Numerical evaluation of the impact performance of precast concrete segmental columns and strengthening techniques
Numerical evaluation of the impact performance of precast concrete segmental columns and strengthening techniques
复制标题
预制混凝土节段柱冲击性能数值评价及加固技术
DOI：
10.1016/j.engstruct.2021.112725
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发表时间：
2021-10
影响因子：
5.5
通讯作者：
Yifei Hao
中科院分区：
文献类型：
--
作者：
Shuyou Xue;Hong Hao;Yifei Hao
本文通过数值模拟研究了冲击位置对预制混凝土节段柱（PCSC）侧向冲击性能的影响，以及节点处设置消能（艾德）筋和碳纤维布（CFRP）加固技术对提高PCSC侧向冲击性能的有效性。低碳钢和形状记忆合金（SMA）用作艾德钢筋。文献中的试验结果验证了数值模型。在参数分析中考虑了不同的碰撞速度和碰撞位置。从有效塑性应变、变形和能量吸收等方面评价了不同强化工艺下PCSC的冲击性能。SMA艾德筋由于其超弹性的特性，对减小残余位移有较好的效果，而低碳钢艾德筋具有较好的能量吸收能力。PCSC的响应与撞击位置有关。当节点受到冲击时，柱段的转动更加明显，在节点处添加艾德筋和CFRP包裹可能无法有效地改善柱的性能，因为节段会发生严重的剪切变形。当一个节段受到冲击时，节段的平移滑移是主要的响应模式，所考虑的加固方法可以有效地减少PCSC相邻节段之间的滑移。此外，研究发现，预应力水平的提高可以降低预应力混凝土结构的变形响应，尤其是当节点处采用CFRP包裹时。在节点处包裹CFRP比艾德筋更能提高PCSC的抗冲击性能。
This paper numerically examines the influence of impact locations and the effectiveness of two strengthening techniques, i.e. energy dissipating (ED) bars and carbon fiber reinforced plastic (CFRP) wrapping at joints, on improving the performance of precast concrete segmental columns (PCSC) under lateral impacts. Mild steel and shape memory alloy (SMA) are used as ED bars. The numerical models are validated by test results available in literature. Different impact velocities and impact locations are considered in the parametric analysis. The impact performance of PCSC with different strengthening techniques is evaluated in terms of the effective plastic strain, deformation, and energy absorption. SMA ED bars are found more effective to reduce the residual displacement due to its super-elastic characteristic while the mild steel ED bars have better energy absorption ability. The response of PCSC is impact location dependent. When joint is impacted, segmental rotation is more pronounced, adding ED bars and CFRP wrapping at joints might not be effective to improve the column performance due to severe shear deformation of the segments. When a segment is impacted, the translational slippage of the segment is the primary response mode, the considered strengthening approaches can effectively reduce the slippage between adjacent segments of PCSC. Moreover, it is found that the deformation response of PCSC can be reduced by increasing the prestress force level, especially when CFRP wrapping is applied at segment joints. CFRP wrapping at joints is found outperforming ED bars on improving the impact resistance of PCSC.
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DOI：
--
发表时间：
2011
期刊：
Engineering mechanics
影响因子：
--
作者：
W. Zhiqiang
通讯作者：
W. Zhiqiang
影响因子：
5.1
作者：
A. Mutalib;H. Hao
通讯作者：
A. Mutalib;H. Hao
影响因子：
2.6
作者：
Chao Li;H. Hao;Xihong Zhang;K. Bi
通讯作者：
Chao Li;H. Hao;Xihong Zhang;K. Bi
影响因子：
3.7
作者：
C. Chung;Jungwhee Lee;Jong Ho Gil
通讯作者：
C. Chung;Jungwhee Lee;Jong Ho Gil
影响因子：
6.3
作者：
Jin, Liu;Chen, Huiming;Du, Xiuli
通讯作者：
Du, Xiuli