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題 名 | 剛性基腳之旋轉性能曲線與工程設計考量=Analytical Rotational Performance Curve of a Rigid Footing |
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作 者 | 邱俊翔; 柯永彥; 黃俊鴻; 陳正興; | 書刊名 | 地工技術 |
卷 期 | 140 2014.06[民103.06] |
頁 次 | 頁79-86 |
專 輯 | 都會區工程開挖案例 |
分類號 | 441.17 |
關鍵詞 | 獨立基腳; 性能曲線; 彎矩強度; 降伏點; Rigid footing; Performance curve; Moment resistance; Yield point; |
語 文 | 中文(Chinese) |
中文摘要 | 獨立基腳或擴展基礎之旋轉反應是工程設計之主要檢核項目之一,本文應用溫克基礎模式推導其受彎矩作用所產生旋轉角之無因次解析解,包括地盤情況為彈性土壤與完全彈塑性土壤兩種情況。根據解析解所得性能曲線之特性,藉以檢討現行設計規定之合理性,並建議簡化之性能設計曲線,供工程分析參考使用。研究結果顯示工程設計時獨立基腳之降伏點可取接觸面積減為50%之情況,性能曲線超過此點之斜率變得非常平緩,基礎彎矩強度隨旋轉角加大之增幅不大,而軸力為基腳彎矩強度之重要影響因子,其中小軸力之設計載重條件為較不利之情況。 |
英文摘要 | The rocking response of a footing or spread foundation is essential to its stability and performance. The analytical dimensionless performance curves of a rigid footing are presented in this paper for the cases of elastic and elastoplastic soils. Based on that, performance-based design criteria for the rotational response of a rigid footing are suggested for engineering applications. The rotational yield point of a footing shall be set at the condition when the foundation contact area has been reduced to 50% of the total foundation base area. Beyond this point, the slope of the performance curve becomes very gentle, so the moment resistance of the footing cannot increase much with respect to larger rotations. In addition, the axial force is an important factor influencing the rotational resistance of the footing, in which the case with low axial force is a disadvantage design condition. |
本系統中英文摘要資訊取自各篇刊載內容。