铁路钢桥环氧沥青柔性保护层在特种活载作用下的力学响应

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (6) : 1-4,9.

论文

铁路钢桥环氧沥青柔性保护层在特种活载作用下的力学响应

钱振东1; 刘云1; 王江洋1; 戴胜勇2; 艾宗良2; 郑彬1

作者信息 +

mechanical response of the flexible layer on railway steel bridges under special live load

Qian Zhen-dong1; Liu Yun1; Wang Jiang-yang1; Dai Shen-yong2; Ai Zong-liang2; Zheng Bin1

Author information +

文章历史 +

摘要

随着铁路钢桥跨径的增大，铁路采用柔性保护层的研究受到重视。本文从铁路钢桥桥面系的结构组成及荷载传递特点出发，建立了高速列车－轨道－环氧沥青柔性保护层－桥梁耦合体系有限元模型，通过典型铁路钢桥面系算例分析可见，保护层竖向位移、横向拉应力、纵向拉应力及钢板与保护层的层间剪应力峰值均出现在ZK特种活载中心作用在距横隔板距离为1/4跨处（定义两横隔板之间距离为一跨）；最大竖向位移发生在荷载作用的中心区域；最大横向拉应力出现在轨枕两侧以及纵肋上方对应的区域；钢板和保护层层间最大纵向剪应力分布在荷载下方轨枕对应的保护层区域。此外，通过室内试验，验证了环氧沥青柔性防水保护体系的抗拉和抗剪切强度满足理论分析结果和规范的要求。本文研究的列车荷载作用下环氧沥青柔性防水保护层的力学响应及其分布规律，可为同类铁路钢桥桥面系保护层设计提供理论依据。

Abstract

With the increasing of railway steel bridge span, the research of flexible layer used in railway is becoming a concern. The high speed train-rail- epoxy asphalt flexible layer-bridge coupling system finite element model is established based on structure composition of railway steel bridge deck and load transfer characteristics. The result of numerical example shows that the peak values of vertical displacement, transversal tension stress, longitudinal tension stress and shear stress between steel deck and flexible layer appear when the center of ZK special live load moves to the quarter of the length between two adjacent diaphragm plates. The maximum vertical displacement appears at the central region of loading, maximum transversal tension stress appears at the corresponding region of side sleepers and longitudinal ribs above and maximum longitudinal shear slip between steel deck and flexible layer appears at the region corresponding to sleepers which are under the load. In addition, tensile strength and shear strength of epoxy asphalt flexible layer system could satisfy the demands of theoretical analysis and specification through laboratory tests. The research results of mechanical response and its distribution law of epoxy asphalt flexible layer under train load can provide theoretical basis for the design of protective layer on similar rail steel bridges.

导出引用

钱振东&#;刘云;王江洋;戴胜勇;艾宗良;郑彬. 铁路钢桥环氧沥青柔性保护层在特种活载作用下的力学响应[J]. 振动与冲击, 2012, 31(6): 1-4,9

Qian Zhen-dong;Liu Yun;Wang Jiang-yang;Dai Shen-yong;Ai Zong-liang;Zheng Bin. mechanical response of the flexible layer on railway steel bridges under special live load[J]. Journal of Vibration and Shock, 2012, 31(6): 1-4,9