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发布于:2020-1-24 03:34:50  访问:77 次 回复:0 篇
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Preventing Soft Story Collapse
1 / 2 of all the homes that became uninhabitable following California`s 1989 Loma Prieta Earthquake were a result of soft story failure. Many of the apartment complexes severely damaged during the Northridge earthquake in 1994 were also caused by soft story structural issues. This includes the collapse of the Northridge Meadows apartments, which resulted in the death of 16 natives.
In the San Francisco area, could believed that the next moderate to large earthquake could lead to more than 150,000 soft story collapses. In Los Angeles, experts say it really is earthquake will result in the collapse of 50 concrete buildings throughout the city.
Soft story buildings have one or even more floors with large openings that would normally require a shear wall for leveling. Types of soft story buildings include apartments built over a parking garage or retail businesses with large windows, as well as multi-level commercial structures with floors that have large spaces, windows and doors. Soft story buildings most planning collapse are those built on street corners or unstable soil. However, any multi-level residential or commercial building with unreinforced ground floor openings is often a potential hazard during a quake, especially buildings constructed between the 1960s and 1980s.
Technically, a building is said "soft story" if a floor is below 70% as strong as the floor above it, or less than 80% as strong as the average strength (stiffness) for the three floors on surface of it. The reason being that the weaker floor one is the most susceptible to lateral motion from the quake. The side-to-side earthquake motion generate enough stress to damage or collapse the floor. A single floor collapse can result in the collapse among the entire building.
With about 20,000 soft story buildings throughout Los Angeles, earthquake retrofitting is often a serious legal matter. A new proposal could result in mandatory retrofitting requirements having a 30-year retrofit deadline. To date, merely takes a simple relatively small number of property owners have taken action boost the structural integrity of their buildings.
The retrofitting process begins with an inspection by reality building contractor who has experience in soft story earthquake retrofitting. Aspects are taken into consideration when developing the retrofitting plan. Types of retrofitting include strengthening existing walls with braces or plywood, anchoring walls towards the foundation and adding shear walls. The goal of the retrofitting is to make the building earthquake ready and safe by raising the structure`s lateral stiffness and strength.
What happens if retrofitting is omitted? In 2008, China`s 8.0 Wenchuan earthquake killed nearly 90,000 people and left almost 5 million people homeless. Many of the deaths in order to attributed to the collapse of unreinforced buildings. Right now, if a major earthquake hits the Bay Area, it is considered that 80% of San Francisco`s soft story buildings would fold.
When it involves strengthening structures and preventing earthquake damage or building collapse, a foundation contractor with extensive retrofitting knowledge is the perfect resource with a foundation inspection. Earthquake preparation should be taken seriously, and the retrofitting process should be started now, before the subsequent quake, to safeguard property and stop injuries during a quake.
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