新型装配式波纹钢板-聚氨酯组合剪力墙抗震性能有限元分析

Finite Element Analysis on Seismic Behavior of A New Prefabricated Corrugated Steel Plate and Polyurethane Composite Shear Wall

聚氨酯具有很好的黏结性和抗拉、压以及抗剪强度,除了具有较好的保温隔热作用外,与波纹钢板相结合使用还可以起到限制钢板面外屈曲的作用。同时在聚氨酯外侧放置加压水泥板,可以起到一定的防火作用。鉴于此,提出了一种新型装配式波纹钢板-聚氨酯组合剪力墙。为研究其在低周反复荷载作用下的受力性能、破坏过程,以及不同参数对其抗震性能的影响,采用ABAQUS有限元分析软件建立了19个波纹钢板-聚氨酯组合剪力墙有限元分析模型,分析了不同轴压比、钢板宽高比、墙体厚度、钢板厚度、柱子柔度系数等主要设计参数对其抗震性能的影响规律。分析结果表明:随着钢板厚度的增加,墙体的峰值承载力也会提高,但是其延性会有所下降,变形能力也会变差;随着轴压比的增大,墙体的峰值承载力、延性系数以及极限位移都会降低,变形能力也会降低,因此建议轴压比取值不大于0.2;随着钢板宽高比的增大,墙体的峰值承载力有大幅度的增加,同时其延性也会增加,变形能力增强,但是极限位移会变小,为了能够充分利用钢板,更好发挥其性能,建议波纹钢板宽高比应控制在0.8~1.2;在钢板两侧填充一定厚度的聚氨酯,可以减小钢板的面外屈曲变形,且随着聚氨酯填充厚度的增加,墙体的峰值承载力会有提高,且当墙体厚度小于200 mm时,墙体的延性系数会随着聚氨酯填充厚度的增加而增大,但是当墙体厚度为240 mm时,与厚度为200 mm的墙体相比较,其延性系数出现了下降,变形能力变差。因此,建议聚氨酯填充厚度不大于200 mm;随着边框柱柔度系数的减小,墙体的峰值承载力以及延性系数都会有所提高,但是当柔度系数小于2.87时,随着柔度系数的减小,构件延性提高程度会减小。

In addition to good thermal insulation performance,polyurethane has certain caking property,tensile,compressive,and shear strength,can effectively restrict the out-plane buckling of the steel plate.At the same time,the cement board is placed on the outside of the polyurethane and can play a certain role in fire prevention.A new prefabricated corrugated steel plate and polyurethane composite shear wall(SPPSW)is put forward.In order to study the mechanical behavior and failure process of the SPPSW under low cyclic load,and the influence of different parameters on its seismic performance.In this paper,the ABAQUS was used to establish 19 finite element analysis models of SPPSW.The influence of the axial compression ratio,steel plate aspect ratio,wall thickness,steel plate thickness and column flexibility coefficient on the seismic performance of SPPSW is investigated.The results show:with the increase of the thickness of the steel plate,peak load of the SPPSW increases,but the ductility coefficient decreases and deformation capacity decreases.With the increase of the axial compression ratio,the peak load,ductility coefficient and ultimate displacement of the wall decrease,and the deformation capacity also decreases.Therefore,the axial compression ratio recommendes to be no more than 0.2.With the increase of steel plate aspect ratio,the peak load,ductility coefficient and deformation capacity of the wall increase,but ultimate displacement decreases.In order to make full use of steel plate and play better performance,it is suggested that the aspect ratio of corrugated steel plate should be controlled at 0.8-1.2.Filling polyurethane on both sides of the steel plate can decrease the out-of-plane buckling deformation of steel plate,and with the increase of the filling thickness of polyurethane,the peak load of the wall increases.When the wall thickness is less than 200 mm,the ductility coefficient of the wall increases with the increase of the polyurethane filling thickness.Compared with the wall thickness of 200 mm,when the wall thickness is 240 mm,the ductility coefficient decreases.Therefore,it is suggested that the filling thickness of polyurethane is not more than 200 mm.With the decrease of flexibility coefficient of the column,the peak load and ductility coefficient of the wall increase.However,when the flexibility coefficient is less than 2.87,with the decrease of the flexibility coefficient,the ductility improvement degree of the component decreases.