桁架式鋼構架之耐震能力擬彈性研究

A Study on Pseudo-Elastic Aseismic Capacity for Trussed Type Steel Frame

陳怡如(Yi-Ru Cheng)

指導教授 ： 陳清泉

國立臺灣大學/工學院/土木工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.00098

摘要

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。

關鍵字

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

並列摘要

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.

並列關鍵字

truss type steel frame ； Pseudo-elastic ； nonlinear analysis ； seismic capacity ； energy conservation

參考文獻

[1]Applied Technology Couneil (ATC), “Seismic Evaluation and Retrofit of Concrete Buildings”, Vol.1, ATC40, Redwood City, CA, 1996.

[2] Federal Emergency Management Agency, “NEHRP guidelines for the seismic rehabilitation of buildings“, FEMA273, 1997.

[8] 李佳諭，「混合式多層構架耐震能力之擬彈性分法評估研究」，碩士論文，國立臺灣大學土木工程研究所，陳清泉教授指導，1996。]

[17] Ahmed EL-Sheikh “Effect of force limiting devices on behavior of space trusses”, Structural Engineering, Vol.21, 1999.pp34-44.

參考文獻