- 摘 要
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（1 廣西大學(xué)土木建筑工程學(xué)院， 南寧 530004；2 廣西大學(xué)工程防災(zāi)與結(jié)構(gòu)安全教育部重點實驗室， 南寧 530004）
［摘要］為了研究螺旋箍筋PVC管聯(lián)合約束混凝土短柱的受力性能，設(shè)計了20個試件進(jìn)行軸壓試驗，包含12個螺旋箍筋PVC管聯(lián)合約束短柱試件、7個單純PVC管約束短柱試件和1個普通鋼筋混凝土短柱對比試件。試驗考慮了約束核心區(qū)面積比、螺旋箍筋直徑和間距、縱向鋼筋直徑以及方形箍筋間距等變化參數(shù)。通過試驗觀察了試件的受力過程與形態(tài)，獲取其軸向荷載-位移曲線、極限承載力、延性系數(shù)、耗能因子等數(shù)據(jù)，并分析了核心區(qū)面積比、螺旋箍筋直徑及間距、縱向鋼筋直徑、方形箍筋間距等參數(shù)對試件軸壓性能的影響規(guī)律。研究結(jié)果表明：單純PVC管約束混凝土短柱及螺旋箍筋PVC管聯(lián)合約束混凝土短柱的破壞過程和形態(tài)與普通鋼筋混凝土短柱相似。與普通鋼筋混凝土短柱相比，單純PVC管約束的混凝土短柱的極限承載力更低，但延性及耗能能力有所增加。對于螺旋箍筋PVC管聯(lián)合約束混凝土短柱而言，加密螺旋箍筋間距可以顯著提高其極限承載力，但會削弱試件的延性及耗能能力；增大螺旋箍筋直徑，能夠略微提高試件延性及耗能能力，對極限承載力影響不大；增大螺旋箍筋PVC管核心區(qū)面積比，可以增大試件的極限承載力，但會降低其延性及耗能能力；與普通鋼筋混凝土相似，增大縱向鋼筋直徑或加密方形箍筋間距，均能提高試件的承載能力、延性及耗能能力。
［關(guān)鍵詞］螺旋箍筋； PVC管； 聯(lián)合約束； 短柱； 軸心受壓
中圖分類號：TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)02-0043-06
Experimental study on axial compressive short concrete column cooperatively constrained by PVC tube and spiral stirrup
Chen Zongping1,2, Yang Yang1
(1 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2 Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education， Guangxi University, Nanning 530004, China)
Abstract:In order to study the mechanical properties of short concrete columns cooperatively constrained by PVC tube and spiral stirrup, 20 specimens were designed for axial compression test, including 12 short column specimens cooperatively constrained by PVC tube and spiral stirrup, 7 short column specimens constrained by pure PVC tube and 1 comparison specimen of ordinary reinforced concrete short column. The parameters such as cooperatively constrained core area ratio, diameter and spacing of spiral stirrup , diameter of longitudinal reinforcement and spacing of square stirrups were taken into account. The axial load-displacement curve, ultimate bearing capacity, ductility coefficient and energy dissipation factor of the specimens were obtained by observing the stress process and shape of the specimens through experiments. The impacts of the parameters above on axial compressibility of the specimens were analyzed. The results show that the failure process and shape of concrete short columns that cooperatively constrained by PVC tube and spiral stirrup or constrained by pure PVC tube are similar to those of ordinary reinforced concrete short columns. Compared with those ordinary reinforced concrete short columns, the bearing capacity of column specimens constrained by pure PVC tube is lower, and the ductility and energy dissipation capacity are increased. Strengthening spiral stirrup spacing can significantly increase ultimate bearing capacity of column specimens cooperatively constrained by PVC tube and spiral stirrup, but it will weaken the ductility and energy dissipation capacity of the specimens; increasing the diameter of spiral stirrup can slightly improve the ductility and energy dissipation capacity of the specimens, but has little effect on ultimate bearing capacity; increasing the cooperatively constrained core area ratio can increase ultimate bearing capacity of the specimens, but will reduce their ductility and energy dissipation capacity; like ordinary reinforced concrete, increasing the diameter of longitudinal reinforcement and strengthening square stirrups spacing can improve ultimate bearing capacity, ductility and energy dissipation capacity of the specimens.
Keywords:spiral stirrup; PVC tube; cooperative constraint; short column; axial compression
*國家自然科學(xué)基金項目（51578163），廣西自然科學(xué)基金重點項目（2016GXNSFDA380032），廣西高等學(xué)校高水平創(chuàng)新團(tuán)隊及卓越學(xué)者計劃資助項目（桂教人［2017］38號）。
作者簡介：陳宗平，博士，教授，博士生導(dǎo)師，Email: zpchen@gxu.edu.cn。
