Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Performance of round-ended recycled aggregate CFST stub columns after fire exposure
Abstract The post-fire performance of round-ended recycled aggregate concrete-filled steel tubular (RE-RACFST) short columns has been investigated experimentally and numerically. The test parameters included cross-section aspect ratios, recycled aggregate replacements and steel ratios. Twelve short columns were first heated for 90 min following ISO 834 standard fire, followed by natural cooling. Subsequently, axial compressive tests were performed to obtain the damage mode, load versus axial deformation, and strain development of the columns. The test results revealed that a higher level of recycled aggregate content resulted in decreased bearing capacity and elastic stiffness of RE-RACFSTs, and an earlier onset of the confining effect. Furthermore, finite element (FE) models were established and benchmarked against the experimental results. Parametric investigations were then conducted to study the effects of key factors on the residual load-carrying capacity. Finally, according to the experimental and FE results, a simplified formula was proposed to estimate the post-fire residual capacity of RE-RACFST stub columns.
Highlights Post-fire compression tests on RE-RACFST short columns Damage mode, load vs. axial deformation, and strain development Effects of material strengths, cross-sectional dimensions, steel ratios, CRA replacement levels and heating time Simplified formula for estimating the post-fire residual capacity of RE-RACFSTs.
Performance of round-ended recycled aggregate CFST stub columns after fire exposure
Abstract The post-fire performance of round-ended recycled aggregate concrete-filled steel tubular (RE-RACFST) short columns has been investigated experimentally and numerically. The test parameters included cross-section aspect ratios, recycled aggregate replacements and steel ratios. Twelve short columns were first heated for 90 min following ISO 834 standard fire, followed by natural cooling. Subsequently, axial compressive tests were performed to obtain the damage mode, load versus axial deformation, and strain development of the columns. The test results revealed that a higher level of recycled aggregate content resulted in decreased bearing capacity and elastic stiffness of RE-RACFSTs, and an earlier onset of the confining effect. Furthermore, finite element (FE) models were established and benchmarked against the experimental results. Parametric investigations were then conducted to study the effects of key factors on the residual load-carrying capacity. Finally, according to the experimental and FE results, a simplified formula was proposed to estimate the post-fire residual capacity of RE-RACFST stub columns.
Highlights Post-fire compression tests on RE-RACFST short columns Damage mode, load vs. axial deformation, and strain development Effects of material strengths, cross-sectional dimensions, steel ratios, CRA replacement levels and heating time Simplified formula for estimating the post-fire residual capacity of RE-RACFSTs.
Performance of round-ended recycled aggregate CFST stub columns after fire exposure
Zhao, Hui (Autor:in) / Wang, Zhenhe (Autor:in) / Zhang, Wenhao (Autor:in) / Wang, Rui (Autor:in) / Yang, Dongdong (Autor:in) / Lam, Dennis (Autor:in)
26.10.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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