| 陆志秀,薛之军,种正江.基础内预埋锚杆抗拔试验研究[J].水泥工程,2018,31(6):77-79 |
| 基础内预埋锚杆抗拔试验研究 |
| Study on pull-out test of pre-embedded anchors in foundation |
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| DOI： |
| 中文关键词: 预埋锚杆 抗拔试验 塑性破坏 |
| 英文关键词: Embedded anchor pull-out test plastic failure |
| 基金项目: |
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| 摘要点击次数: 1169 |
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| 中文摘要: |
| 通过对建筑基础筏板内预埋锚杆进行抗拔试验检测其抗拔承载性能，对锚杆周围混凝土受抗拔力破坏形式进行研究。研究表明：在埋入锚杆最底端加拧1个螺母，起扩大头作用，增大锚杆侧阻力，较好地固定锚杆，抗拔试验破坏时，断裂部位发生在千斤顶施加荷载作用点附近，而并非将锚杆整体拔出；加载至锚杆材料屈服破坏点对应荷载739 kN附近，荷载-位移曲线呈线性变化，加载量大于该值后，锚杆塑性变形逐渐发展，抗拔过程主要是锚杆杆体自身形变的过程，前半阶段主要为弹性变形，后半阶段主要为塑性变形，直至锚杆被拉断；从筏板内锚杆取芯样来看，抗拔对锚杆周边混凝土产生一定拉裂，裂缝不大，主要在上部300 mm处。 |
| 英文摘要: |
| Embed anchors into the raft foundation of buildings. Test the uplift bearing capacity of the embedded anchors through the pull-out test, and study the damage type of the concrete around the anchors under the pulling force. The research demonstrates: add a nut at the bottom of the embedded anchor to enlarge the head and the lateral resistance of the anchor, and thus the anchor can be well fixed. During the pull-out test, the fracture position is near the point of action where the jack imposes load instead of pulling the entire anchor out; when the load is imposed to near 739kN, a load the yield failure point of the anchor material corresponds to, the load-displacement curve presents a linear change; when the loading force exceeds the value, the plastic deformation of the anchor gradually develops; the pull-out process is mainly the deformation process of the anchor rod itself: it is elastic deformation mainly in the first half of the stage while it is plastic deformation in the later stage till the anchor breaks; from the core samples of the anchor in the raft, it can be seen that the pulling force breaks the concrete around the anchor to some extent, but the cracks are not severe, mainly distributing at the place which is 300mm from the upside. |
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