Transmission spectra of coupled cavity structures （CCSs） in two-dimensional （2D） photonic crystals （PCs） are investigated using a coupled mode theory, and an optical filter based on CCS is proposed. The performa...Transmission spectra of coupled cavity structures （CCSs） in two-dimensional （2D） photonic crystals （PCs） are investigated using a coupled mode theory, and an optical filter based on CCS is proposed. The performance of the filter is investigated using finite-difference time-domain （FDTD） method, and the results show that within a very short coupling distance of about 3λ, where ）, is the wavelength of signal in vacuum, the incident signals with different frequencies are separated into different channels with a contrast ratio of 20 dB. The advantages of this kind of filter are small size and easily tunable operation frequencies.展开更多
随着装配式建筑在我国的推广应用越来越广泛,装配式构件在爆炸荷载下的性能值得深入研究。利用LS-DYNA显示动力分析软件对PC柱在近爆荷载下的动力响应及破坏模式进行数值模拟分析。计算了PC柱在8 kg TNT爆炸当量,爆炸距离(TNT炸药中心...随着装配式建筑在我国的推广应用越来越广泛,装配式构件在爆炸荷载下的性能值得深入研究。利用LS-DYNA显示动力分析软件对PC柱在近爆荷载下的动力响应及破坏模式进行数值模拟分析。计算了PC柱在8 kg TNT爆炸当量,爆炸距离(TNT炸药中心至结构表面)为0.6 m,比例距离为0.3 m/kg^(1/3)动力响应,分析轴压比、混凝土强度等级、截面惯性矩以及箍筋、纵筋配筋率对PC柱抗爆性能的影响,并与普通RC柱进行了对比研究。研究发现,有无轴压比对PC柱的抗爆性能影响很大,存在轴压比的时,PC柱的侧向位移明显较小。提高混凝土等级,增大截面惯性矩以及增加纵筋配筋率均可提升PC柱抗爆性能,箍筋配筋率影响较小。在相同模拟工况下,RC柱与PC柱破坏形式有所不同,PC柱表现出了更好的抗爆性能。展开更多
文摘Transmission spectra of coupled cavity structures （CCSs） in two-dimensional （2D） photonic crystals （PCs） are investigated using a coupled mode theory, and an optical filter based on CCS is proposed. The performance of the filter is investigated using finite-difference time-domain （FDTD） method, and the results show that within a very short coupling distance of about 3λ, where ）, is the wavelength of signal in vacuum, the incident signals with different frequencies are separated into different channels with a contrast ratio of 20 dB. The advantages of this kind of filter are small size and easily tunable operation frequencies.
文摘随着装配式建筑在我国的推广应用越来越广泛,装配式构件在爆炸荷载下的性能值得深入研究。利用LS-DYNA显示动力分析软件对PC柱在近爆荷载下的动力响应及破坏模式进行数值模拟分析。计算了PC柱在8 kg TNT爆炸当量,爆炸距离(TNT炸药中心至结构表面)为0.6 m,比例距离为0.3 m/kg^(1/3)动力响应,分析轴压比、混凝土强度等级、截面惯性矩以及箍筋、纵筋配筋率对PC柱抗爆性能的影响,并与普通RC柱进行了对比研究。研究发现,有无轴压比对PC柱的抗爆性能影响很大,存在轴压比的时,PC柱的侧向位移明显较小。提高混凝土等级,增大截面惯性矩以及增加纵筋配筋率均可提升PC柱抗爆性能,箍筋配筋率影响较小。在相同模拟工况下,RC柱与PC柱破坏形式有所不同,PC柱表现出了更好的抗爆性能。
