基于多目标优化的既有钢筋混凝土框架FRP加固性能设计

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Bollettino Di Geofisica Teorica Ed Applicata Pub Date : 2017-01-01 DOI:10.4430/BGTA0202
C. Chisari, Chiara Bedon
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引用次数: 8

摘要

建筑遗产的保护通常涉及钢筋混凝土框架结构的抗震加固。当必须提高柱的强度和延性时,一种有效的技术是使用纤维增强聚合物(FRP),其形式是粘在柱上的包裹,由于约束作用,它能够提高性能。本文描述了一种基于优化设计的FRP加固现有RC框架的程序。设计的目的是在成本和性能方面找到最具竞争力的解决方案,同时满足基于性能的设计对可使用性和最终地震危险级别所施加的损害水平。由此产生的多目标优化问题,其中设计变量由FRP膜的厚度表示,然后通过遗传算法求解。应用于实际案例研究表明,如何分析结果的帕累托前沿,即一组非主导解决方案,清楚地描述了成本和性能之间的阈值。此外,可以对最佳解决方案对设计变量的敏感性进行有趣的考虑,从而改进对优化结果的评估。
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Performance-based design of FRP retrofitting of existing RC frames by means of multi-objective optimisation
Safeguard of built heritage often involves seismic retrofitting of reinforced concrete (RC) frame structures. When strength and ductility of columns must be enhanced, an effective technique is given by the use of Fibre-Reinforced Polymer (FRP) in forms of wraps glued to the columns, which are able to improve performance thanks to confinement action. In this paper, an optimisation-based procedure for the design of FRP retrofitting of existing RC frames is described. The design aims at finding the most competitive solution in terms of cost and performance, while satisfying the damage levels imposed by Performance-Based Design for serviceability and ultimate seismic hazard levels. The resulting multi-objective optimisation problem, in which the design variables are represented by the thickness of FRP wraps, is then solved by means of Genetic Algorithms. The application to a realistic case study shows how the analysis of the resulting Pareto Front, i.e., the set of non-dominated solutions, clearly describes the threshold between cost and performance. Furthermore, interesting considerations about the sensitivity of the best solutions to the design variables can be made, improving the assessment of the optimisation results.
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来源期刊
Bollettino Di Geofisica Teorica Ed Applicata
Bollettino Di Geofisica Teorica Ed Applicata 地学-地球化学与地球物理
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>12 weeks
期刊介绍: The "Bollettino di Geofisica Teorica ed Applicata" is an international open access journal dedicated to the publication of original papers dealing with Deep Earth Geophysics, Near Surface Geophysics, Exploration Geophysics, Borehole Geophysics, Geodynamics and Seismotectonics, Seismology, Engineering Seismology, Geophysical Modelling, Geodesy, Remote Sensing, Seismic and Geodetic Networks, Oceanography, and their application in the fields of Energy, Natural Resources, Environment and Climate, Policies and Regulations, Risk and Security, Technological Development.
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