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Facade Tectonics - Façade Design

PEC Sr. Principal, Kirk Marchand, P.E. will be making a presentation at the Façade Tectonics World Congress October 10-11, 2016 in Los Angeles.  His discussion, Glazing Hazard Design: Collaborative Design for High Fidelity Façade Analysis will highlight the Window Hazard Analysis Module (WhAM) design tool.   This adaptable and robust design tool, developed in conjunction with Enclos, utilizes a unique finite element analysis framework (LS-DYNA) and custom material models to evaluate non-rectangular, out-of-plane configurations for wind, blast, seismic and impact loads.  Kirk hopes you can join him as he explore the possibilities this novel tool offers for designing facades against both natural and man-made hazards.

The abstract of his talk is below.

ABSTRACT

The Window Hazard Analysis Module (WhAM) fully integrates a statistical glass fracture modeling approach into a finite element formulation for glass, laminated glass and structural and nonstructural elements Facade Tectonics(mullions, muntins and connections). The unique finite element analysis framework (LS-DYNA) and custom material models offer the flexibility to evaluate non-rectangular and out-of-plane configurations for wind, blast, seismic and impact loads. The software makes full FEA implementation available to façade engineers and researchers without requiring the infrastructure, licensing requirements and modeling expertise typical of high fidelity analysis.

Key computational features include a coupled nonlinear dynamic analysis model that is computationally expedient while maintaining designer-level fidelity, structural and architectural elements (mullions, etc.) represented with efficient equivalent beam elements, glass lites, PVB, and IGU spacers represented with shell elements, and IGU air gaps and silicone beads represented with solid elements. Advanced user-defined constitutive models (UMATs) have all been vectorized and implemented in SMP and MPP parallel processing structures within a computational model programmatically incorporating the multi-physics finite element code LS-DYNA.

Key numerical formulations include a new Glass Failure Prediction Model (GFPM) based LS-DYNA UMAT with an elastic constitutive model with flaw-based probabilistic failure criterion, a new PVB interlayer LS-DYNA UMAT that includes a post-break, strain-based stiffness increase due to interaction between PVB and adhered glass shards and a new structural silicone LS-DYNA UMAT that includes a hyper-elastic constitutive model.

Shock tube tests have been conducted to for validation. Tests included a 4-lite storefront exposed to 5 levels of blast load.  DIC (digital image correlation) was used for surface displacement measurement.  Improved FEA model comparisons with tests showed excellent correlation of predicted and measured results.

For more information on PEC’s glass modeling capabilities or Window (hazard) Analysis Module (WhAM) contact Kirk Marchand, PE or Eric Sammarco, PhD, PE.

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