Vulnerability and improvement of reinforced ECC flexural members under displacement reversals: Experimental investigation and computational analysis

Abstract Engineered Cementitious Composite (ECC) is characterized by ductile tensile strain-hardening behavior accompanied by multiple narrow cracks. Its ultimate tensile strain under uniaxial loading is often reported to be more than 3%. This study explores the flexural performance of regular and innovative reinforced ECC members under displacement reversals. Four reinforced cantilever structural beams are prepared and tested under cyclic loading. Among the specimens, two ECC beams are proposed to improve the failure mechanism of regular reinforced ECC beams, which are found to be prone to steel fracture in this study. In one specimen, the flexural rebar is debonded in the potential plastic hinge region. In another specimen, it is flexurally reinforced with Nickel–Titanium shape memory alloy (SMA) rebar with the property of superelasticity. The behaviors of the cantilever beams are evaluated using multiple performance measures, including hysteretic loops, numbers of cracks, beam rotations, and steel strains. In addition to the experimental study, computational models which are capable of simulating the hysteretic behavior of the tested specimens with reasonable accuracy are suggested.

[1]  J. Mander,et al.  Theoretical stress strain model for confined concrete , 1988 .

[2]  Hong Hao,et al.  An experimental and numerical study of reinforced ultra-high performance concrete slabs under blast loads , 2015 .

[3]  James K. Wight,et al.  Seismic Detailing and Behavior of Coupling Beams with High-Peformance Fiber- Reinforced Concrete , 2010 .

[4]  C. Hung,et al.  Hybrid Rotating/Fixed-Crack Model for High-Performance Fiber-Reinforced Cementitious Composites , 2010 .

[5]  Gustavo J. Parra-Montesinos,et al.  Highly Damage-Tolerant Beam-Column Joints Through Use of High-Performance Fiber-Reinforced Cement Composites , 2005 .

[6]  Sherif El-Tawil,et al.  Seismic Behavior of a Coupled Wall System with HPFRC Materials in Critical Regions , 2011 .

[7]  C. Hung,et al.  Modeling the shear hysteretic response for high performance fiber reinforced cementitious composites , 2013 .

[8]  James K. Wight,et al.  Experimental Study on Seismic Behavior of High-Performance Fiber-Reinforced Cement Composite Coupling Beams , 2005 .

[9]  Sarah L. Billington,et al.  Cyclic Response of Precast High-Performance Fiber-Reinforced Concrete Infill Panels , 2011 .

[10]  Carlos Zanuy,et al.  Experimental assessment of connections for precast concrete frames using ultra high performance fibre reinforced concrete , 2013 .

[11]  Victor C. Li,et al.  Tailoring ECC for Special Attributes: A Review , 2012, International Journal of Concrete Structures and Materials.

[12]  Jian Zhao,et al.  Modeling of Strain Penetration Effects in Fiber-Based Analysis of Reinforced Concrete Structures , 2007 .

[13]  Gregor Fischer,et al.  EFFECT OF MATRIX DUCTILITY ON DEFORMATION BEHAVIOR OF STEEL-REINFORCED ECC FLEXURAL MEMBERS UNDER REVERSED CYCLIC LOADING CONDITIONS , 2002 .

[14]  W. Park,et al.  Shear strength of pseudo strain hardening cementitious composite coupling beam , 2011 .

[15]  Jianzhong Lai,et al.  Repeated penetration and different depth explosion of ultra-high performance concrete , 2015 .

[16]  Antoine E. Naaman,et al.  Optimizing Ultra-High Performance Fiber-Reinforced Concrete , 2011 .

[17]  C. Hung,et al.  On modeling coupling beams incorporating strain-hardening cement-based composites , 2013 .

[18]  K. Kesner,et al.  Investigation of infill panels made from engineered cementitious composites for seismic strengthening and retrofit , 2005 .

[19]  R. Park,et al.  Flexural Members with Confined Concrete , 1971 .

[20]  Hossein Nezamabadi-pour,et al.  Applications of the ANFIS and LR in the prediction of strain in tie section of concrete deep beams , 2013 .

[21]  Murat Saatcioglu,et al.  Behavior of ultra-high performance fiber reinforced concrete columns under blast loading , 2015 .

[22]  Robert Tremblay,et al.  Self-Centering Energy Dissipative Bracing System for the Seismic Resistance of Structures: Development and Validation , 2008 .

[23]  Hjh Jos Brouwers,et al.  Static properties and impact resistance of a green Ultra-High Performance Hybrid Fibre Reinforced Concrete (UHPHFRC): Experiments and modeling , 2014 .