Resolution of Collapse Mechanism of Timber Space Frames Subjected to Excessive Snow Load and Practical Formulation to Predict their Critical Performance.

过量雪荷载作用下木空间框架倒塌机制的解析及预测其关键性能的实用公式。

• 批准号: 11555156
• 负责人: SUZUKI Tamotsu
• 金额: $ 3.78万
• 依托单位: Institute of Wood Technology, Akita Prefectural University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555156/
• 关键词: Wooden House; Conventional Timber Construction; Resisting Mechanism to Snow Load; Loading Experiment; Collapse Performance; Response Analysis; Snow Load; Buckling Load; 木造建物; 在来軸組工法; 載荷実験

1. Based on the survey of damages of wooden buildings in past seasons of heavy snow, it was found that the total collapse of such buildings occurred when they were made of decrepit timber-frames and also when they suffered excessive snow load. In addition, answers to questionnaires in this study showed that the recent change in our lifestyles was liable to result to excessive snow loads to our houses due to the lack of human power, equipments, and wisdoms for the removal of snow from the roofs.2. An equation to predict the buckling load of columns in houses was formulated through the data analysis of various buckling tests of Japanese cedar simple columns with tenon joints. The buckling load can be estimated by the Euler equation for slender columns with simple supports and by the modified Johnson equation for large ones.3. For the typical frame models of wooden houses in snowy regions, the parametric analytical study to examine the effects of wall volume and their arrangements on the buckling loads or their relevant collapse modes showed that the condition that causes their total collapse was restricted to some bare-like skeletons such as those with little bearing walls or with almost decrepit ones.4. The vertical loading test of a typical Japanese-style roof truss and its relevant finite element analysis clarified that the roof truss will collapse either by the bending break of its beam or by the tensile break of a joint of the beam.5. Finally, the principle and the framework to predict the ultimate capability of timber frame houses subjected to an excessive roof snow load are proposed by summing up the above important results.

1.通过对历年大雪季节木结构房屋破坏情况的调查，发现木结构房屋的整体倒塌主要是由于木结构的老化和雪荷载过大造成的。此外，调查问卷的结果显示，由于人们生活方式的改变，人们的房屋因缺乏人力、设备和清扫屋顶积雪的智慧而容易承受过大的积雪负荷。通过对日本雪松榫节点简支柱各种屈曲试验数据的分析，建立了预测房屋柱屈曲荷载的公式。对于简支细长柱，屈曲荷载可用欧拉方程估算;对于大柱，屈曲荷载可用修正的约翰逊方程估算.针对典型的雪区木结构房屋框架模型，通过参数分析研究了墙体体积及其布置方式对屈曲荷载及相应倒塌模式的影响，结果表明，导致其完全倒塌的条件仅限于承重墙少或墙体几乎老化的裸露骨架.通过对一典型日式屋架的竖向荷载试验及有限元分析，阐明了屋架的破坏形式既可能是梁的弯曲断裂，也可能是梁节点的拉伸断裂.最后，在总结上述研究成果的基础上，提出了预测木结构房屋在屋顶积雪荷载作用下极限承载力的原则和框架。

项目成果

Hou, B., Ishikawa, K., Hata,M., Suzuki. T., Goto, M., Maeda. H., et al.: "Buckling Mode and Buckling Load of Wooden Space Frames due to Vertical Load-Part 1: Analysis Method and Buckling Behavior of Analysis Model"Summaries, Technical Papers of Annual Mee

Hou，B.，石川，K.，Hata，M.，铃木。

鈴木有,若島嘉朗,飯島泰男: "実大木質実大住宅の耐震性能検証実験(6)(7)"第50回日本木材学会大会研究発表要旨集. 229-230 (2000)

Yu Suzuki，Yoshiro Wakashima，Yasuo Iijima：“全尺寸木结构房屋的抗震性能验证实验（6）（7）”第50届日本木材学会会议研究报告摘要集229-230（2000）。

侯炳金,石川浩一郎,秦正徳,鈴木有,後藤正美,前田博司: "鉛直荷重を受ける木造立体架構の座屈性状に及ぼす壁量とねじり剛性の影響"日本建築学会学術講演梗概集. Vol.C-1. 293-294 (2000)

侯丙金、石川晃一郎、畑正则、铃木佑、后藤雅美、前田宏：《墙体体积和扭转刚度对垂直荷载作用下木质三维结构屈曲性能的影响》建筑学院学术讲座论文集日本，C.-1。

西尾大, 石川浩一郎, 秦正徳, 鈴木有, 後藤正美, 前田博司: "鉛直荷重を受ける木造立体架構の座屈荷重と座屈モード(その2)壁量と壁配置の影響"日本建築学会大会(関東)学術講演梗概集. 構造III. 67-68 (2001)

Dai Nishio、Koichiro Ishikawa、Masanori Hata、Yu Suzuki、Masami Goto、Hiroshi Maeda：“垂直荷载作用下的木质三维框架的屈曲荷载和屈曲模式（第 2 部分）墙体数量和墙体布置的影响”日本建筑研究所日本会议（关东）学术讲座摘要 III 67-68（2001）。

秦正徳,中谷浩: "多雪地域の鉛直荷重と実大柱の座屈耐力について(1)(2)"第50回日本木材学会大会発表要旨集. 234-235 (2000)

Masanori Hata、Hiroshi Nakatani：“关于大雪地区真实大柱的垂直载荷和屈曲强度（1）（2）”日本木材协会第 50 届年会 234-235（2000 年）上发表的摘要集。 ）