预应力胶合木梁的受力性能和预应力损失研究

With the development of low-carbon building, large-span timer structures is one of the trends of building industry in China. Study of large-span timber structures is not only in accordance with the sustainable development policy, but promote the inheritance and innovation of Chinese traditional timber structures and its culture. In this project, the post tentioned unbonded prestressing technique will be introduced into glued laminated timber (glulam) structures, which have the advantage of large-span, material savings, high load bearing capacities, better deflection resistance performance and easy to process, etc. So the prestressed timber structure has a good prospect for large-span public buildings and bridges. The main work of this project are the prestressing losses and the mechanism behavior, which including the local mechanical performance under the anchorage and the global structural behaviou of the prestressed glulam beams. The stress mechanism and prestressing losses of the prestressed glulam beams, in which using steel bars or steel strands as prestressing materials, will be studied. And scientific calculation methods and appropriate structural measures of this type of prestressed members are brought forward. The following are summarizes of the main work of this project: 1) Experimental and analytical study of the load bearing capacity of wood at anchorage zone. 2) Experimental and analytical study of prestressing losses of the prestressed glulam beams. 3) Experimental study of the structural behavior of the prestressed glulam beams. 4) Stress analysis of the whole process and design methods of the prestressed glulam beams. Through the study, it will present a good reference for the research, design and engineering application of the prestressed timber structures.

在低碳建筑、节能减排背景下，大跨木结构是我国建筑业的发展方向之一。开展大跨木结构研究不仅符合我国可持续发展政策，也将促进我国传统木建筑文化的传承和创新。 本项目拟将成熟的后张无粘结预应力技术引入胶合木结构，其优点为大跨、节材、承载能力高、抵抗变形能力强、施工简便等，具有较好的应用前景。本项目主要针对预应力胶合木构件的受力性能（包括锚固区局部受力性能和构件整体受力性能）和预应力损失等科学问题展开系列研究。通过研究揭示其预应力损失及受力机理，探讨其破坏形态，提出科学计算方法和合理的构造措施。具体研究内容：1）锚固区锚下木材局部承载能力的试验研究和计算分析；2）预应力胶合木梁的预应力损失的试验研究和理论计算；3）预应力胶合木梁的结构性能试验研究；4）预应力胶合木梁的全过程受力分析与承载能力计算方法。 通过项目研究，为大跨预应力木结构的科研设计、推广应用奠定基础。

在低碳建筑、节能减排背景下，大跨木结构是我国建筑业的发展方向之一。开展大跨木结构研究不仅符合我国可持续发展政策，也将促进我国传统木建筑文化的传承和创新。.本项目将成熟的后张无粘结预应力技术引入胶合木结构，其优点为大跨、节材、承载能力高、抵抗变形能力强、施工简便等，具有较好的应用前景。本项目主要针对预应力胶合木构件的受力性能（包括锚固区局部受力性能和构件整体受力性能）和预应力损失等科学问题展开系列研究。通过研究揭示其预应力损失及受力机理，探讨其破坏形态，提出科学计算方法和合理的构造措施。具体研究内容：1）锚固区锚下木材局部承载能力的试验研究和计算分析；2）预应力胶合木梁的预应力损失的试验研究和理论计算；3）预应力胶合木梁的结构性能试验研究；4）预应力胶合木梁的全过程受力分析与承载能力计算方法。.项目研究开发了预应力锚固装置、界面连接节点、木梁体系等多项技术，并获得授权发明专利3项、实用新型专利多项；发表SCI论文3篇、中文核心期刊论文2篇；编制国家标准1部，已完成报批稿；创新性地提出了预应力木梁和组合梁的设计计算方法；培养博士研究生1名、培养硕士研究生8名，其中已毕业硕士研究生6名；体外预应力技术应用于国内最大木结构游泳馆—贵州榕江游泳馆项目；研究成果作为主要内容之一获江苏省科学技术奖一等奖。.通过项目研究，为大跨预应力木结构的科研设计、推广应用奠定基础。