Blast Resistant Anchor Design Software
Blast-Resistant Window Anchor Design Software (BRADS) is a Windows®-based tool for the analysis and design of anchoring systems used in blast-resistant window glazing. The software is intended to aid engineers, architects, and manufacturers to enhance the resilience of critical infrastructure against terrorist bomb attacks and industrial explosions.
The algorithm underlying the software was developed to satisfy the requirements of CSA S852 , the new Canadian standard for Blast Resistant Window Anchor Systems. The tool can compute the required configuration of window retention anchors based on the major parameters known to influence anchorage capacity, including: substrate flexibility, glazing response, window aspect ratio, frame rigidity, the distribution of dynamic reactions, combined stresses, and anchor boundary conditions.
The software conducts TDOF analysis and computes maximum displacements for the substrate and the window. If the analysis predicts that the window achieves a stable equilibrium, indicating window failure has not occurred, the software calculates window edge support reactions distributed around the window perimeter. The automated analysis procedure will evaluate dynamic reactions generated during the pre-break and post-break phases, and consider the possibility of load reversal, when determining design anchorage forces during inbound and rebound response.
If the required anchor capacity is higher than the applied design forces, then a green anchor symbol is displayed on the anchorage design plot at the specific location for which the design calculations are done. Otherwise a red anchor symbol is displayed. By clicking on individual anchors, the user can display design forces and capacities
The output consists of a printed design report that can be exported as an electronic file outlining the design data, analysis results in terms of substrate and window displacements, anchor shear, axial tension and bending moment values, as well as anchor capacities. The output is also available in a graphical format, displaying displacement time histories, resistance functions and the distribution of anchor forces with applied loads and capacities.
The number of anchors, diameter, strength, and geometry relative to the frame are input parameters. The software checks the capacity of each anchor and indicates whether it meets the requirement of capacity exceeding the applied load. The capacity check is done under combined stresses. A colour-coded graphical output consisting of the window and anchors is presented, with a green anchor indicating sufficient capacity, and red indicating a need for either increasing anchor size, reducing anchor spacing, or selecting an anchor with greater material capacity. This enables the designer to have full control over the design process.