Seismic response analysis of self-anchored suspension bridge with multi-tower

Seismic performance of a self-anchored suspension bridge with three-tower were investigated. A three-dimensional nonlinear finite element model of the bridge was developed using Sap2000. Nonlinear time history analysis was conducted using Fast Nonlinear Analysis Method (FNA), while beam-column effect and nonlinear behavior of bearing and damper were taken into consideration. The analyze results showed that the middle tower was more vulnerable compared with the two side towers; there existed risk of buckling of composite beam, and the most vulnerable part lied near steel-concrete composite segment. Viscous dampers were effective to reduce seismic response of towers as well as girders.

     

Time-dependent reliability of ageing structures: an approximate approach

Concrete structures may deteriorate over time due to aggressive service environments, leading to a reduction in their strengths, stiffnesses and reliabilities. In general, the assessment of time-dependent reliability of ageing structures must consider uncertainties in structural deterioration as well as non-stationarities in the structural load processes. This paper develops an approximate method for assessing the impact of structural deterioration and non-stationary live loads on structures, which requires only low-dimensional integration and reduces the cost of assessing time-dependent reliability over a service life extending to 50 years significantly. This approximate method is demonstrated through several examples. The importance of non-stationarities in the resistance and load processes on time-dependent reliability is illustrated and the accuracy of the method is confirmed in several cases utilising Monte Carlo simulation.     

城市高压管网供气能力评估与调配初探

本文对已建成的城市高压管网的供气情况进行了调查与分析研究,并借助于供气数据远传与标准数据修正,探寻出适合现有高压管网供气的计算公式,以此来对现有高压管网和未来建设的高压管网的供气能力进行测算。在借助燃气调度的情况下,对高压管网可能达到的供气能力进行评估,并以此来指导未来工程项目的实施计划。     

Ultrafast terahertz responses in monolayer graphene

ABSTRACT

We theoretically investigate the ultrafast terahertz (THz) properties of monolayer graphene. The analytical formulations of the photon carrier, electric polarization and optical current are obtained by solving the Bloch-equations in present of the ultrafast THz Gaussian pulse. Graphene shows a large nonlinear and ultrafast optical response at THz frequencies due to the gapless and relativistic Dirac particles with nearly linear energy dispersion. It is found that the photon carrier density, electric polarization and optical current density increase with increasing the frequency of the THz pulse. These theoretical results are in agreement with recent experimental findings. This study confirms further that graphene exhibits important features and is relevant to the applications in the ultrafast THz fields.     

唐口煤业9301工作面“绿色”充填开采技术

本文叙述了唐口煤业公司首个充填开采工作面-9301工作面的充填原理及相关的充填技术要求,并且论述了沿空留巷技术方案以及为满足9301充填工作面通风要求而进行的工作面推进3.5m时的切眼留巷技术方案。预计9301工作面通过的充填开采,下沉较小,地表建(构)筑物采动损害等级均在轻微的Ⅰ级采动损害范围内。     

“建筑”作为公共话语的出现:一个词语的断代史

回顾从19世纪末到20世纪初在中国近代社会观念和文教制度剧变的特定背景下,“建筑”这个词语在现代汉语以及社会大众观念话语中的历史性出现的过程,并试图多角度全方位地阐明这一历史性的事件是“如何可能”的.以词语或概念为建筑史研究的对象,是希望以词为镜,折射出宏观的社会观念史在特定历史时刻的变迁.     

基于现场试验的水文地质参数计算可视化程序设计与应用

水文地质参数的计算工作一直是工程地质和水文地质界工程师们所关注的重点问题之一,传统的计算方法比较繁琐、费时,国内外目前也没有比较全面的水文地质求参软件,因此,本文利用Visual Basic语言研究开发了一款基于现场试验的水文地质参数计算的新型软件SHP,通过数据库调用Excel文件录入数据,利用最小二乘法原理拟合直线。实现了手动配线和自动配线两种方法求参。通过南京市玄武湖隧道工程实例的校验,结果表明,该软件实用性强、计算精度较高、人机交互简单,满足工程需要。     

Erratum to: Experimental research on overlying strata movement and fracture evolution in pillarless stress-relief mining

International Journal of Coal Science & Technology -     

苏联“民族形式、社会主义内容”建筑理论来源与演变之初探

借助事件与时间节点相对应的史学研究方法;依据相关事件的开放档案,清晰梳理“民族形式、社会主义内容”建筑理论生成的历史脉络,揭示这一标志性话语,从口号转变为文艺创作及建筑设计理论的过程中,其背后容易被忽略的社会、政治及历史信息。