HPFRCC装配整体式叠合梁受弯性能试验研究

Experimental study on bending performance of high-performance fiber reinforced cement composite prefabricated monolithic composite beams

为改善装配整体式叠合梁的力学性能以及耐损伤性能,本文将HPFRCC材料预制模壳代替普通混凝土应用于装配整体式叠合梁中,形成HPFRCC预制模壳装配整体式叠合梁构件,对其受弯性能进行试验研究。研究显示,U型HPFRCC预制模壳与后浇混凝土的粘结良好,没有明显的剥离;HPFRCC/RC装配整体式叠合梁峰值荷载和屈服荷载较普通整浇RC梁分别提高了17.2%和24.55%,与普通RC叠合梁相比,HPFRCC/RC装配整体式叠合梁的峰值荷载和屈服荷载分别提高了8.1%和5.59%;与普通RC整浇梁和普通RC叠合梁相比,HPFRCC/RC装配整体式叠合梁的裂缝密而细,裂缝开展速度及宽度也更小,说明HPFRCC材料能提高构件的耐损伤性。

To enhance the mechanical properties and damage resistance of prefabricated monolithic composite beams,this study introduces HPFRCC precast mold shells as a replacement for ordinary concrete in the construction of assembled monolithic laminated beams.These HPFRCC precast mold shell prefabricated monolithic composite beam members are then subjected to experimental investigations to analyze their flexural properties.The results of the study indicate that the U-shaped HPFRCC precast mold shell exhibits excellent bonding with the post-cast concrete,with no significant peeling observed.Moreover,compared to ordinary cast-in-place monolithic RC beams,the HPFRCC/RC assembled monolithic composite beams demonstrate a 17.2%increase in peak load and a 24.55%increase in yield load.Similarly,the HPFRCC/RC prefabricated monolithic composite beams show an 8.1%increase in peak load and a 5.59%increase in yield load compared to ordinary RC composite beams.In comparison to both ordinary RC monolithic beams and ordinary RC composite beams,the cracks observed in the HPFRCC/RC prefabricated monolithic composite beams are denser and finer,with a smaller crack development rate and width.These findings suggest that the incorporation of HPFRCC materials improves the damage resistance of the beam members.