Local and global integrative retrofitting of reinforced concrete frames using in-plane buckling steel braces

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Earthquake Engineering & Structural Dynamics Pub Date : 2024-10-07 DOI:10.1002/eqe.4247
Devyani Tewatia, P. C. Ashwin Kumar
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Abstract

Two large-scale, single-storey, single-bay reinforced concrete (RC) moment frames, designed as per an outdated seismic code to represent a typical framing detail of a four-storey building, have been tested under displacement-controlled quasi-static loading protocol as per ACI 374.1-05. The RC frames include a plinth beam with brick infill underneath, a slab monolithically cast with the top beam and provision for applying axial load to the column to simulate real construction scenario. One of the frames has been tested as a bare frame, and the second one has been retrofitted with conventional steel braces designed to undergo in-plane buckling. The size of the brace has been selected based on the result of a nonlinear time history analysis of representative low- to mid-rise open-ground storey RC buildings. Post-installed chemical anchors have been utilized to connect the steel braces to the narrow RC frame members following the outcomes of an experimental investigation by the same authors. Local-level retrofitting by steel jacketing using adhesives has been designed and utilized on columns and beams to achieve the desired seismic response. The seismic performance of the retrofitted frame has been compared with the bare frame in terms of strength, stiffness, ductility, energy dissipation and hysteretic damping. The tests provide insight into the role of the plinth beam, effect of RC slab on the strong-column weak-beam aspect and the achievement of the desirable hinge mechanism through a precise design and detailing of global and local level retrofitting technique.

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平面内屈曲钢支撑钢筋混凝土框架的局部和整体一体化改造
两个大型、单层、单湾钢筋混凝土(RC)弯矩框架,按照过时的抗震规范设计,代表四层建筑的典型框架细节,已经按照ACI 374.1-05在位移控制的准静态加载协议下进行了测试。钢筋混凝土框架包括底部填充砖的基梁,顶部梁的整体浇筑板,以及对柱施加轴向载荷的规定,以模拟真实的施工场景。其中一个框架已经作为裸框架进行了测试,第二个框架已经用传统的钢支撑进行了改造,设计用于承受平面内屈曲。在对具有代表性的中低层露天钢筋混凝土建筑进行非线性时程分析的基础上,选定了支撑的尺寸。后安装的化学锚已被用来连接钢撑到狭窄的钢筋混凝土框架成员后,同一作者的实验调查的结果。为了达到预期的地震响应,在柱和梁上设计并使用了胶粘剂进行钢护套的局部加固。在强度、刚度、延性、能量耗散和滞回阻尼方面,对加固框架的抗震性能与裸框架进行了比较。这些试验深入了解了基础梁的作用,RC板对强柱弱梁的影响,以及通过精确设计和详细说明整体和局部水平的改造技术实现理想的铰链机构。
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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
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