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（西安理工大學(xué)土木建筑工程學(xué)院， 西安 710048）

［摘要］上下部結(jié)構(gòu)的連接節(jié)點(diǎn)是RC框架-輕鋼增層混合結(jié)構(gòu)抗震設(shè)計(jì)的關(guān)鍵所在，對(duì)兩個(gè)上柱分別為工字形和箱形的露出式剛接混合節(jié)點(diǎn)進(jìn)行低周反復(fù)加載試驗(yàn)，通過對(duì)比分析節(jié)點(diǎn)的破壞形態(tài)、滯回曲線、骨架曲線、強(qiáng)度退化、剛度退化、耗能能力，研究了RC框架-輕鋼增層混合結(jié)構(gòu)的上部結(jié)構(gòu)截面形式的不同對(duì)露出式剛接節(jié)點(diǎn)抗震性能的影響。試驗(yàn)結(jié)果表明：兩個(gè)試件均在混凝土梁根部發(fā)生剪切破壞，上部為箱形鋼柱的節(jié)點(diǎn)，滯回環(huán)更為飽滿，捏攏較少，承載能力、強(qiáng)度與剛度退化能力、等效黏滯阻尼系數(shù)、耗能能力等均優(yōu)于上部為工字形鋼柱的節(jié)點(diǎn)； 保持下部結(jié)構(gòu)不變，上部選用箱形鋼柱，有利于提高節(jié)點(diǎn)的抗震性能。

［關(guān)鍵詞］RC框架-輕鋼增層混合結(jié)構(gòu)； 露出式剛接節(jié)點(diǎn)； 工字形鋼柱； 箱形鋼柱； 抗震性能

中圖分類號(hào)：TU375, TU391文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)22-0111-08

Study on the seismic behavior of exposed rigid connection node for RC frame-mixed structure with adding light steels

PAN Xiuzhen, YIN Chenhao, ZHOU Xingxin, WANG Pan, TIAN Jianbo

(School of Civil Engineering and Architecture， Xi′ an University of Technology， Xi′ an 710048, China)

Abstract:The node of the upper and lower structure is the key to the seismic design of RC frame-mixed structure with adding light steels. Two exposed rigid connection nodes whose the upper  columns are I-shaped and box shaped were tested under low cycle load reversals.Several indexes such as the failure modes，hysteretic curve，skeleton curve，retrogression of strength，rigidity degeneration and energy dissipation capacity of specimens were compared and analyzed to study the influence of the seismic behavior for RC frame-mixed structure with adding light steels with different section form of the upper structure. The results show that both specimens have shear failure at the root of concrete beams. For the node with box-shaped steel column，its hysteresis loop is more full and pinch phenomenon of hysteresis curve is less, its ability of delayed degradation of bearing capacity, strength and stiffness degradation, equivalent viscous damping coefficient and energy dissipation capacity are better than the node with I-shaped steel column. Keeping the lower structure unchanged, box shaped steel column for upper steel column is beneficial to improve the seismic performance of the node.

Keywords:RC frame-mixed structure with adding light steels; exposed rigid connection node; I-shaped steel column;box shaped steel column； seismic behavior

 *國家自然科學(xué)基金資助項(xiàng)目（51608441），中國博士后科學(xué)基金面上資助項(xiàng)目（2017M613174），陜西省自然科學(xué)基礎(chǔ)研究計(jì)劃資助項(xiàng)目（2017JQ5032），陜西省高?？茀f(xié)青年人才托舉計(jì)劃項(xiàng)目（20170513）。

作者簡介：潘秀珍，博士，副教授，碩士生導(dǎo)師，Email:13571828178@163.com。