| 研究生: |
謝明宏 Hsieh, Ming-Hung |
|---|---|
| 論文名稱: |
木構造變溫炭化率預估模式之研究 Study on the modeling of charring rate for timber frames at variable temperature |
| 指導教授: |
曾俊達
Tzeng, Dr.Chun-Ta |
| 學位類別: |
碩士 Master |
| 系所名稱: |
規劃與設計學院 - 建築學系 Department of Architecture |
| 論文出版年: | 2010 |
| 畢業學年度: | 98 |
| 語文別: | 中文 |
| 論文頁數: | 172 |
| 中文關鍵詞: | 木構造 、耐火性能 、定溫炭化率預估模式 、變溫炭化率預估模式 |
| 外文關鍵詞: | Lumber Members, Wood Framing, Modeling of charring rate at constant temperature, Modeling of charring rate at variable temperature |
| 相關次數: | 點閱:196 下載:5 |
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木構造建築物木構材在高溫燃燒時表面會產生炭化層,其炭化層具有保護木構材內部不致受火害而影響結構之安全。在國科會研究計畫「木構造承重牆耐火性能驗證研究」 ,發現木構造框組壁式牆體內部間柱構件受火害之情形,所擷取之內部溫度呈現變溫曲線。
目前實驗加熱條件主要依據CNS12514「建築物構造部分耐火試驗法」以取得炭化深度,並透過炭化率預估模式之公式,進行各種材種炭化的預估,但對於木構材受熱條件為變溫曲線時,所能進行炭化深度的預估模式分析資料較少;本研究將透過分析與實驗的方式,探討木構造建築物木構材受熱條件為變溫時,其炭化率預估模式的可及性。研究具體成果包括:
一、定溫炭化率預估模式影響因子:
定溫炭化率影響因子為木構材基本特性(密度、含水率)與試驗條件(斷面尺寸、加熱溫度、加熱時間);特別木構材基本特性密度與含水率為炭化深度較不易掌控之因子;由試驗得知,木材影響因子中之含水率與密度兩者對其定溫炭化率預估模式之結果顯著;本研究試驗結果杉木含水率建議不可超過19.5%,雲杉建議不可超過17.5%。
二、驗證定溫炭化預估模式:
試驗量測之炭化深度與定溫預估模式比對後,雲杉炭化深度試驗數據與預估模式相近,而杉木與預估模式數據有落差。以導致杉木試驗數據與預估模式數值相差很大的因素,除了相關係數以平均值計算,另外也受杉木本身特性密度與含水率之影響。
三、變溫炭化率預估模式:
經確立變溫預估模式可及性後,結果得知,試驗變溫炭化深度數據與變溫預估模式之數據有些落差;進一步分析後發現,試驗木構材的含水率較試算的含水率偏高。
When lumber members of wood structure buildings heated high-temperature produce char layer on lumber surfaces that protect it from fire and keep structure safe. By the research, A study on the Test of the Fire Resistance Performance on Wood Building, cooperated with National Science Council, when internal pillars of wall of timber frame in wood framing construction, its temperature displays variable-temperature curve.
Now, fire conditions of experimental works, according to the fire resistance test for structural parts of building stated in the CNS 12514, obtain char depths; equations of modeling of charring rate obtain data on every kinds of lumber members. When a fire condition of lumber members is variable-temperature curve, it gets few analytic data of modeling of char depths. So, I’ll study lumber members on fire condition of modeling of charring rate by analyses and experiments. The result from this study refers to following paragraph:
1.Influence factors of Modeling of charring rate at constant temperature:
Two influence factors of charring rate at constant temperature are the fundamental characteristics (density and moisture) and experimental conditions (dimension section, fire-temperature and fire times); density and moisture of fundamental characteristics of special lumber members on char depths is uncontrollable factors. Depending on the experiment, density and moisture of lumber members produce a marked effect on Modeling of charring rate at constant temperature. On the basis of the result, it suggests moisture of China fir lower than 19.5% and Spruce-pine-fir lower than 17.5%.
2.Proof of Modeling of charring rate at constant temperature:
Contrasting the experiment of char depths and the anticipant model, experimental data of Spruce-pine-fir char depths is similar to anticipant model, but experimental data of China fir char depths is different with anticipant model. Two chief factors, causing China fin experimental data is different with anticipant model, are average of coefficients and density and moisture content of its fundamental characteristic.
3.Modeling of charring rate at variable temperature:
According to reliability analysis of Modeling of charring rate at variable temperature, in the event, experimental data of modeling of charring rate at variable temperature is different with anticipant model. After analyzing, moisture content of experimental lumber member is higher than calculation.
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