The Singapore buildable design appraisal system: a preliminary review of the relationship between buildability,site productivity and cost.

This paper presents preliminary findings of a study to examine the relationship between site productivity, construction costs and the ‘buildable score’ of a buildable design appraisal system recently developed by the Singapore Construction Industry Development Board. The buildable score for a building is a numerical figure computed by taking into account the level of standardization, simplicity and extent of integrated elements used in the design of a building. The stated objective of the appraisal system is ‘to promote more buildable designs in the industry through assessing the contribution of design to site efficiency and produc6 tivity’. Empirical results from 37 completed building projects provide support for the appraisal system's proposition that ‘a design with a higher buildable score will result in more efficient labour usage in construction and therefore higher site labour productivity’. However, the relationship between construction costs and buildable score is less distinct.     

全球流动背景下技术改进与选择案例研究——抗战后方“战时建筑”设计混合策略初探

发明与传播是全球流动背景下技术研发与输出的主要形式,而后发地区建筑活动的技术策略也并非仅限于被动接受输入之一途。本研究聚焦抗战时期中国后方"战时建筑"及其"简易建筑技术",侧重于重庆地区,特别关注建筑结构设计,梳理并描述"战时建筑"普遍采用的材料、结构、构造和施工技术概况。进而,以国立女子师范学院和国立中央大学柏溪分校两所高校建筑为重点展开案例研究,基于原始设计图纸与档案的查阅和针对性的田野调查,采用结构力学分析结合剖面(空间)设计分析这一跨学科研究方法,揭示其设计采取混合策略的意图正在于寻求空间合用性、结构合理性与易建性诉求的综合平衡,是一种基于设计思维转变的建筑技术进步。它不仅表征了一种认知进展的萌发,而且还投射出技术改进与选择的历史逻辑与机制:在抗战后方特定时空条件下,中国建筑师开始意识到中西木构技术其实各有长短的真相,由此尝试跳脱再现模式,针对"中国问题",基于效率考量,开拓新的设计思路。     

Improving building project performance: how buildability benchmarking can help

Although the buildability of building designs has not been commonly taken as an important parameter in design quality assessment, previous studies have linked buildability to time, cost, quality and safety performance in many ways. Based on this observation, the question arises of how buildability can be benchmarked and which aspects of project performance can be improved. After identifying available benchmarking tools, the relative correlations are investigated between different buildability attributes and construction performance in terms of time, cost, quality and safety. Based on a questionnaire survey, it was found that construction time performance has strong positive correlations with buildability in the design of external wall elements, simplicity of assembly and installation considerations, while other design attributes affect cost, quality and safety performance to varying degrees. With this understanding, it is postulated that best practice can be promoted among design teams for enhancing buildability, which would in turn raise project performance. Three experienced practitioners have been interviewed for verifying the practicality of buildability benchmarking. As an incentive to improve buildability, benchmarking would help construction stakeholders reap their desired benefits by focusing on the related design attributes in the pre‐construction stage, particularly for functionally oriented buildings.     

3D打印水泥基材料的建造性研究

通过塑性强度、静态屈服应力和跳桌流动度的经时变化试验,研究了纳米黏土与减水剂协同作用对3D打印水泥基材料(3DPC)建造性的影响,并以流变性能为参考依据,建立了3DPC建造性的评价指标。结果表明,复掺纳米黏土和增黏型聚羧酸减水剂的3DPC经时塑性强度和经时静态屈服应力均随纳米黏土掺量增加而提高,纳米黏土的适宜掺量为0.8%;当静态屈服应力时变速率为2.0~4.2 Pa/s时,可实现3DPC的挤出性与建造性的协同;在可打印、可建造窗口时间内,3DPC的跳桌流动度为170~190 mm。掺用纳米黏土和增黏型聚羧酸减水剂对3DPC的流变参数进行调控是提高3DPC建造性的有效途径。     

Constructability implementation: a survey in the Malaysian construction industry

Twenty-three constructability concepts are identified. Based on these, an industry-wide questionnaire was administrated in Peninsular Malaysia. The respondents were the engineers working with owners, consultants, contractors, subcontractors and construction management firms. The importance, from the viewpoint of the Malaysian engineers, of the constructability concepts and the degree of the actual application of those concepts in the Malaysian Construction Industry is presented so that an insight on constructability implementation can be established. Fieldwork results revealed that the Malaysian engineers showed high acceptance of 22 concepts and rejected the one that relates to the fast-track method of construction. Those engineers accepted the constructability concepts from the theoretical point of view but generally they did not apply these concepts in their practices. The study also concludes that the Malaysian engineers show a wide understanding of the majority of the concepts. However, they did not link those concepts under the umbrella of constructability.