本研究探討台灣國內既有鋼筋混凝土（RC）建築物的耐震補強問題。有鑑於私有住宅採用RC剪力牆進行耐震補強工法之影響，本研究提出直交集成板（Cross Laminated Timber, CLT）補強工法，針對RC韌性構架填充CLT牆受火害之情境進行實驗與分析驗證工作。
研究變數主要包括：RC震損構架（SDBNF試體）、CLT牆之火害防護方式（有石膏板FG試體、無石膏板FNG試體）、CLT牆型式（全牆RW試體、翼牆RWW試體）。CLT板材質為歐洲雲杉、厚度12 cm。火害條件為符合CNS 12514，火害延時1小時。所有試體於國家地震工程研究中心組裝，並在BATS平台進行靜態反覆載重測試。
實驗結果顯示，CLT無石膏板（FNG試體），及CLT有石膏板（FG試體），在層間位移角2%時，水平剪力分別可達771 kN與742 kN。受力初期雖會因連接件與板材間之細微空隙產生局部滑移，但隨著位移增加使施工縫間隙閉合後，CLT之側向抗力隨即被啟動，進而使結構強度獲得顯著提升。
震損構架SDBNF試體經全牆補強（RW）後，其最大水平剪力大幅提升至1073 kN，相較於震損構架提升約達2.6倍；翼牆補強試體（RWW）其最大水平剪力可提升至628 kN，且層間變位角可達6%之大位移。由裂縫發展分析可知，此補強方法在RC構架在大位移角進入混凝土壓碎階段時，CLT板補強能有效分散其側向力，有效防止倒塌並顯著延長震後安全性。
在數值分析方面，本研究建構之「等值雙斜撐搭配塑性鉸模型」能精確捕捉CLT補強於各狀態下之非線性側推特徵，證明此技術具備高度預測準確性，可作為既有建築結構修復與補強之參考。

This study investigates the seismic retrofitting of existing reinforced concrete（RC）buildings in Taiwan. Considering the impact of using RC shear walls as a seismic retrofitting method for private residential buildings, this study proposes a Cross Laminated Timber（CLT）retrofitting method. Experimental and analytical verification was conducted for the scenario of fire-damaged RC ductile frames infilled with CLT walls.
The main research variables include: an earthquake-damaged RC frame specimen（SDBNF specimen）, fire protection methods for the CLT wall（FG specimen with gypsum board and FNG specimen without gypsum board）, and CLT wall configurations（RW specimen with a full wall and RWW specimen with wing walls）. The CLT panels were made of European spruce with a thickness of 12 cm. The fire exposure condition complied with CNS 12514, with a fire duration of one hour. All specimens were assembled at the National Center for Research on Earthquake Engineering and tested under static cyclic loading using the BATS platform.
The experimental results showed that the CLT specimen without gypsum board（FNG specimen）and the CLT specimen with gypsum board（FG specimen）achieved horizontal shear strengths of 771 kN and 742 kN, respectively, at a story drift ratio of 2%. In the initial loading stage, local slip occurred due to slight gaps between the connectors and the panels. However, as the displacement increased and the gaps at the construction joints closed, the lateral resistance of the CLT wall was activated, thereby significantly enhancing the structural strength.
After the earthquake-damaged frame specimen（SDBNF specimen）was retrofitted with a full CLT wall（RW）, its maximum horizontal shear strength increased significantly to 1073 kN, representing an improvement of approximately 2.6 times compared with the earthquake-damaged frame. The specimen retrofitted with CLT wing walls（RWW）achieved a maximum horizontal shear strength of 628 kN and sustained a large story drift ratio of up to 6%. Based on the crack development analysis, this retrofitting method effectively distributed the lateral force when the RC frame entered the concrete crushing stage under large drift ratios. As a result, it effectively prevented collapse and significantly prolonged post-earthquake structural safety.
In terms of numerical analysis, the equivalent double-strut model combined with plastic hinge modeling developed in this study accurately captured the nonlinear pushover behavior of CLT-retrofitted specimens under different conditions. The results demonstrate that this technique provides highly accurate predictions and can serve as a reference for the repair and seismic retrofitting of existing building structures.

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