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(1 長(zhǎng)江大學(xué)城市建設(shè)學(xué)院，荊州 434023； 2 西安建筑科技大學(xué)土木工程學(xué)院，西安 710055)

［摘要］進(jìn)行了5榀縮尺比例為1/4的框架中節(jié)點(diǎn)的低周反復(fù)加載試驗(yàn)，對(duì)不同混凝土強(qiáng)度等級(jí)、不同軸壓比下型鋼混凝土梁柱節(jié)點(diǎn)的受剪承載能力進(jìn)行了研究。采用分離式三維實(shí)體模型，考慮各種材料的非線性及型鋼與混凝土之間的粘結(jié)滑移，對(duì)型鋼混凝土框架節(jié)點(diǎn)試件進(jìn)行了有限元分析，并與試驗(yàn)研究結(jié)果進(jìn)行了對(duì)比驗(yàn)證。通過有限元模型的參數(shù)調(diào)整進(jìn)行了數(shù)值模擬，定量分析了高強(qiáng)混凝土脆性對(duì)節(jié)點(diǎn)受剪承載能力的影響。通過引入混凝土強(qiáng)度影響系數(shù)來考慮混凝土脆性增大對(duì)節(jié)點(diǎn)受剪承載力的影響，對(duì)《型鋼混凝土組合結(jié)構(gòu)技術(shù)規(guī)程》(JGJ138—2001)中計(jì)算公式進(jìn)行了補(bǔ)充。

［關(guān)鍵詞］型鋼混凝土結(jié)構(gòu)；高強(qiáng)混凝土；節(jié)點(diǎn)；受剪承載力

Shear capacity formulas of SRC frame joints considering brittle property of high strength concrete

Zeng Lei¹, Xu Chengxiang¹, Zheng Shansuo²(1 School of Urban Construction, Yangtze University, Jingzhou 434023, China;2 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China)

Abstract:Cyclic loading tests were carried out on five 1/4-scale interior joints to understand mechanical characteristics and seismic behaviors of steel reinforced concrete frame joints. The test parameters taken into account were concrete strength and axial column load. Finite element analysis applying 3D solid elements and considering material nonlinear and bond-slip between steel and concrete was presented. Based on adjustment of model parameters in finite element analysis, the influence of brittle property of high strength concrete on the shear capacity was analyzed. The practical calculating formulas of shear bearing capacity of such joints were derived, in which the influence of concrete strength and axial column load were considered.

Keywords:steel reinforced concrete structure; high strength concrete; joints; shear capacity

國(guó)家自然科學(xué)基金項(xiàng)目(50378080)