Research on the Charring Rate of Cross Laminated Timber Structural

Abstract

<p>本研究透過蒐集歐洲、北美、日本等地有關直交集成板CLT之構造防火法規與規範，以直交集成板CLT之構造耐火試驗及防火特性進行探討研究，並針對木構造建築物設計及施工技術規範〔1〕提出有關直交集成板CLT構造增修建議。預計進行2組CLT樓板及2組CLT牆板之耐火實驗，探討做為驗證所需。實驗試體使用5層15cm日本扁柏CLT(符合JAS規定)〔2〕及5層12cm日本扁柏加柳杉(符合JAS規定)〔2〕分別進行樓板與牆各1小時及2小時之耐火實驗。CLT實驗試體經耐火試驗後，進行炭化層之刮除以確認炭化深度及炭化速率。 CLT實驗試體加熱面經清除炭化層後所殘留之結構斷面，以每100mm距離量測其縱向及橫向炭化深度值，將量測之炭化深度及炭化速率結果，以日本木材炭化率預估模式〔3〕，藉由公式之計算與實際實驗後所得到之炭化深度交叉比對分析，利用實驗數據與預估模式之相關係數討論公式預估之準確性，提出炭化深度防火規定建議值，以作為木構造結構設計之依據。</p> <p> </p><p>This research is collecting about the fire regulations and codes for the construction of Cross Laminated Timber of CLT in Europe, North America, Japan, and discussion and research on the structural fire resistance test and fire characteristic execute of the Cross Laminated Timber CLT, and according to the reference manual for fire design and construction of wooden structures, suggestions on the addition and repair of the CLT structure of the Cross Laminated Timber are proposed. It is expected to execute the fire resistance test of 2 sets of CLT floor and 2 sets of CLT wall to discuss for verification. The test specimens used 5 layers of 15cm Japanese cypress CLT (in compliance with JAS regulations) and 5 layers of 12cm Japanese cypress and Cryptomeria (in compliance with JAS regulations) to execute fire resistance tests for the floor and wall for 1 hour and 2 hours. After the CLT test specimen to the fire resistance test, the charring layer is scraped to confirm the charring depth and the charring rate. After the charring layer has been clearing for structural section of the CLT specimens heating surface, and the longitudinal and transverse charring depth values are measured every 10cm. The charring depth and charring measurement rate results are by the Japanese wood charring rate prediction model, it is calculated by the formula and cross-compared analyzed with the charring depth obtained after the practical experiment. Use the correlation coefficients of test data and estimation models to discuss the accuracy of the predictions, and serve as a reference for the design of wooden structures for future reference revisions.</p> <p> </p>