【摘要】 为系统研究开洞对预应力混凝土空心板的抗弯承载力的影响，针对三种不同截面高度的空心板进行抗弯试验和数值模拟。通过改变开洞位置、截面高度和是否伤及钢绞线三个因素进行抗弯试验研究。采用ABAQUS有限元模拟软件进行洞口尺寸和板腹孔洞处开洞的参数分析。研究表明：空心板抗弯承载力的削弱程度与开洞位置、截面高度密切相关，180 mm厚空心板局部切中肋开洞时抗弯承载力影响最大，降低30%以上，而100 mm和120 mm厚空心板则是局部切边肋开洞危害更大；洞口宽度与削弱程度呈正比，三种逐级递增的洞口宽度分别降低空心板20.9%、26.5%和36.8%的极限承载力，甚至会改变空心板的破坏模式，而适当延长洞口长度则影响不大；开洞伤及钢绞线会明显降低空心板抗弯承载力，在板端或板腹不伤及钢绞线时开洞对其抗弯承载能力影响较小，与完整板的抗弯极限承载力相比差值仅在5%以内。更多还原

【Abstract】 In order to systematically study the flexural bearing capacity of prestressed concrete hollow slabs with opening, flexural tests and numerical simulations were conducted on hollow slabs with three different cross-sectional heights. Three factors are considered in the flexural tests: opening location, cross-sectional height, and whether the steel strand is damaged. The finite element model was established by ABAQUS software to analyze the influence of hole size and opening at the center of the hollow slabs. Research indicates the weakening degree of the flexural capacity of the hollow slab is closely related to the location of the opening and the height of the section. The 180 mm thick hollow slab has the greatest influence on the flexural capacity when the local cutting rib is opened, which is reduced by more than 30%, while the 100 mm and 120 mm thick hollow slabs are more harmful to the local cutting rib opening. The width of the hole is proportional to the degree of weakening. The three increasing hole widths reduce the ultimate bearing capacity of the hollow slab by 20.9%, 26.5% and 36.8% respectively, and even change the failure mode of the hollow slab, while the appropriate extension of the hole length has little effect. The opening damage and the steel strand will significantly reduce the flexural capacity of the hollow slab. When the end of the slab or the web of the slab does not damage the steel strand, the opening has little effect on the flexural capacity of the hollow slab. Compared with the ultimate flexural capacity of the intact slab, the difference is only within 5%.更多还原