- 摘 要
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(1 燕山大學(xué)建筑工程與力學(xué)學(xué)院，秦皇島 066004；2 紹興文理學(xué)院土木工程學(xué)院，紹興 312000)
［摘要］ 鋼筋混凝土承重柱會因地震動的隨機性而斜向受力，從而呈現(xiàn)與單向主軸受力時不同的抗震性能。對3個試驗軸壓比為0.6、剪跨比為4的RC方柱進行了不同加載角度0°，22.5°，45°下的低周往復(fù)加載試驗，研究了斜向受力下高軸壓比RC柱的承載能力、耗能能力、剛度和變形能力等抗震性能。結(jié)果表明：斜向受力導(dǎo)致高軸壓比RC方柱的正截面承載力降低，滯回環(huán)捏攏現(xiàn)象加劇，割線剛度無顯著變化，但變形能力增強；各項抗震性能指標(biāo)隨加載角度的變化規(guī)律為：正截面承載力與加載角度（0°~45°）呈負相關(guān)關(guān)系，耗能能力隨加載角度的增加先降后升，延性系數(shù)則先增后減，以22.5°加載試件耗能能力最差，但延性最好。
［關(guān)鍵詞］鋼筋混凝土柱； 斜向受力； 抗震性能； 高軸壓比； 加載角度
中圖分類號：TU375-3 文獻標(biāo)識碼：A文章編號：1002-848X(2021)12-0056-06
Seismic performance tests of RC square columns with high axial compression ratio under oblique earthquake ground motion
SONG Kun1, WANG Wei2
(1 College of Civil Engineering and Mechanics, Yanshan University，Qinhuangdao 066004， China；2 School of Civil Engineering, Shaoxing University，Shaoxing 312000， China)
Abstract: The reinforced concrete (RC) columns subject to oblique force due to the randomness of ground motion, and present different seismic performances compared with unidirectional principal axes. Quasi-static tests under different loading angles 0°,22.5°,45°of three square columns with 0.6 axial compression ratio and 4 shear span ratio were performed, and the seismic performance of bear capacity, energy consumption, stiffness, deformation capacity of RC columns with high axial compression ratio under oblique force were studied. The results show that the oblique force reduces flexural bearing capacity of RC columns with high axial compression ratio, aggravates hysteresis ring pinching phenomenon, effects secant stiffness slightly, but intensifies deformation capacity. The seismic performance indexes vary with the loading angle as follows: the bearing capacity is negatively correlated with the loading angle (0°~45°), the energy dissipation capacity falls first and then rises with the increasing of loading angle, on the contrary, the ductility factor enhances at first and then decreases, and the specimen at 22.5° loading has the worst energy dissipation capacity but the best ductility.
Keywords:reinforced concrete column； oblique force； seismic performance； high axial compression ratio； loading angle
*國家自然科學(xué)基金項目（51508493)，河北省博士后科研項目擇優(yōu)資助項目（B2016005003）。
作者簡介：宋坤，博士，講師，碩士生導(dǎo)師，Email:songkun_2002@163.com。
