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（西安建筑科技大學(xué)土木工程學(xué)院，西安 710055）

［摘要］為研究填充塊材和外圍構(gòu)件對(duì)鋼筋混凝土框格單元結(jié)構(gòu)受力性能的影響，對(duì)4個(gè)框格單元和2個(gè)空框格結(jié)構(gòu)進(jìn)行1/2比例模型加載試驗(yàn)。結(jié)果表明，開裂前填充砌體與鋼筋混凝土框格粘著為一體共同抵抗外力，開裂后結(jié)構(gòu)轉(zhuǎn)化為砌體壓桿抗力機(jī)制。外圍構(gòu)件彎曲剛度對(duì)結(jié)構(gòu)抗裂能力及極限承載能力均有顯著影響。提高填充塊材抗壓強(qiáng)度時(shí)結(jié)構(gòu)極限承載能力顯著提高。當(dāng)填充塊材抗壓強(qiáng)度及彈性模量較低時(shí)，鋼筋混凝土框格單元結(jié)構(gòu)的變形能力很好。

［關(guān)鍵詞］鋼筋混凝土；極限承載能力；混凝土砌塊；彎曲剛度

Influence factor analysis of  load-bearing performance of  fundamental reinforced concrete frame

Yu Lei, Meng Hongrui, Gong Anli

(Xi′an University of Architecture & Technology, Xi′an 710055, China)

Abstract:To investigate the influences of concrete masonry units and frame members on the load-bearing performance of the fundamental reinforced concrete frame in multi-ribbed walls, four fundamental reinforced concrete frames and two corresponding frames without infill were tested.It is revealed that at a low load level, the fundamental reinforced concrete frames act as a monolithic load-resisting system. After the infill partially separate from the bounding frame, the load-resisting mechanism of masonry compressive struts is formed. Enhancing the flexible stiffness of the frame members, both the crack-resisting capacity and ultimate load-resisting capacity are improved. With the increase of the compressive strength of concrete masonry units, the ultimate load-resisting capacity of structures becomes higher. When the compressive strength and elastic module of concrete masonry units is lower, the deformation capacity of the fundamental reinforced concrete frame becomes better.

Keywords:reinforced concrete; ultimate load-resisting capacity; concrete masonry unit; flexible stiffness

*國(guó)家自然科學(xué)基金資助項(xiàng)目(50578011)；陜西高校省級(jí)重點(diǎn)實(shí)驗(yàn)室重點(diǎn)科研資助項(xiàng)目(O2JS28)。

作者簡(jiǎn)介：喻磊，博士，Email:yu@xauat.edu.cn。