Safety analysis method of main longitudinal beam of highway heavy-goods transport trailer

Abstract

The invention discloses a safety analysis method of a main longitudinal beam of a highway heavy-goods transport trailer. The method includes the steps of statically-indeterminate mechanical analysis of main-beam stress of the large-goods transport axis vehicle; calculation of arbitrary-position deflection of a variable-stiffness cantilever beam under the action of single-form force; calculation ofarbitrary-position deflection of a variable-stiffness simply-supported-beam under the action of single-form force; calculation of arbitrary-position deflection of a vehicle frame under the action ofsingle-form force; solving of shear force, a bending moment and deflection of an arbitrary position of the vehicle frame; and arrangement of optimal support and reinforcement beams of the vehicle frame. The method has the advantages of: precisely calculating a bending moment, shear force and deflection on each point of the longitudinal beam of the vehicle frame, verifying safety thereof, and providing a method of goods bracket setting and vehicle-frame strength reinforcement position and size setting under support of calculated specific data.

Description

technical field [0001] The invention relates to the technical field of transportation safety, in particular to a method for analyzing the safety of a main longitudinal beam of a road trailer for transporting heavy goods. Background technique [0002] The transportation of heavy cargo plays a very important role in the construction of major national projects. During the transportation of heavy cargo, it is necessary to ensure the safety of the transportation of heavy cargo. important content. [0003] The traditional method of checking the strength of trailer longitudinal beams is to find out the allowable bearing capacity of the fulcrum position according to the fulcrum position-bearing capacity curve provided in the manual, and check whether the actual supporting force is less than the allowable bearing capacity [1]. The fulcrum position-bearing capacity curve is the allowable bearing capacity at different fulcrum positions calculated by the trailer manufacturer on the con...

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Problems solved by technology

Considering the variable cross-section of the beam, literature [12] proposes to use the three-moment equation to analyze the force of the beam, and then calculate the stress and bending moment at each point of the main longitudinal beam of the trailer. Literature [1] uses this The method is applied to the longitudinal strength check of the trailer, but this method needs to calculate the area of ​​the bending moment diagram of each span under the action of the internal load of the span. When calculating the deflection, the converted bending moment diagram of the main beam of the trailer is used as the virtual beam in the calculation method of the conjugate beam. The imaginary load distribution diagram of the actual beam is obtained, and the small area of ​​the imaginary distributed load and the position of the center of gravity between two adjacent coordinates corresponding to the coordinates of the actual beam stress points are calculated, and then the deformation of the section is calculated, and the bending moment diagram is mostly irregular. The calculation of its area is cumbersome, and the solution process of this method is more complicated and the amount of calculation is larger

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