Unlike other disasters, the advance technology currently available still fall short in predicting the occurrence and magnitude of earthquakes. In designing buildings subject to earthquakes, it is still advisable to keep a conservative factor of safety. There are three types of analysis used currently:
1. Response History Analysis
This type of analysis considers the response of a building as a function of time. The time span considered is that period when the structure is subjected to a specific ground acceleration.
Using Newton's Second Law of Motion, stating that a body will move in a certain acceleration which is inversely proportional to its mass but directly proportional to the force if motion is present, that is, resultant force acting on it is non zero.
Forces on the body is identified as a function of time
2. Response Spectrum Analysis
RSA is another statistical analysis which is linear-dynamic by nature. It measures the vibration to show the most feasible maximum seismic response of an elastic structure. This uses pseudo-spectral acceleration where velocity and displacement are functions of a specific period in a span of a certain time history and also with level of damping.
RSA is useful when analyzing dynamic performance. Structures experience greater vibrations of ground acceleration with shorter period. On the other hand, with longer period, structures go thought greater displacement.
3. Equivalent Lateral Forces
ELF is a conservative method utilizing static analysis method. However, it requires data from dynamic analysis - mass. Similar with the previous analyses, Newton's Second Law of Motion is still used in deriving the formula specifically:
thank you for posting very informative for help go to the link Structural Analysis India
ReplyDeletethanks for information and content was amazing please do share more blogs
ReplyDelete,Structural Analysis in India