為評估地震所引致地表破裂對地下管線之影響程度，本研究以運算成本較低之溫克基礎模式(Winkler’s foundation)進行管-土互制分析，以梁元素模擬管線，以彈塑性彈簧元素模擬管周土壤提供之阻抗，地表破裂造成之地盤錯動則以強制位移模擬。根據分析所得沿管身之彎矩、剪力、軸力、轉角及位移分佈，探討地下管線受地表破裂作用下之行為特性；進一步根據ANSI/AISC 360-22鋼結構建築物設計規範針對中空結構斷面(hollow structural section, HSS)構材之強度評估準則，檢核管線是否發生破壞及主控破壞型態。為進行模式測試與驗證，採用2018年花蓮地震與2022年關山-池上地震中之地下自來水管線破壞案例，由震後調查報告歸納出地表破裂之各方向錯動量，以SAP2000結構分析軟體程式建立模型進行分析，並與管線實際破壞情形比較，證明評估結果尚屬合理。進一步針對管周土壤強度與地盤錯動方向性兩項參數進行研究，前者可做為管周回填料的選用參考，後者則是為了了解管線對不同方向地盤錯動的抵抗能力差異。本研究之成果可應用於既有地下管線之震損風險評估，並可供設計管線時提升抗震性能的參考。

To assess the impact of earthquake-induced ground rupture on buried pipelines, this study adopted the computationally efficient Winkler’s foundation model for pipeline-soil interaction analysis. The pipeline is modelled using beam elements, while the surrounding soil resistance is represented by elastic-plastic spring elements. The ground offset caused by ground rupture is simulated through the imposed displacement. Based on the resulting bending moments, shear forces, axial forces, rotations, and displacements along the pipeline, the behavior of buried pipelines subjected to ground rupture effects can be investigated. Furthermore, the integrity of the pipeline is assessed and the dominant failure mode is determined according to the design criteria for hollow structural section (HSS) members specified in the ANSI/AISC 360-22 Specification for Structural Steel Buildings.To test and validate the adopted methodology, case studies on damages of buried potable water pipelines in the 2018 Hualien earthquake and the 2022 Guanshan-Chishang earthquake were analyzed. The ground offset in various directions were extracted from post-earthquake investigation reports, and structural models for analysis were built by SAP2000. Additionally, parametric studies were conducted on two factors: the strength of the surrounding soil and the directionality of ground displacements, which are beneficial to the selection of backfill materials and the understanding pipeline resistance to ruptures with different offset directions, respectively. The findings of this research can be applied to the seismic risk assessment of existing buried pipelines and serve as references for improving the seismic performance in the design of pipeline systems.

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