复合材料桥墩整体力学性能仿真分析

Simulating Analysis of the Overall Mechanical Behavior of the Piers of Composite Materials

参照八三式铁路轻型军用桥墩的力学性能指标,采用玻纤复合材料设计了铁路抢修桥墩2m长立柱单元,利用ANSYS对9.5m高的2×4、3×3和3×4几种典型等截面拼组形式的复合材料桥墩进行了整体稳定性分析,并对3×4等截面墩身进行了模态分析,得出如下结论:复合材料桥墩单柱失稳对桥墩整体失稳不起控制作用,在实际使用拼组时,需要根据拼组结构形式进行整体稳定性检算;引起桥墩横向振动的荷载频率应尽量避免与第2阶固有频率接近,引起桥墩纵向振动的荷载频率尽量避免与第1阶固有频率接近,以免引起共振。

With the targets of the mechanical behavior of type-83 military bridge piers taken into account,a two-meter-long column unit,which is made of composite glass-fiber materials,is designed in the paper,with the overall stability of the 9.5m-tall piers of composite materials formed with typical cross-sections of 2×4,3×3 and 3×4 analyzed by the software of ANSYS and the body of the 3×4 invariable-cross-sectioned pier modal-analyzed.According to the results of our research,it is concluded that the instability of a single column of the pier of composite materials does not play a controlling role in the overall instability of the whole pier.In the practical use of the assembled units,it is highly desirable that the overall stability of the pier should be checked according to the specific structural forms of the assembled units.The load frequency,which usually results in the lateral vibration of the pier,should be made to avoid approaching the 2nd-level intrinsic frequency,while the load frequency,which usually results in the longitudinal vibration of the pier,should be made to avoid approaching the first-level intrinsic frequency so as to avoid the emergence of resonance.