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By using two\u2010way spanning ribbed slabs, concrete consumption could be significantly reduced. However, due to the high costs associated with formwork, such a complex rib configuration is rarely used nowadays. With the advent of technologies for automated formwork fabrication, the material\u2010saving potential inherent in this structural system could again be exploited. This paper investigates the feasibility of material\u2010efficient ribbed concrete slabs on a building scale using conventional concrete and steel reinforcing bars cast inside a three\u2010dimensional\u2010printed plastic\u2010based formwork. To that end, the code\u2010compliant design of ribbed slabs is first discussed, followed by the introduction of a concept for an automated design\u2010to\u2010production workflow. The sustainability of this slab system is compared to a solution using conventional formwork in a case study consisting of a multibay office building with slabs spanning 8\u00a0m in both directions, revealing that ribbed slabs use 40% less concrete than solid slabs. Several representative structural elements of the case study (ribs, slab\u2010column transition) were produced at full\u2010scale and tested until failure to investigate the feasibility of production and structural performance. Three T\u2010beams with various rib shapes (straight, kinked with diaphragms, curved) were tested in a three\u2010point bending configuration, showing a ductile behavior with longitudinal reinforcement yielding and indicating the relevance of torsional effects in curved ribs. Punching tests on two slab\u2010column connections (ribbed, solid) revealed that the optimized ribbed slab could prevent brittle punching failures and achieve an ultimate load 105% higher than the solid reference slab. All specimens' load\u2010bearing behavior could be predicted using established design formulas, showing the feasibility of producing code\u2010compliant ribbed slabs with the applied technology.<\/jats:p>","DOI":"10.1002\/suco.202200633","type":"journal-article","created":{"date-parts":[[2023,3,2]],"date-time":"2023-03-02T06:56:26Z","timestamp":1677740186000},"page":"1932-1955","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Structural design and testing of material optimized ribbed RC slabs with 3D printed formwork"],"prefix":"10.1002","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9248-1662","authenticated-orcid":false,"given":"Tobias","family":"Huber","sequence":"first","affiliation":[{"name":"Institute of Structural Engineering ETH Zurich  Zurich Switzerland"},{"name":"Institute of Structural Engineering TU Wien  Vienna Austria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6116-8091","authenticated-orcid":false,"given":"Joris","family":"Burger","sequence":"additional","affiliation":[{"name":"Institute of Technology in Architecture ETH Zurich  Zurich Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8701-4410","authenticated-orcid":false,"given":"Jaime","family":"Mata\u2010Falc\u00f3n","sequence":"additional","affiliation":[{"name":"Institute of Structural Engineering ETH Zurich  Zurich Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8415-4896","authenticated-orcid":false,"given":"Walter","family":"Kaufmann","sequence":"additional","affiliation":[{"name":"Institute of Structural Engineering ETH Zurich  Zurich Switzerland"}]}],"member":"311","published-online":{"date-parts":[[2023,3,2]]},"reference":[{"key":"e_1_2_13_2_1","first-page":"6","article-title":"Verfahren zur Herstellung von Decken bezw","volume":"12365","author":"Hennebique F","year":"1903","journal-title":"Fu\u00dfb\u00f6den aus armiertem Beton"},{"key":"e_1_2_13_3_1","doi-asserted-by":"publisher","DOI":"10.1061\/(ASCE)0733-9445(2002)128:10(1243)"},{"key":"e_1_2_13_4_1","doi-asserted-by":"publisher","DOI":"10.1061\/(ASCE)0733-9445(1997)123:8(1102)"},{"key":"e_1_2_13_5_1","unstructured":"HalpernAB BillingtonDP AdriaenssensS.The ribbed floor slab systems of Pier Luigi Nervin.d.:7."},{"key":"e_1_2_13_6_1","doi-asserted-by":"publisher","DOI":"10.1088\/1748-3182\/9\/1\/016013"},{"key":"e_1_2_13_7_1","volume-title":"Towards a zero\u2010emission, efficient and resilient buildings and construction sector","author":"2020 Global Status Report for Buildings and Construction","year":"2020"},{"key":"e_1_2_13_8_1","volume-title":"The European green deal","year":"2019"},{"key":"e_1_2_13_9_1","doi-asserted-by":"publisher","DOI":"10.1061\/(ASCE)AE.1943-5568.0000397"},{"key":"e_1_2_13_10_1","first-page":"84","volume-title":"3D printed formwork for concrete: state\u2010of\u2010the\u2010art, opportunities, challenges, and applications","author":"Jipa A","year":"2021"},{"key":"e_1_2_13_11_1","doi-asserted-by":"publisher","DOI":"10.21809\/rilemtechlett.2016.16"},{"key":"e_1_2_13_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.istruc.2018.03.001"},{"key":"e_1_2_13_13_1","doi-asserted-by":"publisher","DOI":"10.21809\/rilemtechlett.2022.161"},{"key":"e_1_2_13_14_1","volume-title":"Costas Georgopoulos and Andrew Minson (eds): Sustainable concrete solutions","year":"2016"},{"key":"e_1_2_13_15_1","doi-asserted-by":"publisher","DOI":"10.3390\/su12208532"},{"key":"e_1_2_13_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cemconres.2022.106948"},{"key":"e_1_2_13_17_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-030-49916-7_102"},{"key":"e_1_2_13_18_1","doi-asserted-by":"publisher","DOI":"10.52842\/conf.acadia.2018.434"},{"key":"e_1_2_13_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.engstruct.2017.01.075"},{"key":"e_1_2_13_20_1","first-page":"1","volume-title":"In: L\u00e1zaro C, Bletzinger KU, O\u00f1ate E, editors. 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