Analytical study of seismic durability and its destructive effects on structures and distribution of accelerated seismic durability of Iran

Background and objective: Experience with past earthquakes and numerical analysis confirms that the durability of strong earth motion, significantly can affect the amount of failure of civil engineering systems. However, if the durability is related to a parameter which describes the intensity of the earth's motion, such as maximum velocity or maximum acceleration or spectral acceleration, then it may help to better prediction of damages for engineering purposes. Method: In this study, different types of seismic durations were first defined. Then the effects of earthquake durability on structural damages were studied and the damages caused by significant durability earthquakes on reinforced concrete structures were investigated. In order to study the durability of earthquakes in Iran, accelerometer records were first extracted with moment magnitudes greater than or equal to 5 and the other characteristics such as distance from fault, mean shear wave velocity to 30m depth, and fault mechanism inserted in catalog. Findings: In this study, two interval and uniform durations were calculated at 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3 degrees of gravity acceleration; and then Iran’s variance diagram data drew by using calculated duration and the durability was discussed at different acceleration thresholds. Studies indicate the sensitivity and vulnerability of concrete structures, and especially the flexural frame system in high-impact earthquakes, while the design is not addressed so sufficient; consideration is required in design regulations. Conclusion: Durability relation can be based on valid external or internal connections. This means that during analyzing earthquake risk, considering the characteristics of seismic sources around the site, not only the acceleration but also the earthquake durability potential can be estimated either, and it is useful in structural calculations especially bent concrete structures to reduce damages.