Development of Wooden High Quality Frame Structures Easy to Built-Up, Re-Structure and Re-Use

在这个研究项目中，我们打算利用日本传统木结构的特点，提出一种新型的木柱梁结构，可以控制其刚度、强度和延性。这一政策并不意味着避免任何现代的木材连接方法，相反，我们积极地打算使用拉力螺丝连接或/和螺栓连接，这种连接具有容易紧固和容易取下的优点。对带拉力的木材-木材节点进行了一系列试验。提出了多根拉力螺栓节点的强度折减系数和木材-木材拉力螺栓节点的许用设计荷载。木材-木材螺栓连接也被作为其设计方法，其刚度和强度还没有明确的确定。利用弹性地基梁理论，提出了一种新的计算木材-木材螺栓连接节点刚度和强度的设计方法。此外，还给出了木材弯矩分析的设计公式…目前正在提出更多的刺痛关节。此外，我们将我们的研究扩展到硬木楔子在Nuki(窄梁)关节固定中的作用。通过一系列的实验工作，验证了本文提出的优化楔入深度的方案是合理的，并利用新建立的力学模型对最简单的Nuki接头的基本传力机理进行了模拟。最后，我们利用螺栓和硬木楔板开发了一种新型的木柱梁结构。在第一阶段，仅将框架结构评估为半刚性门式刚架。在下一阶段，加入了预制的小型MAD剪力墙来制作实际的木结构，并通过足尺水平加载试验对剪力墙的抗侧性能进行了评估。因此，我们可以在不损失现代结构形式的方便性的情况下，借鉴我国传统木结构的思想，在一定程度上建立起几种基本的木柱梁结构形式。较少

In this research project, we intended to propose new types of timber post & beam structure that can control its stiffness, strength and ductility by making use of characteristics involved in Japanese traditional timber structures. This policy does not mean to avoid any modern timber jointing methods but inversely we intend positively to use lag screwed joints or/and bolted joints which have advantages of easy to fasten and easy to taken off. A series of experiments was performed on lag screwed timber-to-timber joints. Strength reduction factor for multiple lag screwed joints and permissible design load of timber-to-timber lag screwed joints were proposed. Timber-to-timber bolted joints were also taken as its design method for stiffness and strength were not established clearly yet. We proposed a new design method for estimating stiffness and strength of bolted timber-to-timber joints using the theory of beam on elastic foundation. Also, design equations for timber-to-timber moment resi … More sting joints are being proposed at present. Further, we extended our research into investigation on the role of hard wood wedges for fixation of Nuki (Narrow-beam) joints. Through a series of experimental works, our proposal for optimized wedge penetration depth was verified to be reasonable and further basic load transferring mechanism of the simplest Nuki-joint was simulated using newly developed mechanical model. Finally, we developed a new type of timber post & beam structures by utilizing bolts and hard wood timber wedges. In the first stage, only frame structures were evaluated as the semi-rigid portal frame. In the next stage, small pre-fabricated mad shear walls were added for making actual timber structure and the lateral performance of shear walls was evaluated by full-scale lateral loading tests. In consequently, we could establish in some extent a few basic forms of timber post & beam structures by making use of ideas involved in our traditional timber structures without loosing convenience in modem structural forms. Less