Dynamic Strength Of Concrete Under
Multiaxial Compressive Loading
Author(s)
Y. P. Song & H. L. Wang
Abstract
The dynamic characteristics of concrete are important for structures subjected to
earthquake actions. Now there is much experimental data about this, and most
are uniaxial test data. In large concrete structures, such as concrete dams,
concrete reactive power, the stress states usually are in multiaxial states;
therefore the main objective of this paper is to study the multiaxial compressive
characteristics of concrete subjected to high strain rates under multiaxial
compressive loading. Cubic specimens (100mm by side) are subjected to quasistatic
and dynamic proportional biaxial and triaxial compression tests. The strain
rates used are 10-5/s , 10-4/s, 10-3/s, 10-2/s. The stress ratios are for the biaxial
compression 1:0.1, 1:0.25, 1:0.5, 1:0.75,1:1; for the triaxial compression the
applied constant confining pressures are 4MPa, 8MPa, 12MPA, 16MPa. The
tests are carried out on a concrete triaxial dynamic test system designed by the
authors. The strength characteristics of the specimens at different strain rates and
stress ratios are given. The experiment results indicate that the dynamic strength
of concrete under multiaxial compressive stress states is higher than that under
the uniaxial compressive stress state. Based on the test data, the failure criterion
is established on the octahedral stress space. Its characteristic is that the effect of
the similar angle on the dynamic strength is considered to reflect the changes of
the dynamic strength between the tensile and compressive meridians.
Keywords: dynamic strength, strain rate, biaxial stress state, triaxial stress state.
Keywords
dynamic strength, strain rate, biaxial stress state, triaxial stress state
Related Book
Other papers in this volume
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