過去在開挖分析中，常忽略鄰房結構物，僅以自由場分析結果評估開挖引致之地盤與結構物反應，則可能會低估結構損害。為使結果更貼近實際情況，本研究以三維解耦分析方法(DAM)模擬一半獨立基腳一半筏式基礎之複合式基礎之鄰房，探討開挖引致之土壤與結構互制行為。
本研究建立複合式基礎結構物之解耦分析，下部結構具有不對稱之特性，其上方結構物更易因差異沉陷而受損，且在兩不同基礎型式之交界處也是值得探討的課題。本研究將精進過去研究團隊所建立之獨立基腳及板式筏基模型，並比較三種不同基礎型式受開挖引致之地盤反應與結構物變形行為，以及採用不同設計地震力時之分析結果。
研究結果顯示，複合式基礎結構物受開挖引致之損害介於獨立基腳與板式筏基之間。在設計地震力為V=0.2W的條件下複合式基礎開挖後所產生的塑性鉸有13個，獨立基腳與板式筏基分別為23與0個。且複合式基礎由於下部結構不同，在其交界面雖然沒有塑性鉸發生卻產生很大軸力。隨著以較大地震力設計的房屋，開挖後引致之建物損害越小，因此鄰房之基礎型式與設計時所採用之地震力大小，都會影響建物損害程度。最後彙整研究結果，建立鄰房角變量與結構物損害之關係，以供工程應用參考。

The influence of the adjacent building on excavation was usually neglected in the past. The method by using the greenfield results to evaluate the ground response and the building damage is not accurate, and may underestimate the structural potential damage. In order to make the analytical results closer to the actual situation, the three-dimensional Decoupled Analysis Method (DAM) was developed. This study focused on the adjacent building with mixed foundation as the research object, which is half spread footing and half mat foundation. The interaction between soil and structure caused by the excavation was studied.
The study developed a decoupled analysis procedure of the mixed foundation structure. The substructure has asymmetrical characteristic and the superstructure is more susceptible to damage due to differential settlement. The interface of two different foundation types is also the focus of this research. This study will also refine the spread footing and mat foundation model established in the past. This study compares and assesses the ground response and the structural deformation behavior caused by excavation with three different foundation types. The effects of using different seismic force to design the structural reinforcement are also studied.
The research results show that the damage potential of the mixed foundation structure caused by excavation is between the spread footing and the mat foundation. After excavating the mixed foundation structure suffered 13 plastic hinges if the seismic design force is V=0.2W. The spread footing and the mat foundation structure suffered 23 and 0 plastic hinges respectively. In addition, the substructure of mixed foundation exhibited a large axial force at the interface even though there is no plastic hinge. When the structure is designed with larger seismic force, the building damage potential caused by the excavation is smaller. Therefore, both the foundation type of the adjacent building and the magnitude of the seismic force used in the reinforcement design will affect the potemtial damage of the building induced by excavation. Finally, the analytical results are summarized to establish the relationship between the bay angular distortion and the structural damage for engineering application.

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