Empirical design of scour protections around monopile foundations: Part 1: Static approach

Together with new opportunities, offshore wind farms raise new engineering challenges. An important aspect relates to the erosion of bottom material around the foundation of the wind turbines, caused by the local increase of the wave and current induced flow velocities by the pile's presence. Typically, the expected scour has a considerable impact on the stability and dynamic behavior of the wind turbine and a scour protection is placed to avoid erosion of the soil close to the foundation. Although much experience exists on the design of scour protections around bridge piers (which are placed in a current alone situation), at present, little design guidelines exist for the specific case of a scour protection around a monopile foundation subjected to a combined wave and current loading.     

底拖网浮沉力配备设计计算

本文提出了一套底拖网浮沉力配备的计算式子，并根据中国沿海现有几十种较有代表性的底层有翼单囊拖网网具资料，统计了大量的浮沉力配备生产经验数据ｆｆ、ｆｑ和Ｆｆｑ，举例介绍了这些浮沉力配备生产经济数据的统计以及根据生产经验数据或根据动力相似原理的两种浮沉力配备设计的计算方法。     

小型船用油水分离器的设计

介绍ＣＹＦ—０．０５／ＣＹＦ—０．１型油水分离器的主要技术参数、工作原理、设计计算、台架试验。试验表明，经本装置处理后的油污水满足ＧＢ３５５２—８３“船舶污染物排放标准”所规定的排放标准。     

《四川省“十二五”规划纲要》专题地图的设计与编制

本文详细介绍了《四川省“十二五”规划纲要》中专题地图的设计与编制方法,包括地理底图的编制,专题内容的表现形式设计,色彩和符号的设计。     

我国工程勘察设计行业管理现状浅析及建议

工程勘察设计行业在我国国民经济的发展中有着重要作用和特殊地位。本文介绍了我国工程勘察设计行业的发展历程,分析了目前工程勘察设计行业管理的现状、存在的问题,提出了进一步完善行业管理的建议。     

海上实习综合信息管理系统的设计与实现

基于院校实习图库的特点,探讨了海上实习综合信息管理系统的设计与实现方法。该系统通过资源共享,提高航海图书资料的利用率;建立快速高效的航海图书资料的查询、检索和借阅,并且实现航海图书资料的增减、及时更新和日常维护,保证了航海图书资料的现势性和准确性,对于实现航海保障模式的信息化、现代化有着重要指导意义。     

基于地理设计的三维道路设计系统研究与实现

道路规划设计是一项复杂的系统工程,现阶段道路设计采用传统的平台难以适应空间分析、三维展现、交互设计等新的需求,更不能充分利用GIS分析、参数化设计等新技术为设计服务。地理设计的诞生为将设计与分析的融合提供了指导思想,参数化设计则为基于规则的道路设计提供技术基础。本文以地理设计为指导、以参数化驱动设计为手段,构建一个基于三维地理环境的道路设计系统,阐述地理设计、参数化驱动设计在系统中的作用及系统的结构组成,最后展现系统建设成果。     

Modeling of spatially correlated,site-reflected,and nonstationary ground motions compatible with response spectrum

Seismic risk analysis and mitigation of spatially extended structures require the synthesis of spatially varying ground motions in the response history analysis of these structures. These synthetic motions are usually desired to be spatially correlated, site reflected, nonstationary, and compatible with target design response spectra. In this paper, a method is presented for simulating spatially varying ground motions considering the nonstationarity, local site effects, and compatibility of response spectra. The scheme for generating spatially varying and response spectra compatible ground motions is first established for spatial locations on the ground surface with varying site conditions. The design response spectrum is introduced as the “power” spectrum at the base rock. The site amplification approach is then derived based on the deterministic wave propagation theory, by assuming that the base rock motions consist of out-of-plane SH wave or in-plane combined P and SV waves propagating into the site with assumed incident angles, from which tri-directional spatial ground motions can be generated. The phase difference spectrum is employed to model ground motions exhibiting nonstationarity in both frequency and time domains with different site conditions. The proposed scheme is demonstrated with numerical examples.     

促进绿色建筑在中国的发展——美国和欧盟的经验借鉴

建筑是能源消耗大户,也是导致环境污染与气候变化的原因之一.推动绿色建筑的发展,是实现低碳经济与可持续发展的重要路径.当前,中国已经颁布了一些法律法规以及通过信息工具——绿色建筑认证等制度措施来推动绿色建筑的发展,但是实践中存在一些问题,相关制度设计也不够成熟.美国以及欧盟在绿色建筑方面的立法与实践经验相对比较丰富.中国可以借鉴这些国家的一些成功经验,采取一些措施促进绿色建筑的发展,如提高人们对绿色建筑的认识,设计出更多样化的激励工具等等.     

Development of regionalized joint probability approach to flood estimation: a case study for Eastern New South Wales,Australia

Estimation of design flood in ungauged catchments is a common problem in hydrology. Methods commonly adopted for this task are limited to peak flow estimation, e.g. index flood, rational and regression‐based methods. To estimate complete design hydrograph, rainfall–runoff modelling is preferred. The currently recommended method in Australia known as Design Event Approach (DEA) has some serious limitations since it ignores the probabilistic nature of principal model inputs (such as temporal patterns (TP) and initial loss) except for design rainfall depth. A more holistic approach such as Joint Probability Approach (JPA)/Monte Carlo Simulation Technique (MCST) can overcome some of the limitations associated with the DEA. Although JPA/MCST has been investigated by many researchers, it has been proved to be difficult to apply since its routine application needs readily available regional design data such as stochastic rainfall duration, TP and losses, which are largely unavailable for Australian states. This paper presents regionalization of the model inputs/parameters to the JPA/MCST for eastern New South Wales (NSW) in Australia. This uses data from 86 pluviograph stations and six catchments from NSW to regionalize the input distributions for application with the JPA/MCST. The independent testing to three test catchments shows that the regionalized JPA/MCST generally outperforms the at‐site DEA. The developed regionalized JPA/MCST can be applied at any arbitrary location in eastern NSW. The method and design data developed here although primarily applicable to eastern NSW can be adapted to other Australian states and countries. Copyright © 2013 John Wiley & Sons, Ltd.