设置开槽耗能板的装配式自复位方钢管混凝土框架抗震性能试验研究  

Experimental study on seismic behavior of prefabricated self-centering concrete-filled square steel tubular frame with slotted energy-dissipating plates

作　　者：谢川东 王先铁[1] 郭艺伟 杨博乐 王汇城 XIE Chuandong;WANG Xiantie;GUO Yiwei;YANG Bole;WANG Huicheng(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《建筑结构学报》2024年第8期154-167,共14页Journal of Building Structures

基　　金：国家自然科学基金项目(51678474,52278213);陕西省自然科学基金项目(2022JM-189)。

摘　　要：为降低自复位结构滞回耗能对复位的影响,提出一种设置开槽耗能板的装配式自复位方钢管混凝土框架,框架的梁内预应力筋各跨独立布置,可实现工厂张拉的装配化施工。考虑不同厚度的耗能钢板与加载历程,设计4榀1/2缩尺单跨两层框架,对其开展拟静力试验研究,推导考虑框架扩展效应时梁的内力计算式。结果表明:框架滞回曲线呈典型的“双旗帜”形,加载至层间位移角2.0%时,各框架残余变形均接近0.20%;结构损伤集中于可更换的耗能板,主体构件完好;在层间位移角2.0%时卸载更换同类型耗能板,框架的受力性能基本不变,表现出良好的损伤控制机制和可恢复特性;在保证耗能板耗能段总面积不变的前提下,减小单根板条宽度有利于实现框架的复位性能目标,且框架承载力基本不变;框架扩展效应导致两侧柱底剪力分配不均,梁因柱的约束作用附加额外轴力;理论计算的梁轴力与预应力筋内力及试验结果误差在10%以内,可作为结构分析与设计的依据。A prefabricated self-centering concrete-filled square steel tubular frame(PSC-CFSTF)with slotted energydissipating plates was proposed to address the issue of the conflict between energy-dissipation and self-centering capacity.In the new solution,post-tensioned strands are independently arranged in every span for facilitating construction.Low-cycle loading tests were carried out on 1/2-scale four single-span two-story specimens considering different thicknesses of energy-dissipating plates and loading histories,followed by theoretical analysis considering frame-expansion effects.The results demonstrate that the hysteresis curve of PSC-CFSTF exhibits a typical double flag shape and the residual drift of all specimens is approximately 0.20%after being loaded to 2.0%story drift.Damage is only found in the replaceable energy-dissipating plates while the structural components remain usable.Besides,restoration is confirmed at 2.0%story drift with favorable damage-control ability and resilience.Reducing the width of bars but keeping same section area can increase the recentering ability while maintaining the same strength.Frame expansion leads to larger axial force in the beam and different shear forces of the column bases.Moreover,the proposed mechanical model can well predict the axial force in beams and strands,and errors is less than 10%,which can facilitate structural design.

关 键 词：自复位框架 装配式 开槽耗能板 拟静力试验 框架扩展效应 抗震性能 

分 类 号：TU398.2[建筑科学—结构工程] TU317.1