【摘要】 基于有限元理论,借助通用计算程序ANSYS对一实桥建立有限元模型,结合检测结果,分析了该桥在不同荷载工况下挠度、应力、自振频率以及振型特征的变化趋势,研究了加固前后桥梁结构的静、动力特性.结果表明:锚喷混凝土加固小铰缝板桥有效地降低板梁截面的应力和应变,提高桥梁结构的自振频率.由此可知,锚喷混凝土加固可提高结构的整体刚度,增强结构的抗弯及抗扭能力,改善桥梁整体受力特性,具有较高的推广应用价值.更多还原

【Abstract】 Based on the theory of finite-element,some models of a bridge are built with the large-scale finite element analysis software ANSYS.After analyzing the changing trend of deflection,stress,natural vibration frequency and mode of structure under different loads,comparing the measuring result of the real bridge,the mechanics characteristics of the structure are studied.The result shows that the stress and strain of bridge section reduce sharply after being strengthened,and the structure’s natural vibration frequency is enhanced.Consequently,the structure’s whole rigid,bending resistance and twisting strength are augmented,and capacity of bridge is remarkably enhanced,the strengthening method therefore is worth applying.更多还原