【摘要】：為探討某在役鋼筋混凝土冷卻塔結構不同部位的地震易損性,通過數值模擬進行分析.應用ABAQUS軟件建立分析模型,根據結構所在場地選擇一系列合理的地震動記錄并對結構進行增量動力分析;選取了材料應變和地面峰值加速度作為結構地震需求參數和強度參數,將結構沿高度方向分為13個區(qū)域,并將結構的破壞狀態(tài)劃分為5個等級;在結構底部分別輸入單向、水平雙向和三向地震作用,對所得結構響應進行回歸分析并建立概率地震需求模型,最終得到結構沿高度方向的區(qū)域易損性曲線.分析結果表明:上部塔筒的損傷概率較小,人字柱的損傷概率明顯大于結構的其他部分;結構底部的人字支柱是結構的最薄弱部位,可根據需要對其進行加固,而塔筒的抗震性能優(yōu)異.
[Abstract]:In order to investigate the seismic vulnerability of a reinforced concrete cooling tower structure in service, the seismic vulnerability was analyzed by numerical simulation. The ABAQUS software is used to set up the analysis model and select a series of reasonable ground motion records according to the site where the structure is located and carry on the incremental dynamic analysis to the structure. Material strain and ground peak acceleration are selected as seismic demand and strength parameters of the structure. The structure is divided into 13 regions along the direction of height, and the failure state of the structure is divided into 5 grades. In this paper, unidirectional, horizontal bi-directional and three-way seismic action are inputted into the bottom of the structure respectively, and the response of the structure is analyzed by regression analysis and the probabilistic seismic demand model is established. Finally, the regional vulnerability curve of the structure along the direction of height is obtained. The results show that the damage probability of the upper tower is small, and the damage probability of the herringbone column is obviously higher than that of the other parts of the structure. The herringbone pillar at the bottom of the structure is the weakest part of the structure, which can be strengthened according to the need, and the seismic performance of the tower tube is excellent.
【作者單位】： 北京交通大學土木建筑工程學院;
【基金】：國家自然科學基金面上項目(51478033,51678039)
【分類號】：TU311.3
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本文編號：2431795