scholarly journals A Numerical Model for Tracing Structural Response of Ultra-High Performance Concrete Beams

Modelling ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 448-466
Author(s):  
Roya Solhmirzaei ◽  
Venkatesh Kodur
Keyword(s):  
Numerical Model ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Beams ◽  
Structural Response ◽  
Strain Response ◽  
Ultra High Performance Concrete ◽  
Fiber Volume ◽  
Reinforcing Bar ◽  
Tension And Compression

This paper presents a finite element-based numerical model for tracing the behavior of ultra-high performance concrete (UHPC) beams. The model developed in ABAQUS can account for stress–strain response of UHPC and reinforcing bar in both tension and compression, bond between concrete and reinforcing steel, and strain hardening effects in bars and UHPC and can trace the detailed response of UHPC beams in the entire range of loading. This model is validated by comparing predicted response parameters including load-strain, load-deflection, and crack propagation against experimental data governed from tests on UHPC beams with different reinforcement ratios, fiber volume fractions, and loading configurations (shear and flexural loading). The validated model is applied to quantify the contribution of stirrups and concrete to shear strength of beams so as to explore the feasibility of removing shear reinforcement in UHPC beams.

scholarly journals Influence of Fiber Volume Fraction and Fiber Orientation on the Uniaxial Tensile Behavior of Rebar-Reinforced Ultra-High Performance Concrete

Fibers ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 67 ◽  
Author(s):  
Manish Roy ◽  
Corey Hollmann ◽  
Kay Wille
Keyword(s):  
Fiber Orientation ◽  
High Performance ◽  
Fiber Volume Fraction ◽  
High Performance Concrete ◽  
Volume Fraction ◽  
Tensile Behavior ◽  
Uniaxial Tensile ◽  
Ultra High Performance Concrete ◽  
Load Direction ◽  
Fiber Volume

This paper studied the influence of fiber volume fraction ( V f ), fiber orientation, and type of reinforcement bar (rebar) on the uniaxial tensile behavior of rebar-reinforced strain-hardening ultra-high performance concrete (UHPC). It was observed that the tensile strength increased with the increase in V f . When V f was kept constant at 1%, rebar-reinforced UHPC with fibers aligned with the load direction registered the highest strength and that with fibers oriented perpendicular to the load direction recorded the lowest strength. The strength of the composite with random fibers laid in between. Moreover, the strength, as well as the ductility, increased when the normal strength grade 60 rebars embedded in UHPC were replaced with high strength grade 100 rebars with all other conditions remaining unchanged. In addition, this paper discusses the potential of sudden failure of rebar-reinforced strain hardening UHPC and it is suggested that the composite attains a minimum strain of 1% at the peak stress to enable the members to have sufficient ductility.

Numerical investigation of the shear behavior of reinforced ultra-high-performance concrete beams

2017 ◽  
Vol 19 (1) ◽  
pp. 305-317 ◽  
Author(s):  
Sifatullah Bahij ◽  
Saheed K. Adekunle ◽  
Mohammed Al-Osta ◽  
Shamsad Ahmad ◽  
Salah U. Al-Dulaijan ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Beams ◽  
Shear Behavior ◽  
Ultra High Performance Concrete

scholarly journals Investigate the Structural Response of Ultra High Performance Concrete Column under the High Explosion

2021 ◽  
Vol 71 (2) ◽  
pp. 256-264
Author(s):  
Viet-Chinh Mai ◽  
Xuan-Bach Luu ◽  
Cong-Binh Dao ◽  
Dinh-Viet Le
Keyword(s):  
Cross Section ◽  
High Performance ◽  
High Performance Concrete ◽  
Blast Resistance ◽  
Load Capacity ◽  
Structural Response ◽  
Blast Loading ◽  
Frame Structure ◽  
Ultra High Performance Concrete ◽  
Main Concept

Most of the structures that are damaged by an explosion are not initially designed to resist this kind of load. In the overall structure of any building, columns play an important role to prevent the collapse of frame structure under blast impact. Hence, the main concept in the blast resistance design of the structure is to improve the blast load capacity of the column. In this study, dynamic analysis and numerical model of Ultra High Performance Concrete (UHPC) column under high explosive load, is presented. Based on the Johnson Holmquist 2 damage model and the subroutine in the ABAQUS platform, a total of twenty UHPC model of the column were calculated. The objective of the article is to investigate the structural response of the UHPC column and locate the most vulnerable scenarios to propose necessary recommendations for the UHPC column in the blast loading resistance design. The input parameters, including the effect of various shapes of cross-section, scaled distance, steel reinforcement ratio, and cross-section area, are analyzed to clarify the dynamic behavior of the UHPC column subjected to blast loading. Details of the numerical data, and the discussion on the important obtained results, are also provided in this paper.

Experimental and numerical investigation of steel–ultra-high-performance concrete continuous composite beam behavior

2020 ◽  
Vol 23 (10) ◽  
pp. 2220-2236
Author(s):  
Haolei Wang ◽  
Tao Sun ◽  
Chen Tang ◽  
Jiejun Wang
Keyword(s):  
Numerical Model ◽  
Composite Beam ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Slab ◽  
Plate Thickness ◽  
Bottom Plate ◽  
Ultra High Performance Concrete ◽  
Plate Height ◽  
Bending Capacity

This article proposes a new kind of continuous composite beam that consists of steel box-girder and ultra-high-performance concrete waffle slab. The ultra-high-performance concrete helps increase the ultimate capacity and span of structure while reducing the risk of cracking that occurs with ordinary concrete. In order to investigate the mechanical properties of this new type of composite structure, two scaled specimens were designed and tested. One was a steel–ultra-high-performance concrete continuous composite beam, whereas the other, as a control specimen, was a prestressed steel-concrete continuous composite beam. The test results indicate that the bending capacity of steel–ultra-high-performance concrete continuous composite beam is 1.2 times that of steel-concrete continuous composite beam; the cracking strength of steel–ultra-high-performance concrete continuous composite beam is larger than 20 MPa, much higher than the conventional one; the crack development pattern of steel–ultra-high-performance concrete continuous composite beam has its own characteristics, and the cracks appeared in ultra-high-performance concrete slab dominated by micro-cracks with smaller length are numerous and intensive. A finite element model was developed to predict the behavior of steel–ultra-high-performance concrete continuous composite beam. Comparing the numerical and experimental results indicates that, generally, the numerical model can simulate the structural behavior of steel–ultra-high-performance concrete continuous composite beam reasonably. Based on the numerical model, a series of parameter analyses were performed, which indicate that the strength grade of steel, web, and bottom plate thickness play an important role in improving the bending capacity of steel–ultra-high-performance concrete continuous composite beam; the axial tensile strength of ultra-high-performance concrete, rib, and top plate height of ultra-high-performance concrete slab can enhance the bending capacity to a certain extent.

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