本研究團隊過去已成功地應用三維解耦分析方法針對開挖引致之不同基礎型式之鄰房損害行為進行深入探討，但鄰房角變量與地表沉陷之量化關係僅有初步之心得，仍值得進一步研究。本研究主要分為兩大主軸，第一項主軸為將三跨結構物放置於4 種不同沉陷槽位置，根據三維解耦分析結果深入探討鄰房角變量行為，然後檢討現有現地評估鄰房損害方法，並提出改進建議。第二項主軸為以獨立基腳與板式筏基之基準結構物模型，分別進行15 種不同鄰房位置之三維解耦分析，綜整所有分析結果並探討自由場角變量及基腳角變量與距離之關係，然後建立角變量比值與正規化距離關係式。
第一項主軸之研究成果顯示，不論任何沉陷槽位置，鄰房結構物的基腳角變量皆大約等於跨間角變量，而多數沉陷槽位置之基腳角變量幾乎都與層間角變量無關。工程實務上利用層間角變量評估鄰房損害行為，可能會誤判實際結構損壞潛勢。改進方式可參考本研究提出II
之以經緯儀及傾度盤量測跨間角變量之方法。第二項主軸之研究成果顯示，獨立基腳與板式筏基之基腳角變量與自由場角變量，皆隨距離增加而有特定之變化趨勢。獨立基腳基腳角變量幾乎都大於自由場角變量，而板式筏基的基腳角變量幾乎都小於自由場角變量，若使用自由場角變量評估結構物安全性，會有誤判之虞。為解決此問題，本研究最後提出利用自由場角變量評估基礎角變量之方法，建立角變量比值與正規化距離之關係式，並以MAPE 驗證得知不同關係式皆具有良好預測的能力。

The 3D Decoupled Analysis Method (DAM) has been successfully
applied to study the excavation-induced adjacent building damage
behavior of different types of foundation in the past few years by our
research team. However, the study is only preliminary about the angular
distortion behavior of the adjacent building and its quantitative relationship
with ground settlement. This issue is worthy of further study. This study is
mainly divided into two research parts. First part is to use DAM to
investigate the angular distortion behavior of the three-span structure at 4
different locations adjacent to the excavation. Then, the analytical results
are used to review and improve the current methods of in-situ measurement
of the adjacent building damage. Second part is to place the baseline
structure of spread footing and mat foundation at 15 different locations and
to analyze the excavation-structure interaction using DAM respectively.
The results are used to study the relationship between the greenfield
settlement and the bay angular distortion of the adjacent structure. As a
IV
result, quantified relationships are developed to evaluate the relationship
between the ratio of angular distortion and the normalized distance.
The research results of the first part show that, regardless of the
adjacent building location, the bay angular distortion is approximately
equal to the span drift ratio. In addition, the bay angular distortion has no
relation with the story drift ratio. In practice, using the story drift ratio to
evaluate the damage of the adjacent building may misjudge the actual
damage potential. This research proposes an improvement method of
measuring the span drift ratio using theodolite and tilt plate. The research
results of the second part show that, the greenfield angular distortion and
the bay angular distortion of spread footing and mat foundation exhibit
specific trends changing with the distance. The angular distortions of the
spread footing are mostly larger than the greenfield angular distortions, but
the angular distortions of the mat foundation are mostly smaller than the
greenfield angular distortions. If the greenfield angular distortion is used
to evaluate the safety of the adjacent structure, there is a risk of
misjudgment. To solve this situation, this research proposes a method for
evaluating the bay angular distortion using the greenfield angular distortion.
Three types of the relationship between the angular distortion ratio and the
normalized distance are proposed. Their good predictive abilities are
verified using the MAPE index.

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