陳清泉臺灣大學：土木工程學研究所陳怡如Cheng, Yi-RuYi-RuCheng2007-11-252018-07-092007-11-252018-07-092007http://ntur.lib.ntu.edu.tw//handle/246246/50388摘要 本文主旨在探討桁架式鋼構架之耐震能力研究 ，利用擬彈性分析方法，將構架超過彈性範圍之行為，以能量守恆原則，分析構架之非線性反應行為，進而評估結構於非線性行為下之耐震能力。 構架耐震能力之分析，藉由現有結構分析程式，如SAP進行結構分析，得到各構件之內力，然後逐步放大地震力。當構架中構件端部產生塑性鉸後進入非線性反應，假設儲存於結構內之總體應變能不變，依能量守恆原理進行擬彈性分析，而主要將各構件超過軸力彈性限度之應變能置換成塑性應變能，進而求得構架所能承受之極限基底剪力和最大側位移，以評估結構之耐震能力，並求出其對應崩塌加速度。 本文針對桁架式鋼構架及等值鋼剛架作實例分析比較，利用SAP程式中非線性靜力側推分和擬彈性能量守恆法分析結果做一完整比較。深入研究桁架式鋼構架耐震能力，經研究結果均能獲得合理結果，以供學術及設計實務之參考。Abstract The objective of this paper is to investigate the seismic capacity of the truss type steel frame by adopting Pseudo-elastic approach. In according to the principle of energy conservation to transfer the energy which exceeding the elastic range into plastic energy, the nonlinear response of the structure, and the seismic capacity of the structure can be figured out. There are several procedures to analysis truss type steel frame of seismic capacity. Firstly, the structure will be analyzed linearly by adopting SAP software, and the member forces are carried out. The lateral force will be enlarged gradually. After the first plastic hinge appeared, the truss type steel frame will perform inelastic. In according to the conservation principle, the energy exceed the elastic strain energy can transferred into the corresponding plastic energy by using Pseudo-elastic method from linear analysis. Finally, the yielding lateral force, ultimate lateral force, ductility, and collapsed ground acceleration can be figured out. The results of illustrations dealing with the truss type steel frames and equivalence steel rigid frames can be compared with the results from adopting SAP procedure nonlinear static analysis and Pseudo-elastic approach analysis. It can be concluded that the Pseudo-elastic approach can be applied to steel truss frames and rigid frames for seismic capacity analysis with acceptable accuracy.目錄 誌謝......................................................i 中文摘要.................................................ii 英文摘要................................................iii 目錄.....................................................iv 表目錄.................................................viii 圖目錄....................................................x 第一章 緒論...............................................1 1.1 研究動機及目的 ........................................1 1.2 文獻回顧..............................................3 1.3 研究內容與方法 ........................................8 第二章 桁架式鋼構架之力學行為與規範......................11 2.1 鋼桁架結構系概述.....................................11 2.2 鋼構件力學行為 .......................................12 2.2.1 鋼構件斷面軸應力...................................13 2.2.2鋼構件斷面彎矩強度..................................14 2.2.3鋼構件斷面剪力強度..................................17 2.2.4鋼構件的降伏彎矩與塑性彎矩..........................17 第三章 擬彈性耐震能力評估................................23 3.1 擬彈性法概述.........................................23 3.2 構件雙線性行為下之能量轉換...........................23 3.3 擬彈性法之功能等值原理...............................25 3.4構架破壞定義..........................................28 3.5非線性行為擬彈性法之推衍 ..............................28 第四章桁架式鋼構架耐震能力非線性分析.....................33 4.1桁架式鋼構架擬彈性分析概述............................33 4.2桁架式鋼構架之擬彈性分析..............................34 4.2.1 構件之軸力應變能...................................34 4.2.2 擬彈性法考慮軸力之分析流程.........................35 4.3 等值鋼剛架考慮彎矩之擬彈性分析.......................38 4.3.1 桁架式鋼梁之等值慣性矩.............................39 4.3.2 桁架式鋼柱之等值慣性矩.............................42 4.3.3 構件之彎矩應變能...................................42 4.3.4 考慮彎矩之擬彈性分析流程...........................51 第五章 桁架式鋼構架耐震能力擬彈性分析實例................55 5.1桁架式鋼構架之耐震能力擬彈性分析實例概述..............55 5.2單層單跨桁架式鋼構架分析實例..........................55 5.2.1結構概述............................................55 5.2.2結構材料性質........................................56 5.2.3 設計地震力.........................................56 5.2.4桁架式鋼構架之構架分析..............................57 5.2.5等值鋼剛架之構架分析................................58 5.3雙層單跨桁架式鋼構架分析實例..........................59 5.3.1結構概述............................................59 5.3.2結構材料性質........................................59 5.3.3 設計地震力.........................................59 5.3.4桁架式鋼構架之構架分析 ..............................60 5.3.5等值鋼剛架之構架分析................................61 5.4三層單跨桁架式鋼構架分析實例..........................62 5.4.1結構概述............................................62 5.4.2結構材料性質........................................62 5.4.3 設計地震力.........................................63 5.4.4桁架式鋼構架之構架分析..............................64 5.4.5等值鋼剛架之構架分析................................65 5.5不同構架形式之單層單跨桁架式鋼構架分析實例 ...........65 5.5.1結構概述............................................65 5.5.2結構材料性質........................................66 5.5.3 設計地震力.........................................66 5.5.4不同構架型式之單層單跨桁架式鋼構架分析實例一........67 5.5.5不同構架型式之單層單跨桁架式鋼構架分析實例二........68 5.6 單層單跨桁架式鋼構架擬彈性分析修正...................68 5.7耐震能力評估與結果討論................................69 5.7.1 單層單跨桁架式鋼構架之耐震能力評估與結果討論.......69 5.7.2雙層單跨桁架式鋼構架之耐震能力評估與結果討論........70 5.7.3三層單跨桁架式鋼構架之耐震能力評估與結果討論........71 5.7.4不同構架型式桁架式鋼構架之耐震能力評估結果討論......71 5.7.5單層單跨桁架式鋼構架擬彈性分析修正結果討論..........72 第六章 結論與建議........................................73 6.1結論..................................................73 6.2 建議.................................................74 參考文獻.................................................77 附表.....................................................79 附圖.....................................................87en-US桁架式鋼構架擬彈性分析非線性分析耐震能力評估能量守恆原則truss type steel framePseudo-elasticnonlinear analysisseismic capacityenergy conservation[SDGs]SDG7thesis