Researchers Look to See How Elevated Housing in Florida Stood Up to Hurricane Michael
It's commonplace in
Today, a researcher from the
"Hurricane Michael made landfall on
Sutley said elevated residential buildings are governed by a patchwork of building codes, including ASCE 7, the
"For elevated wood structures, in ASCE 7 there's nothing to account for the fact that they're elevated rather than having four walls on ground, with air flowing underneath that could change pressures on walls and roofs," she said. "So, we were specifically looking at wind pressure on the exposed underside of floors and anything that could influence pressure on wall surfaces. We also wanted to see if there are fatigue failures of components on the mobile homes. Many mobile homes are designed to 1980s wind loads, so there has been 40 years of updates lacking to design standards. We wanted to see how they're performing and make some qualitative and quantitative assessments. We think some components may first fail in fatigue leading to catastrophic failure of the system."
Based on ongoing experimental work, Sutley and her team identified wind damage could be greater to permanently fixed housing elevated between 3 and 7 feet compared with housing elevated less than 3 and greater than 7 feet. To perform an assessment, only a few days after the wind stopped blowing, the KU researcher and her team arrived in the
According to Sutley, undertaking research in a disaster zone where so many people recently had lost their homes wasn't easy.
"This was not the first disaster site I'd been to, but it was important to spend some time reflecting on what we were seeing," she said. "It was my student's first time seeing something like this, and he had to pause a few times to take it all in. We were around some people who had just come back home to see what had happened, and it was hard for them to form complete sentences. They were distraught seeing what was going on -- sometimes they would start crying. We weren't interviewing them, we were appropriately asking if we could look at their property -- but it was our duty to listen to them if they had something they wanted to share, even though we weren't using that as data for our research."
Sutley and her colleagues surveyed damaged housing, making photographs and recording data on their smartphones. The team wanted to record damage to structural and nonstructural components, which often begins with gutter systems, roof-and-wall-sheathing nailing and skirting, which could fatigue and fail under hurricane loads, then cascade into catastrophic failure through vulnerabilities created in the wall and roof systems by these fatigue failures.
"We took pictures of every building site we could access, zoomed out so you could see the whole side," she said. After checking for safety, she said, "Then we wanted to look underneath where the foundation is exposed to get very close-up pictures of what was going on under the structures. We wanted to see if anchors or concrete-and-pile settings were damaged, and look at roof-to-wall connections, porch attachments, carport attachments and building-envelope components that might be subject to loading -- and we took pictures of any damage. We also used a smartphone app, ESRI's ArcGIS-based Survey123 app. I designed a survey to capture specific information, and the app pulled the geocoordinates, and the date and time."
This field data will be used to validate experimental and analytical research Sutley and her team are performing to advance the state of knowledge on structural behavior, wind pressures, and component behavior and failure modes for elevated site-built and manufactured housing. The collected data will be analyzed and categorized for damage levels, then mapped with wind-speed and surge height to grasp effects of wind speed and direction on damage for the types and elevations of buildings considered. Further, images and survey data will be stored on DesignSafe-CI, then made available to the broader research and engineering community.
Sutley hoped the research could help inform standards, especially in vulnerable areas.
"It would be great for building codes and local decision-makers who determine them," she said. "In
Lastly, Sutley suggested residents of mobile homes would do well to safeguard their properties with a few safety measures that are believed to make a difference in high winds.
"One of the things they can do is check the anchorage," she said. "How are the homes fixed to the ground? North and
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