温度荷载下桥上CRTSⅡ型无砟轨道结构层间位移试验研究

来源期刊:中南大学学报(自然科学版)2020年第8期

论文作者:赵磊 周凌宇 张营营 余志武 张广潮 袁亚慧

文章页码:2093 - 2102

关键词:高速铁路桥;无砟轨道;温度梯度;层间位移

Key words:high speed railway bridge; ballastless track; temperature gradient; interlaminar displacement

摘    要:为研究温度荷载下,高速铁路简支梁桥上CRTS Ⅱ型板式无砟轨道结构层间位移的分布特点,开展无砟轨道-简支梁桥1/4缩尺模型温度荷载试验。采用远红外加热灯管结合温控系统及温度传感器模拟升温过程和降温过程,分析实测温度模式下无砟轨道层间位移的分布规律。研究结果表明:随着温度升高,轨道板、CA砂浆和底座板三者之间的纵向相对位移整体呈非线性增大趋势;轨道板相对底座板,底座板相对于梁体,它们的纵向位移零点分别发生在L/8截面和3L/8截面上(L为跨度);位移零点处轨道结构层发生挤压,使轨道结构产生局部上拱;随着温度升高,轨道板与底座板之间、底座板与梁体之间竖向相对位移不断增大,竖向相对位移在L/4截面上出现峰值,梁体沿桥纵向随温度的升高逐渐上拱,当温度降低时,上拱位移逐渐减小。

Abstract: To study the distribution characteristics of interstory displacement of CRTS type Ⅱ slab ballastless track structure on simply supported beam bridge of high speed railway under temperature load, the temperature test was conducted on a 1/4 scaled specimen of ballastless frack-bridge structural system. In this experiment, far infrared heating lamp combined with temperature control switch and temperature sensors was used to simulate the increase and decrease of temperature. The distribution of displacement between ballastless track layers in the measured temperature mode was analyzed. The results show that, the longitudinal relative displacement between track slab, CA mortar and track bed shows a nonlinear trend. The longitudinal zero displacement between the track slab and the track bed, and that between the track bed and the beam are located at the L/8 section and the 3L/8 section(L is span), respectively. With the increase of temperature, the vertical relative displacement between the track slab and the track bed increases, and the vertical relative displacement between the track bed and the beam increases, and the vertical relative displacement displays the peak displacement on the L/4 section. Along the longitudinal direction of the bridge, the beam body gradually reaches the arch with the increase of temperature, and the displacement of the upper arch decreases with the decrease of temperature.

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