Stress Transfer between Steel Tubular Column and Infill Concrete at A Connection of H-Beams to Concrete Filled Tubular Columns with Diagonal Braces

H 型钢与斜撑填充管柱连接处钢管柱与填充混凝土之间的应力传递

• 批准号: 15560493
• 负责人: KAWANO Akihiko
• 金额: $ 1.98万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560493/
• 关键词: bond; mechanical shear connector; outside diaphragm connection; cut-through diaphragm connection; diagonal brace; confining effect; コンクリート充填鋼管; 筋違付き骨組; 機械的滑り止め; 通しダイヤフラム; 押し抜き試験; bond; mechanical shear connector; outside diaphragm connection; cut-through diaphragm connection; diagonal brace; confining effect; コンクリート充填鋼管; 筋違付き骨組; 機械的滑り止め; 通しダイヤフラム; 押し抜き試験

In 2003,we performed a push-out test of concrete-filled tubular stub columns to investigate the bond strength between tubular columns and infill concrete and the mechanical shear connector effect due to the cut-through diaphragm for beam-to-column connections. In 2004,frame models composed of a concrete-filled tubular column, H-shape beam and diagonal brace are tested to ensure the realistic bond strength and the effect of mechanical shear connectors in building frames.From the tests, the following conclusive remarks were introduced :(1)The conventional knowledge about the bond strength of concrete-filled tubes were traced by the stab column test. That is the bond strength is affected by tubular section shapes (circular or rectangular hollow section) strongly, but not so much by the concrete strength.(2)The effect of mechanical shear connector caused by the cut-through diaphragm can be predicted by the lower strength either the bearing strength between infill concrete and diaphragm in … More a tube or the shear yield strength of a diaphragm plate even with a large safety margin. In fact, the bearing strength dominated the strength prediction. In such a case, the concrete confining effect should be considered, so that the large safety margin is introduced by the confining effect.(3)In case of frame models with outside diaphragm stiffened connections, the stress transfers from a steel tube to concrete by the bond action. The bond strength observed in the frame models is almost similar to the one obtained from push-out test of concrete-filled tubular stub columns, where only concrete section is subjected to compressive load at the top and only steel tubular potion is supported at the bottom. The bond strength from another test where both of concrete and steel tube are subjected to compressive load at the top will give too much underestimation for the strength obtained from the frame model.(4)In case of frame models with cut-through diaphragm connections, the mechanical shear connector effect can be expected for stress transfer from steel tube to concrete. Even though all of the frame models were designed to have the diaphragm with very large hole for concrete casting, the exposed concrete portion at the column base crushed by the it own axial compressive stress which must be transferred from the steel tube. Therefore, in general, the mechanical shear connecting effect by cut-through diaphragm connections may be large enough for the practical use. Less

在2003年，我们对填充混凝土的管状固管柱进行了推出测试，以研究块茎柱和填充混凝土之间的键强度以及机械剪切连接器效应，这是由于横梁到柱连接的切割diaphragragm。在2004年，测试了由充满混凝土填充的管状柱，H形束和对角线支撑组成的框架模型，以确保逼真的粘结强度和机械剪切连接器在构建框架中的效果。从测试中，引入了以下最终提醒：（1）引入有关刺激柱的常规知识，该知识是关于刺激列的常规知识。 That is the bond strength is affected by tuber shapes (circular or rectangular hollow section) strongly, but not so much by the concrete strength.(2)The effect of mechanical shear connector caused by the cut-through diaphragm can be predicted by the lower strength either the bearing strength between infill concrete and diaphragm in … More a tube or the shear yield strength of a diaphragm plate even with a large safety margin.实际上，轴承强度主导了强度预测。在这种情况下，应考虑混凝土限制效应，以便通过限制效应引入较大的安全边缘。（3）如果框架模型具有外部隔膜加强连接的框架模型，则应力通过键作用将钢管从钢管转移到混凝土。在框架模型中观察到的键强​​度几乎与从混凝土填充管柱的推出测试获得的键强度相似，在该测试中，只有混凝土截面在顶部承受压缩载荷，底部仅支撑钢管。另一个测试的键强度在顶部都承受压缩载荷，从而使从框架模型获得的强度进行太多低估。（4）如果具有切割直发diaphragm连接的框架模型，机械剪切连接器的效果可能会导致从钢管转移到混凝土。即使所有的框架模型都设计为具有非常大的孔具有用于混凝土铸造的隔膜，但圆柱底座处的裸露混凝土部分被IT自身轴向压力压碎，必须从钢管中转移。因此，通常，通过切割隔膜连接的机械剪切连接效果可能足够大以进行实际使用。较少的