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Development of Joint Which Enable to Make Strong and Ductile Timber Frame Structures.

开发能够制造坚固且延展性木框架结构的接头。

基本信息

批准号：
10556038
负责人：
KOMATSU Kohei
金额：
$ 8.06万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

In this study, we intended to develop strong and ductile joint methods which could connect axial members with each other for various wooden frame structures. At first, for the use of residential houses, a small lagascrewbolt (LSB) of 25 mm diameter and 120 mm long was applied for composing wooden diagonal system which did not cause spriting at sill member. Shear strength, stiffness and ductility of the diagonal system were evaluated by lateral shear test on shear wall specimens having 91 cm long and 273cm height. Test results showed that the newly developed diagonal system had same allowable strength for both push and pull loading, but also showed that about 10% smaller ultimate strength wen it was loaded by pull load.Next attentions were paid on the existing semi-rigid jointing techniques which could composed of joints with less steel wares, and their structural performance were evaluated by full-scale frame experiments. As our own original semi-rigid jointing method, we developed medium size LSBs of 30 mm diameter and 280 mm long, their pull-out strength and stiffness loaded performances were first evaluated on Douglus-fir GLT Test results showed that pull-out stiffness parallel to the grain was as higher as two to six times of those compared with perpendicular to the grain loading. While ultimate strength of side grain loading was stronger as two times of end grain loading. In any cases, strength and stiffness was proportional to the embedment area so allowable design values for LSB could be determined from these experiments. Finally, glulam semi-rigid portal frame specimens of 360 cm span and 270 cm height and their joints were all composed of LSB-joints were laterally loaded to evaluate shear performance of the frame structure. Test results showed that strength and stiffness were almost same as those predicted. In consequent, we think that structurally reasonable jointing methods were obtained which enable to built strong and ductile timber structures.

在本研究中，我们的目的是发展强大的和延性的连接方法，可以连接轴杆与其他各种木框架结构。最初，为了住宅的使用，使用直径为25 mm、长度为120 mm的小长螺旋螺栓（LSB）来构成木制对角系统，该对角系统不会在窗台构件处引起喷射。通过对长91 cm、高273 cm的剪力墙试件进行抗剪试验，评价了斜撑体系的抗剪强度、刚度和延性。试验结果表明，新开发的斜拉连接体系在拉、推荷载作用下具有相同的容许承载力，但在拉荷载作用下的极限承载力要低10%左右。作为我们自己独创的半刚性连接方法，我们开发了直径为30 mm、长为280 mm的中等尺寸LSB，首次在道格拉斯冷杉GLT上对其抗拔强度和刚度加载性能进行了评价。试验结果表明，平行于纹理加载的抗拔刚度比垂直于纹理加载的抗拔刚度高2 ~ 6倍。侧纹加载的极限强度比端纹加载的高一倍.在任何情况下，强度和刚度与埋置面积成比例，因此可以根据这些实验确定LSB的允许设计值。最后，对跨度为360 cm、高度为270 cm的胶合木半刚性门式刚架试件及其节点均为LSB节点进行了侧向加载试验，以评价框架结构的抗剪性能。试验结果表明，强度和刚度与预测值基本一致。因此，我们认为，结构合理的连接方法，使建立强大的和韧性的木结构。