两对边简支另两对边固支组合肋预制底板混凝土双向叠合板的简化塑性设计方法

Simplified Plastic Design Method for Two-way Composite Slab with Precast Combined Ribs Panelsand with Two Opposite Supported Sides and the Other Two Clamped Edges

目前组合肋预制底板混凝土双向叠合板(双向叠合板)已得到广泛应用.针对双向叠合板设计计算复杂的特点,基于塑性铰线法对两对边简支另两对边固支双向叠合板的设计计算进行了研究,推导出双向叠合板的极限承载力,确定塑性铰线位置,求解极限均布荷载和极限弯矩.采用极限平衡法对双向叠合板的极限弯矩求解公式进行了简化分析,得到极限弯矩的简化塑性计算公式.采用简化公式对2个算例进行求解计算,结果表明:对于两对边简支另两对边固支双向叠合板可采用文章的简化公式进行计算,简化后的塑性计算公式计算简便,有利于在工程设计中推广使用.

At present,the two-way composite with pricast combined ribs panal sand slab(two-way composite slab)has been widely used.In view of the complex design and calculation of two-way composite slab,the design and calculation of two opposite supported sides and the other two clamped edges two-way composite slabs are studied based on the plastic stranding method.The ultimate bearing capacity of the two-way composite slab is deduced and determined.The position of the plastic strand is determined,and the ultimate uniform load and ultimate bending moment are solved.The limit equilibrium method is used to simplify the analysis of the formula for the ultimate bending moment of the two-way composite slab,and the simplified plastic formula for the ultimate bending moment is obtained.A simplified formula is used to solve the two calculation examples,and the results show that the simplified formula of this paper can be used for the calculation of two opposite supported sides and the other two clamped edges two-way composite slab,and the simplified plastic calculation formula is easy to calculate.It is conducive to popularization and use in engineering design.