损坏钢筋混凝土框架的回收:更换破碎的混凝土,并在连接处的横梁下方/上方安装钢支撑

N. Ahmad, Arifullah, B. Ilyas, Sida Hussain
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引用次数: 1

摘要

通过实验和数值研究,评估了回收技术应用于1:3缩小比例受损钢筋混凝土框架的效果。梁柱连接处的碎混凝土被新的高强度混凝土取代。在界面处使用环氧砂浆,以确保新旧混凝土之间的粘结。此外,连接处配备了钢制拱腋,应用于梁的下方和上方。改造后的车架在准静态循环载荷下进行了试验。获得了试验框架的横向阻力-位移滞回响应,以量化滞回阻尼,推导出横向阻力-应变能力曲线,并制定性能水平。该技术提高了帧的响应;显示出与未损坏的原始框架相比框架的横向刚度、阻力和屈服后刚度的增加。这种良好的性能归因于安装在连接处的钢制拱腋。在有限元程序SeismStruct中校准了一个具有代表性的数值模型。将一组频谱兼容的地面运动输入到数值模型中,用于响应历史分析。计算了设计基准地震和最大考虑地震的楼层漂移需求。此外,该技术被扩展到一个五层框架,并通过非线性静态推倒和反应历史分析进行了评估。建议采用WR=4.0的超强系数,以便于分析和初步设计用于改造低/中高层钢筋混凝土框架的钢拱腋和锚固件。
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Recycling of damaged RC frames: Replacing crumbled concrete and installing steel haunches below/above the beam at connections
Experimental and numerical studies are presented evaluating the efficacy of a recycling technique applied to a 1:3 reduced scale damaged RC frame. The crumbled concrete at the beam-column connections was replaced with new high-strength concrete. Epoxy mortar was applied at the interface to secure bonding between the old and new concrete. Additionally, the connections were provisioned with steel haunches, applied below and above the beams. The retrofitted frame was tested under quasi-static cyclic loads. The lateral resistance-displacement hysteretic response of the tested frame was obtained to quantify hysteretic damping, derive the lateral resistance-displacement capacity curve, and develop performance levels. The technique improved the response of the frame; exhibiting an increase in the lateral stiffness, resistance and post-yield stiffness of the frame in comparison to the undamaged original frame. This good behaviour is attributed to the steel haunches installed at connections. A representative numerical model was calibrated in the finite element program SeismoStruct. A set of spectrum compatible ground motions were input to the numerical model for response history analysis. The story drift demands were computed for both the design basis and maximum considered earthquakes. Moreover, the technique was extended to a five-story frame, which was evaluated through nonlinear static pushover and response history analyses. Overstrength factor WR = 4.0 is proposed to facilitate analysis and preliminary design of steel haunches and anchors for retrofitting the low-/mid-rise RC frames.
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来源期刊
CiteScore
2.50
自引率
17.60%
发文量
14
期刊最新文献
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