樊健生  聂建国  王寒冰  陈  戈
    （清华大学土木工程系  北京 100084）

[提要]  连续组合梁在内支座处的负弯矩区段会出现混凝土板受拉、钢梁受压的不利局面。为了解组合梁在负弯矩作用下的受力性能，并为有关连续组合梁的进一步研究提供依据，对压型钢板组合梁在负弯矩作用下的抗弯性能进行了试验研究。结果表明，按照简化塑性方法计算压型钢板组合梁截面在负弯矩作用下的抗弯承载力与试验结果吻合很好；在其他参数不变的情况下，纵向钢筋配筋量对梁的延性、滑移及裂缝等都有较人的影响；此外，压型钢板对组合梁抗弯承载力的提高作用有限，没计时可以忽略不计。
[关键词]  组合梁  压型钢板  负弯矩  抗弯承载力

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