后张无粘结预应力装配混凝土联肢抗震墙的连梁组合体抗侧性能

提出一种新型后张无粘结预应力装配联肢抗震墙体系,并研究了其中的连梁组合体在侧向荷载下的性能.建立连梁组合体梁端弯矩同轴线转角的分析模型,并运用DRAIN-2DX及ABAQUS等非线性有限元软件进行了验证.分析结果表明,连梁组合体在经历较大的反复非线性变形后,除了预制混凝土连梁的保护层会出现脱落外,几乎没有损伤且具有自恢复能力,即最终的残余变形很小.通过针对连梁特性、预应力度等设计参数的分析,给出了实现连梁组合体高延性低超强的设计建议.通过合理的选择参数,新型预应力装配抗震墙的连梁组合体可以获得良好的抗侧能力.

Lateral load behavior of unbonded post-tensioned coupled concrete wall subassemblages

A new type of unbonded post-tensioned coupled concrete wall system is proposed and lateral load behavior of coupling beam subassemblages in the new wall system is analyzed.A model is developed to analyze the moment-rotation behavior of coupling beam connections of the subassemblages,which is validated by nonlinear finite element program DRAIN-2DX and ABAQUS.The results indicate that apart from surface spalling at the top and bottom of the coupling beam,the subassemblages can be almost intact over large nonlinear cyclic deformation and are possessed of the ability of self recovery,in other words, the residual deformation is small.The effect of structural design parameters such as beam properties and the amount of posttensioning on the behavior of the subassemblages is investigated.Some suggestions are put forward to achieve high ductility and low over-strength of coupling beam subassemblages.By reasonably choosing these parameters in design,coupling beam subassemblages of new type wall system can be made with good performances under lateral load.