Abstract
In this study, tensile splitting tests and corresponding numerical simulations are performed on high strength concrete, low strength concrete, the interface between the two types of concrete, and the interface reinforced by steel fiber, respectively. The tensile splitting strength, crack initiation load, and damage characteristics are analyzed based on experiment data and fracture surface of samples. It can be concluded that tensile splitting strength and crack initiation load have the descending order of ‘HT’ (high strength concrete sample) > ‘LT’ (low strength concrete sample) > ‘FT’ (interface reinforced by steel fiber) > ‘OT’ (interface). The tensile splitting strength is related not only to the roughness of the fracture surface, but also to the percentage of fractured aggregates. The steel fiber can increase initiation cracking load, peak load and residual strength of the interface. The existing of interface composited by two types of material can cause asymmetric distribution of the stress state, even if geometry and the load are symmetrical for samples.
Highlights
The tensile strength and tensile damage characteristics of concrete/steel fiber reinforced concrete have been studied for decades due to their great importance in structural design and safety analysis.Splitting tensile test methods such as ASTM C-496 [1], ISO 4108 [2], BS 1881-117 [3], etc., are frequently adopted to measure the tensile strength and investigate the corresponding fracture characteristics of concrete materials [4,5]
A systematic investigation is carried out in this study for quantitative analysis strength reduction of the interface and the reinforcement behavior of the steel fiber on the interface through a series of tensile splitting tests on four types of cubic concrete samples, including high strength concrete, low strength concrete, cementation of low and high strength concretes and cementation of low and high strength concretes with steel fibers
The numerical simulation results show that the peak vertical loads of samples have the tendency of ‘HT’ > ‘low but strength (LT)’ > ‘FT’ > ‘OT’
Summary
The tensile strength and tensile damage characteristics of concrete/steel fiber reinforced concrete have been studied for decades due to their great importance in structural design and safety analysis.Splitting tensile test methods such as ASTM C-496 [1], ISO 4108 [2], BS 1881-117 [3], etc., are frequently adopted to measure the tensile strength and investigate the corresponding fracture characteristics of concrete materials [4,5]. The tensile strength and tensile damage characteristics of concrete/steel fiber reinforced concrete have been studied for decades due to their great importance in structural design and safety analysis. Have investigated the crack propagation process in the splitting plane and obtained the distribution of residual tensile strength as crack propagation, and Olesen et al [13] have analyzed splitting tensile fracture and the compressive crushing/sliding failure during the test, In addition to experiments, numerical methods are one of the most important methods for studying concrete structures, e.g., Giuseppe Fortunato et al [14] and Luciano Ombres et al [15] used a nonlinear constitutive relation (concrete damage plastic model) in a numerical model to study the mechanical and damage behavior of concrete structures under load. For steel fiber reinforced concrete, Prisco et al [16] have
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