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321Photography｜1：篠澤建築写真事務所／SHINOZAWA Architectural Photo Office2–3：日建設計／Nikken Sekkei密集した鉄骨構造材（白色）の隙間に空調吹出口（黄色）を配置しているe HVAC outlet ducts (yellow) are located among the dense web of steel frame members本事業では、既存天井を撤去し、新しい天井を再構築する方法を採用。また、新天井の設計にあたっては、今日の新築ホールで実績の多い、鉄骨構造材に直接天井下地材を設け、地震時に天井自体が揺れず脱落しない工法（非吊天井、準構造天井）を用いた。BＩＭにより、構造部材とダクトなどの設備機器の位置関係の詳細検討を行った。We removed the existing covering and installed a new ceiling. e redesign adopts a method commonly used today for new auditoriums with ceiling supports connected directly to steel structural members. is non-suspended, seismic-resistant structure eliminates ceilings that can swing or fall during earthquakes. Structural members were studied in detail using BIM to determine placement of ducts and other building services equipment.BIMを用いた構造と設備の位置検証モデルの例Example of model for structure and building services location using BIM1 :改修後の大ホール客席。｜2 : 改修前の天井下地材。｜3 : 改修後の天井構成（鉄骨構造材＋下地材）。1 : Large auditorium seating aer renovation. ｜2 : Ceiling support before renovation. ｜3 : Ceiling composition (steel structural members and supports) aer renovation.天井耐震化の方策│Making the Ceiling Resistant to Seismic Stress232019 AUTUMN40Feature | WORKS