- 摘 要
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(1 內(nèi)蒙古科技大學(xué)土木工程學(xué)院， 包頭 014010；2 內(nèi)蒙古第三電力建設(shè)工程有限責(zé)任公司， 包頭 014010)
［摘要］為研究既有鋼框架柱在采用PEC(partially encased concrete)方法加固后的抗震性能，完成1個PEC柱-型鋼梁中柱節(jié)點及1個鋼框架中柱節(jié)點的低周往復(fù)加載試驗。分析了試件的破壞形態(tài)、承載能力、梁端塑性鉸區(qū)彎矩-轉(zhuǎn)角曲線、延性性能、耗能能力、節(jié)點區(qū)域相關(guān)構(gòu)件的應(yīng)變。結(jié)果表明：采用PEC方法加固后，框架中柱節(jié)點滯回曲線呈紡錘形，試件初始剛度、承載力分別提升約40%，31.1%，且具有較好的延性性能及耗能能力；試件破壞形態(tài)為梁彎曲破壞，梁端塑性鉸具有很好的轉(zhuǎn)動能力。節(jié)點基本完好，實現(xiàn)了“強柱弱梁、強節(jié)點弱構(gòu)件”的抗震設(shè)計目標(biāo)。
［關(guān)鍵詞］既有鋼框架柱； PEC方法加固； 低周往復(fù)加載試驗； 抗震性能
中圖分類號：TU398+.9 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)11-0113-06
Experimental study on seismic performance of existing middle column reinforced by PEC method
LI Bushuan1, BAI Yang2, ZHAO Gentian1, WAN Xin1, WANG Shan1
(1 School of Civil Engineering, Inner Mongolia University of Science & Technology， Baotou 014010， China； 2 Inner Mongolia Third Power Construction Engineering Co., Ltd., Baotou 014010， China)
Abstract: To study the seismic performance of the steel frame column after being reinforced by PEC (partially encased concrete) method, one PEC column-steel beam middle column joint and one steel frame middle column joint were tested under low-cycle reversed loading. The failure morphology, load carrying capacity, beam end plastic reaming area bending moment-corner curve, ductility performance, energy dissipation capacity, strain of key parts in the specimen were analyzed. The results show that the nodal hysteresis curve in the reinforced frame is spindle-shaped, the initial stiffness and bearing capacity of the specimen are increased by about 40% and 31.1% respectively, the specimen still has good ductility and energy dissipation ability. The specimen failure is the bending failure of the beam, and the rotation capacity is still superior in the beam end plastic reaming area. The nodes are basically intact, and the seismic design goal of “strong column weak beam and strong node weak member” was realized.
Keywords:existing steel frame column； PEC method reinforcement； low-cyclic reversed loading test； seismic performance
*國家自然科學(xué)基金項目(51268042)，內(nèi)蒙古科技大學(xué)土木工程學(xué)院攀登計劃項目(KY-01)，內(nèi)蒙古科技大學(xué)創(chuàng)新基金項目(2019QDL-S08)。
作者簡介：李補拴，碩士，工程師，Email: libushuan@163.com；通信作者：趙根田，教授，碩士生導(dǎo)師，Email: zhaogentian93110@sina.com。
