超高层矩形建筑混凝土结构层间位移角限值分析

Analysis on the Limit of Displacement Angle between Concrete Floors of Super Tall Building

研究超高层矩形建筑混凝土结构层间位移角限值。建立超高层矩形建筑混凝土框架结构模型,所有建筑支撑柱均采用矩形截面,通过有限元运算软件ABAQUS对超高层矩形建筑混凝土弹性和弹塑性层进行时程分析,构建ABAQUS有限元模型。分析混凝土结构弹性层间位移角限值,研究混凝土强度等级和建筑层数对层间位移角的影响。依据REER选择法选择部分实际地震数据,将得到的地震数据转换成反应谱,通过程序产生7个人工波。把选择的地震波依次施加至模型,对超高层矩形建筑混凝土进行弹塑性动力时程分析。对15个超高层矩形建筑混凝土结构模型在7个地震波作用下不同性能水平极限状态的层间位移角限值进行记录,获取大多数数据的下限值,将其看作相应性能水平下混凝土结构层间位移角限值。实验结果表明:结构层数对开裂层间位移角的影响大,混凝土强度等级对开裂层间位移角影响小,超高层矩形建筑混凝土弹性层间位移角限值为0.002;完好性能、轻微损坏、轻~中度损坏、中等损坏、不严重损坏水平下结构弹塑层间位移角限值依次是0.004、0.005、0.009、0.012、0.016。

White researching on the limit of displacement angle of concrete structure in super high-rise rectangular buildings,the model of the concrete frame structure of a high-rise rectangular building was established,and all the building support columns were of rectangular cross-section.The ABAQUS finite element model was constructed by time-history analysis of the elastic and elastoplastic layer of the super high-rise rectangular concrete structure by finite element software ABAQUS.The displacement angle limit of the elastic layer of concrete structure was analyzed,and the influence of the concrete strength level and the number of building layers on the displacement angle of the interlayer was studied.Based on the REER selection method,some actual seismic data were selected and the obtained seismic data were converted into response spectra,and 7 artificial waves were generated through the program.The selected seismic waves were applied to the model in turn,and the elasto-plastic dynamic time-history analysis was carried out for the super high-rise rectangular concrete.For the fifteen super high-rise rectangular concrete structures,the limit values of interlayer displacement at different performance levels under the action of seven seismic waves were recorded and the lower limit of most data was obtained,which was regarded as the interlayer drift angle limit of concrete structure under the corresponding performance level.Experimental results show that the influence of the number of structural layers on the displacement angle between cracks is large,and the strength level of concrete has little effect on the displacement angle between the cracks.The displacement limit of the elastic layer of the concrete for super high-rise rectangular buildings is 0.002.Moderate damage,moderate damage,not serious damage to the structure of the elastic layer displacement limits are 0.004,0.005,0.009,0.012,0.016.