负弯矩区附加钢筋对钢-混凝土组合梁性能影响试验研究

Experimental study on effect of additional rebar on performance of steel-concrete composite beam in negative moment region

钢-混凝土组合结构梁柱连接中,当柱截面尺寸较大时,便存在梁内钢筋如何与柱的连接问题。结合实际,针对工程中所遇到的负弯矩区钢-混凝土组合梁翼缘板中附加纵筋如何与方钢管混凝土柱连接的问题,通过对采用两种不同附加纵筋连接形式的试件进行试验研究,得到翼缘板中不同的附加分布纵筋连接形式对负弯矩区钢-混凝土组合梁受力性能的影响。研究结果表明:钢-混凝土组合梁翼缘板中附加分布纵筋通过套筒与方钢管混凝土柱连接的方式,与将附加分布纵筋设置在柱两侧的方式相比,承载能力相差不大,但混凝土板的受力更合理。

When the column section size is large in steel-concrete composite structure,how to connect the rebar in beam to column is a big problem in beam-column connections of building structures.Based on actual engineering projects,the connection of additional rebars in steel-concrete composite beam to column in negative moment region was studied by experiments on two specimens,which have different rebar connection methods so as to understand the effects of different forms of rebar connection on the mechanical properties of steel-concrete composite beam in the negative moment region.The research results show that,compared with setting the reinforcement on both sides of the column,connecting the additional rebars on top flange of the steel-concrete composite beam to column by sleeve connectors can result in similar load carrying capacity,while the stress distribution on concrete slab is more reasonable.