解耦分析（DAM）已成功地用於評估鄰房為獨立基腳、筏式基礎及Spread-Mat基礎的開挖後的土壤開挖行為。本研究中分析了具有Mat-Spread複合式基礎的鄰房，並建立Mat-Spread基礎的DAM數值模型。靠近開挖側為一半基礎為筏式基礎，另一半為獨立基腳。Mat-Spread基礎的建模有兩種不同於Spread-Mat的方式，第一種修改是為以滾支承作為Mat-Spread基礎中筏式基礎部分的支撐，第二種修改是使用相對橫向位移代替絕對橫向位移。本研究比較和評估了兩種複合式基礎的開挖引起的土體反應和結構物反應。
研究結果顯示，對於設計地震力V = 0.2W，開挖後Spread-Mat基礎產生了13個塑性鉸，而Mat-Spread基礎沒有產生塑性鉸。在Spread-Mat基礎之下部結構的第一層上出現很大的拉力，超過了開裂極限。對於Mat-Spread基礎也出現雖然拉力，但仍在該極限拉力內。最後對分析結果進行總結，以建立鄰房角變量與結構損害之間的關係，以供工程上之應用。
PLAXIS 3D (2017) 可用於開挖和鄰房的耦合分析，並使用彈塑性模型對鄰房進行建模。 結果顯示，對於現地場反應其趨勢與解耦分析一致。但對於結構物反應，耦合分析結果與預期的結構行為不一致。 因此，結構物反應之耦合分析需要再大幅改進，才能用於工程應用上。

Decoupled Analysis Method (DAM) has been successfully applied to evaluate excavation with adjacent building, including the mat foundation, the spread foundation and the Spread-Mat foundation. In this study, the adjacent building with the Mat-Spread mixed foundation is analyzed. Half of the mixed foundation closer to the excavation is mat foundation and the other half is spread footing. The numerical model of DAM for the Mat-Spread foundation is developed. The modelling of the Mat-Spread foundation is different from the Spread-Mat foundation. There are two modifications, first rollers are used as the supports for the mat foundation part in the Mat-Spread foundation. Second, the relative lateral displacement is used instead of absolute lateral displacement. This study also compares and assesses the site response and building response caused by excavation with two types of mixed foundation.
The research results show that after excavation, for seismic force V=0.2W, the Spread-Mat foundation produced 13 plastic hinges while the Mat-Spread produced no plastic hinges. The substructure of the Spread-Mat foundation exhibited a large tensile force on the first floor that exceeded the cracking limit. The Mat-Spread foundation also exhibited tensile force but still within the limits. Finally, the analytical results are summarized to establish the relationship between the bay angular distortion and the structural damage for engineering application.
The coupled analysis can be conducted using PLAXIS 3D (2017) to model the excavation and the adjacent building with the elastoplastic model. The results show that for the site response, the trend is consistent with the decoupled analysis. For the building response, the coupled analysis results are not consistent with the expected structure behavior. Thus, the coupled analysis of the structure response needs much improvement before it can be used for engineering application.

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