Dynamic Responses Analysis of a Building Structure Subjected to Ground Shock from a Tunnel Explosion

Dynamic responses of a multi-storey building without or with a sliding base-isolation device for ground shock induced by an in-tunnel explosion are numerically analyzed. The effect of an adjacent tunnel in between the building and the explosion tunnel, which affects ground shock propagation , is considered in the analysis. Different modeling methods, such as the eight-node equal-parametric finite element and mass-lumped system, are used to establish the coupling model consisting of the two adjacent tunnels, the surrounding soil medium with the Lysmer viscous boundary condition, and the multi-storey building with or without the sliding base-isolation device. In numerical calculations , a continuous friction model, which is different from the traditional Coulomb friction model, is adopted to improve the computational efficiency and reduce the accumulated errors. Some example analyses are subsequently performed to study the response characteristics of the building and the sliding base-isolation device to ground shock. The effect of the adjacent tunnel in between the building and the explosion tunnel on the ground shock wave propagation is also investigated. The final conclusions based on the numerical results will provide some guidance in engineering practice.     

生产力与人的教育

生产力是人的实际能力，是客观的，非单个人能力的几何体，生产力的发展离不开人的发展，人的发展和社会的发展是一致的，教育在人的发展中有着特殊的作用。在科技是第一生产力的意义上，教育也是第一生产力。     

加快推进林业产权制度改革是发展林业生产力的根本措施

林业产权归属不清、权责不明,林业税费过高,林农负担过重,经营机制不活,产权流转不畅等问题严重制约了林业的发展,并成为瓶颈所在。福建、江西等省的林权制度改革,极大地调动了广大林农造林护林的积极性,促进了非公有制林业的快速发展。事实证明,加快推进林权制度改革,是发展林业生产力的根本措施之一。     

介质极化和磁化的八元数理论

利用八元数方法研究介质的极化和磁化，给出了一些新的极化和磁化方程，揭示了极化和磁化的关系。     

电力系统故障信息及其在继电保护中的应用

综述了电力系统故障信息的种类和小波变换在提取故障分量中的应用；介绍了当前继电保护专家们提出的行波保护、无通道保护等新型保护的基本原理。     

一类(2+1)维非线性波方程新解

使用Jacobi椭圆函数展开法 ,研究 (2 + 1)维KPI方程和 (2 + 1)维Bounessiq方程的周期解和孤波解 ,并借助计算机代数系统Maple ,通过图形分析法 ,给出多解     

A new photonic bandgap cover for a patch antenna with a photonic bandgap substrate

INTRODUCTIONInvestigationofphotonicbandgap(PBG)materialsiscurrentlyoneofthemostactivefron-tiersinengineeringandphysics.PBGmaterialshaverecentlyemergedasanewmultidisciplinaryfieldofstudy(Kesleretal.,1996;Yablonovitch,1994;SimovskiandHe,2001).APBGstructurecanhaveabandgapwithinwhichelectromagnetic(EM)wavepropagationispreventedinalldirec-tions(Joannopoulosetal.,1997;Ozbayetal.,1994).Foratwo-dimensionalPBGmaterial,thepropagationofanEMwavewithinitsbandgapispreventedinalldirectionswithin…     

2+1维破切孤子方程的分支和行波解(英文)

运用动力系统原理研究2+1维破切孤子方程的行波解,得到了参数空间不同区域上所有可能的精确解.     

再论中国共产党的创建与中国先进生产力的发展要求

从对加深党成立的历史必然性和先进性的认识,领会党的历史使命与党领导和进行民主革命的道理,认识提出"三个代表"重要思想和坚持生产力标准的历史依据等三个方面说明了研究中国共产党创建的生产力基础问题的重要意义.     

生产力的系统结构——兼论协作的生产力性质

生产力是一个巨系统 ,由要素系统、水平系统和历史系统三大子系统组成 ;其中的要素系统由物质生产力、精神生产力和协作生产组成 ,生产力的发展是这三大生产力共同推动的结果