Theoretical and experimental study on steel open-web sandwich floor with flanged cruciform section shear key

• Published in: Latin American Journal of Solids and Structures Vol. 17; no. 3
• Main Authors: Shen, Ruilin, Xiao, Jianchun, Ma, Kejian, Mao, Jiayi, Li, Guiping, Zeng, Weiyi, Wang, Qin
• Format: Journal Article
• Language: English; Portuguese
• Published: Latin American Journal of Solids and Structures 01.01.2020; Associação Brasileira de Ciências Mecânicas
• Subjects: ENGINEERING, CIVIL; ENGINEERING, MECHANICAL; MECHANICS; China; Flanged cruciform section shear key; intersection beam analogy method; finite element analysis; static test; steel open-web sandwich floor
• ISSN: 1679-7817; 1679-7825; 1679-7825
• DOI: 10.1590/1679-78255897

Steel open-web sandwich floors (SOSFs) have been applied in several pioneering industrial and public buildings. The traditional square tube shear key (STSK) is changed into a flanged cruciform section shear key (FCSK) to further improve the bearing capacity of SOSFs. A half-scale test model is designed. A graded static loading test is performed to measure deflection and strain. The calculation formula of the intersection beam analogy method (IBAM) considering the influence of shear stiffness is proposed. A finite element (FE) analysis was also performed. The results of the test, IBAM and FE method are compared. The maximum deviation of the deflection obtained by them is less than 5%, and the maximum strain error is less than 7%. These figures prove that all three methods have high precision in the elastic range. Compared SOSFs use a different shear keys with the same grid size and chords, the maximum Mises stress is reduced by 55.9% and the maximum displacement is reduced by 36.1%. The new shear key imparts the structure with improved bearing capacity and safety margin.