Скачать с ютуб How to Seismic Retrofit a House - Shear Wall Overturning Forces в хорошем качестве

How to Seismic Retrofit a House - Shear Wall Overturning Forces

Soft Story Seismic Retrofit Contractor serving the San Francisco Bay Area, Alameda, Contra Costa, San Mateo, Richmond, Berkeley, Hayward, San Leandro, Alameda, Castro Valley, San Jose, and San Mateo. Catastrophic damage to soft story homes and apartment buildings is usually caused by garage parking underneath the building. Soft story homes and apartment buildings can be found in all Bay Area cities, but they are especially common in San Francisco. These soft story buildings are identical to the types of buildings that were destroyed in the Northridge Earthquake in 1994    • Earthquake Retrofit      • Видео   The reason soft story buildings suffer collapse is because of a structural phenomenon known as overturning. Overturning simply means the walls on either side of the garage door tip over. An in dept article on overturning can be seen here: Ihttp://bayarearetrofit.com/PDFs/Overt... Soft story building retrofits usually involve the installation of moment frames or moment columns. These rely on stiff steel beams or frames, known as moment columns or frames, which absorb all the earthquake force. In these retrofits when the floor sways back and forth it pushes against, as well as pulls upon, the moment column or beam. Soft story retrofits do not always need to be expensive, though if they need a moment frame or moment column these retrofits can be very expensive. Sometimes the earthquake engineering principle of rotation found can be used. This principle is found in the building code as is applied when retrofit shear walls are built on the sides of the garage and on the back of the garage. Simple engineering calculations, using the base shear formula, are used to determine how long these shear walls should be. http://bayarearetrofit.com/PDFs/7%20B... only difference being that the earthquake retrofit components that would normally go where there garage door opening is, go onto the back of the garage. This is a much cheaper option, but if it won't work it will be necessary to install a much more expensive steel moment frame or moment column.