鋼筋混凝土框架結構基于規(guī)范需求譜Pushover分析方法的保證率
張望喜,霍雨佳,陳文杰
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（湖南大學土木工程學院, 長沙 410082）
［摘要］運用SAP2000軟件從5個方面探討了三維框架結構頂點位移對地震烈度、場地條件、側向力加載模式、結構重量和材料性能等不確定性因素的敏感性程度。然后建立了一個7層的三維框架模型，詳細地分析了各類場地條件下的確定性Pushover分析頂點位移和Pushover實際需求譜分析頂點位移。根據(jù)統(tǒng)計分析原理對頂點位移的概率分布進行了研究，從而得到確定性Pushover分析方法的保證率和適用性。結果表明：頂點位移對需求曲線的敏感性遠強于能力曲線；若地震作用下結構的變形進入彈塑性狀態(tài)，則確定性Pushover分析結果保證率較高，在這樣的情況下，Pushover分析方法是一種可靠的抗震性能評估方法；若結構變形在地震作用下始終處于彈性狀態(tài)，則Pushover分析方法不適用。［關鍵詞］三維框架結構; Pushover分析; 頂點位移; 敏感度分析; 概率分析中圖分類號：TU352 文獻標識碼：A 文章編號：1002-848X(2016)12-0054-06
Probability analysis of reinforced concrete frame structure Pushover analysis method based on specification demand spectrumZhang Wangxi, Huo Yujia, Chen Wenjie(College of Civil Engineering, Hunan University, Changsha 410082, China)Abstract: The sensitivities of the top displacements of three-dimensional reinforced concrete frame structure to the uncertainty factors were discussed through using SAP2000 software from five aspects, such as the seismic intensity, site characteristics, lateral load loading mode, structural weight and material properties. Then, a 7-storey three-dimensional frame model was established to analyze the top displacements with the certainty Pushover analysis method and the Pushover actual demand spectrum analysis method under various site conditions. According to the principle of statistical analysis, the probability distribution of the top displacement was studied, and the guarantee rate and applicability of the certainty Pushover analysis method were obtained. The results show that the sensitivity of top displacement to demand curve is much stronger than to the capacity curve; if the deformation of structure enters the elastic plastic state under seismic action, certainty Pushover analysis results have higher guarantee rate, and in such a situation, the Pushover analysis method is a reliable method of seismic performance evaluation; if the structure deformation is always elastic state under the action of earthquake, Pushover analysis method is not applicable.Keywords: three-dimensional frame structure; Pushover analysis; top displacement; sensitivity analysis; probability analysis
作者簡介：張望喜，博士，副教授， Email:wxizhang2000@163.com。
