5 results about "Section modulus" patented technology

The invention discloses a steel structure beam unit section intelligent optimization method and device and a medium. Obtaining a target beam unit of which the cross-sectional area is to be calculated, and obtaining a current axial force, a current allowable stress and a plurality of working conditions corresponding to the target beam unit; obtaining an initial beam unit cross-sectional inertia moment, and respectively calculating an initial beam unit cross-sectional area, an initial X-direction cross-sectional modulus and an initial Y-direction cross-sectional modulus through a preset initial beam unit cross-sectional inertia moment function; for each working condition, calculating a beam unit cross-sectional area corresponding to each working condition through a beam unit cross-sectional area intelligent optimization calculation method; and in each beam unit cross-sectional area, selecting the maximum beam unit cross-sectional area as a target beam unit cross-sectional area corresponding to the target beam unit, and feeding back the target beam unit cross-sectional area to a user. The problems that calculation is complex, the calculated amount is large and accuracy is poor due to the fact that the cross section area of the beam unit is determined through artificial experience are solved, and the accuracy of calculating the cross section area of the beam unit is improved.

The invention discloses a method for calculating the equivalent section modulus of a cold-formed thin-walled steel beam with a hole under a pure bend, the cold-formed thin-walled steel beam has a C-shaped section, and long round holes are continuously formed along a web plate; comprising the following steps that the width b of a web straight section of the cold-formed thin-walled steel beam, the height h of a flange straight section, the length d of a curled edge straight section, the plate thickness t, the total length e of an oblong hole, the appearance period S of the oblong hole, the semi-circle radius r of the two ends of the oblong hole and the steel yield strength fy are determined; based on an effective width method, considering local buckling and an oblong hole weakening effect, respectively calculating effective widths of a web, a flange and a curled edge, combining the effective widths to form an equivalent effective section, and calculating an effective area Aeff of the equivalent effective section and a distance eeff from an effective centroid to a center line of the web; and calculating an effective inertia moment Ieff and an equivalent section modulus Weff. According to the method, the section modulus after reduction can be quickly obtained by substituting the geometric dimension once, the method is simple and quick, and high-precision and zero-iteration preposed input can be provided for subsequent deformation checking calculation and flexural capacity design.

The utility model discloses an adjustable high-strength counterweight guide rail bracket, which comprises an upper bracket and a lower bracket, and is characterized in that the upper bracket is of a cross section modulus gradient structure and comprises two surfaces which are perpendicular to each other, a hole matched with a guide rail is formed in the vertical surface, the horizontal surface of the vertical surface is of a trapezoidal structure, and the width of the large bottom edge of the trapezoidal structure is equal to that of the lower bracket; the near-trapezoid large bottom edge part of the horizontal plane is matched and connected with the lower bracket through a bolt; the lower support is also provided with two perpendicular faces, and inner folding rib edges are arranged on the two sides of the width of the lower support. A recognizable and effective installation space is provided, local high stress concentration of the upper support is avoided, and the service life of parts is prolonged; the structural strength of the support is greatly improved on the basis of the same thickness, the thickness of plates can be reduced, the weight of accessories is reduced, and cost is saved; parts can be adjusted under various complex working conditions on site, and the installation precision of the elevator body is guaranteed.

This invention discloses a method for evaluating the static strength of welded structures, comprising: establishing a finite element model of the welded structure and performing finite element static strength calculations using a coarse mesh to locate weld hotspots; refining the mesh at the weld hotspot locations and calculating the total weld stress through internal stress linearization; determining material parameters, including yield strength, tensile strength, elongation at break, Young's modulus, tangent modulus, and total critical strain; determining the section modulus based on the material parameters; determining the welding coefficient based on weld type, weld quality, and stress type; calculating the weld strength based on the section modulus, welding coefficient, and material parameters; determining a safety factor based on the material parameters and an assessment of the consequences of weld failure; and obtaining the evaluation result by comparing the ratio of the weld strength to the safety factor with the total weld stress. This invention can more realistically reflect the stress state at the weld location and improve the accuracy of the evaluation by refining the design parameters.

The invention provides a lifting appliance model selection method, a lifting appliance comprises a cross beam and a bearing plate, the cross beam is connected with the bearing plate, S1, the safety coefficient n of the connecting cross section of the cross beam and the bearing plate is preset, and the yield strength and the cross section limit stress are determined according to the material of the cross beam; s2, calculating a cross section bending moment M according to a preset load pulling force F and a load force arm L of the bearing plate; s3, obtaining a cross section modulus W according to the limit stress and the cross section bending moment M; s4, the cross section modulus W1 is associated with the cross section height H and the cross section width B, and S5, the lifting appliance is manufactured according to the corresponding relation between the cross section height H and the cross section width B, the minimum value of the cross section height and the minimum value of the cross section width, according to the specific structure of the lifting appliance, the structure of the lifting appliance meets the use requirement, and the measuring method is simple and reliable.