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(1 蘇州科技大學(xué)土木工程學(xué)院， 蘇州 215011；2 中億豐建設(shè)集團股份有限公司， 蘇州 215131)
［摘要］ 為了研究壓彎剪扭復(fù)合作用下鋼筋聚乙烯醇纖維增強水泥基復(fù)合（PVA-ECC）柱的抗震性能，以軸壓比、扭彎比、剪跨比為變化參數(shù)，設(shè)計了6個PVA-ECC柱試件和1個作為對比試件的普通鋼筋混凝土柱，進行擬靜力試驗，分析試件破壞形態(tài)、滯回曲線、骨架曲線、延性及能量耗散等抗震性能指標(biāo)。結(jié)果表明：在壓彎剪扭復(fù)合作用下，7個試件均發(fā)生扭型破壞；與普通混凝土試件相比，PVA-ECC試件裂縫開展較為緩慢，其開裂荷載、屈服荷載、峰值荷載及極限扭率都明顯提高，說明采用PVA-ECC材料能提高試件的復(fù)合受扭能力和變形能力；軸壓比小、扭彎比大的試件扭轉(zhuǎn)滯回曲線更為飽滿，受扭延性更好；提高軸壓比和剪跨比、減小扭彎比，試件受扭剛度退化加快；試件的受扭強度退化隨試件的軸壓比、剪跨比、扭彎比的提高而加快。
［關(guān)鍵詞］聚乙烯醇纖維增強水泥基復(fù)合（PVA-ECC）柱；壓彎剪扭；扭彎比；剪跨比；抗震性能
中圖分類號：TU375-3 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)22-0109-08
Experimental study on seismic performance of reinforced PVA-ECC columns under torsional load
LING Zhi1, SHAO Yongjian1, FU Shaohua1, YI Leping2
(1 School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011，China；2 Zhongyifeng Construction Group Co., Ltd., Suzhou 215131， China)
Abstract: In order to study the seismic performance of reinforced polyvinyl alcohol-engineered cementitious composite (PVA-ECC) columns under the combined action of compression-flexure-shear-torsion, the axial compression ratio, torsion-flexure ratio and shear-span ratio were used as parameters to study. Six PVA-ECC columns and one reinforced concrete column were designed for comparison. The failure pattern, hysteresis curve, skeleton curve, ductility and energy dissipation were studied by the quasi-static tests. The results show that under the combined action of compression-flexure-shear-torsion, torsional failure occurs in all 7 specimens; Compared with the ordinary concrete specimen, the cracks of PVA-ECC specimens develop slowly, and their cracking load, yield load, peak load and ultimate torsion rate are significantly improved, indicating that the composite torsional capacity and deformation capacity of PVA-ECC specimens can be improved by using PVA-ECC materials; The specimens with small axial compression ratio and large torsion-flexure ratio have fuller torsional hysteretic curves and better torsional ductility; The degradation of torsional stiffness is accelerated by increasing the axial compression ratio and shear-span ratio and reducing the torsion-flexure ratio; The degradation of torsional strength is accelerated with the increase of axial compression ratio, shear-span ratio and torsion-flexure ratio.
Keywords:polyvinyl alcohol-engineered cementitious composite (PVA-ECC) column； compression-flexure-shear-torsion； torsion-flexure ratio； shear-span ratio； seismic performance
*蘇州科技大學(xué)研究生科研創(chuàng)新計劃項目（SKCX18_005），2018年江蘇省研究生科研創(chuàng)新計劃項目（KYCX18_2558）。
作者簡介：凌智，碩士，Email:578931232@qq.com。
