Thus the same earthquake can cause different impact onto different structures. What is unique about structural engineering or I should say building analysis and design, is that every structure is present on a different longitude and latitude, which means is that all the buildings are located at different distance from the earthquake fault, soil conditions, soil surrounding the building site, topography of the region and overall geology. Before that let us talk about this spectrum, a response spectrum is more often created by plotting the spectral accelerations against the time period. This period or frequency of the structure itself can tell us a lot about the building nature. But when I said for different buildings, then what kind of property are we looking for in a building that can clearly define the dynamic nature of the building? Well, if you have looked carefully into dynamics and Newton's equations of motions, a very basic term called the period of the structure and stiffness of the structure pops up very frequently. Now you may wonder what kind of response are we looking for? Well, it can be anything, a displacement spectrum, a velocity spectrum or an acceleration spectrum. Similarly the word Response Spectrum defines the broad range of response of different buildings under a seismic loading. That band of color is known as spectrum if you recall. Now what actually is a spectrum? Let us go back to 6th or 7th grade when we were studying about rainbows and prim, how light is made of different colors. In this post, I will be talking about spectrum and what to do with this spectrum.
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In that part we discussed about what is response of a system under free vibrations and forced vibrations. Now, if you have not read the previous part of response spectrum analysis, I would strongly recommend you to read it.
In the blog post about Response Spectrum Analysis I, I tried to describe response of the system, but one comment on the post rightly pointed out as the concept of spectrum was not described clearly, so in this post we will be talking about the concept spectrum and how it is generated, what it signifies and how is it helpful for engineers to understand the dynamic forces acting on the building.