平板网架-悬索桥的自振特性分析

利用空间网架结构刚度大而悬索结构刚度较低的特点,提出采用网架结构代替常规悬索桥的加劲梁,构成平板网架-悬索桥.探讨相应结构的受力特征,并以108国道陕西和山西交界的禹门口黄河公路120 m的悬索桥为实例,建立整体结构的分析模型,利用ANSYS有限元软件对该结构体系进行自振特性的分析计算,得到该桥型的横向、竖向、纵向、扭转以及耦合振动的频率和振型.分析结果表明,由于索、杆和空间网架结构的共同工作效应,使得这种体系的整体刚度好,抵抗变形能力强,动力性能优越.

Analysis of free-vibration performance of suspension bridge with space truss by plate-latticed girder

Taking into consideration of the case that the rigidity of spatial latticed girder construction was higher than that of suspended cable construction, it was proposed that the latticed girder was used to construct a suspension bridge with truss stiffened by plate-latticed girder instead of the conventional stiffening truss. The kinetic characteristics of the structure was analyzed. An analysis model of overall structure was set up for an actual engineering practice, its free-vibration characteristics was analyzed and computed, so that the frequency and vibration pattern of its lateral, vertical, longitudinal, torsional, and coupled vibration were obtained. It was shown by the analysis results that, due to the cooperative working effect of the cables, rods, and spatial latticed girders, the overall rigidity of this system was made better, anti-deformation ability higher, and dynamic performance superior.