51 results about "Beam finite elements" patented technology

The invention relates to an evaluation method of earthquake resistant performance of a steel tube concrete building. A building support component is formed by steel tube concrete. The evaluation method comprises the following steps of establishing a space fiber beam finite element model of the steel tube concrete building, developing an analysis method suitable for a fiber beam, considering that the confinement effect and the material characteristic of the elasto-plasticity under earthquake cyclic loading damage a constitutive model and a corresponding subprogram, calculating the finite element model by adopting a software and combining with the material subprogram, evaluating the earthquake resistant performance, and designing the earthquake resistant measure of the building. In the provided evaluation method of the earthquake resistant performance of the steel tube concrete building, the earthquake resistant performance of the building is evaluated on the basis of the maximum inter-story displacement angle limit value required by a steel tube concrete structure by establishing the space fiber beam finite element model of the steel tube concrete building, developing the analysis method suitable for the fiber beam, considering that the confinement effect and the material characteristic of the elasto-plasticity under earthquake cyclic loading damage the constitutive model, calculating the finite element model by adopting the software and obtaining the maximum inter-story displacement angle of the building, and building earthquake resistant measures are planed according to the evaluation result of the earthquake resistant performance of the building.

The invention discloses a bridge finite element model modifying method, which comprises the following steps that: 1, an entity finite element model of a whole bridge is built by universal finite element calculation software ANSYS; and 2, the entity finite element model of the whole bridge is subjected to primary modification by a uniform design method. The bridge finite element model modifying method has the following advantages that the uniform design method is used as a test optimization design method with obvious superiority, and the application of the uniform design method to the bridge structure finite element model modification is feasible; on the basis of the uniform design method, a more correct result can be found in a very short time by the uniform design method in the efficiency aspect, and the bridge large-scale finite element model modification efficiency is improved; a response surface method is used as a test design and mathematical statistics combined mathematical analysis method, and the application of the response surface method to the finite element model modification of a large-scale complicated bridge structure is feasible; and higher modification efficiency and higher modification precision can be ensured at the same time.

The invention relates to a heavy double-column vertical lathe cross beam gravity deformation prediction method based on a finite difference method. Due to the fact that an existing finite element analysis computing method cannot accurately calculate a cross beam gravity deformation curve on the condition that actual materials have not uniform attributes, the calculation result much differs from an actual deformation value. The heavy double-column vertical lathe cross beam gravity deformation prediction method based on the finite difference method comprises the steps that actual assembling conditions are simulated to design a heavy machine tool cross beam self-weight deformation experiment to obtain a self-weight deformation curve. By means of the material mechanical theory, a cross beam is simplified into a simply supported beam mechanical model and then made into micro segments through discretization, and a cross beam gravity deformation discretization model is built on the basis of the finite difference method; the equivalent weight bending rigidity of each discrete micro segment is calculated; the cross beam finite element gravity deformation curve is calculated; the equivalent weight bending rigidity is utilized for correcting the cross beam finite element gravity deformation curve on the basis of the finite difference method to obtain a final cross beam gravity deformation curve. The heavy double-column vertical lathe cross beam gravity deformation prediction method is applied to heavy double-column vertical lath cross beam gravity deformation curve calculation.

The present invention proposes a bridge dynamic deflection monitoring method based on the optimized arrangement of inclinometers, which includes: establishing an inclination-dynamic deflection conversion equation, simulating bridge deck passing vehicles in the bridge finite element model, and extracting the inclination time of candidate nodes for inclinometer layout The process data and the displacement time history data of key bridge sections are used as the data set for genetic algorithm optimization training. In the optimization process, information entropy is used as the fitness function, so as to obtain the optimal layout position of the inclinometer under a fixed number and the corresponding information entropy. The critical information entropy is determined with the relative error of the time-history displacement of the key section of the bridge in the predicted finite element model equal to 5% as the limit, and the information less than or equal to the critical information is found in the information entropy corresponding to the number of sensors under the optimal arrangement of the inclinometer. The minimum value of the number of sensors in the entropy is the optimal number of sensors, and the optimal layout position corresponding to the optimal number of sensors is the layout position of the inclinometer. This method can accurately predict the dynamic deflection of the bridge.