Experimental investigation on shear steel bars in CRTS II slab ballastless track under low-cyclic reciprocating load

doi:10.1016/j.conbuildmat.2020.119425

	Experimental investigation on shear steel bars in CRTS II slab ballastless track under low-cyclic reciprocating load
	Feng, Yulin 3,4; Jiang, Lizhong 1,3; Zhou, Wangbao 1,3; Han, Jianping 2; Zhang, Yuntai 1,3; Nie, Leixin 1,3; Tan, Zhihua 1,3; Liu, Xiang 1,3
刊名	Construction and Building Materials
	2020-09-20
卷号	255
关键词	Concrete slabs Connectors (structural) Energy dissipation Failure (mechanical) Load testing Mortar Railroad tracks Railroad transportation Railroads Seismic waves Seismology Stiffness Energy dissipation capacities Experimental investigations High speed railways Seismic Performance Slab ballastless track Stiffness degradation Strength and stiffness Strength degradation
ISSN号	09500618
DOI	10.1016/j.conbuildmat.2020.119425
英文摘要	To study the seismic behavior of shear steel bar in high-speed railway CRTS II slab ballastless track, low-cycle reciprocating load tests were carried out on 6 high-speed railway CRTS II slab ballastless track specimens with different shear steel bar quantity and diameter. The failure mode, hysteretic curve, skeleton curve, energy dissipation capacity, ductility, stiffness degradation law and strength degradation law of the shear steel bars were examined. The influence of the quantity and diameter of shear steel bars on seismic performance of the track was analyzed, and the deformation process and failure mechanism of shear steel bar under the action of low-cyclic reciprocating load was revealed. Results showed that the deformation process can be divided into three stages: a) the interface between track slab and CA mortar layer cracks, and shear deformation of the shear steel bar occurs; b) the shear steel bar repeatedly compresses the CA mortar layer and adjacent track slab concrete around it, and bending deformation of the shear steel bar occurs; c) the CA mortar layer and track slab concrete around shear steel bar are crushed, and the shear steel bar undergoes tensile deformation until it fractures. The failure mechanism of shear steel bar under the action of low-cyclic reciprocating load was not instantaneous clipping, but a kind of "fracture" between clipping and a pull cut. The larger the quantity and diameter of the shear steel bar, the stronger the energy dissipation capacity of the specimen and the better the seismic performance of the ballastless track. Increasing the quantity and diameter of the shear steel bar can effectively reduce strength and stiffness degradation of track under the action of low-cycle reciprocating load. © 2020 Elsevier Ltd
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
语种	英语
出版者	Elsevier Ltd
WOS记录号	WOS:000539386100080
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/151166]
专题	教务处（创新创业学院）
作者单位	1.National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha; 410075, China; 2.Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou; 730050, China 3.School of Civil Engineering, Central South University, Changsha; 410075, China; 4.School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang; 330013, China;
推荐引用方式 GB/T 7714	Feng, Yulin,Jiang, Lizhong,Zhou, Wangbao,et al. Experimental investigation on shear steel bars in CRTS II slab ballastless track under low-cyclic reciprocating load[J]. Construction and Building Materials,2020,255.
APA	Feng, Yulin.,Jiang, Lizhong.,Zhou, Wangbao.,Han, Jianping.,Zhang, Yuntai.,...&Liu, Xiang.(2020).Experimental investigation on shear steel bars in CRTS II slab ballastless track under low-cyclic reciprocating load.Construction and Building Materials,255.
MLA	Feng, Yulin,et al."Experimental investigation on shear steel bars in CRTS II slab ballastless track under low-cyclic reciprocating load".Construction and Building Materials 255(2020).