Influence analysis and empirical modeling for torsional cracking and ultimate torsional strength of reinforced concrete beams with axial stress and steel fibers

Hoseong Jeong , Hyunjin Ju , Kang Su Kim

Abstract

Torsional moments occur mainly in spandrel and curved beams, which are structural elements subjected to asymmetric loads. In the past, torsion was not considered in reinforced concrete (RC) design due to a conservative safety factor. However, since the 1960s, the importance of torsional design has been highlighted due to a lower factor of safety and an increase in irregular structures. To date, torsion tests have been conducted on various members, such as RC, steel fiber reinforced concrete (SFRC), and prestressed concrete (PSC). However, there has been a lack of research comparing their effects or deriving empirical models based on the data including them. Therefore, this study analyzed the effect of features and derived empirical models for torsional cracking and ultimate torsional strength based on 514 previous experimental data including RC, SFRC, and PSC. The findings revealed the importance and interaction of features affecting torsional cracking and ultimate torsional strength. Also, simple and highly accurate models for torsional cracking and ultimate torsional strength were derived.

Key Words

axial stress; reinforced concrete; steel fiber; torsion; torsional cracking strength; ultimate torsional strength

Address

Hoseong Jeong — Department of Architectural Engineering, University of Seoul, 163 Seoulsiripdaero, Dongdaemun-gu, Seoul 02504, Republic of Korea
Hyunjin Ju — School of Architectural Convergence, Hankyong National University, 327 Jungang-ro, Anseong-si, Gyeonggi-do 17579, Republic of Korea
Kang Su Kim — Department of Architectural Engineering and Smart City Interdisciplinary Major Program, University of Seoul, 163 Seoulsiripdaero, Dongdaemun-gu, Seoul 02504, Republic of Korea

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