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Analysis of Factors Affecting the Mechanical Performance of Steel Reinforced Ultra-High Performance Concrete Beams Considering the Bond-Slip Effect
SHEN Dejian, BAI Songlin, JIANG Guoqing, LIU Ci, LI Ming
PDF(3353 KB)
PDF(3353 KB)
Analysis of Factors Affecting the Mechanical Performance of Steel Reinforced Ultra-High Performance Concrete Beams Considering the Bond-Slip Effect
The application of ultra-high performance concrete （UHPC） to steel reinforced concrete structures can improve the load carrying capacity， reduce the cross-section size， and solve the problems of complex construction caused by the intensive configuration of stirrups and shear members. The current finite element simulation study of steel reinforced UHPC beams is mainly a parametric qualitative study of bending capacity， ignoring the bond-slip effect between steel and UHPC， which lacks the assessment of its interfacial bond performance and combination effect， as well as the in-depth discussion of the stress performance of the UHPC in tensile zone. In this paper， the finite element simulation analysis of the bending performance of steel reinforced UHPC beams was carried out based on ABAQUS， and the strength of UHPC， the strength of steel， the longitudinal reinforcement ratio and the steel ratio were parametrically investigated. The load-mid-span deflection curves， cross-section strain distribution， interface bond stress distribution， and tensile zone performance of the UHPC were analyzed. The main conclusions are as follows： （1） The loading process of the composite beam can be divided into four stages： the fully elastic stage， the damaged working stage， the plastic hardening stage， and the ductility development stage. （2） The UHPC in the tensile zone can still participate in the section bending resistance at the peak load， and suggestions for the value of the equivalent stress reduction factor for the tensile zone of UHPC are proposed based on parametric research. （3） The bond stress of the upper flange is mainly concentrated at the loading area， while the distribution of the bond stress on the lower flange is controlled by the development of cracks. The bond performance between the steel section and UHPC at the interface should be improved in the design by means of shear connectors or surface treatment of the steel profiles. （4） During the design process of composite beams， the strength and configuration rate of the steel profiles should be limited to ensure that the composite beams have good ductility and the UHPC in tensile zone exhibits good load-bearing performance.
steel reinforced concrete structure / ultra-high performance concrete / bond-slip / finite element analysis / equivalent stress reduction factor
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