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，提出一种可以控制其刚度、强度和延性的新型木柱梁结构。这一政策并不意味着要避免任何现代木材连接方法，相反，我们打算积极使用具有易于紧固和易于拆卸的优点的滞后螺钉连接或/和螺栓连接。对木-木连接节点进行了一系列试验研究。提出了多螺纹连接的强度折减系数和木对木螺纹连接的允许设计荷载。其刚度和强度设计方法也采用木与木之间的螺栓连接。基于弹性基础梁理论，提出了一种估算木-木螺栓连接刚度和强度的新设计方法。此外，还建立了木间弯矩的设计方程。此外，我们扩展了我们的研究，以调查硬木楔固定Nuki（窄梁）关节的作用。通过一系列的试验工作，验证了本文提出的楔入深度优化方案的合理性，并利用新建立的力学模型进一步模拟了最简单的nuki节点的基本载荷传递机理。最后，我们开发了一种利用螺栓和硬木木楔的新型木柱梁结构。在第一阶段，只有框架结构被评估为半刚性门式刚架。下一阶段，加入小型预制疯狂剪力墙制作实际木结构，并通过全尺寸横向荷载试验评估剪力墙的侧向性能。因此，我们可以利用我国传统木结构的思想，在一定程度上建立几种基本的木柱梁结构形式，同时又不失现代结构形式的便捷性。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