活性粉末混凝土型钢梁抗剪性能研究

Research on Shear Behavior of Steel Reinforced Reactive Powder Concrete Beams

目的研究活性粉末混凝土型钢梁受剪荷载作用下的抗剪性能,以解决当前组合结构因抗剪承载力不足而导致的构件截面尺寸不合理、结构自重过大等问题。方法设计6根足尺活性粉末混凝土型钢梁进行静载抗剪试验,分析RPC强度、剪跨比及含钢率对试验梁抗剪承载力及破坏形态的影响。结果试验梁经过弹性、开裂、裂缝发展和破坏4个阶段,破坏时没有出现粘结滑移现象,斜裂缝呈现细而密的特点;剪跨比对试验梁抗剪承载力的影响显著,当剪跨比为1时,将RPC强度从120 MPa提升至150 MPa、含钢率从6.6%提升至7.4%,抗剪承载力的增幅分别为16.8%和10.6%。结论这种新型的组合梁能充分发挥RPC和型钢的材料强度,通过点焊进行固定的箍筋能起到锚固作用,使RPC和型钢能够良好协同工作。

In order to overcome the problems of the normal composite structure′s unreasonable section size and excessive structure self-weight which due to the insufficient shear capacity.The shear behavior of steel reinforced reactive powder concrete beam is studied in this paper.Six full-scale SRRPC beams were made to be carried out static load shear experiment.The influences of RPC strength,shear span ratio and steel content on shear capacity and failure modes of SRRPC beams were mainly considered.After four stages of elastic working,cracking,cracks developing and destroying,the specimens show the fine and dense inclined cracks,but did not appear slip when they were destroyed.The shear span ratio has a significant effect on the shear capacity.When shear span ratio is 1,we made RPC strength increase from 120 MPa to 150 Mpa and steel content increase from 6.6%to 7.4%,the shear capacity was increased by 16.8%and 10.6%,respectively.This new type of composite beam can take full advantage of material strength of RPC and steel.Stirrup fixed by spot welding can play an anchoring role,and made RPC and I-shape steel work in good coordination until specimens damaged.