The effect of different intensity measures and earthquake directions on the seismic assessment of skewed highway bridges     

M. Bayat  F. Daneshjoo  N. Nisticò 《地震工程与工程振动(英文版)》2017,16(1):165-179

In this study the probable seismic behavior of skewed bridges with continuous decks under earthquake excitations from different directions is investigated.A 45° skewed bridge is studied.A suite of 20 records is used to perform an Incremental Dynamic Analysis(IDA) for fragility curves.Four different earthquake directions have been considered:-45°, 0°, 22.5°, 45°.A sensitivity analysis on different spectral intensity measures is presented; efficiency and practicality of different intensity measures have been studied.The fragility curves obtained indicate that the critical direction for skewed bridges is the skew direction as well as the longitudinal direction.The study shows the importance of finding the most critical earthquake in understanding and predicting the behavior of skewed bridges.  相似文献   

Artificial Neural Network and Firefly Algorithm for Estimation and Minimization of Ground Vibration Induced by Blasting in a Mine     

Bayat  Parichehr  Monjezi  Masoud  Rezakhah  Mojtaba  Armaghani  Danial Jahed 《Natural Resources Research》2020,29(6):4121-4132

Natural Resources Research - It is of a high importance to introduce intelligent systems for estimation and optimization of blasting-induced ground vibration because it is one the most unwanted...  相似文献   

Effect of empty bed residence time on biotrickling filter performance: case study—triethylamine   总被引：1，自引：0，他引：1  

M. Mirmohammadi  R. Bayat  H. Keshavarzi Shirazi  S. Sotoudeheian 《International Journal of Environmental Science and Technology》2014,11(1):183-190

In this study, a laboratory-scale biotrickling filter (BTF) is used to remove Triethylamine (TEA) from gaseous wastes. The BTF is made of stainless steel with a height of 210 cm and an internal diameter of 21 cm packed with lava rocks. TEA elimination pattern was evaluated by changing empty bed residence times (EBRTs). The maximum elimination capacity (EC) has been determined to be 87 g/m³/h. At all EBRTs 52, 31, 20, and 10 s, contaminant transferring from gas phase to liquid was more than the EC. Also, the removal efficiency was 100 % for a mass loading of 100 g/m³/h. While the liquid recirculation velocity of 3.466 m³/m²/h was maintained, the flow rate was adjusted to 60, 100, 156, and 312 L/min. The results show that due to the high solubility of TEA in water for all the EBRTs, TEA can be solved in the circulated liquid and then be degraded gradually by microorganisms. Therefore, the least EBRT of 10 s is more appropriate.  相似文献