权力关系变迁中武汉都市区簇群式空间的形成机理

随着城市区域化及区域城市化态势的日益显现,一些大城市受到各种条件的影响,在都市区尺度上形成一种簇群状空间形态,武汉表现得较为典型。本文试图从权力关系变迁入手分析武汉簇群式空间的形成机理。地方各级政府间的博弈使外围区政府采用"双城"模式发展,加上在都市区空间各个方向发展较为均等的条件下,各区政府纷纷与资本结盟各自为政发展,使都市区外围空间均衡镶嵌,武汉都市区空间被"簇化"。若武汉内外环境没有较大的变动,武汉簇群式的空间态势仍会继续下去。     

新型大跨度空间结构损伤动力特性数值研究

以新型空间结构为研究对象,建立了ANSYS有限元模型,对结构的模态频率、模态振型、单频激励响应及白噪声激励下的结构响应进行了较为全面的研究.研究发现:虽然损伤对结构模态频率并不敏感,但振型对损伤却有着相当高的敏感程度;同时对结构的谐响应分析和三维白噪声激励分析发现:损伤不仅仅会对已参与结构振动的模态振型产生影响,同时还会导致产生新生的模态参与到结构的振动中及消亡部分已参与到结构振动中的模态,损伤还会造成结构模态的跃迁等现象.诸多的损伤对空间结构在动力特性方面造成的影响都为其损伤识别提供了全新的参考信息和全新的思路.     

燃气红外线辐射采暖在青海油田油管厂的应用研究

通过对2012年青海油田的重点项目井下作业公司油管(杆)清洗线改造工程生产厂房的燃气红外线辐射采暖系统进行分析研究,阐述燃气辐射供暖的工作原理、优点、设计应用过程,经计算分析结果表明,燃气辐射采暖较传统锅炉热水采暖系统节能显著。     

Ant colony optimisation of spatial steel structures under static and earthquake loading

Optimisation is the process of trying to find out the best possible solution to any problem satisfying constraints. Soft computing is the class of methods which have been inspired by the biological computational methods and nature's problem-solving strategies. Currently, these methods include neural networks, evolutionary computational models such as genetic algorithms, random cost and linguistic models such as fuzzy logic. Ant colony optimisation (ACO) is one such method applied for large engineering combinatorial optimisation problems. A design procedure utilising an ACO technique is developed for discrete optimisation of reticulated steel space trusses. The ACO algorithm is motivated by the analogy with natural phenomena, in particular the ability of a colony of ants to ‘optimise’ their collective endeavours. In this paper, the computational implementation of ACO is presented in a structural design context. The objective function considered is the total weight/cost of the structure subjected to material and performance constraints in the form of stress and deflection limits. In the case of reticulated space trusses, the design variables are the cross-sectional areas of members belonging to various groups. The objective function and constraints are obtained by using structural analysis package FEAST (Anonymous, 1995. FEAST user manual. Trivandrum, India: SEG, SDS Group, ISRO, VSSC) in case of structures subjected to static loading and SAP90 (Anonymous, 1990. SAP90, ETABS, SAFE – computer software for structural and earthquake engineering. Berkeley, CA: Computers and Structures) for earthquake loading for reticulated steel space trusses. The numerical examples presented demonstrate the computational advantage of the ACO for large-scale optimisation problems.     

Heterogeneous households and firms in an urban model with open space and agglomeration economies*

This paper develops a model with heterogeneous households and firms that can locate anywhere in the city. The main features of the model are household preferences for open space which depend on distance to the greenbelts at the city periphery, and agglomeration economies for firms. Numerical results show equilibrium location patterns, rents, and wages under different model specifications. Under most conditions, monocentric location patterns (where there is a higher concentration of firms in the centre zones compared to surrounding zones) are observed, but duocentric location patterns for firms can emerge if both open space values and travel costs are high.     

Spatial and temporal analysis of urban flood risk assessment

Urban flood risk assessment requires quantification of uncertainty that is spatially and temporally variable. This paper presents a new approach to urban flood risk assessment by: (a) integrating objective and subjective uncertainties and (b) providing full insight into spatial and temporal change of flood risk. A 1-D storm sewer model and a 2-D surface flow model are integrated to describe the dynamic interactions between overland flow on the streets and flow through the storm sewer network. The fuzzy set theory approach is used to assess spatial and temporal variability of urban flood damage, and the acceptable level of partial flood damage. The spatial and temporal variability of fuzzy performance indices: (i) combined reliability-vulnerability; (ii) robustness and (iii) resiliency, are generated as the outcome of the urban flood risk analysis. The methodology is illustrated using the residential community of Cedar Hollow (London, Ontario, Canada) as a case study.     

单坡大跨度钢屋架考虑空间作用内力分析

结合抚顺特钢大棒材连轧生产线技术改造工程中的大跨度钢屋架设计,利用结构设计软件SAP2000建立有限元模型,对单榀钢屋架和考虑空间模型钢屋架的内力进行分析。计算结果表明,在相同荷载作用下,钢屋架按空间建模考虑空间作用进行内力分析时,其上弦杆和部分直腹杆的内力值有所减小,钢屋架设计用总钢量降低8.8%左右。分析结果可为同类型工程应用提供参考。     

上海中心室内空间生态人文景观设计优化探析

上海中心大厦作为中国第一高写字楼不仅可以体现“上海特色”,同时也是上海经济水平的象征。为使上海中心室内景观更大程度地体现生态人文特点。本文从该中心室内空间景观的深化重点、植物优化、小品减压、土壤配比、符合绿色三星标准、服务设施位置等几个方面对其任务理念进行了优化,研究上海中心大厦室内空闻生态景观设计的人文理念,同时提出了设计中需要解决的一些问题。     

主题性纪念馆设计方法探讨——以南王庄纪念馆为例

本文以南王庄纪念馆设计为例,从主题表达、地域文化表达、外部空间与场所建构、建筑功能与空间布局、建筑形态设计等方面探讨了主题性纪念馆设计的方法。     

作为空间叙事的方法——浅析坡道对于建筑连续空间的创造

本文以坡道的演变为主线,探讨其作为空间叙事的方法而产生的异于平常的空间体验,强调了以人为主体的运动体验的追求来决定着建筑空间的叙事模式。