一种双孔空心预制梁抗弯性能试验

Bending Resistance Experiment of Double-hole Hollow Precast Beam

针对空心预制梁受力变形及裂缝分布等问题,分别对3根双孔空心预制梁和1根实心预制梁(对照)进行了试验。采用静力加载方法,对比分析了空心预制梁和实心预制梁的试验过程描述、破坏形态、荷载-挠度曲线、跨中截面变形、承载力和开孔对预制梁的影响。研究结果表明:双孔空心预制梁在受力变形过程中,可以优化其受力的传递路径和规律,减少应力集中。通过与同尺度构件计算对比得到,双孔空心预制梁原材料用量比实心预制梁减少了36.41%;双孔空心预制梁的开裂荷载比实心预制梁提高了约41.79%,开双孔对普通预制梁前期开裂具有一定的延缓作用。

Aiming at the problems of stress deformation and crack distribution of hollow prefabricated beams,three double-hole hollow precast beams and a solid comparative beam were tested.The static loading method was adopted to compare the performance indicators of hollow prefabricated beams with solid prefabricated beams,such as test process description,failure morphology,load-deflection curve,mid-span deformation,bearing capacity and influence of opening.The research results show that the double-hole hollow prefabricated beam optimizes and improves the force transmission path and law during the stress deformation process,and reduces the stress concentration.Through the calculation and comparison of the same-scale members,the raw material consumption of the double-hole hollow prefabricated beam is reduced by 36.41%.The cracking load of the double-hole hollow prefabricated beam is increased by about 41.79%compared with the solid beam.Double opening hole has a certain delay effect on the early cracking of ordinary prefabricated beams.