混凝土简支叠合梁的跨中内力和配筋计算方法

叠合梁的配筋计算方法是叠合结构计算中最为重要而又尚未很好解决的一个问题．本文研究了无施工支撑混凝土简支叠合梁跨中受力区别于整体梁的各种特性，分析了形成这些特性的本质原因．研究结果表明，叠合前后受力的梁的两部分截面高度不一致导致了叠合梁与相应整体梁受力性能的差异；而叠合后受力过程中的截面塑性应力重分布及相应的弯矩转移则起着缓解、缩小这一差异的作用．文中提出的内力及配筋计算方法反映了叠合梁的这些特性，而且计算简便，计算结果比较合理．

CALCULATING METHOD OF THE INTERNAL FORCE AND REINFORCEMENT OF RC COMPOSITE BEAMS IN THE MIDDLE SECTION

The calculating method of the reinforcement of composite beam is the most important problem in composite constructions,but it has not been solved well up to now.In this paper,various mechanical properties of the simple supported composite beam without construction support which is different from casting beam have been investigated.The intrinsic reason which leads to those properties has also been analyzed.The results of the investigation show that discrepancies of mechanical behaviors between the composite beam and the corresponding casting beam are due to the discrepancy of the sectional depth between the loaded composite beam and the prior prefabricated beam.The plastic redistribution of section stress and the transition of corresponding moment can modify or reduce the discrepancy after the composite beam is loaded.The calculating method of internal force and reinforcement which have been presented in this paper revealed those properties of the composite beam.Moreover,the calculation is convenient and the result of the calculation is justifiable.