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Uniaxial compressive behaviour of a FRP standing support made of mine wastes
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作者 Zhenjun Shan Ting Ren +2 位作者 Jan Nemcik Guanzheng Wu Liang Zhao 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第8期991-1000,共10页
Twenty-seven specimens were tested to investigate the uniaxial compression behaviour of an innovative standing support for underground space applications.The innovative standing support consisted of an external fibre ... Twenty-seven specimens were tested to investigate the uniaxial compression behaviour of an innovative standing support for underground space applications.The innovative standing support consisted of an external fibre reinforced polymer(FRP)jacket and the infill column made of cementitious grout,tailings and coal wash rejects.Effects of the FRP layers number and water to the cementitious grout(w/g)ratio were evaluated.Test results indicated that lower w/g ratios produced stronger infill columns.With FRP confinement,the standing support demonstrated strain-hardening loading characteristics with a significant improvement in both strength and ductility.The highest strength and strain of the specimens achieved was 58.4 MPa and 11.8%respectively.Compared with the unconfined specimens,the confinement with four FRP layers increased the specimen strength and associated strain up to 3.6 and 27.0 times respectively.A correlation between the compressive strength of the infill material and the ultrasonic pulse velocity was also investigated.Furthermore,a simple design-oriented model was proposed to predict the peak strength and the corresponding strain of the innovative standing support. 展开更多
关键词 Standing support Underground spaces FRP Tailings and coal wash rejects design-oriented model
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考虑锁相环角频率变化的单相车网系统动态稳定性分析
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作者 喻文倩 刘志刚 +1 位作者 张友刚 刘静伟 《电力自动化设备》 EI CSCD 北大核心 2022年第12期171-176,共6页
在高速铁路中,动车组和牵引网之间的参数不匹配可能会导致低频振荡现象发生。虽然常见的阻抗分析法已被广泛用于解释这种现象,但是为了降低计算复杂度,建立了单相车网系统的时域状态空间平均模型。在该模型中,考虑了锁相环的角频率变化... 在高速铁路中,动车组和牵引网之间的参数不匹配可能会导致低频振荡现象发生。虽然常见的阻抗分析法已被广泛用于解释这种现象,但是为了降低计算复杂度,建立了单相车网系统的时域状态空间平均模型。在该模型中,考虑了锁相环的角频率变化和控制中的时间延迟,以更好地反映实际的dq解耦控制。为了避免基于Nyquist曲线或Bode图分析方法在频域中所需的输入输出阻抗的复杂计算,采用根轨迹分析了电路和控制参数对车网系统稳定性的影响。此外,还应用design-oriented分析方法对各种参数的稳定边界进行了绘制。通过比较理论分析、软件仿真和硬件在环实验结果,最终验证了所建立数学模型的准确性和所应用分析方法的有效性。 展开更多
关键词 单相车网系统 状态空间平均模型 稳定性分析 根轨迹 design-oriented分析
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Experimental Study on the Compressive Behavior of CFRP/ECCs
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作者 孙文彬 《Journal of Southwest Jiaotong University(English Edition)》 2010年第4期295-302,共8页
In this study,nine square concrete columns,including six CFRP/ECCs and three plain concrete control specimen columns,were prepared. The CFRP tubes with fibers oriented in the hoop direction were manufactured with 10,2... In this study,nine square concrete columns,including six CFRP/ECCs and three plain concrete control specimen columns,were prepared. The CFRP tubes with fibers oriented in the hoop direction were manufactured with 10,20,or 40 mm rounded corner radii at vertical edges. A 100 mm overlap in the direction of fibers was provided to ensure a proper bond. Uniaxial compression tests were conducted to investigate the compressive behaviors including the axial strength,stress-strain response,and ductility. It is evident that the CFRP tube confinement can improve the compressive behavior of concrete core,in terms of axial compressive strength or axial deformability. Based on the experimental results and some existing test database attained by other researchers,a design-oriented model is developed. The predictions of the model for CFRP/ECCs show good agreement with test results. 展开更多
关键词 Carbon fiber reinforced polymer (CFRP) Concrete column Encasement CONFINEMENT Compressive behavior Enhancement parameter design-oriented model
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