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预应力装配式混凝土框架-屈曲约束支撑体系参数分析

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为了促进装配式混凝土框架在强震区的应用,针对一种新型预应力装配式混凝土框架-屈曲约束支撑体系(BRB-PPCF),进行了 20 条地震波作用下 6、9 和 12 层 BRB-PPCF算例的动力时程分析.结果表明:在罕遇地震烈度和极罕遇地震烈度下,BRB-PPCFs的最大层间位移角(θmax)平均值均远小于 2.0%,最大残余层间位移角(θr)均小于 0.5%.随 BRB-PPCF中抗弯子框架(MSF)与抗侧子桁架(TSS)的层间初始刚度比 αc 的减少,BRB-PPCFs的 θmax 和 θr 均逐渐减少,可有效提升其抗震能力和震后可恢复性能.在线性极限状态下MSF的层间剪力与在屈服时TSS的层间剪力的比值ψ增加,BRB-PPCFs的θmax 和θr 均表现出先减少后增加,但影响相对较小.预应力筋的初张应力与其比例极限强度的比值σpi/σpl 对BRB-PPCF的θmax 和θr 的影响可以忽略.
Parametric Analysis of Prestressed Precast Concrete Frames with Buckling-Restrained Braces
To promote the application of precast concrete frames in earthquake hazard areas,a new pres-tressed precast concrete frame with buckling-restrained braces(BRB-PPCF)was proposed,and the nonlin-ear dynamic time-history analysis of 6-story,9-story and 12-story BRB-PPCF cases under 20 earthquake waves were carried out.The results showed that the average maximum inter-story drift ratios θmax of BRB-PPCFs were less than 2.0%and the maximum residual inter-story drift ratios θr were less than 0.5%under both rare and extremely rare seismic intensity.The θmax and θr values of BRB-PPCFs gradually decreased with the decrease of the initial stiffness ratio αc between the moment-resistant sub-frame(MSF)and the truss sub-system(TSS).Reducing the αc value of BRB-PPCF effectively improved its seismic performance and post-earthquake recoverability.The θmax and θr values of BRB-PPCFs decreased first and then increased with the increase of the ratio ψ of the MSF inter-story shear force at linear limit state and the TSS shear force at yield state,and the influence of the ψ was relatively small.The effects of the ratio σpi/σpl between the initial tensile stress and the proportional ultimate strength on the θmax and θr values of the BRB-PPCF could be ignored.

precast concretebuckling-restrained bracepost-tensioned prestressingseismic performanceparameter analysis

卿缘、巩兆辉、王春林、曾滨

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东南大学混凝土及预应力混凝土结构教育部重点实验室,南京 210096

中冶建筑研究总院有限公司,北京 100088

装配式混凝土 屈曲约束支撑 后张预应力 抗震性能 参数分析

国家重点研发计划项目

2022YFC3801800

2024

工业建筑
中冶建筑研究总院有限公司

工业建筑

CSTPCD
影响因子:0.72
ISSN:1000-8993
年,卷(期):2024.54(10)