Abstract
Simple bracing frames can be divided into two types in terms of concentric or eccentric. Concentric bracing frames are frames that intersect with other structural members at one point in the structure along the bracing members. Otherwise, the braced frame will be eccentric. It is said empirically that due to this type of shaping, eccentric bracing frames exhibit more ductile behavior and concentric bracing frames exhibit more stiff behavior. This behavioral difference caused this study to be numerically computing for five frames, including unique concentric and eccentric bracing frames of 5 and 10 stories and an ordinary 5‐story concentric bracing frame. Their tensions and drift ratios should be acceptable for the use of residential buildings. Using the primary two steps of the new PEER probabilistic framework, namely, probabilistic seismic hazard analysis and structural analysis, which leads to the drawing of fragility curves, the probability of collapse is obtained to compare the safety capability of these frames according to their different characteristics against earthquakes. The results show that increasing the ductility or increasing the number of floors or the height of these systems can reduce collapse. Also, according to the results of the probability of collapse obtained in frames with 5‐story concentric bracing frames, it can be said that some of the current regulations, which work based on previous approaches of analysis, can lead to unsafe structures with a high probability of collapse.
Highlights
In the bracing frame, more stability stiffness and uncertainty can be created by connecting the braces to the beams and columns
In order to compare the results of the experiment by Shi et al and the modeling performed according to the frames of this experiment, the ultimate force and displacement endured are collected (Table 8). e results show that the difference between the experimental results and the modeling in both software is less than 10%
One of the most important drawbacks of applying nonlinear dynamic analysis is the sensitivity of the response to selected accelerometers. e presentation of incremental dynamic analysis and estimation of responses based on the application of probabilistic relations have to a large extent be compensated for this weakness in practice. e results of IDA analysis obtained from this method along with 16,50,84% percentiles and the probability density function (PDF) of the data are plotted in Figures 20–22, in addition to the points selected due to the reduction of stiffness to 20% of the elastic stiffness of each curve
Summary
More stability stiffness and uncertainty can be created by connecting the braces to the beams and columns. In the framework of the PEER method, the probability of damage to structures due to earthquakes is estimated In this regard, the Pacific Earthquake Engineering Research Institute is a building risk assessment that is the basis for the generation of seismic design codes. The Pacific Earthquake Engineering Research Institute is a building risk assessment that is the basis for the generation of seismic design codes In this method, the probability of structural failure is determined by the possible combination of hazard and vulnerability functions of structures. Lin et al worked on the effectiveness of braced frames by studying 6 structures with BRB and EBF systems in 6- and 20-story class systems using 20 far and near field records In this study, they concluded that the effectiveness of the added brace depends on the height and type of ground movements. The use of probabilistic analysis methods for the design and analysis of structures has been allowed. e methods used in this research will apply to real projects under design [13]
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