This video shows the simulation of the second building from the building library. Two damage scenarios were examined: a pillar removal due to explosion and an earthquake. The pillar removal did not lead to collapse. The video displays the reaction when the strong earthquake time history was applied.
The building library collects a range of typical building structures (9-10 buildings) including structural details. Prone to collapse risks are examined and the collapse shapes are exported from the simulations in a digital exchange format DXF and OBJ. The building library can be used in a real collapse case to estimate the probable location of cavities.
The removal of these two pillars did not lead to collapse.
According to an Indian source: “A single Judge investigation committee and a Special Investigation Team (SIT) were formed by Tamil Nadu government to investigate the cause of the disaster. The major reason for this disaster was due to the carelessness of the builders in Chennai. The chief engineer handling the construction accepted his mistake and was fined by the police.”
Unfortunately the reasoning for the collapse was not given in detail. In this video the building shows a remarkable stiffness towards the end of the collapse. This contradicts the accusations that the building was prone to collapse at any time by its own self weight.
Here is a video and download link for the virtual training tool prototype created using Unreal Engine 4. The building model is from a collapse simulation of the Pyne Gould Corporation building in Christchurch, New Zealand. The simulation was made by Laurea UAS as a part of INACHUS´ software validation cases .
At the current stage of the prototype, the user will try to find and evacuate all victims in the scene. The prototype will hopefully be improved further by another student, so it can be brought to a point where it could be used as a virtual training tool to reduce costs in Urban Search and Rescue training. For example adding first aid, techniques and decision making according to the USaR principles could be implemented in the tool.
The project was done by Ville Tiira as an internship and thesis, which are a part of the Bachelor’s degree in Business Information Technology in Laurea UAS.
We are happy that our Pyne Gould simulation was noticed by the creator of the Bullet Physics library himself. The video is now cross-linked on his personal Google+ profile:
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.
© Polytechnic Südwestfalen, Prof. Dr.- Ing. Jan Meppelink
On 28th of June 2014 around 4:40 PM IST one of two under construction buildings collapsed at a suburb of Chennai, in the Indian state of Tamil Nadu. The collapse happened during heavy rain and a thunderstorm with lightning. The building site was still busy. Workers and casual uninvolved searched shelter from the rain and frequent lightning. This is the reason the accident claimed many victims, altogether 61 casualties. Many of the survivors delivered eye witness reports. According to those reports the building collapsed directly after a lightning stroke. This might be the first documented case where a lighting caused the complete collapse of a building.
The debris pattern is most unusual, since the building was split into two halves and each half shifted to the respective side. The simulation, made by Virtual Validation Corporation Kostack & Walter, reproduces this extraordinary dynamics very well. The software was developed at Laurea University of Applied Sciences.
Now, that we are able to successfully simulate the collapse of big building structures, the software Blender gives its splendid support to exploit the simulation results for interactive walk throughs. Blender´s powerful features facilitate educational tools for rescue workers and paramedics. A training program could teach them in localizing victims within the debris, estimating their physical condition and applying first aid measures.