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基于ANSYS平台对上承式现代竹拱桥的力学性能进行了数值分析,计算出竹拱桥结构的强度(应力)、刚度(变形)值以及自振频率。为优化结构,建立了10个不同矢跨比拱桥模型,分别对它们的拱圈弯矩、轴力、挠度和拱脚处反力值以及自振频率等进行比较,从而获取合理矢跨比。结果表明:该结构拱圈应力远小于竹胶板抗压强度值,而其刚度要求成为设计控制指标。随矢跨比变化,拱圈弯矩、挠度与竖向频率呈抛物线形变化;拱圈轴力、侧向频率及拱脚处反力呈折线段变化。该拱桥合理矢跨比为1/3.6。
Based on the ANSYS platform, the mechanical properties of the traditional bamboo arch bridge are numerically analyzed, and the strength (stress), stiffness (deformation) value and natural frequency of the bamboo arch bridge are calculated. In order to optimize the structure, 10 different span-span arch bridges models were established, and their arch moment, axial force, deflection and reaction force at the arch foot and natural frequency were compared respectively to obtain a reasonable ratio of span to span. The results show that the stress of the arch ring is much smaller than the compressive strength value of bamboo plywood, and its stiffness requirements become the design control index. With the change of span-span ratio, the moment, deflection and vertical frequency of the arch ring show a parabolic curve. The axial force of the arch ring, the lateral frequency and the reaction force at the arch foot change in a broken line segment. The arch of the rational ratio of 1 / 3.6 span.