Numerical modelling and evaluation of laboratory tests with impact loaded young concrete prisms
(English)Manuscript (preprint) (Other academic)
Numerical modelling in combination with in situ measurements, observations and laboratory testing will be important to future establishment of reliable guidelines for efficient civil and engineering work involving concrete casting close to e.g. blasting operations. Results from laboratory tests with impact loaded young concrete prisms are here evaluated using a 3D finite element model. Solid elements are used and a non-linear material model implemented, capable of describing cracking during stress wave propagation. The position of cracks and measured particle vibration velocities are calculated and compared with laboratory test results. The damaging effect of impact vibrations is evaluated using crack width and fracture energy as damage criteria. Alternative geometry for the test prisms, with a notched section, is analysed. This will give one wide crack at the centre of the prism instead of two or three cracks distributed over its length which will make future laboratory test more efficient and reliable. Recommended damage limits at concrete ages of 4, 6, 8 and 12 h are given, based on numerical calculations for concrete strength class C25 and C50.
Impact-type vibration, Young concrete, Finite element method, Fracture mechanics model, Crack width
IdentifiersURN: urn:nbn:se:kth:diva-168227OAI: oai:DiVA.org:kth-168227DiVA: diva2:815030
QS 20152015-05-292015-05-292015-07-01Bibliographically approved