【摘要】：該文以試驗(yàn)研究、有限元模擬以及理論分析相結(jié)合的方法研究了負(fù)載下外包鋼筋混凝土加固軸心受壓鋼柱的受力性能以及承載力計(jì)算方法。通過試驗(yàn)與有限元模擬分析,研究了軸心受壓鋼結(jié)構(gòu)構(gòu)件負(fù)載下外包鋼筋混凝土加固后的性能,以及初始負(fù)載大小、混凝土強(qiáng)度和型鋼強(qiáng)度對(duì)加固試件極限承載力的影響。研究表明,外包鋼筋混凝土可以顯著提高原鋼構(gòu)件的承載能力和剛度;加固后試件的極限承載力隨著初始負(fù)載的增大而降低;隨著型鋼強(qiáng)度的提高而增大;混凝土強(qiáng)度是影響加固后試件極限承載力的最主要因素,加固后試件的極限承載力隨著混凝土強(qiáng)度的提高而明顯增大。根據(jù)分析試驗(yàn)數(shù)據(jù)和有限元分析結(jié)果,得到了混凝土強(qiáng)度對(duì)加固后試件極限承載力影響的量化結(jié)果。同時(shí),通過分析加固時(shí)和破壞時(shí)構(gòu)件各部分的應(yīng)力應(yīng)變狀態(tài),推導(dǎo)出負(fù)載下外包鋼筋混凝土加固軸心受壓鋼柱的承載力計(jì)算公式,其計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合良好。
[Abstract]:In this paper, the mechanical behavior and bearing capacity of steel columns strengthened with reinforced concrete under load are studied by means of experimental study, finite element simulation and theoretical analysis. By means of experiment and finite element simulation, the behavior of reinforced concrete under the load of axially compressed steel structure is studied, as well as the effect of initial load size, concrete strength and section steel strength on ultimate bearing capacity of strengthened specimens. The results show that the bearing capacity and stiffness of the original steel members can be improved significantly by the reinforced concrete, the ultimate bearing capacity of the specimens decreases with the increase of the initial load, and increases with the increase of the strength of the section steel. The strength of concrete is the most important factor affecting the ultimate bearing capacity of the reinforced specimen. The ultimate bearing capacity of the strengthened specimen increases with the increase of the strength of the concrete. Based on the experimental data and the results of finite element analysis, the quantitative results of the effect of concrete strength on the ultimate bearing capacity of reinforced specimens are obtained. At the same time, by analyzing the stress-strain state of the members during reinforcement and failure, a formula for calculating the bearing capacity of steel columns strengthened with reinforced concrete under load is derived. The calculated results are in good agreement with the experimental results.
【作者單位】： 沈陽大學(xué)建筑工程學(xué)院;清華大學(xué)土木工程系;沈陽建筑大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51408371) 遼寧省優(yōu)秀人才培育計(jì)劃項(xiàng)目(2014020098) 沈陽市科技計(jì)劃項(xiàng)目(F14-196-4-00) 遼寧省博士啟動(dòng)基金項(xiàng)目(20141092)
【分類號(hào)】：TU391

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