气候变化领域集成服务门户(CCPortal): Experimental study of frozen soil effect on seismic behavior of bridge pile foundations in cold regions

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DOI	10.1016/j.istruc.2021.03.119
	Experimental study of frozen soil effect on seismic behavior of bridge pile foundations in cold regions
	Zhang, Xiyin; Yang, Zhaohui (Joey); Chen, Xingchong; Guan, Jiada; Pei, Wansheng; Luo, Tao
通讯作者	Zhang, XY (通讯作者)，Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou, Peoples R China.
发表日期	2021
ISSN	2352-0124
起始页码	1752
结束页码	1762
卷号	32
英文摘要	Ground seasonal freezing and thawing in cold regions can alter boundary conditions of bridge pile foundations and influence their seismic behaviors. This article describes a test apparatus with a custom-designed cooling system for investigating the seismic behavior of pile foundations in seasonally frozen ground. Two 1/8-scale models of a reinforced concrete bridge pier with pile foundations were fabricated for conducting quasi-static tests under unfrozen and frozen conditions. Test observations and data were used to analyze failure characteristics of pile foundation subjected to cyclic lateral loading under the two conditions and reveal the frozen soil effects. It was found that ground freezing greatly enhanced the loading carrying capacity while partly weakened the deformation capacity of the pile-soil system. It is not easy to fail if upper layer soil was frozen, and the frozen soil layer shifted the pile failure zone upward compared with the unfrozen condition. The strength degradation was obvious in the pile-soil system under frozen condition due to the fracture of the steel bar. Furthermore, the pile foundation in frozen soils exhibited more stable and reliable energy dissipation than the pile foundation in unfrozen soils under large seismic load, which was attributed to the severe damage of the pile foundation in frozen soils. A simplified force-displacement model was proposed for the pile-soil system under unfrozen and frozen conditions based on the testing results. These results can provide references for seismic design of reinforced concrete pile foundations in cold regions.
关键词	LATERALLY LOADED PILES QINGHAI-TIBET PLATEAU SEASONALLY FROZEN PERMAFROST COLUMN PERFORMANCE WARM
英文关键词	Quasi-static test; Frozen soil effect; Bridge pile foundation; Seismic behavior
语种	英语
WOS研究方向	Engineering
WOS类目	Engineering, Civil
WOS记录号	WOS:000657776700002
来源期刊	STRUCTURES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254579
作者单位	[Zhang, Xiyin; Chen, Xingchong; Guan, Jiada] Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou, Peoples R China; [Yang, Zhaohui (Joey)] Univ Alaska Anchorage, Dept Civil Engn, Anchorage, AK USA; [Pei, Wansheng] Chinese Acad Sci, Northwest Inst Ecoenviron & Resources, State Key Lab Frozen Soil Engn, Lanzhou, Peoples R China; [Luo, Tao] Xijing Univ, Shanxi Key Lab Safety & Durabil Concrete Struct, Xian, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xiyin,Yang, Zhaohui ,Chen, Xingchong,et al. Experimental study of frozen soil effect on seismic behavior of bridge pile foundations in cold regions[J]. 中国科学院西北生态环境资源研究院,2021,32.
APA	Zhang, Xiyin,Yang, Zhaohui ,Chen, Xingchong,Guan, Jiada,Pei, Wansheng,&Luo, Tao.(2021).Experimental study of frozen soil effect on seismic behavior of bridge pile foundations in cold regions.STRUCTURES,32.
MLA	Zhang, Xiyin,et al."Experimental study of frozen soil effect on seismic behavior of bridge pile foundations in cold regions".STRUCTURES 32(2021).