The Effect of Story Mass Distribution Along the Height of Multi-Story Buildings With Steel Mrfs on the Seismic Input Energy


Abstract eng:
One of the effective factors on the amount of input energy of a multi-story building is the mass distribution along the height of building. In the present paper this issue has been discussed with regard to steel building with moment resisting frames. For this purpose three states of mass distributions, including uniform, ascending and descending along the building’s height, were considered in regular buildings, having symmetrical plans and elevations. Three sets of buildings, including 6-, 9-, and 12-story ones were considered. The amount of total mass was assumed to be the same in all buildings of each set, implying the same total available architectural space in each set. In ascending and descending state the changes were applied by adding or removing one bay at either direction and at each side every two, three, and four stories, respectively in 6-, 9-, and 12-story buildings, so that in all cases the symmetry of the building was kept. The considered buildings in each state were designed first based on a conventional seismic design code (AISC LRFD method), and it was tried that the required sections of structural elements are selected in such a way that the amount of over-strength remains minimal. Then, three series of accelerograms corresponding to low-, mid-, and high-frequency were selected for time history analysis (THA). In each series the records were scaled according to the Iranian code for seismic resistant design of buildings (Standard No 2800 v4). Linear THA were performed for all buildings using the selected records, and the input energy was obtained in each case. Results show that uniform mass distribution along the building’s height does not necessarily results in the minimal input energy, and for various frequency contents of earthquakes, different mass distribution should be investigated to achieve the minimal input energy.

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Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 1025.:
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