Abstract
Prediction of existing buildings’ vulnerability by future earthquakes is one of the most essential topics in structural engineering. Modeling steel structures is a giant step in determining the damage caused by the earthquake, as such structures are increasingly being used in constructions. Hence, two same-order steel structures with two types of structural systems were selected (coaxial moment frames and moment frame). In most cases, a specific structure needs to satisfy several functional levels. For this purpose, a method is required to determine the input request to the structures under possible earthquakes. Therefore, the Incremental Dynamic Analysis (IDA) was preferred to the Push-Over non-linear static method for the analysis and design of the considered steel structures, due its accuracy and effect of higher modes at the same time intervals. OpenSees software was used to perform accurate nonlinear analysis of the steel structure. Two parameters (spectral acceleration and maximum ground acceleration) were introduced to the modeled frames to compare the numerical correlations of seismic vulnerability obtained by two statistical methods based on the "log-normal distribution" and "logistics distribution", and finally, the parameters of displacement and drift were assessed after analysis.
Highlights
In order to obtain a proper instruction for decreasing the impact of earthquakes, prediction of potential vulnerability of existing buildings due to future earthquakes is one of the most essential affairs in structural engineering
By reviewing the figures and tables related to vulnerability, it can be concluded that the mean steel moment frame structures showed less vulnerability than steel coaxial braced frame structures
In this way, depending on the type of IM and DM parameters, between 20% to 90% of vulnerability values of steel moment frames were less than coaxial braced frame structures
Summary
In order to obtain a proper instruction for decreasing the impact of earthquakes, prediction of potential vulnerability of existing buildings due to future earthquakes is one of the most essential affairs in structural engineering. The curves, provide unique information about the nature of the structure response for several degrees of freedom This analysis is specified for a variety of purposes, some of which include: Creating a correct understanding of structural behavior under extreme and rare earthquakes, having a better perception of changes in the nature of structure response by increasing the magnitude of earthquake (change of maximum deformation patterns at the height of structure, trend of decrease of strength and resistivity by being sensitive to the model and magnitude), obtaining estimations of the overall system dynamic capacity, studying the trend of constant or variable condition of each of the above cases for each of the records involved in the IDA analysis. This means that before the designing phase, the behavior of the considered structure during the earthquake (objectives of study) were determined qualitatively and since some definitions were converted in quantitative form and applied as useful design information during the numerical phase For this purpose, a method of using the concepts of energy and damage indicators was proposed. Authors suggested to use cross braces to increase lateral hardness
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