Category Archives: reports

Report on Model Enhancement and Validation Cases

report-on-model-enhancement-and-validation-cases-extract

Herewith we publish intermediate results of our work on the Bullet Constraints Builder. This report is an extract of a much larger study of comparisons between the three simulation methods: DEM, FEM and AEM. This main study is for the time being restricted and it will only be published at a later stage. We are happy that we got green light to disseminate an extract with text content that was created by Laurea University of Applied Sciences.

In this report our simulation results are compared with well documented real collapse cases: The demolition of a simple beam, a mid-size column-slab assembly, and the destruction of the Pyne Gould Corporation building by an earth quake. The good agreement between simulations and reality is encouraging.

report-on-model-enhancement-and-validation-cases-extract

Destruction of concrete by lightning

The claim that the apartment building in Chennai (see post below) collapsed because of a lighting strike sounds- at first- far fetched, since such never was reported before. However, the Polytechnic Südwestfalen, Germany, made laboratory tests that showed that an enormous explosive power is mobilized, when the charge of a lighting jumps from one reinforcement iron to another (when not properly bound together). A possible lesson for engineers and builders in the industrialized countries as well.

concrete-broken-crossing-iron

© Polytechnic Südwestfalen, Prof. Dr.- Ing. Jan Meppelink

The Yu- experiment

To validate structural performance of reinforced concrete structures many tests on RC assemblages have been carried out under column removal scenarios. They provide valuable information on structural dynamic performance. One such experiments was executed at the Fraunhofer Institute for High-Speed Dynamics by following the specimen design by Jun Yu and Kang Hai Tan: A ca 6 meter long concrete beam supported by a center concrete pillar was loaded with a constant 47kN in form of two huge concrete block weights . The center pillar was then suddenly removed by explosives.

The research papers by the Fraunhofer Institute can be downloaded from here.Yu experiment