现浇钢筋混凝土密肋空腔楼盖力学性能与计算方法

Mechanical Properties and Calculation Method of Cast-in-place Reinfored Concrete Dense Rib Cavity Ceiling

现浇钢筋混凝土密肋空腔楼盖DCKJ是由现浇密肋梁与预制混凝土空腔构件DCKQ组合而成,适用于大跨度结构的一种新型楼盖体系。本文通过竖向均布荷载作用下3×2空腔构件的楼盖模型试验,研究了现浇密肋梁、空腔构件间协同作用机理,得出了试件的破坏机理、力学性能。通过对试件的有限元计算,分析了空腔构件对试件刚度的影响,研究了拟梁法、查表法和有限元等多种计算方法计算该楼盖的合理性,提出了合理简化设计方法,理论计算结果与试验结果基本一致。研究成果可为该楼盖体系的设计、应用和研究提供参考。

The formulas for calculating the heights in the relaive compressive region and the area on the cross sections of RCB strengthened by the Pre-stresses Steel-plate are deduced based on the combination of the experiments and the plain cross section hypothesis. Then the formula of controlling tensile stresses in steel plates is induced with the limitations of load carrying capacities and deflections of the beam. Also the practical calculating instances are given at the end.