Dynamic compressive strength of concrete damaged by fatigue loading and freeze-thaw cycling

The effects of pre-loading on the dynamic behaviour of concrete were experimentally investigated in a series of split Hopkinson pressure bar tests. Cylindrical specimens with three water/cement ratios and two kinds of aggregates were tested. The effects of pre-loading and strain rates on the dynamic stress–strain relationship, strength, energy absorption capability and failure modes were investigated. The results showed that when the pre-loading was smaller than 30% of the static compressive strength, its effect on dynamic strength could be ignored. However, a 29% reduction in dynamic strength was observed when the pre-loading was higher than 40% of the static strength. In addition, the pre-loaded specimens exhibited greater strain-rate dependence. An empirical model considering the effects of pre-loading and strain rate was developed based on the test data.

An experimental investigation of pre-loading effects on the dynamic behaviour of concrete

The majority of existing studies on the strain rate effect of concrete have concentrated on the dynamic uniaxial strength or a narrow range of strain rates. However, concrete material alway...

Dynamic Multiaxial Strength Criterion for Concrete Based on Strain Rate–Dependent Strength Parameters

The impact resistance of normal-strength carbonate concrete at elevated temperatures up to 800°C was experimentally studied using a split Hopkinson pressure bar (SHPB). The SHPB impact tests focused on the effects of concrete design strengths, high temperature and strain rate on the dynamic behaviour of concrete at elevated temperatures. The stress–time and strain–time curves of the tested specimens were recorded to analyse the impact behaviour of concrete at elevated temperatures. The influences of static compressive strength, high temperature and strain rate on the dynamic peak strength of concrete are discussed. The test results show that the strain rate effect of concrete at elevated temperature is significantly different from that of concrete at room temperature. Within the scope of the SHPB impact tests in this work, the strain rate effects of concrete at 200°C and 300°C are obviously higher than at room temperature. Concrete heated to 400°C was found to recover to around the same level of the dynam...

Dynamic behaviour of normal-strength carbonate aggregate concrete at temperatures up to 800°C

Inelastic orthotropic model for blast analysis of RC slabs

The paper reports the results of biaxial dynamic compressive tests on plain concrete specimens that have undergone a loading history of 0, 30, 50 and 75% of biaxial compressive ultimate strength, carried out on a static–dynamic multiaxial test system, with strain rates ranging from 10−5/s to 10−2/s The effect of load histories on dynamic stress–strain curves, dynamic compressive strengths, initial elastic moduli and critical strains of the concrete are studied Test results demonstrate that the biaxial compressive strength and the biaxial critical strain of concrete decrease with the increasing loading history at the same strain rate, but the biaxial initial tangent modulus of concrete is independent of the load history at the same strain rate Also, the effects of load histories on the biaxial damage threshold stress and strain of concrete in the stress and strain space are studied

Effects of load histories on dynamic biaxial compressive damage behaviours of concrete

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Effects of load histories on dynamic biaxial compressive damage behaviours of concrete