{"corpus_id":133653854,"paper_sha":"d088164415f250d60a80580eade3961c18cd9760","doi":"10.1016/J.ISTRUC.2018.11.014","arxiv_id":null,"pmid":null,"pmcid":null,"mag_id":2901677122,"dblp_id":null,"acl_id":null,"title":"Sharanam: Case Study of a 15 Meter Span Earthen Conical Vault","year":2019,"publication_date":"2019-04-01","venue":"Structures","journal":{"name":"Structures","pages":null,"volume":null},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":["Engineering","Geology"],"reference_count":23,"citation_count":5,"influential_citation_count":0,"is_open_access":false,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":null,"s2_open_access_landing_url":null,"s2_open_access_license":null,"s2_open_access_status":null,"pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"Abstract This paper presents a case study of the structural design and construction of a 15 meter span conical vault, a low rise, unreinforced masonry shell which was built with compressed stabilized earth block in the “free-spanning” vaulting technique. While large span vaults of this size are not a new contribution to the field, earthen vaults are rarely built at this scale or these proportions, and those which are tend to have greater structural redundancy. With a maximum span of 15 m, maximum rise of 2.5 m, and a thickness varying from 24 cm at the base to 17.7 cm at the crown, extensive symmetrical and asymmetrical stability analyses had to be undertaken to ensure adequate safety, particularly for construction loads and for the high potential cyclone wind conditions on the southeast coast of India. The vault was first studied with graphical thrust line analysis using an optimization method developed by the Auroville Earth Institute (AVEI) for vaults of varying thickness, then replicated with the Finite Element Thrust Line Analysis (FETLA) method. The paper will address boundary condition design, as well as the high degree of precision required in the shell construction to meet the assumptions of analysis and ensure stability. The results of this work point the way toward larger span constructions with low strength, low embodied energy materials through greater coordination of material, structural and constructive logics.","claims":[{"public_id":"cl_3c469f3152ed32fd37180c333fa9bae1","status":"active","text":"A 15 meter span earthen conical vault was built as a low-rise, unreinforced masonry shell using compressed stabilized earth blocks and a free-spanning vaulting technique.","confidence":0.98,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_3c469f3152ed32fd37180c333fa9bae1"},{"public_id":"cl_2c4f79df948977b5c482639fb72aeda6","status":"active","text":"Boundary condition design and high construction precision were necessary to satisfy the analysis assumptions and maintain vault stability.","confidence":0.9,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_2c4f79df948977b5c482639fb72aeda6"},{"public_id":"cl_d4b3e9557df7036ba3935dd46b2a86ec","status":"active","text":"Extensive symmetrical and asymmetrical stability analyses were required to ensure safety under construction loads and high cyclone wind conditions on the southeast coast of India.","confidence":0.93,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_d4b3e9557df7036ba3935dd46b2a86ec"},{"public_id":"cl_52b09805c3a31b5b19d9583c05a99fd6","status":"active","text":"Graphical thrust line analysis with an AVEI optimization method was used first and then replicated with finite element thrust line analysis 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