7 results about "Inelastic deformation" patented technology

The invention discloses a continuous beam bridge cast-in-place section corbel bracket hoisting and accurate alignment construction method, which belongs to the technical field of corbel bracket construction, and comprises the following steps: S1, bracket structure design: adopting a triangular bracket as a load-bearing system, selecting double-spliced channel steel as a bracket diagonal rod, selecting double-spliced channel steel as a longitudinal rod, and pre-embedding and connecting with a pier body through a climbing cone; according to the method, a triangular bracket bearing system is adopted, the inclined rods and the longitudinal rods are both made of double-spliced channel steel, climbing cones are accurately pre-buried through a positioning plate with the thickness of 16 mm, reliable connection of the bracket and a pier body is achieved, and the risk that a traditional support is not firm in anchoring is avoided; meanwhile, when the bracket is machined in a factory, the splicing welding seam quality is strictly detected, the attachment degree of connecting nodes is checked through on-site pre-assembly, stage-by-stage pre-pressing is carried out, stability is judged when the final two-time settlement difference is smaller than or equal to 2 mm, the bearing capacity of the bracket can be effectively verified, inelastic deformation is eliminated, and construction safety is guaranteed in the whole process from structural design, machining and installation to load inspection; and hidden dangers of deviation, instability and the like of the frame body are reduced.

The invention provides an intelligent pre-pressing detection system and method based on vision measurement. The intelligent pre-pressing detection system based on vision measurement comprises a pre-pressing loading module, a data acquisition module and an analysis and control module, according to the invention, a reaction frame in the pre-pressing loading module uses a stable foundation beside a to-be-pressed support structure as a fulcrum, a certain load is applied to the to-be-pressed support structure through a pressure applying part in the reaction frame, and the top of the to-be-pressed support structure is loaded while inelastic deformation is eliminated; the data acquisition module can automatically acquire bracket displacement deformation image data in the whole prepressing loading process through a combined target mounted on a bracket structure to be pressed, and transmits the bracket displacement deformation image data into the analysis and control module for deformation data analysis and prepressing control; in the actual loading process, the change rate of the to-be-pressed support structure is judged, when the change rate exceeds the preset safety threshold value, loading can be stopped in time, an alarm is given, and loading safety is guaranteed.

The invention provides a support pre-pressing construction method, and relates to the field of bridge engineering. The method comprises the following steps: laying a bottom die after a bracket is accepted and accepted, and pre-pressing by adopting a sandbag (the weight is greater than or equal to 1.2 times of dead load of a box girder, and the pre-pressing period is greater than or equal to 14 days); loading in four stages until the total weight is 30%, 60%, 100% and 120%, observing every 8 hours after loading in each stage, and carrying out the next stage when the settlement difference is less than or equal to 2mm for three times continuously; after loading is completed, observing to be qualified, and unloading in a grading manner according to a principle of loading first and unloading second; the deformation is calculated according to the pre-pressing data, the elevation and the pre-camber of the formwork are adjusted, and finally the supporting system is reinforced; the safety of the support can be verified, inelastic deformation is eliminated, a basis is provided for pre-camber setting, and the construction quality and safety of the box girder are improved.

A system conversion construction method in the overall lifting process of a steel pipe arch rib comprises the following steps that firstly, all sections of the arch rib to be lifted are assembled at low positions and supported on a low-position support, and a support supporting system is formed; installing a lifting / transverse steel strand and a lifting / tensioning jack for vertically lifting and regulating the arch rib line type; step 2, installing sine strain gauges at trisection positions of upper and lower chord tubes of each section of arch rib; laser ranging devices are arranged at four arch foot corners; 3, transmitting the steel strand cable force data, the jack pump station state, the arch rib stress and displacement data to a control system; and 4, the system is started, a threshold value is set according to the system, automatic reversing tensioning is conducted till the arch rib is lifted away from the low-position support, and a support supporting system is converted into a lifting steel strand lifting system. According to the construction method, the internal stress of the arch rib structure is monitored in real time in the whole system conversion process, the internal stress is kept at a low level all the time, and loading over-limit damage or local inelastic deformation is avoided.

The utility model belongs to bridge engineering technical field discloses a kind of preloading counterforce frame, for the support platform set on pier is carried out counterforce preloading, including fixing piece, preloading distribution beam, tensioning piece and loading unit.Two ends of tensioning piece are connected to fixing piece and preloading distribution beam respectively, start loading unit to provide tensioning piece with tensioning force, tensioning piece after tensioning has the tensioning force towards the direction of fixing piece, tensioning force is passed to support platform by preloading distribution beam, and preloading is formed to support platform, simulate support platform load case, verify the bearing capacity of support platform and eliminate the inelastic deformation of support platform, reduce construction risk.Tensioning piece can be realized adjustable length by modularization splicing, when the support platform preloading on different height pier is carried out, preloading counterforce frame can adjust the length of tensioning piece according to the height difference where support platform is located, so that the tensioning piece of this preloading counterforce frame can be reused, avoid causing resource waste.

This makes it possible to easily simulate the behavior of materials in response to external forces. [Solution] The regression model generation method comprises: a stress-strain acquisition step of acquiring time-series stresses from 0 to N (where N is a natural number) and strains from 0 to N obtained by performing material tests or simulations on the material; an effective inelastic strain rate acquisition step of acquiring the nth effective inelastic strain rate, which is a scalar quantity indicating the magnitude of the deformation rate related to the inelastic deformation of the material, based on the nth stress (where n is a natural number between 1 and N) and the n-1 stress, and the nth strain and the n-1 strain; and a regression model generation step of generating a regression model that has learned the relationship between the nth strain information indicating the nth strain and the nth effective inelastic strain rate.

Described herein is a rebar coupler comprising a collapsible chamber, a solid compressible core located in the collapsible chamber, the solid compressible core resisting a collapsing motion of the collapsible chamber by opposing surfaces of the solid compressible core abutting opposing interior surfaces of the collapsible chamber as the collapsible chamber moves from a relative expanded position to a relative collapsed position. Under axial tension, the core undergoes controlled inelastic deformation — classic yielding for steel or stress-induced phase transformation for shape-memory-alloy (SMA) cores — while the surrounding sleeve remains elastic. When an SMA core is used, the coupler exhibits self-centering with negligible residual deformation, enabling rapid post-earthquake functionality. The modular core concept allows cost-tiered material selection — for example, steel, Cu-Al-Mn SMA, NiTi SMA, and others — while retaining common sleeve geometry and conventional fabrication practices, providing a tunable, replaceable fuse for seismic applications in reinforced-concrete construction, based on a validated force hierarchy that ensures the core yields before the rebar or sleeve.