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RISS 인기검색어
- 검색키워드
- 저자 : Shui-Long Shen (검색결과 2 건)
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A Design Approach for the Interior Anchorage Zone of Post-tensioned Concrete Structure
Jian-Li Zhao,Shui-Long Shen,Lin-Bing Wang,Jun Chen 대한토목학회 2011 KSCE Journal of Civil Engineering Vol.15 No.3
For the interior anchorage zone in post-tensioned concrete structure, International Federation for Presterssing (FIP) proposed a design method based on the theory of Strut-and-Tie Model (STM) (called FIP-STM in the following context). However, the condition of FIP-STM is that the dimension ratio of anchor, b/h, is equal to 1/9. In this paper, the stress distribution in interior anchorage zone was analyzed via using Finite Element Method (FEM) at first. The relationship between ratio of internal force over post-tensioned load (F/P) and dimension ratio (b/h) (F/P-b/h curve) was obtained. FEM results show that in case of b/h<1/9, the interior anchorage zone can be simplified to the core region, in which b/h is equal to 1/9 and FIP-STM is still applicable. However, in case of b/h>1/9, the amount of non-prestressed rebar designed in interior anchorage zone by use of FIP-STM is more than that required, and in some cases it is difficult to allocate non-prestressed rebar in the crowded space. Based on the results of stress analysis, a modified approach for FIP-STM was presented, which can be applied for any dimension ratio. With the proposed modification on FIP-STM, the non-prestressed rebar can be reasonably allocated in the narrow space of interior anchorage zone via modifying the internal forces and geometry of FIP-STM. The analytical result shows that for interior anchorage zone about 30% of non-prestressed rebar can be reduced via using the proposed method compared with that using FIP-STM if b/h is equal to 3/10.
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Numerical And Sensitivity Analysis of Bearing Reinforcement Earth (BRE) Wall
Cherdsak Suksiripattanapong,Suksun Horpibulsuk,Avirut Chinkulkijniwat,Jin Chun Chai,Shui-Long Shen,Arul Arulrajah,Apichat Suddeepong 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.1
Numerical and sensitivity analysis of the Bearing Reinforcement Earth (BRE) wall were carried out using PLAXIS 2D. The numerical and sensitivity analysis was performed by varying the foundation conditions (thickness, T and modulus of elasticity, E of the weathered crust) and the BRE wall properties (number of transverse members, n, reinforcement length, L, wall height, H, reinforcement vertical spacing, Sv and axial stiffness of reinforcement, EA). The studied L/H ratio is between 0.7 and 1.0 and the geotextiles elements were used to model the reinforcement. The settlement of the BRE wall is governed by E, T, and H, irrespective of the BRE wall properties. The bearing stress distribution is essentially the same even with different E, T, n, Sv, EA. The magnitude of bearing stress is mainly controlled by H. The lateral movement pattern is primarily dependent upon Sv for a particular H. The inward movement exists for small Sv value while the outward movement exists for large Sv value. The magnitude of lateral movement is controlled by E, T, L and n. For a particular foundation condition (E and T), an increase in n is more advantageous than an increase in L because the lateral movement is insignificantly reduced when L/H > 0.8. The maximum tension and AASHTO recommended failure plane were found not to coincide in the serviceability state. In the serviceability state, the tie points must be stronger than the reinforcements for the wall height > H/2 while the reinforcement must be stronger than the tie point for the wall height < H/2. The simplified K versus H relationship is a practical tool to examine the factor of safety based on the conventional method.
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