| 摘要: |
| 为探究部分包裹混凝土（PEC）柱在膨胀剂作用下的黏结滑移性能，设计了6组试件进行短柱推出试验，探究了混凝土强度、黏结长度和膨胀剂掺量对H形钢与混凝土之间黏结性能的影响，分析了黏结应力的组成，建立了反映黏结滑移性能的数值模型.结果表明：H形钢和混凝土之间的黏结性能与混凝土强度、黏结长度以及膨胀剂掺量呈正相关；H形钢与混凝土之间黏结应力的81.6%由摩擦应力提供，考虑黏结长度的摩擦应力与化学胶结力的比值稳定在42%~47%；依据试验建立的折线式黏结滑移本构模型可以较好地反映黏结应力与位移的关系，采用非线性弹簧建立的有限元模型与试验结果吻合较好. |
| 关键词: 组合结构 黏结应力 本构模型 膨胀剂 |
| DOI：10.3969/j.issn.1007-9629.2022.11.010 |
| 分类号:TU398 |
| 基金项目:国家自然科学基金资助项目（51868061）；内蒙古自治区自然科学基金资助项目（2020MS05071， 2022LHMS05011） |
|
| Bond Slip Performance of PEC Column Considering Expansion Agent |
|
CAO Fubo1,2, XIE Qing1, LI Tao3, WANG Fangying4, WANG Chenxia1,2
|
|
1.School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China;2.Intelligent Construction and Operation Engineering Research Center at Universities of Inner Mongolia Autonomous Region, Baotou 014010 , China;3.Zhonghengfeng Construction Group Co., Ltd., Beijing 102627, China;4.Department of Civil Engineering, University of Nottingham, Nottingham NG72RD, UK
|
| Abstract: |
| Work on the bond-slip performance of partially encased concrete （PEC） under the action of expansion agent was carried out. Six groups of specimens were designed to carry out short column push-out test. The effects of concrete strength， bond length and expansion agent content on the interface bonding performance between H-shaped steel and concrete were investigated. The composition of bond stress was analyzed， and the numerical model reflecting the bond-slip performance was established. The results show that the improvement of bonding performance is positively correlated with concrete strength， bonding length and expansion agent content. 81.6% of the bond stress between H-shaped steel and concrete is provided by friction stress， and the ratio of friction stress to chemical bond force considering bond length is stable at 42%-47%. The broken-line bond-slip constitutive model established according to the test can better reflect the relationship between bond stress and displacement. The finite element model established by nonlinear spring is well fitted with the test results. |
| Key words: composite structure bond stress constitutive model expansion agent |
