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（長(zhǎng)江大學(xué)城市建設(shè)學(xué)院， 荊州 434023）

［摘要］為揭示非對(duì)稱配鋼型鋼混凝土柱的受力特點(diǎn)和破壞機(jī)理，考慮剪跨比、軸壓比、體積配箍率以及拉結(jié)筋等4個(gè)影響因素，對(duì)12個(gè)T形配鋼型鋼混凝土柱進(jìn)行了水平低周往復(fù)荷載試驗(yàn)。對(duì)水平低周反復(fù)荷載和恒定軸向荷載作用下試件的受力過程和破壞特征進(jìn)行了研究，結(jié)果表明：非對(duì)稱配鋼型鋼混凝土柱具有較好的滯回性能和耗能性能，其破壞形態(tài)主要有彎曲破壞、剪切斜壓破壞和剪切粘結(jié)破壞三類。通過實(shí)測(cè)型鋼腹板和箍筋的荷載-應(yīng)變滯回曲線，分析了試件在不同階段的受力狀態(tài)，基于破壞機(jī)理和力學(xué)分析推導(dǎo)了T形配鋼型鋼混凝土柱發(fā)生剪切斜壓破壞和剪切粘結(jié)破壞時(shí)的受剪承載力計(jì)算公式，計(jì)算結(jié)果與實(shí)測(cè)值符合較好。

［關(guān)鍵詞］型鋼混凝土結(jié)構(gòu); T形配鋼; 破壞機(jī)理; 受剪承載力

中圖分類號(hào)：TU375.3        文獻(xiàn)標(biāo)識(shí)碼：A        文章編號(hào)：1002-848X(2014)04-0030-05

Shear mechanism and bearing capacity study of steel reinforced concrete columns with unsymmetrical steel reinforcement

Zeng Lei, Zhou Qin, Wu Yuanyuan, Shi Feng

(School of Urban Construction, Yangtze University, Jingzhou 434023, China)

Abstract: To investigate mechanical characteristics and failure mechanism of steel reinforced concrete (SRC) columns with unsymmetrical steel reinforcement, 12 columns with T-shaped steel reinforcement were tested under low cyclic loads considering the influence of shear span ratio, axial compression ratio, stirrup ratio and presence of cross tie. Loading process and failure characteristics under low cyclic loads and constant axial loads were studied. It is shown that the columns have good hysteretic characteristics as well as dissipation capacity and the failure patterns of the SRC columns with unsymmetrical steel reinforcement contains bending failure, shear-bond failure and shear compression failure. Based on the analysis of the load-strain hysteretic curves of steel web and stirrups, different mechanism states of specimen in different stages were analyzed. And according to the mechanical analysis and failure mechanism results, the calculation formula of shear capacity was established under the modes of shear compression failure and shear-bond failure. The results of formulas agree well with the test data.

Keywords: steel reinforced concrete structure; T-shaped steel reinforcement; failure mechanism; shear capacity

*國家自然科學(xué)基金項(xiàng)目（51108041），湖北省高等學(xué)校優(yōu)秀中青年科技創(chuàng)新團(tuán)隊(duì)計(jì)劃項(xiàng)目(T201303)，湖北省自然科學(xué)基金項(xiàng)目（2011CDB009）。 

作者簡(jiǎn)介：曾磊，博士，副教授,Email:zenglei28@126.com。

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