Siesmic Response Analysis of Typical Iraqi Buildings Using Ritz Vectors

摘要

Most of the buildings in Iraq were designed using outdated building codes that did not account for seismic loads. Since, earthquakes are increasing in the area, it is necessary to account for such necessary additional loading in the designs of buildings. It is not clear if typical RC buildings can undergo the effect of real earthquakes taking place in Iraq now. Three buildings with different details and boundary conditions were modeled using 3D finite elements using SAP2000 Software in order to represent scaled versions of typical multistory reinforced concrete commercial buildings generally constructed in Iraq. The main purpose is to extract the response of these buildings to find out to what extent they can sustain earthquakes. Halabja earthquake happened in November 2017 with a magnitude as recorded from Baghdad observatory, of PGA = 1.1 m/sec ~( 2 ) Mw = 4.9 is used in this research as the seismic load to examine the response of the buildings. It was concluded that these buildings can sustain actual earthquakes taking place in Iraq safely but increasing the magnitude up to 200%, PGA = 2.2 m/sec ~( 2 ) Mw = 6.0, leads to complete failure of such buildings. The use of load-dependent ritz vectors gave more accurate results than the use of Eigen vectors. It was shown that LDR vectors were faster in the solution than Eigen vectors.