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

木工字梁是住宅地板建筑中的主要产品，在北美约60%的新地板建筑中使用。需要进一步研究，以扩大该产品在非住宅建筑和高层建筑中的应用。拟议的研究计划将建立在早期的研究成果，在新玩法大学的木工字梁。拟议的研究计划的总体目标，其中包括4个论文项目，是开发技术工具和建筑系统，将允许木工字梁用于非住宅和高层建筑应用。为了实现这一总体目标，需要解决产品限制其承载能力的特征。为此，四个项目中的两个将研究产品在支撑点和腹板开口时的承载强度，而其余两个将研究包括木质I形托梁的结构子系统的性能。项目1将开发一种分析方法来预测腹板开口的木质I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旨在开发一种方法来提高木工字梁的承载强度。它将研究使用机械紧固件来提高轴承强度，这可能是非住宅应用中的关键设计因素。项目3将研究深木工字梁在多层建筑物大跨度楼板中的应用。特别感兴趣的是与这些深木工字梁建造的地板系统的隔膜作用，以及它如何影响性能的中层木框架建筑物时，受到地震和风事件所产生的横向载荷。项目4将研究一种创新的复合地板系统的性能，该系统由木工字梁和交叉层压木材（CLT）板组成。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。

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.