Effect of HPFRCC on Seismic Performance of Beam-Column-Slab Subassembly
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0097-z
Structural Engineering
Effect of HPFRCC on Seismic Performance of Beam-Column-Slab Subassembly Ting-Ting Lu
a
and Xing-Wen Liangb
a
Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University, Xi’an 710123, China School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
b
ARTICLE HISTORY
ABSTRACT
Received 16 January 2020 Revised 16 June 2020 Accepted 12 July 2020 Published Online 24 September 2020
High performance fiber reinforced cementitious composites (HPFRCC) material exhibits strain-hardening and multiple cracking behaviors. Using HPFRCC in the reinforced concrete (RC) frame is considered to improve the seismic performance and damage mechanism of structure. Three beam-column-slab subassemblies were tested under cyclic loading, and eight frame models were simulation by ABAQUS. In this paper, the effect of substitution of concrete with HPFRCC on the seismic performance and damage mechanism of subassemblies was investigated. According to the test results, the lateral bearing capacity and deformability of beam-column-slab subassemblies increased by above 10% through using the HPFRCC material in the expected damage positions. The shear resistance of the joint zone with HPFRCC material increased by 1.6%, the shear deformation of the joint zone decreased by 7.9%. And the contribution of slab bars to the beam flexural bearing strength also decreased for that the yielding range and the strain amplitude of slab bars are limited through using HPFRCC material. Consequently, the subassemblies were prone to the “strong column - weak beam” damage mechanism to using HPFRCC material in the expected damage positions.
KEYWORDS HPFRCC Frame structure Damage mechanism Flange width Seismic performance
1. Introduction The deformation mode of reinforced concrete (RC) frame is uncertain under different earthquakes due to the smaller lateral stiffness. The weak story failures occur frequently. The damage control for the RC frame is difficult. Thus, the damage mechanism control of the RC frame is a difficult problem in the seismic design of the frame structure. High performance fiber reinforced cementitious composites (HPFRCC) is a new type of cement-based materials with tension strain-hardening, multi-cracking. The seismic performances of the constructions could be enhanced by using the HPFRCC in the expected damage positions (Shin et al., 2013; Shin et al., 2014). And HPFRCC material has been widely used in the civil engineering field (Li et al., 1998; Li, 2008). The name of this material in each research team was different. For simply, all name of this material is described with HPFRCC. Many studies were conducted on the feasibility of using HPFRCC as a means to enhance the performance of beam-column connections. The substitution of concrete with HPFRCC in the joint zone can significantly improve the joint shear resistance, energy CORRESPONDENCE Ting-Ting Lu
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