聚氨酯复合材料步行板结构设计及力学性能研究

The study of structural design and mechanical propeties of polyurethane composite walking board

本文基于工程经验和模拟仿真相结合的方法设计了等刚度复合材料步行板,确定了复合材料步行板的结构构型和横截面几何尺寸,采用拉挤成型工艺制备了三种铺毡方式的试验件并进行了测试,结果表明三种铺毡方式的步行板力学性能均满足标准要求,挠跨比最低为1/342,承载力可达35.4 kN,且步行板在破坏之前微应变和载荷呈线性变化关系。仿真模拟分析结果与实际测试结果对比发现,各肋挠度值与实际测试结果接近,且变化趋势一致,可以为步行板的结构设计提供理论数据。本文设计并制备的步行板可以满足铁路桥涵设计规范的要求。

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.