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RISS 인기검색어
- 검색키워드
- 저자 : Shuling Gao (검색결과 3 건)
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Optimal Design of Micro-expanded ECC and Its Interfacial Bonding Property with Steel Tube
Shuling Gao,Yuyang Zhang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.10
The large shrinkage strain of Engineered Cementitious Composites (ECC) seriously affects its combined application with steel tube in engineering. In order to reduce the shrinkage of ECC and realize the effective bonding between ECC and steel tube, this paper studied the effects of single or multiple doped of expansive and internal curing agent on the shrinkage and mechanical properties of ECC, and tested the interfacial bond strength between ECC and steel tube. CaO and MgO compound expansive agent (CME), calcium sulfoaluminate expansive agent (HCSA), super water-absorbing polymer (SAP) internal curing agent are chosen for test. The results show that ECC mixed with 10% CME expansive agent and 0.2% SAP shows a slight expansion under the condition of sprinkling water curing. Moreover, the push-out test shows that the bond strength between micro-expanded ECC and steel tube reaches 1.27 MPa, which is nearly 2 times higher than that of the ordinary ECC, and higher than the bond strength of C50 filled steel tube. This paper provides the test and theoretical basis for the joint application of ECC with steel tube.
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Shuling Gao,Deshuai Hao,Yanping Zhu,Zhe Wang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.2
In the case of fire, ordinary mortar as the external plastering layer of masonry structure is prone to explosive peeling at high temperature. Therefore, the hybrid fiber reinforced engineered cementitious composites (HECC) is used to replace the ordinary mortar plastering to strengthenmasonry structure, so as to improve the mechanical properties of the masonry structure and the adhesion with the reinforcement layer. In this paper, PB-HECC (mixed with PVA and basalt fibers) and PS-HECC (mixed with PVA and steel fibers) are used to improve the mechanical properties after high temperature, prism compression test and triple shear test are carried out at different temperatures. The test results show that the bonding performance of the engineered cementitious composites (ECC) reinforcement layer is much better than that of ordinary mortar. When the temperature is less than 200oC, the reinforcement layer mixed with basalt fiber (PB group) or steel fiber (PS group) has a higher bearing capacity. PB group has strong energy consumption capacity, but its shear strength decreases the most; When the temperature exceeds 200oC, PS group has the highest compressive capacity, shear bearing capacity and deformation capacity, maintaining relatively good residual mechanical properties.
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Operation and Modulation of H7 Current Source Inverter with Hybrid SiC and Si Semiconductor Switches
Weiqi Wang,Feng Gao,Shuling Rui 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper proposes a H7 current source inverter (CSI) with a single shunt-connected silicon carbide (SiC) switch and traditional H6 CSI circuitry, which could employ the superior characteristics of SiC switch to significantly increase the whole switching frequency with expected low losses simultaneously. A novel modulation scheme for H7 current source inverter is then proposed, which can significantly reduce the switching counts and meanwhile realize the zero current switching (ZCS) for the rear-end CSI circuitry. The proposed H7 current source inverter can guarantee the high performance and high efficiency with a smaller DC inductor. To some extent, the H7 current source inverter circuitry could be a universal solution for all CSI systems. Matlab simulations and experimental verifications have been presented to show the performance of proposed inverter.
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