- 摘 要
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GFRP管-鋼管雙壁約束混凝土組合柱軸壓性能與承載力實用計算方法研究*
（南京工業(yè)大學(xué)土木學(xué)院橋梁工程系，南京 211816）
［摘要］通過4根實心和中空的GFRP管-鋼管雙壁約束混凝土組合短柱軸壓試驗，對比分析了該組合柱的工作機(jī)理、破壞模式、復(fù)合材料管的約束效應(yīng)、核心混凝土本構(gòu)關(guān)系及其影響因素。研究發(fā)現(xiàn)，在其他條件相同的情況下，內(nèi)鋼管空心的構(gòu)件變形能力超過實心構(gòu)件，極限承載力小于實心構(gòu)件，GFRP管對混凝土的約束程度低于實心構(gòu)件；GFRP管徑厚比越小，其對混凝土的約束效應(yīng)越好。GFRP管徑厚比相同的情況下，實心構(gòu)件混凝土峰值應(yīng)力比空心構(gòu)件大，而極限應(yīng)變比空心構(gòu)件小。通過試驗分析了約束混凝土強(qiáng)度模型，并采用極限平衡法推導(dǎo)了可用于計算實心和空心雙壁約束混凝土組合柱軸壓承載力的計算公式，理論計算與試驗結(jié)果吻合較好。
［關(guān)鍵詞］GFRP管-鋼管雙壁約束混凝土；組合柱；軸壓性能；極限平衡法
中圖分類號：TU398-9，TU317-1文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2012)02-0133-06
Experiment and capacity calculation theory research of hybrid GFRP-concrete-steel double skin tubular columns under axial compression
Wang Jun，Liu Weiqing，F(xiàn)ang Hai，Zhu Lu（Department of Bridge Engineering of College of Civil Engineering, Nanjing University of Technology, Nanjing 211816，China）
Abstract:Through axial compression experiment of four solid and hollow hybrid GFRP-concrete-steel double skin tubular short columns, the working principle, failure mode, GFRP tube constraint effect and core concrete constitutive relation, as well as their influence factors under whole axial loading, were contrasted and analyzed . The results indicate that, if other conditions are same, deforming ability of hollow hybrid columns exceeds that of solid hybrid columns, while axial bearing capacity and GFRP constraining effect to concrete are lower than those of solid hybrid columns. Smaller the ratio of GFRP tube’s diameter and wall thickness owe, better the restraint effect of GFRP tube is. In the same condition of GFRP tube diameter and wall thickness ratio, the maximum concrete stress of solid columns is larger than that of hollow columns, while the maximum strain is smaller than that of hollow columns. Confined concrete strength was analyzed through tests, then the-axial bearing capacity calculation formulas of solid and hollow hybrid columns were derived by ultimate equilibrium method. Experiment results confirmed the good agreement with the formula results.
Keywords:GFRP-concrete-steel double skin tubular；hybrid column；axial compression property；ultimate equilibrium method
*國家自然科學(xué)基金(50978134)，江蘇省博士后基金項目(0802071C)，江蘇省高校自然科學(xué)研究項目(11KJB560002)。
作者簡介：王俊，博士，副教授，Email:wangjun3312@njut.edu.cn。
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