密肋复合墙体压弯剪复合受力性能非线性数值分析

应用通用有限元程序ANSYS,采用"实体单元-组合式配筋"计算模型,以墙体剪跨比、边框柱截面尺寸及配筋率作为变化参数,对墙体压弯剪复合受力性能进行非线性有限元分析。通过对不同墙体模型的承载力以及墙体截面正应力和应变等计算结果的分析,研究较大剪跨比密肋复合墙体的破坏形态及特征、受剪及受弯承载力的影响因素、压弯极限状态下墙体的应力及应变特征,为复合墙体正截面压弯承载力计算公式及构造措施的建立提供依据。经对比分析表明,有限元计算结果与试验结果吻合较好。因此,采用提出的有限元模型及方法得出的密肋复合墙体压弯剪复合受力性能的非线性有限元分析结果是可靠且可信的。

Nonlinear numerical analysis on hybrid behaviors of multi-ribbed composite wall under compression, bending and shear

Using finite element program ANSYS and adopting the"solid element-compound reinforcement"model,a nonlinear finite element analysis was performed on the multi-ribbed composite walls under the combined actions of compression, bending and shear. In the analysis, shear-span ratio, section dimensions and reinforcement ratio of end-frame column of the composite wall are considering as the varying parameters. The failure forms and features, influence factors of shear and bending bearing capacity, and characteristics of stress and strain in ultimate state on the compression-bending of the wall with larger shear-span ratios were studied. Moreover, the numerical results on the bearing capacity, normal sectional stress and strain of different wall models were carefully analyzed and these data were utilized to establish a compression-bending bearing capacity formula and construction measures for the wall. After a systematic comparison between the analysis results and experimental measurements, it indicated that the finite element predictions correlated with the test data quite well. It is therefore concluded that the nonlinear finite element analysis results on the composite walls under compression, bending and shear presented in the paper should be reasonably reliable.