Fuzzy genetic optimization on performance-based seismic design of reinforced concrete bridge piers with single-column type
Fuzzy genetic optimization on performance-based seismic design of reinforced concrete bridge piers with single-column type
复制标题
单柱式钢筋混凝土桥墩性能抗震设计的模糊遗传优化
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
C. Su
中科院分区：
文献类型：
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作者：
Y. Sung;C. Su
本文提出了单柱型钢筋混凝土桥墩抗震性能设计的模糊遗传优化方法。该设计模型是一个约束优化问题，其目标是在设计的钢筋混凝土桥墩的合格结构能力和适当的配筋布置的约束下，使施工成本最小化。将违反约束与工程造价相结合作为目标函数。采用模糊逻辑控制（FLC）对遗传算法（GA）优化求解器中的惩罚系数进行调整，在整个计算过程中避免惩罚过强或过弱，从而有效地获得可行解。采用已报道的方截面、矩形截面和圆形截面三个桥墩的循环荷载试验结果作为调查数据基础。此外，以某方形RC桥墩为例，分析了不同地震峰值地面加速度（PGAs）对应的四个性能目标（全面运行、正常运行、生命安全和接近倒塌）的PBSD。成功地确定了6种可行的桥墩设计方案，得到了造价最小的最优方案。计算结果表明，所提出的算法对钢筋混凝土桥墩的PBSD设计是可以接受的。结合遗传算法和FLC算法的优点，研究了该算法的可行性。此外，通过所提出的系统化设计流程，可以有效地减少不同设计工程师的PBSD差异，显著提高设计效率和设计精度。
This paper presents a fuzzy genetic optimization for performance-based seismic design (PBSD) of reinforced concrete (RC) bridge piers with single-column type. The design is modeled as a constrained optimization problem with the objective of minimizing construction cost subject to the constraints of qualified structural capacity and suitable reinforcement arrangements for the designed RC pier. A violation of the constraints is combined with construction cost to serve as the objective function. The fuzzy logic control (FLC), which adapts the penalty coefficients in the genetic algorithm (GA) optimization solver, was employed to avoid a penalty that is too strong or too weak through the entire calculation so that a feasible solution can be obtained efficiently.The reported results of cyclic loading tests for three piers with square section, rectangular section and circular section, respectively, were employed as the data-base of investigation. Furthermore, a case study on the PBSD of a square RC bridge pier with four required performance objectives (fully operational, operational, life safety and near collapse) corresponding to different peak ground accelerations (PGAs) of earthquakes was analyzed. Six feasible designs of the pier were determined successfully and the optimal one with minimum construction cost was obtained accordingly. The result obtained shows that the proposed algorithm gives an acceptable design for the PBSD of the RC bridge piers.The superiorities of GA and FLC were incorporated and the availability of the proposed procedure was investigated. Moreover, through the proposed systematic design procedure, the discrepancy in the PBSD from different design engineers will be lessened effectively and the design efficiency as well as the design precision will also be enhanced significantly.