This video explains the basic concepts and theory of the Hurricane Wind Module of the BCA Tool.
The Hurricane Wind module analyzes the building performance of the structure being mitigated, specifically, its performance against a strong wind hazard associated with a hurricane.
Once the roof is blown off or damaged, or windows are shattered, wind can enter the structure. With the building envelope compromised, hurricane-force winds entering the structure will cause additional physical damage to the building and its contents.
To prevent these types of damages, the basic goal of hurricane wind mitigation projects is to harden the structure so that it performs better against strong winds. Hardening can be accomplished with project types such as installing hurricane straps that will better keep the roof attached to the structure, or hurricane shutters that will help prevent wind-borne debris from being blown through windows and doors.
To calculate project benefits, the hurricane wind module requires the following key data inputs. First is the windspeed data for the structure’s location. The windspeed velocity and frequency is critical to determining the calculated damages.
Next, you need to enter data about the structure that allows the tool to calculate an economic damage value, for example the:
- Structure size in square feet,
- Replacement cost per square foot, and
- Whether the structure is residential or non-residential.
You will also need to provide more specific information about the building’s properties that the tool uses to determine building performance. These include:
- The type of construction, which could be masonry, wood, steel, or concrete;
- The roof cover type, which could be a gable or hip roof for residential buildings, or built-up roof or single-ply membrane roof for non-residential buildings; and
- Whether the building has shutters.
The value of contents and displacement costs are also calculated as project benefits because the mitigation project will reduce or eliminate these losses. Finally, loss of function benefits can also be calculated as a project benefit for non-residential buildings.
With these BCA inputs known, it is possible for the tool to calculate the impact of the project on the structure’s wind risk. The dollar value of the reduced wind risk are the project benefits.
This concludes the explanation of the basic concepts and theory of the Hurricane Wind Module of the BCA Tool.