Numerical and theoretical research on flexural behavior of steel-UHPC composite beam with waffle-slab system. (August 2020)

• Record Type: Journal Article
• Authors: Zhu, Jinsong; Guo, Xiaoyu; Kang, Jingfu; Duan, Menghao; Wang, Yongguang
• Is Part Of: Journal of constructional steel research. Volume 171(2020)
• Publication Date: 2020-08
• Subjects: UHPC -- Composite beam -- Waffle slab -- Flexural working mechanism -- Parametric analysis -- Ultimate flexural capacity; Steel, Structural -- Periodicals; Building, Iron and steel -- Periodicals; Acier de construction -- Périodiques; Construction métallique -- Périodiques; 624.1821
• DOI: 10.1016/j.jcsr.2020.106141
• Languages: English
• ISSNs: 0143-974X

Abstract

Abstract: Based on the experimental study on six steel-UHPC composite beams with waffle slab (SUCBWS), a three-dimensional finite element model was proposed to analyze the flexural behavior of SUCBWS. Then the applicability of finite element model was validated against the experimental results. A subsequent parametric study was performed to investigate the effects of yield strength of steel, ratio of rib height to upper panel thickness, transverse reinforcement ratio and layout of ribs on the flexural behavior. Results show that the reduction of thickness of upper panel for waffle slab will significantly weaken its integrity and increase the risk of longitudinal splitting failure by comparing with reducing the number of ribs. The waffle slab with low ribs should be adopted as the bridge deck. The increase of transverse reinforcement ratio has little effect on improving the ultimate flexural capacity, while it is obvious for improving the ultimate deformation capacity. The minimum transverse reinforcement ratio of 0.5% is suggested. The contribution of ribs is small for flexural capacity but is large for ensuring ultimate deformation capacity. Finally, the calculation method of ultimate flexural capacity was proposed. The comparison of theoretical, experimental and numerical results revealed the good accuracy of predictions indicating that the actual behavior of SUCBWS was reasonably reflected by the calculation method. Highlights: Steel-UHPC composite beam with waffle slab (SUCBWS) was studied theoretically. Reduction of thickness of panel significantly weakened integrity of waffle slab. Waffle slab with low ribs should be adopted as bridge deck of SUCBWS. A minimum transverse reinforcement ratio of 0.5% was suggested for SUCBWS. A calculation method of ultimate flexural capacity of SUCBWS was proposed.