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RISS 인기검색어
- 검색키워드
- 저자 : Teerawong, J. (검색결과 5 건)
- 무료
- 기관 내 무료
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Strength enhancement in confined concrete with consideration of flexural flexibilities of ties
Teerawong, J.,Lukkunaprasit, P.,Senjuntichai, T. Techno-Press 2004 Structural Engineering and Mechanics, An Int'l Jou Vol.18 No.2
The interaction between concrete core expansion and deformation of perimeter ties has been known to have a significant effect on the effective confinement of rectangular reinforced concrete (RC) tied columns. This interaction produces passive confining pressure to the concrete core. Most existing models for determining the response of RC tied columns do not directly account for the influence of flexural stiffness of the ties and the variation of confining stress along the column height. This study presents a procedure for determining the confined compressive strength of RC square columns confined by rectilinear ties with various tie configurations considering directly the influence of flexural flexibility of the ties and the variation of confining stress along the vertical direction. The concept of area compatibility is employed to ensure compatibility of the concrete core and steel hoop in a global sense. The proposed procedure yields satisfactory predictions of confined strengths compared with experimental results, and the influence of tie flexibility, tie configuration and degree of confinement can be well captured.
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New strut-and-tie-models for shear strength prediction and design of RC deep beams
Panatchai Chetchotisak,Jaruek Teerawong,Sukit Yindeesuk,송준호 사단법인 한국계산역학회 2014 Computers and Concrete, An International Journal Vol.14 No.1
Reinforced concrete deep beams are structural beams with low shear span-to-depth ratio, and hence in which the strain distribution is significantly nonlinear and the conventional beam theory is not applicable. A strut-and-tie model is considered one of the most rational and simplest methods available for shear strength prediction and design of deep beams. The strut-and-tie model approach describes the shear failure of a deep beam using diagonal strut and truss mechanism: The diagonal strut mechanism represents compression stress fields that develop in the concrete web between diagonal cracks of the concrete while the truss mechanism accounts for the contributions of the horizontal and vertical web reinforcements. Based on a database of 406 experimental observations, this paper proposes a new strut-and-tie-model for accurate prediction of shear strength of reinforced concrete deep beams, and further improves the model by correcting the bias and quantifying the scatter using a Bayesian parameter estimation method. Seven existing deterministic models from design codes and the literature are compared with the proposed method. Finally, a limit-state design formula and the corresponding reduction factor are developed for the proposed strut-andtie model.
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Panatchai Chetchotisak,Jaruek Teerawong 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.8
A safety assessment of various methods for designing RC (reinforced concrete) pile caps, consisting of the traditional and strutand-tie methods (STMs) available in the international concrete codes of practice and state-of-the-art literature, was conducted using a probabilistic approach and is presented in this paper. The uncertainties in load effects and member strengths, including variability in material properties, dimensions and modeling error were considered as random variables. The safety index used as an indication of level of safety was analyzed utilizing Monte Carlo simulation with a wide range of live-to-dead load ratios and a usual range of normal strength concrete. It was found that the traditional method of American concrete code (ACI 318-14) and the shear design using British code (BS 8110) provided a lower level of safety than the STM approaches. Finally, for each pile cap design method, reliability-based understrength factors are proposed to satisfy the target safety index by more than 3.5.
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Interactive strut-and-tie-model for shear strength prediction of RC pile caps
Panatchai Chetchotisak,Sukit Yindeesuk,Jaruek Teerawong 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.20 No.3
A new simple and practical strut-and-tie model (STM) for predicting the shear strength of RC pile caps is proposed in this paper. Two approaches are adopted to take into account the concrete softening effect. In the first approach, a concrete efficiency factor based on compression field theory is employed to determine the effective strength of a concrete strut, assumed to control the shear strength of the whole member. The second adopted Kupfer and Gerstle’s biaxial failure criterion of concrete to derive the simple nominal shear strength of pile caps containing the interaction between strut and tie capacity. The validation of these two methods is investigated using 110 RC pile cap test results and other STMs available in the literature. It was found that the failure criterion approach appears to provide more accurate and consistent predictions, and hence is chosen to be the proposed STM. Finally, the predictions of the proposed STM are also compared with those obtained by using seven other STMs from codes of practice and the literature, and were found to give better accuracy and consistency.
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