- 摘 要
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（1 內蒙古科技大學建筑與土木工程學院， 包頭 014010;
2 南京航空航天大學航空宇航學院， 南京 210016）
［摘要］為研究摻入一定量粉煤灰的圓鋼管約束鋼筋混凝土軸壓短柱的承載力，進行了12個試件在單調荷載作用下的試驗研究，試驗主要參數為鋼管徑厚比（D/t=55，73和110）和混凝土中粉煤灰的取代率(0，10%，30%和50%)，考察了該類短柱的破壞模式、極限承載力、延性以及橫向變形系數等，分析了各試驗參數對其受力性能的影響規(guī)律。試驗結果表明，試件破壞時鋼管發(fā)生撕裂或向外凸曲破壞，核心混凝土發(fā)生剪切破壞，縱向鋼筋受壓鼓曲。徑厚比和粉煤灰取代率對試件承載力和延性的影響均較顯著，對試件破壞模式的影響不大。鋼管對核心混凝土的約束作用在峰值荷載后最為充分。綜合考慮破壞模式、承載力和延性等因素，建議實際工程中該類構件的粉煤灰取代率應小于30%，鋼管徑厚比應不大于100為宜。
［關鍵詞］鋼管約束鋼筋混凝土； 短柱； 徑厚比； 軸壓承載力
中圖分類號：TU398+.9文獻標識碼：A文章編號：1002-848X(2017)02-0048-05
Experimental study on the bearing capacity of circular tubed reinforced concrete short column under axial compression
Gao Chunyan1,2, Duan Yaxin1, Zhang Huan1, Yang Huaguan1
(1 Architecture and Civil Engineering Institute, Inner Mongolia University of Science and Technology, Baotou 014010, China; 2 College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
Abstract:In order to study the bearing capacity of circular tubed reinforced concrete axial compression short column incorporated in some fly ash, 12 specimens were carried on the monotonic static test and the main parameters included the diameter thickness ratio of the steel tube (D/t=55, 73 and 110) and the fly ash replacement ratio (0, 10%, 30% and 50%) in concrete, the failure mode, ultimate bearing capacity, ductility and lateral deformation coefficient of these short columns were investigated and the influence of test parameters on the mechanical behavior of specimens were analyzed. The test results show that the steel tubes were torn or convex curved outward, the shear failure occurred in the core concrete and the longitudinal reinforcement buckled when these specimens damaged. The effects of the diameter thickness ratio of steel tube and fly ash replacement ratio in concrete on the bearing capacity and ductility are more obvious, but they have little influence on the failure mode. The restriction effect of the steel tube on the core concrete is the most sufficient after reaching the peak load. Considering the factors such as failure modes, bearing capacity and ductility, it is suggested that the fly ash replacement ratio should be less than 30% and the thickness ratio of the steel tube should be less than 100 in practical engineering.
Keywords:circular tubed reinforced concrete; short column; diameter thickness ratio; axial compression bearing capacity
作者簡介：高春彥，博士研究生，副教授，Email:gao197844@163.com。
