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| Research on the Flexural Behavior of Assembled Long Floating Slab with High Performance Concrete Wet Joint |
| LI Qi1, SONG Qingyuan1, ZHENG Yue1, DUAN Guiping2, CHEN Gaofeng3 |
1. Tongji University, Shanghai 200092, China;
2. Shanghai Shentong Metro Group Co. Ltd, Shanghai 201103, China;
3. GERB (Qingdao) Vibration Control Co. Ltd, Qingdao, Shandong 266108, China |
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Abstract Research purposes: In order to validate a new scheme of assembled long floating slab track connected by precast short slabs through wet joints using high performance concrete, static load tests and nonlinear finite element simulations are carried out to obtain the ultimate flexural capacity of the structure. On this basis, the numerical models with different diameters of steel bar, shape and strength of wet joint concrete are established and discussed to provide the reference for the design of the new floating slab.
Research conclusions:(1) The static load tests show that the ultimate flexural capacity of the floating slab is about 720 kN·m, which is basically consistent with the numerical simulation results and much larger than the design moment of the floating slab track. (2) With the reducing of the diameter of longitudinal steel bars in floating slab, the cracking load of the slab barely change, but its ultimate flexural capacity decreases, and the stress amplitude of the steel bars increases. (3) The joints of diamond and cuneiform shape have better performance than rectangular one. (4) The change of wet joint concrete strength has insignificant effect on the flexural capacity of the slab as long as the bonding strength between the concrete and steel bars is sufficient. (5) The research result can provide a basis for the design and application of the new floating slab track system.
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Received: 21 January 2022
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2022, Vol. 39 
