Civil buildings are not specifically designed to support blast loads, but it is important to take into account these potential scenarios because of their catastrophic effects, on persons and structures. A practical way to consider explosions on reinforced concrete structures is necessary. With this objective we propose a methodology to evaluate blast loads on large concrete buildings, using LS-DYNA code for calculation, with Lagrangian finite elements and explicit time integration. The methodology has three steps. First, individual structural elements of the building like columns and slabs are studied, using continuum 3D elements models subjected to blast loads. In these models reinforced concrete is represented with high precision, using advanced material models such as CSCM_CONCRETE model, and segregated rebars constrained within the continuum mesh. Regrettably this approach cannot be used for large structures because of its excessive computational cost. Second, models based on structural elements are developed, using shells and beam elements. In these models concrete is represented using CONCRETE_EC2 model and segregated rebars with offset formulation, being calibrated with continuum elements models from step one to obtain the same structural response: displacement, velocity, acceleration, damage and erosion. Third, models basedon structural elements are used to develop large models of complete buildings. They are used to study the global response of buildings subjected to blast loads and progressive collapse. This article carries out different techniques needed to calibrate properly the models based on structural elements, using shells and beam elements, in order to provide results of sufficient accuracy that can be used with moderate computational cost.
[1]
J. M. Goicolea,et al.
Análisis termomecánico no lineal mediante métodos explícitos de diferencias finitas y elementos finitos
,
1992
.
[2]
John E. Crawford,et al.
Retrofit Methods to Mitigate Progressive Collapse
,
2002
.
[3]
Glenn Randers-Pehrson,et al.
Airblast Loading Model for DYNA2D and DYNA3D.
,
1997
.
[4]
Yvonne D Murray,et al.
Users Manual for LS-DYNA Concrete Material Model 159
,
2007
.
[5]
Bibiana Luccioni,et al.
Analysis of building collapse under blast loads
,
2004
.
[6]
Todd P Slavik,et al.
A coupling of empirical explosive blast loads to ALE air domains in LS-DYNA®
,
2010
.
[7]
Paul F. Mlakar,et al.
The Oklahoma City Bombing: Analysis of Blast Damage to the Murrah Building
,
1998
.
[8]
Daniel R. Ambrosini,et al.
Colapso estructural bajo cargas explosivas
,
2008
.
[9]
José María Goicolea Ruigómez,et al.
Impact And Explosive Loads On Concrete Buildings Using Shell And Beam Type Elements
,
2011
.