- 摘 要
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(太原理工大學土木工程學院, 太原 030024)
摘要: 軸壓比是影響圓中空夾層鋼管混凝土構(gòu)件抗撞性能的一個重要參數(shù),因此,在前期試驗研究基礎(chǔ)上,采用ABAQUS 建立了圓中空夾層鋼管混凝土構(gòu)件在側(cè)向撞擊和軸力荷載耦合作用下的有限元分析模型,研究了不同軸壓比下構(gòu)件抗撞工作機理,并以名義截面含鋼率、空心率與材料強度為主要參數(shù),重點分析了軸壓比對構(gòu)件抗撞性能的影響. 結(jié)果表明:在側(cè)向撞擊和軸力荷載耦合作用下構(gòu)件主要發(fā)生受彎破壞,外鋼管與混凝土的塑性變形是構(gòu)件的主要耗能機制;當軸壓比從 0 增大到 0. 5 時,構(gòu)件的抗撞性能先增強后減弱;隨著構(gòu)件名義截面含鋼率、空心率和外鋼管屈服強度的增大及混凝土強度的減小,軸壓比對構(gòu)件抗撞性能的有利影響范圍分別減小約 75%、57%、15%和 18%.
關(guān)鍵詞: 圓中空夾層鋼管混凝土; 軸壓比; 抗撞性能; 空心率
中圖分類號:TU398. 9 文獻標志碼:A 文章編號:1002-848X(2023)12-0036-07
DOI:10. 19701 / j. jzjg. 20201281
Influence analysis of axial load ratio on impact resistance of circular concrete filleddouble-skin steel tubular
GUO Zhihui, WANG Rui, ZHAO Hui
(College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
Abstract: Axial load ratio is an important parameter that affects the impact resistance of circular concrete filled double-skinsteel tubular (CFDST) members. Therefore, based on preliminary experiments, finite element analysis (FEA) model ofCFDST combined lateral impact and axial load was established using ABAQUS. The working mechanism of CFDSTmembers with different axial load ratio under impact load was investigated. With nominal cross-sectional steel ratio, hollowratio and material strength as the main parameters, the influence of axial load ratio on the impact resistance was emphasislyanalyzed. The results show that under combined lateral impact and axial load, the members failed in flexural mode. Themain energy dissipation mechanism of members was the plastic deformation of outer steel tube and concrete. As the axialload ratio increased from 0 to 0. 5, the impact resistance of members increased first and then decreased. With the increaseof nominal cross-sectional steel ratio, hollow ratio and yield strength of external steel tube, and the decrease of concretestrength, the favorable influence range of axial load ratio on the impact resistance of members decrease by about 75%,57%, 15% and 18% respectively.
Keywords:circular concrete filled double-skin steel tubular; axial load ratio; impact resistance; hollow ratio
∗山西省優(yōu)青研究基金項目(201701D211006).
第一作者:郭志輝,碩士,主要從事組合結(jié)構(gòu)和防災減災研究,Email:guozhihui95@ 163. com.
[引用本文] 郭志輝,王蕊,趙暉. 軸壓比對圓中空夾層鋼管混凝土抗撞性能的影響分析[ J]. 建筑結(jié)構(gòu),2023,53(12):36-42,73. GUO Zhihui,WANG Rui,ZHAO Hui. Influence analysis of axial load ratio on impact resistance ofcircular concrete filled double-skin steel tubular[J]. Building Structure,2023,53(12):36-42,73.
