关键词: 聚氨酯, 复合材料, 步行板, 有限元分析, 力学性能

Abstract: Based on the engineering experience and simulation method, the composite walking board with equal stiffness was designed, and the structural configuration and cross-section geometric dimensions of the composite walking board were determined. Test pieces of three kinds of felt paving methods are prepared and tested by pultrusion process. The results show that the mechanical properties of the walking board of three kinds of felt paving methods meet the standard requirements. The minimum deflection span ratio is 1/342, the bearing capacity can reach 35.4 kN, and the micro strain of the walking board changes linearly with the load before failure. Comparing the simulation results with the actual test results, it is found that the deflection value of each rib is close to the actual test results, and the change trend is consistent, which can provide theoretical data for the structural design of walking board. The pedestrian board designed and prepared in this paper can meet the requirements of railway bridge and culvert design code.

Key words: polyurethane, composite, walking board, finite element analysis, mechanical property