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樊健生 聶建國 王寒冰 陳 戈
（清華大學(xué)土木工程系 北京 100084）[提要] 連續(xù)組合梁在內(nèi)支座處的負彎矩區(qū)段會出現(xiàn)混凝土板受拉、鋼梁受壓的不利局面。為了解組合梁在負彎矩作用下的受力性能，并為有關(guān)連續(xù)組合梁的進一步研究提供依據(jù)，對壓型鋼板組合梁在負彎矩作用下的抗彎性能進行了試驗研究。結(jié)果表明，按照簡化塑性方法計算壓型鋼板組合梁截面在負彎矩作用下的抗彎承載力與試驗結(jié)果吻合很好；在其他參數(shù)不變的情況下，縱向鋼筋配筋量對梁的延性、滑移及裂縫等都有較人的影響；此外，壓型鋼板對組合梁抗彎承載力的提高作用有限，沒計時可以忽略不計。
[關(guān)鍵詞] 組合梁 壓型鋼板 負彎矩 抗彎承載力Advcrse condition of concrcte in tcnsion and stccl joist in cornprcssion occurs at inncr support rcgions of continuous composite stccl-concrcte bcams. In ordcr to study the pcrformance of composite bcams undcr ncgative bcnding, and to make prcparation for continuing rcscarch on continuous composite bcams, cxpcrimcnts on composite bcams with profilcd shccting arc conductcd. The analysis shows that the cvaluation of ultimate flcxural capacity by simple plastic mcthod is wcll coincidcd with the tcst rcsults. The amount of rcinforccmcnt has an cvidcnt cffcct on the ductility of bcam, the slip at the bcam-
slab intcrface and the cracking in the slab. Furthcrmorc, the profilcd shccting has little contribution to the flcxural capacity, and can be ncglcctcd in dcsign.
Keywords: co:mposite stccl-concrcte bcams; profilcd shccting; ncgative bcnding; flcxural capacity
