混凝土开孔梁变形的等效计算

由于现代建筑结构的高度日益增高，辅助设施也日见普遍，建筑物的开孔是有效的办法．但开孔梁或板的理论研究有其困难的一面，尤其是开孔后变形更无一般的算法．参考他人对混凝土开孔梁变形的研究结果，基于混凝土开孔梁变形特性，即变形曲线受孔的空腹桁架作用明显，变形曲线基本可以看成是同类型实心梁的变形与考虑孔空腹桁架作用产生变形的叠加，从而对由于开孔引起的刚度变化用相应实心梁进行模拟．通过计算相应实心梁的变形，就可以等效地计算出开孔梁的变形，从而给出混凝土开孔梁变形的一个简便而实用的算法．算例结果也表明此计算开孔梁变形的方法是有效的．

The Calculation of Deformation in Concrete Beams with Large Openings

Because of the increase of the height of contemporary architectural structures, auxiliary facilities become more common, and making openings in beams or blanks is an effective method. But it is difficult for the theoretical research of beams or blanks with openings, and especially there is no general way to calculate the deformation after making openings. Referring to others' research result of the deformation of concrete beams with large openings, and based on characteristics of rigidity and deformation for the concrete beams with large openings(i. e. the deformation line is greatly affected by openings), the deformation line can roughly be viewed as the sum of the deformation of the same kind of concrete beams and the deformation produced by the inertia of beams with openings. The paper has also disposed of the nonlinear for the inertia of beams with openings with a simulating method, and gives a simple and useful calculating method for RC beams with large openings. The result of the example indicates that the method is effective.