Civil Engineering / İnşaat Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/13

Browse

Filters

2014 - 20192

Settings

Department: search.filters.department.İzmir Institute of Technology. Civil EngineeringSubject: search.filters.subject.Energy dissipation

Search Results

Now showing 1 - 2 of 2
  • Article
    Citation - WoS: 24
    Citation - Scopus: 30
    Energy Dissipation and Performance Assessment of Double Damped Outriggers in Tall Buildings Under Strong Earthquakes
    (John Wiley and Sons Inc., 2019) Morales-Beltran, Mauricio; Turan, Gürsoy; Dursun, Onur; Nijsse, Rob
    The use of a single set of outriggers equipped with oil viscous dampers increases the damping ratio of tall buildings in about 6–10%, depending on the loading conditions. However, could this ratio be further increased by the addition of another set of outriggers? Should this additional set include dampers too? To answer these questions, several double damped outrigger configurations for tall buildings are investigated and compared with an optimally designed single damped outrigger, located at elevation 0.7 of the total building's height (h). Using free vibration, double outrigger configurations increasing damping up to a ratio equal to the single-based optimal are identified. Next, selected configurations are subjected to several levels of eight ground motions to compare their capability for avoiding damage under critical excitations. Last, a simplified economic analysis highlights the advantages of each optimal configuration in terms of cost savings. The results show that, within the boundaries of this study, combining a damped outrigger at 0.5h with a conventional outrigger at 0.7h is more effective in reducing hysteretic energy ratios and economically viable if compared with a single damped outrigger solution. Moreover, double damped outrigger configurations for tall buildings exhibit broader display of optimal combinations, which offer flexibility of design to the high-rise architecture.
  • Article
    Citation - Scopus: 35
    Experimental Investigation of Screens as Energy Dissipaters in Submerged Hydraulic Jump
    (Türkiye Klinikleri Journal of Medical Sciences, 2014) Sadeghfam, Sina; Akhtari, Ali Akbar; Daneshfaraz, Rasoul; Tayfur, Gökmen
    This study investigated the effectiveness of screens as energy dissipaters in small hydraulic structures using physical experiments. In the experimental design, the Froude number, screen arrangements, and screen porosity were the major controlling parameters. The experiments covered a range of Froude numbers between 2.5 and 8.5, screen porosity of 40% and 50%, and gaps of double screens between 1 and 5 cm. The main goal of this study was investigation of the screens creating submerged hydraulic jumps. The flow depth was digitally measured in order to perceive the turbulences and validate the results of energy dissipation against those of the methods in the literature. The experimental results show the importance of each parameter on the screen performance. The screens with double arrangement with the imposed hydraulic jump dissipated more energy. The gaps of the double arrangement had an insignificant effect on energy dissipation. The double screen with porosity of 40% had the best performance. Since the Froude number was found to be the most effective parameter, quadratic equations as a function of this number were fitted to the experimental results with high R2 and very low RMSE values. The quadratic equations can be employed as interpolators and/or extrapolators.