摘要
根据等刚度替换原则,采用不同直径玄武岩纤维复合筋和钢-玄武岩纤维复合筋分别替换CRTSⅢ型预应力轨道板内普通钢筋试制轨道板,并通过静载试验对两种玄武岩纤维筋轨道板与CRB600H普通钢筋轨道板的受力性能进行对比分析。结果表明:三种筋材轨道板的开裂荷载无明显差异,两种玄武岩纤维筋轨道板静载抗裂性能均满足标准要求;加载至约3倍检验荷载时,普通钢筋轨道板内钢筋屈服导致轨道板变形和裂缝宽度急剧增加,无法继续承载,而两种玄武岩纤维筋轨道板仍处于弹性变形阶段,筋材强度储备较大;应用玄武岩纤维筋时可结合材料特点进一步优化配筋方案,以减少筋材用量,降低轨道板的制造成本。
According to the principle of equal stiffness replacement,basalt fiber composite bar and steel-basalt fiber composite bar with different diameters were used to replace the ordinary steel bar in CRTSⅢprestressed track slab respectively.The mechanical behavior of track slab with two kinds of basalt fiber bar and CRB600H ordinary steel bar were compared and analyzed through static load test.The results show that there is no obvious difference in the cracking load of the three kinds of reinforced track slabs,and the crack resistance of track slab with two kinds of basalt fiber bar meets the standard requirements under static load.When the load is about 3 times of the inspection load,the yielded bar in the track slab with ordinary steel bar leads to the sharp increase of the deformation and crack width of the track slab,which can not continue to bear the load,while the track slab with two kinds of basalt fiber bar is still in the stage of elastic deformation,and the strength reserve of the reinforcement is large.When basalt fiber bar is applied,the reinforcement scheme can be further optimized in combination with the material characteristics,so as to reduce the amount of reinforcement and cut the manufacturing cost of track slab.
作者
施成
SHI Cheng(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)
出处
《铁道建筑》
北大核心
2021年第10期109-112,共4页
Railway Engineering
基金
中国铁道科学研究院集团有限公司基金(2020YJ048)
浙江省重点研发计划(2021C01029)。
关键词
铁路轨道
玄武岩纤维
试验研究
轨道板
无砟轨道
静载试验
复合材料
railway track
basalt fiber
experimental study
track slab
ballastless track
static load test
composite material
