钢-混凝土组合梁抗裂性能的试验研究  

Experimental study of crack resistance of steel-concrete composite beams

作　　者：樊健生[1] 聂建国[1] 张彦玲[2] 

机构地区：[1]清华大学,北京100084 [2]石家庄铁道大学,河北石家庄050043

出　　处：《土木工程学报》2011年第2期1-7,共7页China Civil Engineering Journal

基　　金：国家自然科学基金(50408001);河北省自然科学基金(E2009000893);河北省教育厅基金(927017)

摘　　要：为研究钢-混凝土连续组合梁的受力性能,特别是体外预应力对抗裂性能和刚度的影响,完成3根反向加载的简支组合梁和3根2跨连续组合梁的静力加载试验,其中包括2根在钢梁和混凝土板内折线布筋的体外预应力组合梁。试验表明:非预应力组合梁在负弯矩作用下的开裂荷载较低,连续梁在较低荷载下就会由于混凝土开裂而发生明显的内力重分布,且横向钢筋间距对裂缝间距具有一定影响;折线布筋的体外预应力组合梁开裂荷载增大,裂缝间距和裂缝宽度明显减小,且相同荷载下的挠度下降,说明体外预应力可有效改善组合梁的综合受力性能。此外,预应力作用对组合梁的滑移分布有较明显影响。In order to study the mechanical behaviors of continuous steel-concrete composite beams,especially for the influence of external prestress on the crack resistance and stiffness,static model tests are conducted for three simply supported steel-concrete composite beams under negative moment and three continuous two-span composite beams under point loads,with the model beams including two externally prestressed composite beams with the tendons laid in fold.The results show that the cracking load of the composite beams without prestress is rather low,the internal force redistributes in the continuous composite beams due to concrete cracking when the load is very small,and the crack space is influenced by the transverse reinforcement space.Otherwise,the cracking load of the composite beams with prestress is large,and the crack space,crack width,and deformation under the same load all decrease apparently,which indicate that external prestress on composite beams can enhance its comprehensive behavior.The influence of prestress on the slip pattern between the steel girder and the concrete slab is also obvious.

关 键 词：钢-混凝土组合梁 模型试验 负弯矩区 体外预应力 裂缝 滑移 

分 类 号：TU398.5[建筑科学—结构工程]