鄰近結構物之開挖工程為複雜之三向度問題，但以往在開挖分析中，常忽略鄰房結構物。若僅以自由場來評估開挖引致之地盤反應及建物損害，可能會低估實際情況。為獲得更貼近實際情況之結果，台科大研究團隊建立三維解耦分析方法(DAM)，並已針對獨立基腳與連續基腳之鄰房進行相關研究。本研究將針對板式筏基之鄰房進行開挖引致之土壤-結構互制行為探討。
本研究擬建立一套板式筏基之鄰房解耦分析方法，以土壤彈簧模擬開挖引致之土壤-結構互制行為。在結構配筋設計時，將結構模型拆解為上部結構與下部結構，並依照載重組合進行結構配筋設計。本研究將比較開挖引致之板式筏基與獨立基腳之結果，以及以不同地震力大小設計之結構鋼筋設計之解耦分析結果。
本研究結果顯示，解耦分析方法可應用於板式筏基。開挖引致板式筏基之損害較獨立基腳小，板式筏基受開挖影響後無塑性鉸發生，獨立基腳則發生30個塑性鉸。隨著考量的地震力越大，開挖引致鄰房結構物之損害就越小。因此開挖引致建物之損害，不只與基礎型式有關，也與設計時考量的地震力大小相關。最後彙整分析結果，以鄰房角變量建立結構損害之關係，以供工程實務應用。

The actual situation of excavation with the adjacent building is a complex three-dimensional problem. However, the influence of the adjacent building was usually ignored. The method by using the greenfield to evaluate the ground response and the building damage is not accurate. The potential damage may be underestimated. In order to get better analytical results, the three-dimensional Decoupled Analysis Method (DAM) was developed. Previous studies have already been conducted on spread footing and continuous footing. This study aims to evaluate the ground response and building damage potential of the adjacent building with mat foundation induced by the excavation.
This study intends to establish a decoupled analysis method of mat foundation using soil springs to simulate the interaction between soil and structure. In reinforcement design, the structure is separated into the superstructure and the substructure. Besides, proper loading combinations are considered in the design.
The results of the mat foundation are compared with the results of the spread footing. The results of structural reinforcement design with different seismic force are also studied.
Results show that the decoupled analysis method for the mat foundation is feasible. The excavation induced effects on the adjacent building of the mat foundation is less severe than that of the spread footing. The mat foundation structure exhibits no plastic hinge. However, the spread footing structure suffers 30 plastic hinges. The smaller building damage potential is observed when a larger seismic force is considered in the reinforcement design. Therefore, the building damage induced by the excavation is not only related to the foundation type but also related to the magnitude of the seismic force considered in the reinforcement design. Finally, the analytical results are summarized to develop the relationship of angular distortion and building damage for engineer application.

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