A comparative life cycle assessment of structural materials: a case study on TOKİ housing

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2021-9

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Dener Uysal, Ezgi

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In Turkey, the Housing Development Administration of Turkey (TOKİ) has a significant proportion of housing stock and prepares typical housing projects. Reinforced concrete shear wall system (also named as tunnel form system) is preferred in these projects. This reinforced concrete system may have structural advantages but may also have more CO2 emissions. Therefore, the potentials of a steel system in terms of sustainability are investigated in this study. TOKİ buildings are classified according to their typology. Then, a representative typology is selected and modeled as 5-, 10-, and 14-story buildings with reinforced concrete shear-wall and steel braced-frame systems. Structural models are designed and analyzed by the ProtaStructure program for both high and low seismicity levels. A Life Cycle Assessment (LCA) program, OneClickLCA, is used to evaluate the impacts of alternative models on nature according to ecological parameters. Comparing 5-, 10-, and 14-story models with alternative materials shows that steel models have lower negative impacts than reinforced concrete models except for the formation of summer smog and total energy need. On the other hand, the minimum-maximum boundary analysis of 5-story models indicates that the steel model with minimum recycled content is the most harmful model to nature. The results of 5- and 14-story steel models in low seismic regions demonstrate that the harmful effects of steel get lower (steel is more advantageous for the environment) with increasing building height. Consequently, this study shows the potentials of steel compared to reinforced concrete so that a more sustainable approach can be preferred starting from TOKİ projects.

Subject Keywords

TOKİ housing, Structural system, Reinforced concrete tunnel form, Steel braced frame, Life cycle assessment

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https://hdl.handle.net/11511/93117

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

E. Dener Uysal, “A comparative life cycle assessment of structural materials: a case study on TOKİ housing,” M.S. - Master of Science, Middle East Technical University, 2021.