火灾作用后钢管混凝土构件侧向撞击性能研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (4) : 179-187.

论文

纪孙航，史艳莉，王文达

作者信息 +

Lateral impact performance of concrete-filled steel tubular (CFST) members after fire

JI Sunhang,SHI Yanli,WANG Wenda

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文章历史 +

摘要

建立火灾作用后钢管混凝土构件的侧向撞击数值模型以分析构件的抗撞击性能，并对模型的准确性进行了验证。分别对比了不同受火时间后构件的跨中挠度、撞击力和截面弯矩时程曲线，分析了受火后构件的弯矩和剪力分布形态。通过吸能系数和火灾后动态弯矩提高系数对受火后构件的抗撞击性能进行量化分析，并给出构件跨中最大挠度的计算公式。结果表明，受火时间对构件的跨中挠度、撞击时程、撞击力和截面弯矩影响明显。随着受火时间增加，构件的跨中挠度大幅增加，撞击时程变长，且外钢管与混凝土各自承担的动态极限弯矩之比增大。惯性力对构件弯矩和剪力分布的影响主要在峰值阶段，该阶段弯矩和剪力的分布形态明显改变。受火后构件的破坏形式为整体弯曲变形，构件主要通过整体变形耗散落锤的动能。此外，构件的撞击力平台值、截面动态极限弯矩、吸能系数和火灾后动态弯矩提高系数均随着受火时间增加而降低，表明构件抗撞击性能和抗弯能力降低，公式计算的最大挠度与模拟结果吻合良好。

Abstract

The finite element analysis (FEA) model of post-fire concrete-filled steel tube (CFST) members under lateral impact was built to analyze the lateral impact performance of the member after fire, and the accuracy of the model was verified.The time history curves of mid-span deflection, impact force and sectional moment on the post-fire CFST members were compared respectively.The distribution of the moment and shear force of the member was analyzed.The energy absorption capacity (μ) and the post-fire dynamic increase factor of flexural capacity (RT) were used to analyze the impact resistance of the member quantitatively.The formula for predicting the maximum mid-span deflection of the member was proposed.The results show that the fire time has a significant effect on the mid-span deflection, impact duration, impact force and sectional moment of the member.With the increase of fire time, the mid-span deflection greatly increases, the impact duration becomes longer, and the ratio of the ultimate dynamic moment of the steel tube to the concrete increases.The influence of inertia force on the distribution of the moment and shear force is obvious at the peak stage, and the distribution at this stage changes significantly.The failure mode of the member is the overall bending deformation, and the kinetic energy of the drop hammer is mainly dissipated by the overall deformation.The plateau value of impact force, the ultimate sectional dynamic moment, the μ and the RT of the member gradually decrease with the increase of the fire time, indicating that the impact resistance and bending capacity of the member decrease.The maximum deflections calculated by the formula are in good agreement with the simulated values.

导出引用

纪孙航，史艳莉，王文达. 火灾作用后钢管混凝土构件侧向撞击性能研究[J]. 振动与冲击, 2021, 40(4): 179-187

JI Sunhang,SHI Yanli,WANG Wenda. Lateral impact performance of concrete-filled steel tubular (CFST) members after fire[J]. Journal of Vibration and Shock, 2021, 40(4): 179-187

参考文献

[1] Han L H, Li W, Bjorhovde R. Developments and advanced applications of concrete-filled steel tubular (CFST) structures: Members [J]. Journal of Constructional Steel Research, 2014, 100: 211–228.
[2] 韩林海．钢管混凝土结构—理论与实践(第三版)[M]．北京：科学出版社，2016．
HAN Linhai. Concrete filled steel tubular structures: theory and practice [M]. 3nd ed. Beijing: Science Press, 2016.
[3] Wang R, Han L H, Hou C C. Behaviour of concrete filled steel tubular (CFST) members under lateral impact: experiment and FEA model [J]. Journal of Constructional Steel Research, 2013, 80: 188–201.
[4] Han L H, Hou C C, Zhao X L, et al. Behaviour of high-strength concrete filled steel tubes under transverse impact loading [J]. Journal of Constructional Steel Research, 2014, 92: 25–39.
[5] 王蕊，李珠，任够平，等．钢管混凝土梁在侧向撞击荷载作用下动力响应的试验研究和数值模拟[J]．土木工程学报，2007，40(10)：34–39．
WANG Rui, LI Zhu, REN Gouping, et al. Experimental study and numerical simulation of the dynamic response of concrete filled steel tubes under lateral impact load [J]. China Civil Engineering Journal, 2007, 40(10): 34–39.
[6] Wang R, Han L H, Tao Z. Behavior of FRP-concrete-steel double skin tubular members under lateral impact: experimental study [J]. Thin-Walled Structures, 2015, 95: 363–373.
[7] Wang R, Han L H, Zhao X L. Analytical behavior of concrete filled double steel tubular (CFDST) members under lateral impact [J]. Thin-Walled Structures, 2016, 101: 129–140.
[8] 史艳莉，鲜威，王蕊，等．方套圆中空夹层钢管混凝土组合构件横向撞击试验研究[J]．土木工程学报，2019，52(12): 11-21.
SHI Yanli, XIAN Wei, WANG Rui, et al. Experimental study of circular-in-square concrete filled double-skin steel tubular (CFDST) composite components under lateral impact [J]. China Civil Engineering Journal, 2019, 52(12)： 11-21.
[9] 史艳莉，何佳星，王文达，等．内配圆钢管的圆钢管混凝土构件耐撞性能分析[J]．振动与冲击，2019，38(9)：123-132．
SHI Yanli, HE Jiaxing, WANG Wenda, et al. Anti-impact performance analysis for circular CFST members with inner circular steel tube [J]. Journal of Vibration and Shock, 2019, 38(9): 123–132.
[10] Zhao H, Wang R, Hou C C, et al. Performance of circular CFDST members with external stainless steel tube under transverse impact loading [J]. Thin-Walled Structures, 2019, 145: 106380.
[11] Yousuf M, Uy B, Tao Z, et al. Transverse impact resistance of hollow and concrete filled stainless steel columns [J]. Journal of Constructional Steel Research, 2013, 82: 177–189.
[12] Han L H, Yang Y F, Yang H, et al. Residual strength of concrete-filled RHS columns after exposure to the ISO-834 standard fire [J]. Thin-Walled Structures, 2002, 40: 991–1012.
[13] Han L H, Huo J S. Concrete-filled hollow structural steel columns after exposure to ISO-834 fire standard [J]. Journal of Structural Engineering, 2003, 129(1): 68–78.
[14] 林晓康，韩林海．火灾作用后圆钢管混凝土柱荷载-位移滞回性能研究[J]．建筑结构学报，2005，26(3)：19–29.
LIN Xiaokang, HAN Linhai. Load-displacement hysteretic behavior of concrete filled CHS columns after exposure to ISO-834 standard fire [J]. Journal of Building Structures, 2005, 26(3): 19–29.
[15] Li W, Wang T, Han L H. Seismic performance of concrete-filled double-skin steel tubes after exposure to fire: experiments [J]. Journal of Constructional Steel Research, 2019, 154: 209–223.
[16] 任晓虎，霍静思，陈柏生．高温后钢管混凝土短柱落锤动态冲击试验研究[J]．振动与冲击，2011，3(11)：67–84．
REN Xiaohu, HUO Jingsi, CHEN Baisheng. Dynamic behaviors of concrete-filled steel tubular stub columns after exposure to high temperature [J]. Journal of Vibration and Shock, 2011, 3(11): 67–84.
[17] 李文亮．侧向冲击钢管混凝土构件的试验研究和仿真数值分析[D]. 太原：太原理工大学，2007.
LI Wenliang. Experimental research and emulation numerical analysis on steel tube-confined concrete under lateral impact [D]. Taiyuan: Taiyuan University of Technology, 2007.
[18] Wang Y, Qian X D, Liew J R Y, et al. Experimental behavior of cement filled pipe-in-pipe composite structures under transverse impact [J]. International Journal of Impact Engineering, 2014, 72:1–16.
[19] Qu H Y, Li G Q, Chen S W, et al. Analysis of circular concrete-filled steel tube specimen under lateral impact [J]. Advances in Structural Engineering, 2011, 14(5): 941–951.
[20] Guo J, Cai J, Chen W. Inertial effect on rc beam subjected to impact loads [J]. International Journal of Structural Stability and Dynamics, 2017, 17(04):1750053.
[21] Li H W, Chen W S, Hao H. Dynamic response of precast concrete beam with wet connection subjected to impact loads [J]. Engineering Structures, 2019, 191: 247–263.
[22] 瞿海雁，李国强，孙建运，等．侧向撞击作用下钢管混凝土构件的简化分析模型[J]．同济大学学报(自然科学版)，2011，39(1)：35-41．
QU Haiyan, LI Guoqiang, SUN Jianyun, et al. Simplified analysis model of circular concrete filled steel tube specimen under lateral impact [J]. Journal of Tongji University (Natural Science), 2011, 39(1): 35–41.