Xiao Bing Xu, Y. Ying, Q. Hu, Yun-chang Chen, Huashan Fang, Haibo Zhu, Minyun Hu
{"title":"双开口支撑h型钢支撑的原位轴向加载试验","authors":"Xiao Bing Xu, Y. Ying, Q. Hu, Yun-chang Chen, Huashan Fang, Haibo Zhu, Minyun Hu","doi":"10.1680/jgeen.21.00102","DOIUrl":null,"url":null,"abstract":"The design of a large excavation using a braced wall system (BWS) with H-shaped steel (HS) struts is introduced. In-situ axial loading tests were conducted to study the load transfer and deformation mechanisms of a HS strut with double splay supports. The monitoring results indicate that the outer splay support withstands the most lateral earth pressure (48.5%), followed by the inner splay support (35.6%) and BC segment of end support (15.9%). The safety redundancies of strength and stability for the outer and inner splay supports, AB and BC segments of end support are all larger than 1.59. The axial deformations of the middle support and the whole strut tend to increase linearly with the loading process. Using the monitored total load of hydraulic jacks, the value of KT″ of the whole strut is estimated to be 158∼189 MN/m. The modified value of KT″ (KT″ba/S) of the whole strut is 2.2∼2.6 MN/m. It is close to the lower limit of the suggested range (2.5∼3.5 MN/m) in the Chinese standard. The monitored data of typical safety control parameters during soil excavation and the monitored results during in-situ loading tests indicate good performance of the BWS with HS struts in this project.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":"44 1","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"In-situ axial loading tests on H-shaped steel strut with double splay supports\",\"authors\":\"Xiao Bing Xu, Y. Ying, Q. Hu, Yun-chang Chen, Huashan Fang, Haibo Zhu, Minyun Hu\",\"doi\":\"10.1680/jgeen.21.00102\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The design of a large excavation using a braced wall system (BWS) with H-shaped steel (HS) struts is introduced. In-situ axial loading tests were conducted to study the load transfer and deformation mechanisms of a HS strut with double splay supports. The monitoring results indicate that the outer splay support withstands the most lateral earth pressure (48.5%), followed by the inner splay support (35.6%) and BC segment of end support (15.9%). The safety redundancies of strength and stability for the outer and inner splay supports, AB and BC segments of end support are all larger than 1.59. The axial deformations of the middle support and the whole strut tend to increase linearly with the loading process. Using the monitored total load of hydraulic jacks, the value of KT″ of the whole strut is estimated to be 158∼189 MN/m. The modified value of KT″ (KT″ba/S) of the whole strut is 2.2∼2.6 MN/m. It is close to the lower limit of the suggested range (2.5∼3.5 MN/m) in the Chinese standard. The monitored data of typical safety control parameters during soil excavation and the monitored results during in-situ loading tests indicate good performance of the BWS with HS struts in this project.\",\"PeriodicalId\":54572,\"journal\":{\"name\":\"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering\",\"volume\":\"44 1\",\"pages\":\"\"},\"PeriodicalIF\":2.0000,\"publicationDate\":\"2022-04-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1680/jgeen.21.00102\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, GEOLOGICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1680/jgeen.21.00102","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
In-situ axial loading tests on H-shaped steel strut with double splay supports
The design of a large excavation using a braced wall system (BWS) with H-shaped steel (HS) struts is introduced. In-situ axial loading tests were conducted to study the load transfer and deformation mechanisms of a HS strut with double splay supports. The monitoring results indicate that the outer splay support withstands the most lateral earth pressure (48.5%), followed by the inner splay support (35.6%) and BC segment of end support (15.9%). The safety redundancies of strength and stability for the outer and inner splay supports, AB and BC segments of end support are all larger than 1.59. The axial deformations of the middle support and the whole strut tend to increase linearly with the loading process. Using the monitored total load of hydraulic jacks, the value of KT″ of the whole strut is estimated to be 158∼189 MN/m. The modified value of KT″ (KT″ba/S) of the whole strut is 2.2∼2.6 MN/m. It is close to the lower limit of the suggested range (2.5∼3.5 MN/m) in the Chinese standard. The monitored data of typical safety control parameters during soil excavation and the monitored results during in-situ loading tests indicate good performance of the BWS with HS struts in this project.
期刊介绍:
Geotechnical Engineering provides a forum for the publication of high quality, topical and relevant technical papers covering all aspects of geotechnical research, design, construction and performance. The journal aims to be of interest to those civil, structural or geotechnical engineering practitioners wishing to develop a greater understanding of the influence of geotechnics on the built environment.