既設駅舎の天井改良工法選定のための耐震設計法

摘要

過去の地震において多くの一般建築物で吊り天井の崩落事故が発生した。鉄道駅は不特定多数の方が利用されることから，駅舎天井にはこのような地震被害を防止するために耐震安全性を確保することが重要である。一方，平成25年7月に建築基準法が改正され，一定条件の天井（以下，特定天井）に対する脱落対策の規定が追加された。また，同年10月および平成28年7月には「建築物における天井脱落対策に係る技術基準の解説」（以下，天井技術基準）が示され，改正建築基準法の解釈や技術上の留意事項が取りまとめられた。%The ceiling of stations has support - structural types different from those which the ceiling of general buildings has. For example, the case where the ceiling is hanged from the waterproof folded plate to prevent water leakage as is often the case with elevated stations, and the case where the ceiling is hanged from horizontal structural members such as the channel steel as is often the case with over - track buildings can be cited. For the evaluation of the seismic performance of the ceiling of stations, it is required that the structural performance of the support part of the ceiling is grasped. And it is required that the load acting on the ceiling during earthquakes is adequately evaluated. Shaking table tests and analytical studies of the suspended ceiling in consideration of the support part of existing stations are conducted. Seismic design for the improvement construction method of the ceiling of existing stations is proposed.