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1東南大學(xué)混凝土及預(yù)應(yīng)力混凝土結(jié)構(gòu)教育部重點實驗室，南京，210096；
2中國電子工程設(shè)計院，北京，100840。
【提要】 外包鋼-混凝土組合梁是在由冷彎薄壁型鋼與厚鋼板焊接成的U型鋼梁內(nèi)澆注混凝土構(gòu)件，并用必要的構(gòu)造措施使型鋼和混凝土共同工作。為研究這種新型組合梁的受力性能，完成了10根外包鋼混凝土組合簡支梁受彎試驗。試驗結(jié)果證明這種組合梁具有較優(yōu)越的力學(xué)性能，但在受力過程中存在兩個受力薄弱面，薄弱面的破壞會導(dǎo)致新型組合梁發(fā)生縱向水平剪切破壞和縱向滑移破壞，需在設(shè)計中避免。
【關(guān)鍵詞】 組合梁 U型鋼梁 滑移破壞 水平剪切破壞
Experimental Study on  Steel Encased Concrete Composite Beam/Du Derun1，Li Aiqun1，Chen Lihua1，Shi Qiyin1，Xiao Hui1，Lou Yu2，Li Peibin2 (1 Key Lab of RC & PC Structures Minister of Education PRC, Eastsouth University,Nanjing 210096,China; 2 China Electronics Engineering Design Institute, Beijing 100840，China)
Abstract:A newstyle steel encased concrete composite beam is presented. It is formed by
encasing the concrete into the Ushaped steel beam welded by coldformed sheets and a thick steel plate. The two parts cooperate with each other by indispensable constructional measure. Ten tests of the newstyle steel encased concrete composite simply supported beams had been performed to investigate the  mechanical performance. The test results show that the new style steel encased concrete composite beam has excellent mechanical performance. However, there are two shearoff planes, which would cause the longitudinal horizontal shear failure and the longitudinal slip failure of composite beams. The two failure modes must be avoided in design.
Keywords:composite beam; Ushaped steel beam; slip failure; horizontal shear failure
*《外包鋼組合梁設(shè)計與施工規(guī)程》研究課題。