某钢框架多塔建筑项目包含三栋钢框架塔楼以及设置于塔楼顶部的钢桁架高位连体天空之厅,最大连体跨度为68.5m。首先通过多方向试算的方法研究在不同的地震动输入角度下支座层及基底层地震反应,得出结构的不利地震作用效应可能出现在不...某钢框架多塔建筑项目包含三栋钢框架塔楼以及设置于塔楼顶部的钢桁架高位连体天空之厅,最大连体跨度为68.5m。首先通过多方向试算的方法研究在不同的地震动输入角度下支座层及基底层地震反应,得出结构的不利地震作用效应可能出现在不同的地震动输入方向上,从而确定了最不利地震方向。然后通过时程分析法,采用MIDAS Gen 2020软件对结构跨度大、刚度偏柔的天空之厅在不同激励组合工况下的舒适度进行分析。最后采用有限单元法以中震及大震构件内力包络值作为边界条件对关键节点进行弹塑性分析。分析结果表明,舒适度满足正常使用要求,关键节点满足抗震性能要求。展开更多
Stimulated Raman scattering(SRS)is one of the main instabilities affecting success of fusion ignition.Here,we study the relationship between Raman growth and Landau damping with various distribution functions combinin...Stimulated Raman scattering(SRS)is one of the main instabilities affecting success of fusion ignition.Here,we study the relationship between Raman growth and Landau damping with various distribution functions combining the analytic formulas and Vlasov simulations.The Landau damping obtained by Vlasov-Poisson simulation and Raman growth rate obtained by Vlasov-Maxwell simulation are anti-correlated,which is consistent with our theoretical analysis quantitatively.Maxwellian distribution,flattened distribution,and bi-Maxwellian distribution are studied in detail,which represent three typical stages of SRS.We also demonstrate the effects of plateau width,hot-electron fraction,hot-to-cold electron temperature ratio,and collisional damping on the Landau damping and growth rate.They gives us a deep understanding of SRS and possible ways to mitigate SRS through manipulating distribution functions to a high Landau damping regime.展开更多
基金supported by the National Key Research and Development Program of China(2018YFB2101003)the National Natural Science Foundation of China(51991395,51991391,71901011,and U1811463)。
文摘某钢框架多塔建筑项目包含三栋钢框架塔楼以及设置于塔楼顶部的钢桁架高位连体天空之厅,最大连体跨度为68.5m。首先通过多方向试算的方法研究在不同的地震动输入角度下支座层及基底层地震反应,得出结构的不利地震作用效应可能出现在不同的地震动输入方向上,从而确定了最不利地震方向。然后通过时程分析法,采用MIDAS Gen 2020软件对结构跨度大、刚度偏柔的天空之厅在不同激励组合工况下的舒适度进行分析。最后采用有限单元法以中震及大震构件内力包络值作为边界条件对关键节点进行弹塑性分析。分析结果表明,舒适度满足正常使用要求,关键节点满足抗震性能要求。
基金supported by the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDA25050700)the National Natural Science Foundation of China(Grant Nos.11805062,11875091 and 11975059)+1 种基金the Science Challenge Project(Grant No.TZ2016005)the Natural Science Foundation of Hunan Province,China(Grant No.2020JJ5029)。
文摘Stimulated Raman scattering(SRS)is one of the main instabilities affecting success of fusion ignition.Here,we study the relationship between Raman growth and Landau damping with various distribution functions combining the analytic formulas and Vlasov simulations.The Landau damping obtained by Vlasov-Poisson simulation and Raman growth rate obtained by Vlasov-Maxwell simulation are anti-correlated,which is consistent with our theoretical analysis quantitatively.Maxwellian distribution,flattened distribution,and bi-Maxwellian distribution are studied in detail,which represent three typical stages of SRS.We also demonstrate the effects of plateau width,hot-electron fraction,hot-to-cold electron temperature ratio,and collisional damping on the Landau damping and growth rate.They gives us a deep understanding of SRS and possible ways to mitigate SRS through manipulating distribution functions to a high Landau damping regime.
