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RISS 인기검색어
- 검색키워드
- 저자 : Ayşegül Durmuş (검색결과 2 건)
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A reliable approach for determining concrete strength in structures by using cores
Ayşegül Durmuş,Hasan Tahsin Öztürk,Ahmet Durmuş 사단법인 한국계산역학회 2013 Computers and Concrete, An International Journal Vol.11 No.5
As known, concrete classes are described as strength of standard specimens produced and kept in ideal conditions, not including reinforcement and not subjected to any load effect before. Under the circumstances, transforming core strengths to the standard specimen strength is necessary and considering all parameters, affected on the core strength, is inevitable. In fact, effects of the reinforcement and the load history on concrete strength are generally neglected when these mentioned transforms are performing. The main purpose of this paper is investigating the effects of the reinforcement and the load history on the core strength. This investigation is experimentally performed on cores drilled from specimens having different keeping conditions, reinforced, unreinforced, subjected to bending and central pressure in various proportions of failure load during specified periods. Obtained results show that the importance of these effects cannot be neglected.
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Investigation of wall flexibility effects on seismic behavior of cylindrical silos
Ramazan Livaoğlu,Ayşegül Durmuş 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.1
This paper is concerned with effects of the wall flexibility on the seismic behavior of groundsupported cylindrical silos. It is a well-known fact that almost all analytical approximations in the literatureto determine the dynamic pressure stemming from the bulk material assume silo structure as rigid. However, it is expected that the horizontal dynamic material pressures can be modified due to varying horizontal extensional stiffness of the bulk material which depends on the wall stiffness. In this study, finite element analyses were performed for six different slenderness ratios according to both rigid and flexible wall approximations. A three dimensional numerical model, taking into account bulk material-silo wall interaction, constituted by ANSYS commercial program was used. The findings obtained from the numerical analyses were discussed comparatively for rigid and flexible wall approximations in terms of the dynamic material pressure, equivalent base shear and bending moment. The numerical results clearly show that the wall flexibility may significantly affects the characteristics behavior of the reinforced concrete (RC) cylindrical silos and magnitudes of the responses under strong ground motions.
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