核能廠護箱基礎受震反應分析

淡江大學機構典藏 > 工學院 > 土木工程學系暨研究所 > 學位論文 > Item 987654321/87841

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题名:	核能廠護箱基礎受震反應分析
其它题名:	Analysis for seismic response of nuclear canister foundation
作者:	張皓凱;Chang, Hao-Kai
贡献者:	淡江大學土木工程學系碩士班張德文;Chang, Der-Wen
关键词:	SASSI2000;土壤-結構互制;波動方程;樁基礎;Soil-Structure Interaction;wave equation;pile foundation
日期:	2012
上传时间:	2013-04-13 11:47:50 (UTC+8)
摘要:	本研究係用SASSI2000 土壤~結構互制分析軟體，模擬核能廠混凝土護箱之受震反應，利用分析所得護箱質心及混凝土基礎版之加速度反應值判斷護箱於地震運動過程中是否有傾倒之可能性，以供後續護箱穩定性分析之研究討論，研究中將於樁基礎周遭加入樁周土壤元素以探討阻抗計算方式之改變對整體分析所帶來之影響，並簡化護箱分析模型，利用質點元素取代梁元素以模擬混凝土護箱，探討護箱結構慣性力於受震過程中對整體分析之影響性。最後，利用一維樁波動方程式EQWEAP，分析混凝土基礎版下樁基礎之受震行為，瞭解樁基礎於受震過程中樁身之變位情形和樁身彎矩、剪力值探討。分析中，配合利用Bouc-wen 模式以概略模擬樁身剛度之非線性行為，判斷樁身在不同地盤評估條件和地震運動方向輸入下之破壞機制。由研究結果顯示：(1)、在SASSI2000 分析中加入樁周土壤元素進行分析所得之結果，與國震中心(NCREE)進行比較，可發現加速度頻譜圖在各類地盤評估條件及地震運動方向之差異下其反應趨勢和顯著頻率發生區皆與國震中心大致符合，惟反應值因阻抗計算方式不同而有些微高低，護箱質心位置之加速度反應值差異皆約小於6% ；(2)、以質點元素簡化護箱模擬分析與原分析中護箱底座加速度反應值比較，分析結果會較原反應值放大約1%，可發現在此案例分析中，護箱結構慣性力對整體分析之影響性不大；(3)、本研究以一維樁波動方程為基礎，輸入與上述分析相同之土壤、結構模型參數進行分析，配合Bouc-wen 模式彎矩-曲率三線性關係瞭解樁身破壞機制，繪製樁身受震過程中之最大變位、彎矩、剪力之分佈狀況，由研究所得結果可發現，在較軟土層下，樁身會產生較大之位移量，且幾乎整體樁身都發生開裂破壞，在較硬土層分析下，則整體樁身皆保持於彈性狀態下，由分析結果顯示，樁身於受震過程中發生之變位量將隨著地盤硬度(土層剪力波速)之增加而有減少之趨勢。 This study uses soil-structure interaction analysis software SASSI2000 to analyze the seismic response of nuclear concrete canister. The acceleration response of the canister and the foundation is examined to determine whether there is rocking during seismic motion. The 3D Inter-Pile soil element is taking in this study to consider soil–pile interaction, and the lumped-mass element instead of beam element is adopted to simplify the canister model and to understand how structural inertia force influences the response result. Finally, using the 1D wave equation analysis EQWEAP for seismic response of the pile foundation, the displacement, bending moment and shear force of the pile can be achieved. An approximate Bouc-Wen model is used to obtain the nonlinear pile responses. The observations are summarized as follows: (1) Comparing the solutions with NCREE’s estimations, one can found that the acceleration spectrum are almost the same, the differences are within 6%. (2) For the comparison between the simplified canister model and the original model, one can find that the response value will be enlarged 1%, which shows that the structural inertia force has no significant effect in this case. (3) The pile analysis is based on the 1D wave equation with an approximate Bouc-Wen model. Tri-linear moment-curvature relationship is used to simulate the pile damages. As a result, the pile displacement will be increased in soft soil site, in that case the whole pile shaft has cracking damage. For piles in the stiff soil site, the pile displacement will be reduced and the pile shaft will remain at elastic condition. As showed by the results, the pile displacement will be reduced tremendously with the increase of soil stiffness (soil shear velocity). Therefore it is concluded that the site condition has a significant effect to the foundation responses in this case.
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