Development of a toolbox suitable for dynamic response analysis of simplified structures
conference paper
The behaviour of dynamically loaded structures can be analysed with advanced numerical techniques as well as with less laborious engineering methods. Most used simplified method is a mass-spring analysis of a structure as described in the TM 5-1300. The structure is translated to mass and spring properties and the equation of motion is (numerically) solved.
At the TNO Prins Maurits Laboratory a toolbox is under development for analysing dynamically loaded structures. Its goal is the total implementation of all known theory of high dynamic response of panels into a single software program MathCad/MathConnex in such a way that it is easy to expand and easy to use. This software program is used because it is available and especially suitable for a modular structure and because of its capability to connect with other programs like Excel.
In the current version of the Toolbox five different loading functions are implemented. The pressure functions include high explosive loading functions as well as gas pressure functions. The elasto-plastic dynamic behaviour of one-way and two-way panel structures with different boundary conditions can be calculated. Different materials can be used like glass panes, reinforced concrete slabs and corrugated steel and sandwich steel or wooden panels.
Besides the ‘straight forward’ response calculation, the Toolbox can also calculate damage levels. Pressure-impulse diagrams are calculated based on a user specified damage criterion like plasticity, ductility or support rotation. This feature has proven itself to be very useful for estimation of the explosion strength, based on damage and deformed structures. The current Toolbox has been used to analyse window breaking due to high explosives detonations, concrete tunnel response and damage level calculations due to gas explosions, and light weight panel design used for protection in military camps. The paper is focussed on the additional and specific features of this Toolbox. That is the design capabilities and the damage assessment.
At the TNO Prins Maurits Laboratory a toolbox is under development for analysing dynamically loaded structures. Its goal is the total implementation of all known theory of high dynamic response of panels into a single software program MathCad/MathConnex in such a way that it is easy to expand and easy to use. This software program is used because it is available and especially suitable for a modular structure and because of its capability to connect with other programs like Excel.
In the current version of the Toolbox five different loading functions are implemented. The pressure functions include high explosive loading functions as well as gas pressure functions. The elasto-plastic dynamic behaviour of one-way and two-way panel structures with different boundary conditions can be calculated. Different materials can be used like glass panes, reinforced concrete slabs and corrugated steel and sandwich steel or wooden panels.
Besides the ‘straight forward’ response calculation, the Toolbox can also calculate damage levels. Pressure-impulse diagrams are calculated based on a user specified damage criterion like plasticity, ductility or support rotation. This feature has proven itself to be very useful for estimation of the explosion strength, based on damage and deformed structures. The current Toolbox has been used to analyse window breaking due to high explosives detonations, concrete tunnel response and damage level calculations due to gas explosions, and light weight panel design used for protection in military camps. The paper is focussed on the additional and specific features of this Toolbox. That is the design capabilities and the damage assessment.
TNO Identifier
1014767
Publisher
TNO
Source title
30th DoD Explosives Safety Seminar, Atlanta, GA, USA, 13-15 August 2002
Collation
12 p.
Files
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