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在现代建筑工程中,吊顶上空要容纳管道。通过楼板梁中的孔洞穿越管道,可以明显减少无效空间而使设计较紧凑、经济。然而必须考虑开孔对梁强度和性能的影响。弯剪作用下大开孔梁的若干研究在文献中已作了报导。孔洞上下杆件(弦杆)的性能就象空腹格板一样,其反弯点位于弦杆的中点。因此,梁孔洞处的脱离体图形可表示为图1的形式。外弯矩由弦杆中拉、压应力的合力来抵抗,而外弯矩可容易地由平衡条件确定。若每
In modern construction projects, pipes are to be accommodated above the ceiling. Passing through the pipes through the holes in the floor beams can significantly reduce the ineffective space and make the design more compact and economical. However, the effect of the opening on the strength and performance of the beam must be considered. Several studies of large opening beams under bending and shearing have been reported in the literature. The performance of the upper and lower member (chord) of the hole is like that of the open lattice panel, and its anti-bending point is located at the midpoint of the chord. Therefore, the relief pattern at the beam hole can be represented as the form of FIG. The external bending moment is resisted by the combined force of the tensile and compressive stresses in the chord, while the external bending moment can be easily determined by the equilibrium conditions. If every