Being inside a building during an earthquake is, at best, a little unsettling, but it’s extremely difficult to measure the movement of an entire building. Last year, researchers at MIT were able to use slow motion cameras to visualize how much a tower crane moved during normal conditions, which gave insight into the stress a crane undergoes. Measuring the effects of an earthquake is a little trickier, so the US Geological Survey (USGS) had to get a little creative to capture it.
USGS’ National Strong Motion Program is dedicated to recording the effects earthquakes have on our structures. They currently have sensors loaded in more than 660 ground sites and more than 180 buildings, bridges, dams, and other structural arrays. Most sites, for obvious reasons, are located in the Western US. Each building contains anywhere from 3 sensors (Desert Center, CA’s Hinds Pumping Plant) to 72 (Rincon Hill Tower in San Francisco and UCLA’s Factor Building in Los Angeles).
The Frontier Building is the subject of the video below. Built in 1982, the 219 feet (67m) tall building is the home to many State of Alaska offices in Anchorage. On January 24, 2016, the building was rocked by a 7.1 magnitude earthquake. Thanks to the USGS’ 36 sensors located in and around the building, we are able to see exactly how a building sways, twists, and shakes during a catastrophic event like this. To help visualize the event, the motions have been magnified by 300x their actual movement, so it looks a little more dramatic than it actually was. This research does, however, give designers key insight to real world conditions which could prove or disprove their calculations.
Video below was uploaded to Youtube by USGS.
Last November, OSHA issued a final rule that would finally allow them to enforce language, which has been in their standards since 2010, requiring construction crane operators to be formally qualified to operate the equipment. The first day of enforcement for that rule had been set for November 10, 2018, but the agency has recently proposed a new rule that would pull back some of the initial requirements.
Finding enough labor to complete jobs has been a problem for many companies in the construction industry over the past few years. Amid a construction “boom” in many areas, general and subcontractors are accepting jobs without enough people to work them, so some have turned to hiring “subs of subs” to supplement their work, a report published by The Tennessean says.
In March, OSHA announced that they would be enforcing their previously delayed beryllium exposure limit for the construction industry on May 11, 2018. The agency has recently confirmed that enforcement date in a memorandum on May 9, 2018.
OSHA newer and more stringent regulations regarding employee’s exposure to respirable crystalline silica officially went into effect on September 23, 2017. The new reduced the permissible exposure limit of the substance, which is found mostly in products containing sand (like concrete, mortar, and brick), from 250 micrograms per cubic meter of air down to 50 micrograms per cubic meter of air averaged over an 8 hour shift.
For the third time in a year, construction workers have had to be rescued while dangling mid-air by fire rescue teams in Southern Florida. Last year, there were two incidents in Sarasota, Florida that involved failed suspended scaffolding in as many months. Just last week, another incident in Palmetto Bay required the Fire Department to intervene.
The construction industry has never been one to freely share information without charging a fee. That’s changed slightly recently, with some major players willing to provide useful tools and information to help us become better. For instance, we recently shared that Procore has released hundreds of free continuing education courses on their education platform. Another useful site we’ve found recently has shared dozens of toolbox talks to help your team on the jobsite learn about safety.
[guest post] The reality is that construction workers, who already face hundreds of hazards just by working in the industry, are also often at risk for becoming injured or ill due to contact with wildlife.
It should be obvious that formal safety training is extremely important to running a successful safety program on any construction site. The most common route for construction employers to train their staff is through OSHA 10 and OSHA 30 courses, but, in the past, it was pretty confusing to determine who was actually authorized to teach the courses and where to find them.
[guest post] Spring is here and before we know it, summer will follow. In both seasons, weather conditions can present dangers to construction workers. Without education and preparation, workers may find that they are seriously ill or injured during work.
Crane collapses on construction jobsites are usually pretty terrifying, especially when the jobsite is full of workers. A construction site in St. Petersburg, Florida got extremely lucky when a large construction crane collapsed and narrowly missed several running workers.