环形脱空对圆钢管混凝土柱抗侧向冲击性能的影响分析

沈奇罕1, 2, 3, 刘俊杰1, 朱维军1, 王静峰1, 3, 谢强1

振动与冲击 ›› 2024, Vol. 43 ›› Issue (16) : 92-102.

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (16) : 92-102.
论文

环形脱空对圆钢管混凝土柱抗侧向冲击性能的影响分析

  • 沈奇罕1,2,3,刘俊杰1,朱维军1,王静峰1,3,谢强1
作者信息 +

Investigations on the influence of circumferential gaps on the lateral impact behaviour of circular CFST columns

  • SHEN Qihan1,2,3,LIU Junjie1,ZHU Weijun1,WANG Jingfeng1,3,XIE Qiang1
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文章历史 +

摘要

近年来随着社会机械化水平的不断提高和交通事业的飞速发展,车辆、船舶及飞行器等机械撞击城市高架、跨河桥梁墩柱等事故的发生频率显著提升。而实际钢管混凝土结构由于材料特性或服役环境等问题普遍存在脱空缺陷情况,但目前有关脱空缺陷对钢管混凝土冲击性能的影响研究仍相对较少。为此,本文构建了侧向冲击作用下含环形脱空圆钢管混凝土柱有限元分析模型,并通过相关试验验证模型的准确性。揭示了环形脱空对圆钢管混凝土柱在侧向冲击作用下破坏模式、时程曲线特征、冲击全过程应力应变发展和界面接触行为的影响机理,系统研究了脱空率、轴压比、边界条件、径厚比、冲击速度和冲击质量等诸多参数对侧向冲击作用下含环形脱空圆钢管混凝土柱冲击力、挠度变形和耗能等动力响应的影响规律。结果表明,环形脱空的存在将逐步降低圆钢管混凝土柱的抗侧向冲击能力。随着脱空率的增大,圆钢管混凝土柱的冲击力和耗能逐步减小,挠度变形相应增大。同时,由于缺乏混凝土的有效支撑,钢管在侧向冲击作用下的凹陷变形程度也随着脱空率的增大而愈发显著。

Abstract

The frequency of vehicle and ship impact accidents acting on the piers of city viaducts and river-crossing bridges is highly improved in recent years. Nevertheless, the concrete gap defect is observed to commonly exist in concrete-filled steel tubular (CFST) engineering practices, due to disadvantageous factors in material properties and working environment. While few investigations on the lateral impact behavior of CFST members with concrete gap defects have been reported. Therefore, this paper developed a finite element (FE) model of circular CFST column under lateral impact considering the feature of the circumferential gap, and the accuracy of the FE model is validated by some relative experiments. The influence mechanism of circumferential gaps on the typical failure modes, the featured time history curves, the stress/strain distribution rule during the full-range impact process and the steel-concrete contact bahaviour of the circular CFST column is revealed in detail. Moreover, the effect of gap ratio, axial compression ratio, boundary condition, diameter/thickness ratio, impact velocity and impact mass, etc. on the impact force, the flexural deflection and the energy dissipation is investigated systematically. The results shows that the lateral impact resistance of the circular CFST column is gradually weakened by the existence of circumferential gap. With the increase of circumferential gap ratio, the impact force and energy dissipation of the circular CFST column are reduced by degrees, while the flexural deflection shows an opposite trend. In addition, the local depression degree of the steel tube under lateral impact would be more obvious with the increase of void ratio, due to the lack of efficient supporting effect provided by the core concrete.

关键词

环形脱空 / 钢管混凝土 / 侧向冲击 / 数值分析 / 破坏机理

Key words

circumferential gap / concrete-filled steel tube / lateral impact / numerical analysis / failure mechanism

引用本文

导出引用
沈奇罕1, 2, 3, 刘俊杰1, 朱维军1, 王静峰1, 3, 谢强1. 环形脱空对圆钢管混凝土柱抗侧向冲击性能的影响分析[J]. 振动与冲击, 2024, 43(16): 92-102
SHEN Qihan1, 2, 3, LIU Junjie1, ZHU Weijun1, WANG Jingfeng1, 3, XIE Qiang1. Investigations on the influence of circumferential gaps on the lateral impact behaviour of circular CFST columns[J]. Journal of Vibration and Shock, 2024, 43(16): 92-102

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