1882 results about "Engineering structures" patented technology

An articulated anchor and a prestress tensioning method of high strength fibre composite sheet relate to an anchor holder used to perform prestress tensioning to the high strength fibre composite material of the enhancement or reinforcement engineering structure and a method thereof. The articulated anchor of the invention comprises an anchor head and a compression and locking device, and the articulated anchor is characterized in that the anchor head contains a raised head anchor and a concave block. The method of the invention is that the articulated anchor is used to clamp and anchor the two ends of FRP sheet, a jack is used to apply a tension on the concave block and the concave block pushes the raised head anchor to perform prestress tensioning to FRP sheet. The articulated anchor of the invention has simple structure, convenient installation and low cost; and the method of the invention is simple, intuitive and practical, and can ensure the tensioning uniformity of FRP sheet, made full use of the intensity of FRP sheet and effectively increase the bearing capacity of the engineering structure. The articulated anchor of the invention can be widely used to enhance or reinforce the large engineering structures such as bridges or buildings and especially to perform external prestressing reinforcement to longspan concrete beams, longspan concrete slabs and the like.

The invention discloses bridge structure steel and a production method thereof. The production method comprises: pretreating molten iron; smelting in a top and bottom combined blown converter; refining in a ladle furnace (LF); performing Ruhrstahl Heraeus (RH) refining; continuously casting plate blanks; rolling wide and thick plates; and performing normalizing heat treatment. The produced bridge structural steel comprises the following chemical components in percentage by weight: 0.11 to 0.16 percent of C, 0.10 to 0.45 percent of Si, 1.35 to 1.70 percent of Mn, less than or equal to 0.010 percent of S, less than or equal to 0.020 percent of P, 0.025 to 0.060 percent of Nb, 0.008 to 0.030 percent of Ti, 0.025 to 0.080 percent of V, 0.10 to 0.50 percent of Ni, 0.015 to 0.060 percent of Als, less than or equal to 40*10<-6> of N, less than or equal to 40*10<-6> of O, less than or equal to 2*10<-6> of H and the balance of iron and inevitable impurities, wherein Als represents Alsol. The lower yield strength of the steel plates produced by the method is not less than 370MPa, the tensile strength of the steel plates is not less than 510MPa, the yield to strength ratio of the steel plates is not more than 0.75, the percentage elongation after fracture of the steel plates is not less than 30 percent, the longitudinal AKv of the steel plates at -40 DEG C is not less than 240J, and the steel plates meet the requirements for manufacturing high-speed multi-track railway bridges and can be promoted to be used in engineering structures such as building, transport and ocean platforms.

The invention discloses a method for monitoring the structure health based on a distributed strain dynamic test; the invention adopts a distributed strain transducer to build a distributed sensing network and selects to arrange a reference transducer, carries out structure system simulation state analyzing to obtain a distributed strain simulation state vector DMSV, originally takes whether a target characteristic vector Alpha changes or not as a criterion to identify structural damage, obtains the effects of being capable of rapidly, accurately and effectively capturing the structural damage and locating, and simultaneously adopts the reasonable measures of real time image display and deleting redundant data on time, thereby having the advantages of small errors, high precision, simple process and intuitionistic monitoring; the method can eliminate the interference of noise and environment under the conditions of uncertain loading and an unknown mathematical model, carry out on-line structural damage detecting and diagnosing in real time and is suitable for long period monitoring of various engineering structures, especially for the civil structure.

The invention relates to a horizontal vibration energy-absorbing and vibration-damping device used for large engineering structures such as a longspan foot bridge, belonging to the field of vibration control of civil engineering structures. The horizontal vibration energy-absorbing and vibration-damping device comprises a constant strength cantilever beam consisting of struts at two sides and a cross beam, two ends of the cross beam are respectively and correspondingly connected with the struts at two sides, and the bottom ends of the struts at two sides are fixed on a foundation. The horizontal vibration energy-absorbing and vibration-damping device is characterized in that the upper end of a mass block is connected with the cross beam, the lower end of the mass block is provided with a rectangular permanent magnet; and one side of the lower part of the mass block is provided with a copper plate fixedly arranged on the foundation through a supporting member, and a gap is reserved between the copper plate and the rectangular permanent magnet. The invention ensures that the rigidity and the dampness of the tuned mass damper system realize complete separation, easily realizes that the damping ratio of TMD is continuously adjustable within a larger range though regulating the gap between the permanent magnet and the copper plate, and effectively solves the problems of oil leakage failure in the conventional TMD, difficult regulation of the damping parameters and interference on the frequency.

The invention provides a three-dimensional isolation device, which belongs to the field of the vibration control of a civil engineering structure. The three-dimensional isolation device is characterized by mainly comprising a lead-laminated rubber shock isolator, a combined disc spring, a guiding shaft of the combined disc spring, a diamond steel plate damper and the like, wherein the lead-laminated rubber shock isolator is positioned at the lower part of the device, and a lower joint plate and a middle joint plate of the device are both fixed with a slide guide, a slide block and a crossed high-strength cable respectively; a fixed steel plate at the lower end of the guiding shaft of the disc spring is fixed on the middle joint plate by a bolt, the compound combined disc spring is sleeved on the guide shaft and the top end of the guide shaft is provided with an anti-pull baffle and an anti-pull bolt; and the diamond steel plate damper is positioned horizontally, and the two ends thereof are supported on a steel plate support bracket which is fixed on a fixed steel plate of the guiding shaft of the disc spring, and the middle of the diamond steel plate is fixed on an upper joint plate of the three-dimensional isolation device by a screw and a nut. The three-dimensional isolation device has enough vertical bearing force and provides proper vertical and horizontal rigidity and dampness; and key parts are connected reliably and horizontal limiting and vertical anti-pull measurements are provided.

The invention discloses a mixed steel-concrete composite frame structure, belonging to the technical field of engineering structure. The frame structure comprises a composite column of reinforced special shaped steep pipe concrete, a composite beam of concrete-steel pipe partially filled lightweight aggregate concrete and a reinforced concrete floor; wherein, the composite column of reinforced special shaped steep pipe concrete comprises a steel pipe of a special shaped column, a longitudinal bar of the column, stirrup of the column, concrete outside the steel pipe of the column and core concrete inside the steel pipe of the column; the composite beam of concrete-steel pipe partially filled lightweight aggregate concrete comprises a steel pipe of the beam, an inner separator, a longitudinal bar of the beam, stirrup of the beam and concrete outside the steel pipe of the beam; the space formed by the steel pipes of the beam, which are positioned on the lower part of the steel pipe at the end of the beam and on the upper part of the steel pipe on the midspan of beam, and the inner separator is filled with the core lightweight aggregate concrete in the steel pipe of the beam. The frame structure of the invention has excellent fire and shock resistance and relatively light dead load, can be used in building structures such as residence and is convenient for effective use of building space.

The invention relates to magnesium phosphate cement prepared by using a magnesium oxide byproduct in the process of extracting lithium carbonate from salt lake. The cement is prepared by uniformly mixing the following raw materials in part by weight: 35 to 50 parts of the magnesium oxide byproduct of the salt lake lithium carbonate, 25 to 55 parts of dihydric phosphate, 2 to 10 parts of adjustable solidification agent and 5 to 35 parts of industrial waste residue powder. The magnesium phosphate cement has the advantages that: the condensing time is randomly adjustable from several minutes to several hours; the magnesium phosphate cement has early strength, high strength, and high bonding strength; later strength is retained; and minimum inflation, low-temperature quick condensing and hardening can be realized and the like. The construction process is simple; the magnesium phosphate cement is extremely suitable for emergent repairing for damages, such as stripping, cracking and the like, of engineering structures in various fields, such as building engineering, traffic engineering and the like, is applied to manufacturing of building material products, such as building mortar, concrete bricks and building blocks, heat preservation wall plates, heat insulation roofs and the like, and is used for curing agents for treating wastes, such as nuclear wastes, urban garbage, sludge andthe like.

The invention relates to method for identifying operating modal parameters of a linear time-varying structure based on memory-restricted principal component analysis. According to the method, the operating modal parameters of a dynamical system with time-varying structural characteristics can be identified by only using unsteady vibration response signals, the operating modal parameters of the structure are identified, and the dynamical variation characteristics of the system can be effectively monitored in real time, thus the method can be applied to vibration control, equipment fault diagnosis, health monitoring, and system structure analysis and optimization. The method is characterized in that the parameter characteristics of the system are identified by only using actual measured response signals, load signals aren't measured, and the method is proven according to mathematical theoretical analysis and experiment, so that a physical significance is endowed to the method. The invention further relates to an operating modal measuring device based on the method, and the device is used for measuring vibration response signals and identifying the operating modal parameters to obtain the real-time online dynamical characteristic change of the system structure, thus the device can be applied to fault diagnosis and health monitoring analysis of a large complex engineering structure (bridge, rail and the like).

The invention relates to a 3D (Three-dimensional) printing method of an engineering structure, and belongs to the technical field of engineering. The method comprises the following steps of: manufacturing a framework such as reinforcing steel bars, girders and steel cylinders of the engineering structure firstly according to a three-dimensional model of the engineering structure; and then, spraying concrete on the surface of the framework or inside the framework by a 3D printer layer by layer, wherein the whole printing process is precisely controlled by a computer system, so that the three-dimensional engineering structure is quickly manufactured. The method provided by the invention has the beneficial effects that the method overcomes the defect that conventional engineering structure manufacturing method requires a lot of templates, manpower and working hours, and the manufacturing precision and quality often difficultly satisfy the demand. The method is a major innovation and has important meaning for application of 3D printing in the engineering field.

The invention relates to a hydrojet pretreatment method for accelerating the stabilization of a rust layer on the surface of weathering resistant steel, belonging to the technical field of steel material corrosion prevention. 0.1-3 percent by weight of NaCl, 0.3-3 percent by weight of FeSO4, 0.1-3 percent by weight of CuSO4 and 0.3-3 percent by weight of NaHSO3 are mixed with water uniformly to obtain a surface treating agent of the weathering resistant steel, wherein the surface treating agent is sprayed on the surface of the weathering resistance steel. Chemical materials in a solution react with a steel base to generate a uniform and compact protective rust layer, so that the weathering resistant steel is more attractive in a use process, and rust liquid loss is prevented and the environment can be protected from being polluted. The hydrojet pretreatment method is convenient to operate and short in period, and can be widely applied to weathering resistant steel engineering structures of bridges, buildings and traffics.

The invention discloses a high-strength thin steel plate produced by a CSP (cast steel plate) process and a preparation method of the plate. The high-strength thin steel plate comprises the following components by percent: 0.15-0.25 of C, not larger than 0.10 of Si, 1.00-1.80 of Mn, not larger than 0.020 of P, not larger than 0.010 of S, 0.09-0.20 of Ti, 0.02-0.08 of Als, and not larger than 0.008 of N; and the metallographic structure is a mixture of 20-35% of perlite, 55-75% ferrite and a little of bainite. The preparation method of the high-strength thin steel plate comprises the following steps of smelting and carrying out continuous cast to form blanks; uniformly heating; rolling; carrying out laminar cooling; and reeling. According to the thin steel plate with a hot-rolled structure, disclosed by the invention, the yield strength (ReL) is not less than 700 MPa, the tensile strength (Rm) is not less than 750 MPa, and the wear resistance is good; and according to the preparation method disclosed by the invention, a hot rolling process can replace a cold rolling process, a thin steel plate can replace a thick steel plate, and the prepared high-strength thin steel plate can totally meet requirements of high-strength steel for an engineering structure.

The invention provides a packaging method for a fiber grating sensitivity-increasing/decreasing strain sensor, belonging to the sensing technology field, which comprises a sensitivity-increasing/decreasing theory for the fiber grating strain sensor, a formula for sensitivity-increasing/decreasing coefficients, a sensor structure and a packaging method. The packaging method for a fiber grating strain sensor not only effectively protects the bare fiber grating, but also can change the strain sensitivity of the fiber grating; the sensitivity-increasing/decreasing coefficients can be customized according to the dimensions of the packaging materials in order to meet the requirements of different measurement. The invention has the advantages of that the fiber grating strain sensor based on the packaging method provides the monitoring means of large strain range and high measurement accuracy for the surface and internal strain measurement of large engineering structures.

The invention discloses a monitoring method for time reversal damage to no-datum Lamb wave of an engineering structure. The monitoring method comprises the following steps of: distributing a group of excitation/sensing arrays on a structure to be monitored; building detection channels, and collecting Lamb wave response signals of all excitation/sensing channels; intercepting the response signals, and then conducting time reversal to obtain time reversal structure response signals; loading the time reversal structure response signals onto corresponding excitation, and collecting time reversal focusing structure response signals on the corresponding sensing; and in the time reversal focusing structure response signals of all the detection channels, extracting the occurrence time difference of focusing main wave crest and sidelobe signals, taking the occurrence time difference as a characteristic parameter, calculating to obtain the position and approximate range of the damage by adopting an ellipse positioning method, and analyzing and judging the health condition of the structure to be detected. With the method, the wave packet extension and signal aliasing caused by frequency dispersion can be eliminated, no-datum active positioning and detection to the Lamb wave can be realized, and the healthy monitoring practicalization of the structure can be benefited.

The present invention relates to a digital management method and system used for a water conservancy and hydropower engineering construction process. The method comprises the steps of establishing a construction process integrated data acquisition and analysis platform; establishing a building information model (BIM) management platform by taking a three dimensional platform as the basis; integrating the simulation and analysis services to realize the dynamic evaluation and the analysis prediction; realizing the process management facing a construction technology by taking the integrated data acquisition and analysis platform as the basis; integrating the specialized sub-systems to realize the comprehensive analysis and evaluation; integrating the digital construction equipment to realize the on-site digital monitoring and the intelligent control. According to the present invention, by taking a building information model as the basis, taking a digital construction cooperative working platform as the core, and facing a concrete construction specialty, an integrated, digital and intelligent management platform covering the engineering on-site construction full process is realized, the refinement construction is realized, the engineering progress and the quality management level are improved, the dynamic safety of the engineering structures is guaranteed, and the full life circle management of an engineering is served.

A bridge local damage identification method based on an influence line under a structure health monitoring system relates to the field of engineering structure health monitoring. The method comprises the following steps: (1) fast identification of a bridge influence line; (2) construction of influence line damage indexes; and (3) damage identification based on fusion of multi-sensor information. A bridge influence line is identified based on moving vehicles and bridge response monitored in real time by a bridge health monitoring system, the change of the influence line can be captured in a timelier and quicker way, and structure abnormality can be found early. Based on the fact that the damage indexes of the influence line are more sensitive to local damage of long-span bridges and less sensitive to the change in environmental factors, the method is more applicable to detection of local damage of long-span bridges in an operating environment. By combining the multi-sensor information fusion theory and the influence line damage indexes, the anti-noise-interference and damage locating abilities of the damage identification method are improved greatly, and the credibility of damage decision is improved.

A system and method of manufacture providing reinforced structurally functional load-bearing members, including but not limited to using thermoplastic materials, such as High Density Polyethylene (HDPE), reinforced such as with an aluminum alloy or carbon fiber core element. Among its possible uses, the present invention has application for provision of structural support members, such as an illustrative I-joist product having a vertical center member preferably comprising HDPE, and top and bottom flanges having structurally meaningful reinforcement. The center member and flanges preferably comprising HDPE provides a relatively hard, durable, substantially weather-resistant structure.

The invention relates to a method for achieving multi-material topological optimization of a structure by adopting a sequence power function interpolation method, and belongs to the field of engineering structure optimization design. The method comprises the steps that a parameterized finite element model of a continuum structure is established; a multi-material topological optimization mathematical model is established on the basis of the finite element model; a sequence power function interpolation model of unit elastic moduli and material costs which take the density as the independent variable is established; sensitivity information responded by an objective function, the elastic moduli, a mass function, a cost function and unit material costs is obtained; an optimization rule is educed according to the Kuhn-Tucker condition. Compared with an existing multi-material topological optimization method, according to the sequence power function interpolation method, a topological structure which is high in rigidity, low in cost and light in weight can be obtained only through a small amount of calculation, and the calculation amount has nothing to do with the number of considered material types. In addition, the material cost constraint is also considered, the finally obtained structure is large in rigidity and light in mass, and the material cost is not increased.

The invention relates to a nonlinear rail type collaborative tuning damper which comprises an external cavity unit, a spring system, a viscous liquid, an internal cavity unit, a cushioning material and a particle group. Two groove rails which are arranged in the length direction of the cavity are arranged at the bottom of the damper external cavity unit, the internal cavity unit can slide back and forth along the groove rails and is connected with the inner wall of the external cavity through the spring system, the portion between the external cavity unit and the internal cavity unit is filled with the viscous liquid, the inner wall and bottom of the internal cavity are covered with the cushioning material, and the particle group is composed of circular particles with different sizes. Shaking of the viscous liquid enables the internal cavity to move back and forth to consume energy, and friction and collision of the liquid and the container wall provides the damping effect; the structure self-vibration frequency is tuned by the spring system, and the energy is consumed by means of the collision and friction between the particles or between the particles and the cavity wall. According to the nonlinear rail type collaborative tuning damper, the advantages of various dampers are combined, the vibration damping frequency band is wide, the effect is good, and the nonlinear rail type collaborative tuning damper has wide applicability in the field of civil engineering structure vibration control.

The invention provides a device and method for testing chloride corrosion of a reinforced concrete member under a continuous load. The device comprises a continuous load loading device, a rapid chloride corrosion device and a measurement and control device. A continuous load is applied by a loading frame and a drive device, a frame body is filled with a chloride solution and is fixed at the upper-middle part of a test beam in a sealing manner, air is continuously injected in the chloride solution by adopting an air pump, and direct current is introduced into reinforced steel bars of the test beam to implement the rapid corrosion. Relevant data acquirers, electrochemical testers and output equipment which are controlled through a single chip microcomputer in a unified manner are integrated in the main control box, the continuous load is measured in real time, and periodically corrected to a target level, corrosion behaviors of a corroded member are periodically tested, and data are acquired, displayed, stored, printed and output in real time. The device is capable of effectively simulating an actual corrosion working condition of the on-active service reinforced concrete structure member under the coupling effect of a chloride environment and the load, and provides a scientific basis for evaluating the durability of engineering structures under chloride environments such as sea and salt lakes.

The invention discloses a combined basin-shaped hybrid tuning damper for a wind power generation tower. The combined basin-shaped hybrid tuning damper is characterized in that damping units forming the damper comprise a flat cylinder body and a mass block, wherein the flat cylinder body is provided with cylinder walls and a bottom plate, the top faces of the cylinder walls are connected with upper flanges, the bottom faces of the cylinder walls are connected with lower flanges, and damping liquid is contained in the flat cylinder body; the flat cylinder body is horizontally fixed to the top face of an engineering structure by means of the lower flanges; a universal wheel is arranged at the bottom of the mass block which is placed on the bottom plate of the cylinder body, and the mass block can move in any direction on the bottom plate through the universal wheel; springs are distributed uniformly on the periphery of the mass block, the mass block is connected with the springs in a radiation shape, and the other end of each spring is connected to the corresponding cylinder wall of the cylinder body, and the number of the springs is not less than three.

The invention discloses a super-long distance phase-sensitive optical time domain reflectometer (Phi-OTDR) system, which comprises a Phi-OTDR demodulating system and detecting optical fiber, wherein a forward amplifying unit and a backward amplifying unit are respectively arranged at the front end and the back end of the detecting optical fiber. Detecting signal light of the Phi-OTDR system is amplified in a distributed manner by utilizing a bidirectional second-order or bidirectional multi-order Raman amplifying method, so that the uniformity of the intensity and the distribution of Rayleigh scattering signals on the whole optical fiber is further improved, the problem of the prior amplifying method of the Phi-OTDR system is effectively overcome, and the sensing distance of a single segment of detecting optical fiber of the Phi-OTDR system is further prolonged; and meanwhile, by utilizing bidirectional Raman amplifying multi-segment cascade connection, the super-long distance Phi-OTDR system which requires a low cost and has high performance can be realized. The method of the super-long distance Phi-OTDR system is helpful to improvements on the whole performance and the performance price ratio of the Phi-OTDR system during the application to long-distance safety monitoring of oil and gas transmitting pipelines, large-range peripheries, large-scale civil engineering structures, and the like.

The invention discloses an ocean engineering pile foundation experiment simulation apparatus and method under long-term horizontal cyclic loading. The apparatus comprises: an osmotic force system which provides continuous pressurized water for a saturated sandy soil foundation so that a uniform osmotic flow field forms in the sandy soil foundation to simulate a hyper-gravity environment; a displacement control loading system and a force control loading system that apply horizontal cyclic loadings to an offshore wind turbine superstructure model; a measuring system used for measuring water pressure before the entry into the saturated sandy soil foundation, displacements of the offshore wind turbine superstructure model and a pile model, strain of the pile model, and surface displacement of sandy soil; an uninterrupted power supply system used for powering the osmotic force system, the displacement control loading system, the force control loading system and the measuring system, thereby ensuring all systems can run stably in a long time; the invention also provides an experiment method of the apparatus; the apparatus and the method are widely applicable and suitable for various ocean engineering structures such as oil platforms and offshore wind turbines.

The invention belongs to the technical field of engineering structure control, and in particular relates to a stayed cable vibration damper and a design method for an apparent mass rotating electromagnetic damper. The stayed cable vibration damper comprises a damping device and a transmission mechanism, the transmission mechanism is used for connecting the stayed cable and the damping device, the design method comprises the steps that the fundamental frequency of the stayed cable is determined; the installation location of the apparent mass rotating electromagnetic damper is determined; the damping parameters of the apparent mass rotating electromagnetic damper is calculated; and the stiffness parameters of the apparent mass rotating electromagnetic damper is calculated. According to the stayed cable vibration damper and the design method for the apparent mass rotating electromagnetic damper, a ball screw is utilized to effectively improve the rotational speed of the rotating electromagnetic damper, the equivalent damping coefficient of the damper is improved, and the energy consumption efficiency of the electromagnetic damper is improved; and an inertia flywheel mounted on a rotating shaft of the electromagnetic damper generates an apparent mass effect, the apparent mass effect is amplified through a ball screw mechanism, the stayed cable vibration damping mechanism is provided passive negative stiffness control characteristics, and the vibration damping effect of the stayed cable is effectively improved.