钢板混凝土组合墙试验和有限元分析

Testing and finite element analysis on steel-plate concrete composite wall

设计制作了4个1/4缩尺模型的钢板混凝土组合墙试件,进行拟静力试验,通过改变墙体构造措施与含钢率来研究此类墙体的抗震性能.然后,采用ABAQUS软件建立非线性有限元分析模型,进行参数分析.试验结果表明,增加钢板厚度可明显增加组合墙体的承载力、耗能能力等.在含钢率相近的情况下,设置封板构造的组合墙体与含加劲肋的墙体具有相近的承载力,但前者的屈服荷载、延性性能及耗能能力明显更高.有限元参数分析结果表明,增加封板数量,提高了含钢率,增加了试件峰值荷载,而增设加劲肋可使试件各特征值明显提高;降低剪跨比能够提高试件的承载力,但试件延性降低,不利于抗震.钢板混凝土墙体不满足抗震性能要求时,可通过提高钢板厚度、增加加劲肋数量和采用腔体结构形式来提高墙体抗震性能.

Four reduced-scale steel-plate concrete(SC)walls with the similitude of 1/4 were manufactured.Pseudo-static testing was used to investigate the seismic performance of the SC walls by changing construction measurement and the steel ratio.Then,nonlinear finite element models of the four SC walls were established by ABAQUS to carry out parametric analysis.The experimental results show that the increase of the thickness of the steel plate can significantly increase the bearing capacity,the energy dissipation capacity and so on.With the similar steel ratio,the SC wall with steel diaphragms and the SC wall with stiffening ribs have the comparative bearing capacity,but the yield load,the ductility and the energy dissipation capacity of the SC wall with steel diaphragms are larger than those of the SC wall with stiffening ribs.The parametric analysis results of the finite element models show that the increase of the number of steel diaphragms increases the steel ratio and the peak load of the specimens,while the performance values of the SC wall are obviously improved with the increase of the numbers of the stiffening rib.The decrease of the shear span ratio can increase the bearing capacity of the specimens,but decrease the ductility of the specimens,which is not good for the seismic resistance of the SC walls.When the SC walls cannot meet the requirements of seismic performance,the seismic performance of the wall can be improved by increasing the thickness of the steel plate and the number of the stiffening ribs,and using the chamber structure.