论文部分内容阅读
FRP筋是一种新型预应力筋材,具有轻质、高强、耐腐蚀、抗疲劳等优点,但是其横向剪切强度相对较低,这会影响预应力FRP筋混凝土梁的受剪承载力。通过27根混凝土梁的受剪试验,研究了预应力CFRP筋混凝土梁的剪切破坏形态,以及各种参数对其受剪承载力的影响,并与钢绞线预应力混凝土梁的受剪试验结果进行了比较。研究结果表明:预应力CFRP筋混凝土梁的剪切破坏形态有两种:斜压破坏和剪压破坏;剪跨比和配箍率是影响预应力CFRP筋混凝土梁受剪承载力的主要因素;有粘结预应力CFRP筋混凝土梁的受剪承载力比无粘结预应力CFRP筋混凝土梁要大15%左右;通过引入反映预应力筋种类和粘结条件的2个参数,提出了预应力FRP筋混凝土梁的简化受剪承载力计算式,计算结果与试验数据吻合较好。
FRP tendons are a kind of new prestressed tendons, which have the advantages of light weight, high strength, corrosion resistance and fatigue resistance. However, their transverse shear strength is relatively low, which will affect the shear capacity of prestressed FRP reinforced concrete beams. Through the shear tests of 27 concrete beams, the shear failure modes of prestressed concrete beams with CFRP tendons and the influence of various parameters on their shear capacity were studied. The shear tests of the prestressed concrete beams were carried out. The results were compared. The results show that there are two kinds of shear failure modes of prestressed CFRP tendons: baroclinic failure and shear failure; shear span ratio and stirrup ratio are the main factors affecting the shear strength of prestressed CFRP tendons; The shear capacity of prestressed concrete beams with bonded prestressed CFRP tendons is about 15% larger than that of unbonded prestressed CFRP concrete beams. By introducing two parameters that reflect the types of prestressed tendons and the bonding conditions, prestressing force FRP reinforced concrete beam simplified shear capacity formula, the calculated results and experimental data agree well.