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.
Falls from height are the leading cause of fatalities on construction sites by a long shot, as the account for around 40% of deaths. Fall protection training in the classroom can often fall short, because hearing words and learning definitions about fall prevention may not have the same effect as seeing and interacting with fall prevention techniques.
On Monday morning, a 13 story building in Miami Beach that was being prepped for demolition suddenly collapsed, injuring one Project Manager that was struck by debris.
OSHA's new crystalline silica dust exposure regulations officially went into effect on September 23, 2017. Over the past 10 months, there has been plenty of confusion about the lung disease causing material. In the first 6 months after the effective date, OSHA's inspectors yielded 116 violations across the country.
Investigators are on the scene of a catastrophic explosion at a Texas construction project that killed 1 and has injured another 15 workers. The explosion occurred on Tuesday afternoon at Coryell Memorial Healthcare System in Gatesville, Texas, which is being expanded.
[guest post] June is National Safety Month, and this week, the focus is on falls. As anyone who works in construction knows, this industry has some of the highest workplace accident and injury rates in the United States. The Occupational Health and Safety Administration (OSHA) ranks falls as one of their Fatal Four most deadly type of construction accidents.
Construction crews were preparing to replace window glazing on the 47-story tall Wellhouse na Leninskom tower in Moscow, Russia, when a cable snapped just as the window was about to reach the top of the structure
On March 15, 2018, a devastating pedestrian bridge that was under construction collapsed onto an open roadway below, killing 1 bridge worker and five motorists, as well as injuring 8 others. As was expected, investigations have been underway since the accident, which are expected to take at least several more months to complete