王文达, 王军. 远场地震作用下钢管混凝土组合框架的地震反应分析[J]. 工程力学, 2012, 29(增刊I): 124-129. DOI: 10.6052/j.issn.1000-4750.2011.11.S026
引用本文: 王文达, 王军. 远场地震作用下钢管混凝土组合框架的地震反应分析[J]. 工程力学, 2012, 29(增刊I): 124-129. DOI: 10.6052/j.issn.1000-4750.2011.11.S026
WANG Wen-da, WANG Jun. SEISMIC RESPONSE OF COMPOSITE FRAME WITH CFST COLUMNS UNDER FAR-FIELD GROUND MOTION[J]. Engineering Mechanics, 2012, 29(增刊I): 124-129. DOI: 10.6052/j.issn.1000-4750.2011.11.S026
Citation: WANG Wen-da, WANG Jun. SEISMIC RESPONSE OF COMPOSITE FRAME WITH CFST COLUMNS UNDER FAR-FIELD GROUND MOTION[J]. Engineering Mechanics, 2012, 29(增刊I): 124-129. DOI: 10.6052/j.issn.1000-4750.2011.11.S026

远场地震作用下钢管混凝土组合框架的地震反应分析

SEISMIC RESPONSE OF COMPOSITE FRAME WITH CFST COLUMNS UNDER FAR-FIELD GROUND MOTION

  • 摘要: 为研究在远场地震动作用下钢管混凝土组合框架的反应,设计了某10层钢管混凝土组合框架,从PEER强震记录数据库中选取了28条远场(距离大于10km)强震地震动记录作为输入地震波,按美国地质勘探局(USGS)对场地类别分类方法将其分为A、B、C、D四类,基于OpenSees建立了非线性纤维梁柱单元的理论模型,对其进行了设防烈度为8度时多遇和罕遇地震作用下弹塑性时程分析,计算结果同时与Pushover分析结果进行了对比。结果表明:虽然不同地震动作用下钢管混凝土组合框架结构反应的离散性较大,但该类结构在不同场地类别下的反应仍具有一定规律性。与Pushover分析结果对比表明,对于该文中规则框架倒三角侧力分布模式比均布侧力更接近于钢管混凝土组合框架在地震作用下的地震力分布,可用在钢管混凝土框架结构的抗震分析中。

     

    Abstract: A typical 10-story composite frame with concrete filled steel tubular (CFST) columns was designed to study the seismic response under far-field ground motion. 28 far-field (>10km) ground motion records in the strong motion database from the Pacific Earthquake Engineering Research (PEER) Center were used for the ground motion input. The sites were divided into four types, named A, B, C and D respectively, according with the classification of United States Geological Survey (USGS). The nonlinear fiber beam-column element was used to simulate the CFST columns and beams, respectively, and the elastic-plastic dynamic time history analysis was performed using OpenSees under meeting more and rare earthquakes of the seismic precautionary intensity in 8 degrees. The results were compared with that of pushover analysis. It is shown that the seismic response of the composite frame exhibits some regularity under different sites and ground motions though the results are discrete. The inverted triangle lateral load pattern is more similar to the result of dynamic time history analysis than the uniform distribution lateral load pattern for the regular composite frame structures, thusly the inverted triangle lateral load pattern should be used to the pushover analysis for the composite frame with CFST columns.

     

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