预应力预制混合装配双肢墙弹塑性性能

Elastoplastic performances of prestressed precast hybrid coupled wall

提出了新型预应力预制混合装配双肢墙(PPHCW)结构,推导了PPHCW的整体性系数和肢强系数的计算公式,以DRAIN-2DX软件为分析平台,基于自行开发的5,12号单元,对PPHCW结构的弹塑性性能进行参数分析,包括:肢强系数、整体性系数、连接钢筋面积、预应力筋面积、有效预应力和墙肢纵筋配筋率.结果表明:增加连接钢筋及预应力筋面积,减小有效预应力、墙肢纵筋配筋率和整体性系数可延迟连梁中预应力筋的屈服;随整体性系数、预应力筋和连接钢筋的面积、墙肢纵筋配筋率的增大及肢强系数的减小,结构承载力随之提高;上述参数对结构延性均有影响,但其影响结果与结构的破坏极限状态相关;与整体性系数相比,耦联率可综合反映结构几何尺寸、连梁与墙肢配筋对结构弹塑性性能的影响.

A new kind of prestressed precast hybrid coupled wall（PPHCW） is proposed.Limb strength coefficient and integrative coefficient of PPHCW were derived.The effects of limb strength coefficient,integrative coefficient,area of connecting reinforcement and prestressing tendon,effective prestress and longitudinal reinforcement ratio of wall on seismic behavior of the structure were studied based on the finite element DRAIN-2DX and the computer code 5 element,12 element developed.The results indicate that increasing area of prestressing tendon and connecting reinforcement and reducing effective prestress,integrative coefficient and longitudinal reinforcement ratio of wall can delay the yielding of prestressing tendon in the coupled beam;the bearing capacity of the structure increases with the increase of integrative coefficient,area of prestressing tendon and connecting reinforcement,longitudinal reinforcement ratio of wall,and the decrease of limb strength coefficient;their effects on the ductility are related to the limit state;compared with integrative coefficient,the degree of coupling can synthetically reflects the effects of geometry of the structure,reinforcement of coupling beam and wall on the elastoplastic performances of the structure.