横向冲击作用下圆钢管混凝土构件挠度尺寸效应研究

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摘要由于圆钢管混凝土构件遭受横向冲击下的试验研究大多基于缩尺试验展开，冲击挠度相似律能否满足显得十分重要。本文基于相似准则，建立了钢管混凝土构件遭受横向冲击的相似模型，确定了各个参数间的放缩比例关系，同时利用LS-DYNA建立了钢管混凝土受横向冲击作用的有限元模型，在模型验证可行的基础上，对横向冲击下钢管混凝土构件挠度的尺寸效应进行了分析研究。结果表明：当构件未开裂时，挠度尺寸效应较小，误差在8%以内；当构件发生开裂或断裂时，挠度尺寸效应明显，误差可以达到15%以上。材料动态强度以及材料断裂应力都是不符合相似准则的因素，也是导致钢管混凝土构件冲击试验中挠度尺寸效应的重要原因。并提出了考虑尺寸效应的挠度修正系数，对于未断裂构件，通过小尺寸模型试验即可预测大尺寸原型试验中的挠度。

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	刘艳辉1
	慈伟主1
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	赵一超1
	王路明1
	徐楠1
	梁嘉瑜1

关键词 ：钢管混凝土, 横向冲击, 挠度, 尺寸效应, 数值模拟

Abstract：Since most of the experimental studies on concrete-filled steel tubular members subjected to lateral impact are based on scaled tests, it is very important to satisfy the scaling law of impact. In this paper, based on the similarity criterion, the establishment of a similar model of concrete-filled steel tube subjected to lateral impact, determines the proportional relation between each parameter. On the basis of the model validation, the finite element model of concrete-filled steel tube under lateral impact was established using LS-DYNA, and size effect of deflection for concrete-filled steel tube under lateral impact was analyzed. The results show that the deflection size effect is small and the error is within 8% when members are not cracked. When members crack or fracture, the deflection size effect is obvious, and the error is more than 15%. Gravity, dynamic strength and fracture stress of materials are all factors that do not conform to the similarity criterion, and are also important reasons for the size effect of deflection for concrete-filled steel tube impact test. The deflection correction factor considering the size effect is proposed. The deflection in the large size prototype test can be predicted through the small size model test.

Key words： concrete filled steel tube lateral impact deflection size effect numerical simulation

收稿日期: 2021-08-03 出版日期: 2023-02-15

引用本文:

刘艳辉1，慈伟主1,2，赵一超1，王路明1，徐楠1，梁嘉瑜1. 横向冲击作用下圆钢管混凝土构件挠度尺寸效应研究[J]. 振动与冲击, 2023, 42(3): 103-111.
LIU Yanhui1, CI Weizhu1,2, ZHAO Yichao1, WANG Luming1, XU Nan1, LIANG Jiayu1. Size effects of deflection of concrete-filled circular steel tubular members under lateral impact. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(3): 103-111.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I3/103

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