アンボンドPC圧着架構に適用する新PCa床スラブシステムの開発と架構の構造耐震性能に及ぼす影響

摘要

In this study, a new PCa floor system for an unbonded prestressed concrete (PC) frame structure was developed. Deformation of unbonded PC structure is expected to concentrate in the joint between beam and column and, as a result, damage to structural members can be reduced during an earthquake. Floor slab applied to these structures is need to be provided with not only sufficient in-plane shear transfer capacity but also system to avoid confinement of opening of beam-column joint. For this purpose, three types of new PCa slab-beam joint system were proposed and loading tests of full scale specimens were carried out. It was shown that shear stiffness and strength in new joint system with shear cotter joint were almost same with those in conventional half PCa floor slab. Moreover, static and dynamic analysis of prototype frame structure were carried out. Comparing analytical results considering deformation in proposed floor slab with rigid floor, applicability of new floor slab system was discussed.%本実験で得られた知見を以下に示す。1）美大スラブにおける静的加力実験の結果，フルPCaスラブ試験体ではシアコツター型（Sl）スラブが在来工法のハーフPCa型スラブ（別）と同等の耐力を有しており，要求性能を満たした。2）フルPCaスラブのS2，S3については，剛性・耐力ともに他の試験体と比較してかなり低く，また，施工性の面から考慮しても，今回提案したディテールでスラブとして導入するのは難しいと考　えられる。