section of a multi-rib type T-shaped beam bridge. The optimized design method includes the steps that a governing differential equation and the natural boundary condition of the multi-rib type T-shaped beam bridge are built on the basis of the principle of minimum potential energy, influences of factors such as the shear-lag effect, the shear-lag warping stress self-equilibrium condition and Timoshenko shear deformation of the multi-rib type beam bridge are comprehensively considered to carry out fine mechanical analysis on the structure, and then the reasonable size of the section is selected to enable the multi-rib type beam bridge to be in the good mechanical state. According to the optimized design method, the mechanical analysis is more accurate, bad diseases such as beam cracks and rigidity reduction can be easily avoided accordingly, and the safety performance of the multi-rib type beam bridge is improved. The optimized design method is clear in mechanical concept and simple in calculation, the multi-rib type beam bridge is in the good operation state, and therefore the good application value is achieved.
Owner:YANCHENG INST OF TECH
Simply supported steel box girder prestressing cable shape optimizing method
InactiveCN105040569AImprove mechanical stateMechanical analysis is accurateBridge materialsMaterial consumptionThin walled
The invention discloses a simply supported steel box girder prestressing cable shape optimizing method. By introducing a thin-walled box girder theory, the method is more accurate in mechanical analysis; compared with a traditional prestressing cable shape, the dual effects of obtaining pre-camber and exerting prestress can be well achieved. Due to the arrangement of optimized prestressing cables, a box girder is in a better mechanical state, and therefore bad damage such as girder box cracks and local instability can be easily avoided, and the durability of the structure is improved. Meanwhile, the method is clear in mechanical concept, simple in calculation and wide in application prospect and practical value. By means of the method, the mechanical performance of the box girder can be optimized, and the steel material consumption can be further saved.
Owner:YANCHENG INST OF TECH
Method for calculating combined action of load structures under internal water pressure of composite lining of shield tunnel
ActiveCN107798166AMechanics concept is clearEasy to calculateUnderground chambersDesign optimisation/simulationInternal pressureMechanical Concepts
The invention discloses a method for calculating a combined action of load structures under an internal water pressure of a composite lining of a shield tunnel. The method comprises the following steps of (1) building a calculation model for a lining, a shield segment and a surrounding rock which are arranged in sequence from inside to outside and bear the internal water pressure together, decomposing the lining, the shield segment and the surrounding rock into structure bodies bearing the internal water pressure separately, and calculating inner diameter changes of the structure bodies underthe action of different internal water pressures and relationships between the different internal water pressures and the stresses of the structure bodies; and (2) according to radial deformation coordination and deformation required to be controlled for seepage prevention, and in combination with a result in the step (1), determining loads sharable for the lining, the shield segment and the surrounding rock, and finally determining an actual structure of the shield tunnel under the condition of ensuring a bearable designed internal water pressure value, wherein a total internal water pressurebearable for the shield tunnel is a sum of internal water pressures bearable for the structure bodies under displacement coordination. According to the method, a mechanical concept is definite; the calculation is simple and convenient; and an effective, simple and convenient load structure method-based practical calculation method can be provided for engineering design of a complex stress structure.
Owner:GUANGDONG RES INST OF WATER RESOURCES & HYDROPOWER
Method for quickly extracting midspan displacement influence lines of double-axle vehicle slowly passing through continuous beam bridge
ActiveCN111666623AEasy to operateMechanics concept is clearGeometric CADDesign optimisation/simulationInfluence lineSimulation
The invention discloses a method for quickly extracting midspan displacement influence lines of a double-axle vehicle slowly passing through a continuous beam bridge, and belongs to the technical field of bridge detection methods. The method for quickly and accurately evaluating the state of the continuous beam bridge based on the displacement influence line is defined, the displacement curve under the action of the double-axle vehicle is quickly converted into the structure influence line, the structure influence line can be directly compared with a theoretical value, the operability is improved, and the mechanical concept is clear. According to the method, the midspan displacement curve actually measured on site is effectively separated and compared with the theoretical influence line, and then rapid evaluation work of the technical state of the bridge can be achieved. By means of the method, the technical problem that in the quasi-static load test process, theoretical values are noteasy to obtain during data processing, and consequently the theoretical values cannot be compared with measured values can be effectively solved.
Owner:HARBIN INST OF TECH
Optimization method based on dynamic characteristic I-shaped beam section design
InactiveCN106168986AOptimal section sizeThe natural frequency value is largeGeometric CADSpecial data processing applicationsEnergy variationShaped beam
The invention discloses an optimization method based on dynamic characteristic I-shaped beam section design. The method comprises the steps that deformation potential energy and kinetic energy of an I-shaped beam bridge are obtained at first, then, an energy variation method is utilized for obtaining a governing differential equation and natural boundary conditions of I-shaped beam vibration, a relevant application program is compiled based on this, and fine analysis is carried out on natural vibration characteristics of the structure through Matlab software; finally, the inherent frequency value of the I-shaped beam bridge is used as the criterion, in other words, the inherent frequency value is large, structure deformation potential energy is small, and the I-shaped beam section size is optimal, and the effectiveness of the method is further proved through the structure statics analysis. Due to the fact that mechanical analysis is accurate, the I-shaped beam bridge with the optimized section size is in a good mechanical state, and defects such as beam cracking, stiffness degradation and midspan excessive downwarping can be avoided. The optimization method is clear in mechanical conception and simple in calculation, has a good application value, and is the beneficial supplement for an existing I-shaped beam bridge design theory.
Owner:YANCHENG INST OF TECH
Optimization method for design of anti-torsion cross-sections of beams shaped like'T'
ActiveCN106649921AExcellent torsional section sizeSmall sizeGeometric CADSustainable transportationEnergy variationDisease
The invention discloses an optimization method for design of anti-torsion cross-sections of beams shaped like 'T'. Potential energy and kinetic energy of torsional deformation of the beams shaped like'T'are firstly obtained in the optimization method. Control differential equations and natural boundary conditions of torsional vibration of the structures shaped like'T'are obtained by utilizing an energy variation method.A calculation formula ofnatural frequency of the simply-support beamsshaped like'T'is obtained on the basis of the processes above. Eventually frequency values of the torsional vibration of the beams shaped like'T' are regarded as judgment basis. The higher the natural frequency value is, the lower the potential energy of the torsional deformation of the structures will be and the more excellent the sizes of the anti-torsion cross-sections of the beams shaped like 'T' will be. And the effectiveness of theoptimization methodfor design of anti-torsion cross-sections of beams shaped like 'T' is further proved by statics analysis of the structures. Because mechanicalanalysis is accurate in the optimization method, anti-torsion performance of the optimized structures shaped like'T'becomes better. And beam cracking which happens due to torsion, stiffness degradation, buckling and other adverse diseases can be avoided. The optimization method for design of anti-torsion cross-sections of beams shaped like 'T' is clear in mechanics concept, simple in calculation and good in application value, which can provide theoretical and technical support for the anti-torsion design of civil engineering structure or mechanical engineering.
Owner:YANCHENG INST OF TECH
Intelligent steel strand tension value correction and calculation method with grating embedded in core wire
ActiveCN113108985AMechanics concept is clearEasy to operateForce/torque/work measurement apparatus calibration/testingGratingPre stress
The invention discloses an intelligent steel strand tension value correction and calculation method with a grating embedded in a core wire, which comprises the following steps of: carving a groove in the core wire of a steel strand, embedding the grating, connecting one end of an optical fiber to the grating, and leading an interface at the other end of the optical fiber to the end part of the steel strand; calculating a strain iteration initial value and a strain iteration final value of the winding wire of the same section according to the parameters of the steel strand before being stressed, the corresponding parameters after being stressed, the strain monitoring result of the core wire of the steel strand in the structural stress process and the actual strain of the winding wire; and calculating the actual tension of the steel strand at the measuring point. The steel strand tension value correction calculation method provided by the invention is clear in mechanics concept, simple to operate, accurate and reliable in result, easy to master by engineering technicians, and applicable to evaluation of monitoring results of cable forces of prestressed concrete bridge steel strands and steel strand inhaul cables.
Owner:山西省交通科技研发有限公司
Bending test method for F-shaped socket and spigot joint of rectangular pipe-jacking tunnel
ActiveCN109781366AAccurately Obtain the Rotational Stiffness ModelMechanics concept is clearMaterial strength using steady bending forcesElasticity measurementEngineeringPressure sensor
The invention discloses a bending test method for an F-shaped socket and spigot joint of a rectangular pipe-jacking tunnel. The bending test method comprises the following steps: two rectangular pipe-jacking components connected by the F-shaped socket and spigot joint are placed on a supporting system, and the supporting system comprises a fixed support, elastic supports, a temporary support and asliding support; a vertical load applying device is arranged right above a steel lantern ring, the upper parts of the two elastic supports are respectively provided with a pressure sensor, and the lower part of the steel lantern ring is provided with two electric measuring displacement meters; all levels of loads are sequentially applied through the vertical load applying device to obtain test data, and the test data are analyzed and processed to obtain the rotating rigidity model of the rectangular jacking pipe F-shaped socket and spigot joint. The method has the advantages that the operability is high, the elastic support is arranged to simulate the limiting effect of the stratum on the rotation of the joint, the bending mechanical behavior of the rectangular jacking pipe joint can be truly reflected, and a rotation rigidity model of the joint is accurately obtained.
Owner:INNER MONGOLIA UNIV OF SCI & TECH
Method and system for calculating overall elasticity modulus of cracked reinforced concrete
ActiveCN110377968AMechanics concept is clearEasy to calculateGeometric CADSustainable transportationReinforced concreteEngineering
The invention discloses a method and a system for calculating the overall elastic modulus of cracked reinforced concrete. The method comprises the following steps of analyzing and simplifying the common stress characteristic of the reinforced concrete at a crack position; then determining the lengths of the steel bars with higher stress on the two sides of the crack; combining and considering thesimplification result of the crack position and the calculation result of the length of the tensioned steel bar; finally, obtaining the overall elasticity modulus of the cracked reinforced concrete. The method is clear in mechanical concept and simple and convenient to calculate, an effective, simple and convenient practical calculation method can be provided for modulus change of the cracked reinforced concrete, reference can be provided for composite linings and other projects needing to apply modulus change application after concrete cracking, and the method can be widely applied to the technical field of capital construction projects.
Owner:GUANGDONG RES INST OF WATER RESOURCES & HYDROPOWER
Self-reset frame-energy dissipating connecting filling wall structure
InactiveCN111411698AHigh strengthIncrease stiffnessWallsHeat proofingVibration controlArchitectural engineering
The invention discloses a self-reset frame-energy dissipating connecting filling wall structure. The self-reset frame-energy dissipating connecting filling wall structure comprises a foundation, standcolumns, a cross beam, a filling wall, a powerful confinement frame, inclined struts, fillers, energy dissipating parts and a prestressed cable, the problem of damage deforming of a frame body and the filling wall during the earthquake can be solved, the structure can rapidly recover the use function after the earthquake, the filling wall and a main frame are separated, through the energy dissipating parts, connection is achieved, the fillers are used for filling gaps, the prestressed cable is mounted in the main frame, self-resetting capacity is provided, the strength and rigidity of the frame can be improved, due to the arranging of the energy dissipating parts, the displacement angle between structure layers can be effectively reduced during the earthquake, the filling wall is reinforced by the powerful confinement frame and the inclined struts, it is ensured that the filling wall has the enough strength and cannot be damaged under the earthquake effect, the energy dissipating parts in the fillers can effectively consume energy input to the structure by the earthquake, and the energy dissipating parts and the prestressed cable jointly achieve energy consumption, vibration control and self resetting after the earthquake of the frame filling wall structure.
Owner:HAINAN UNIVERSITY
Calculation method of joint action of load and structure under water pressure in composite lining of shield tunnel
ActiveCN107798166BMechanics concept is clearEasy to calculateUnderground chambersDesign optimisation/simulationInto-structureStructural engineering
The invention discloses a method for calculating a combined action of load structures under an internal water pressure of a composite lining of a shield tunnel. The method comprises the following steps of (1) building a calculation model for a lining, a shield segment and a surrounding rock which are arranged in sequence from inside to outside and bear the internal water pressure together, decomposing the lining, the shield segment and the surrounding rock into structure bodies bearing the internal water pressure separately, and calculating inner diameter changes of the structure bodies underthe action of different internal water pressures and relationships between the different internal water pressures and the stresses of the structure bodies; and (2) according to radial deformation coordination and deformation required to be controlled for seepage prevention, and in combination with a result in the step (1), determining loads sharable for the lining, the shield segment and the surrounding rock, and finally determining an actual structure of the shield tunnel under the condition of ensuring a bearable designed internal water pressure value, wherein a total internal water pressurebearable for the shield tunnel is a sum of internal water pressures bearable for the structure bodies under displacement coordination. According to the method, a mechanical concept is definite; the calculation is simple and convenient; and an effective, simple and convenient load structure method-based practical calculation method can be provided for engineering design of a complex stress structure.
Owner:GUANGDONG RES INST OF WATER RESOURCES & HYDROPOWER
Calculation Method of Safe Thickness of Bearing Layer of Pile Foundation in Karst Area
ActiveCN104809312BEase of design optimizationEasy to operateSpecial data processing applicationsSocial benefitsKarst
The invention discloses a calculation method of safety thickness of supporting layers of pile foundations of karst areas. The calculation method comprises the following steps: step 1, establishing an assumed model, and simplifying the model; step 2, performing theoretical analysis on the safety thickness of the supporting layers; step 3, performing preliminary checking calculation on the safety thickness of the supporting layers; step 4, performing accurate checking calculation on the safety thickness of the supporting layers; step 5, judging whether the supporting layers satisfy calculation requirements. The calculation method disclosed by the invention is simple in calculation, facilitates design optimization of pile foundations, and is high in operability; in addition, through the adoption of the calculation method, the improvement of relevant norms is promoted, so that huge economic benefits and social benefits can be brought.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
Rapid extraction method of double-axle vehicle slowly passing through mid-span displacement influence line of continuous girder bridge
ActiveCN111666623BEasy to operateMechanics concept is clearGeometric CADDesign optimisation/simulationInfluence lineContinuous beam
Owner:HARBIN INST OF TECH
Design method for steel and concrete combined continuous beam hogging moment area
The invention discloses a design method for a steel and concrete combined continuous beam hogging moment area. Firstly, according to the section size of a combined beam and the fitted hogging moment area bottom plate concrete thickness, the common section inertia moment I and the fulcrum hogging moment area section inertia moment I' of the combined beam are calculated; a continuous beam calculation model in which full-bridge section inertia moments are I is established, and the midspan maximum sagging moment Mmax and the fulcrum maximum hogging moment Mmin under the action of the constant load are calculated; the equation F(lambda)=0 is solved, and lambda is obtained through calculation; and according to L'=lambdaL, the hogging moment area bottom plate concrete section length L' of the combined beam is obtained through calculation, and hogging moment area design is finished. According to the design method, the steel and concrete combined continuous beam hogging moment area length obtained through derivation of the structural mechanics method serves as the hogging moment area bottom plate concrete section length, the hogging moment area design of the steel and concrete combined continuous beam can be rapidly finished, and the design method overcomes the defects that during engineering design, subjective randomness is large, and pilot calculation is repeated; and a series of advantages that the mechanics concept is clear, and universality is high are achieved.
Owner:HENAN PROVINCIAL COMM PLANNING & DESIGN INST CO LTD +2
A Bending Test Method for F-Type Socket Joint of Rectangular Pipe Jacking Tunnel
ActiveCN109781366BAccurately Obtain the Rotational Stiffness ModelMechanics concept is clearMaterial strength using steady bending forcesElasticity measurementSupporting systemArchitectural engineering
Owner:INNER MONGOLIA UNIV OF SCI & TECH
Method and device for optimizing finite element iteration process based on deep learning
ActiveCN114021414AImprove computing efficiencyFast convergenceDesign optimisation/simulationNeural architecturesElement modelData set
The invention provides a method and a device for optimizing a finite element iteration process based on deep learning, and relates to the technical field of civil structure engineering and computers. The method comprises the following steps: establishing a single unit finite element model based on a constitutive relationship; performing iterative calculation solution on the single unit finite element model, and summarizing iteration process data to form a data set; carrying out deep learning on a difficult-to-converge data set of a single unit finite element model; and establishing a real structure finite element model according to the constitutive relationship and the deep learning model, defining a load working condition and a loading and unloading path according to the actual stress condition of the structure, obtaining a finite element simulation result of the real structure, and completing an optimization finite element iteration process based on deep learning. According to the method, prediction of the next state point in iteration is achieved through the deep learning algorithm, the number of iteration steps is reduced, the calculation efficiency and convergence of the finite element model are optimized on the basis that the accuracy of the simulation result is guaranteed, and high universality is achieved.
Owner:UNIV OF SCI & TECH BEIJING
Method and device for testing initial setting time of pavement concrete
InactiveCN103278388BMechanics concept is clearImprove test stabilityMaterial strength using tensile/compressive forcesMaterial DesignResearch Object
Owner:FUZHOU UNIV
H-shaped steel concrete column with high-strength spiral hoop and restraining high-strength wide flange
InactiveCN102747810BEasy constructionMechanics concept is clearStrutsPillarsMaterials scienceCritical stress
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