考虑开洞的现浇混凝土空心楼盖经验系数法

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中图分类号：TU375 文献标志码：A DOI： 10.15935/j.cnki.jggcs.202504.0001

AbstractOpenings are often used in cast-in-situ concrete holow floors and the current direct design method does not consider the influence of the openings.In this paper，27O case studies on 3x3 span box filler hollow floors with openings were analyzed using software ABAQUS.The effcts of four parameters on the moment distributions of the hollw floors were investigated，i.e.，the opening position，opening area ratio，slab span ratio andthe beam-slab relative flexural stiffness ratio.The obtained results included the moment distribution coefficients for control sections of the floor strips，as well as the moment distribution coeficients forcolumn strips.These results were also compared with the coefficients recommended by the code.It was found that the opening in the hollow floor weakened the section stifness at the opening position，reduced the moment distribution coefficients of the section，and consequently increased the moment distribution coeficients of other sections.In the presence of an opening，the recommended values in the code are appropriate for the moment distribution coefficients for control sections of both the interior and end span.However，the moment distribution coeficients forthe column strips in the code are not applicable and it is recommended to adopt the moment distribution coefficients proposed in this paper for the column strips，which account for openings.

Keywordshollow floor，direct design method，opening，moment distribution coeficient，finite element analysis

0 引言

现浇混凝土空心楼盖具有板厚小、自重轻、刚度大等特点，应用于建筑结构中可达到节省层高、增加净高、节约成本等目的，故常用作大跨度和大空间结构的楼板。（剩余9584字）