Enhancing the structural performance of wood I-joists and system behaviour of structures containing wood I-joists

增强木质工字托梁的结构性能和包含木质工字托梁的结构的系统行为

• 批准号: 109473-2011
• 负责人: Chui, YingHei
• 金额: $ 1.53万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=509017
• 关键词: Enhancing; structural; performance; wood; joists

Wood I-joists are a dominant product in residential floor construction and are used in about 60% of new floor construction in North America. Further research is required to expand the application of the product to non-residential construction and in tall buildings. The proposed research program will build on earlier research achievements at the University of New Brunswick on wood I-joists. The overall goal of the proposed research program, which consists of 4 thesis projects, is to develop technical tools and building systems that will allow wood I-joists to be used in non-residential and tall building applications. For this overall goal to be fulfilled there is a need to address the features of the product that limit its load-carrying capacity. To this end two of the four projects will investigate the strengths of the product in bearing at support points and when a web opening is present, whereas the remaining two will investigate the performance of structural sub-systems comprising wood I-joists. Project 1 will develop an analytical approach to predict the load-carrying capacity of wood I-joist with a web opening. The innovation of this approach is its ability to account for the influence of bending moment and can be simplified to be used for design purpose. Project 2 is aimed at developing a method to improve the bearing strength of wood I-joists. It will investigate the use of mechanical fasteners to improve bearing strength, which may be the critical design factor in non-residential applications. Project 3 will study the application of deep wood I-joists in long span floor applications in multi-storey buildings. Of specific interest is the diaphragm action of floor systems built with these deep wood I-joists, and how it affects the performance of mid-rise wood frame buildings when subjected to lateral loads arising from seismic and wind events. Project 4 will investigate the performance of an innovative composite floor system consisting of wood I-joists and cross laminated timber (CLT) plate. The proposed research will complement the research activities of a 5-year NSERC Strategic Network on Innovative Wood Products and Building Systems which is led by the applicant.

木质工字形托梁是住宅地板建筑中的主导产品，在北美约60%的新地板建筑中使用木工字梁。要扩大该产品在非住宅建筑和高层建筑中的应用，还需要进一步的研究。拟议的研究计划将建立在新不伦瑞克大学早先关于木工字梁的研究成果的基础上。这项拟议的研究计划由4个论文项目组成，其总体目标是开发技术工具和建筑系统，使木质工字梁能够用于非住宅和高层建筑应用。为了实现这一总体目标，需要解决限制其承载能力的产品特征。为此，四个项目中的两个将调查产品在支撑点和腹板开口时的轴承强度，而其余两个项目将调查由木工字梁组成的结构子系统的性能。项目1将开发一种分析方法来预测带腹板开口的木工字形托梁的承载能力。这种方法的创新之处在于它能够考虑弯矩的影响，并且可以简化以用于设计目的。项目2旨在开发一种提高木工字形托梁承载强度的方法。它将研究使用机械紧固件来提高承载强度，这可能是非住宅应用中的关键设计因素。项目3将研究深木工字形托梁在多层建筑大跨度楼板中的应用。特别令人感兴趣的是用这些深木工字形托梁建造的楼板系统的横隔板作用，以及当受到地震和风事件产生的横向荷载时，它如何影响中层木结构建筑的性能。项目4将研究由木工字梁和交叉叠层木材(CLT)板组成的创新复合地板系统的性能。这项拟议的研究将补充由申请人领导的为期5年的NSERC创新木制品和建筑系统战略网络的研究活动。