白久林, 陈辉明, 孙博豪, 金双双. RC框架结构地震均匀损伤优化设计[J]. 工程力学, 2020, 37(8): 179-188. DOI: 10.6052/j.issn.1000-4750.2019.10.0572
引用本文: 白久林, 陈辉明, 孙博豪, 金双双. RC框架结构地震均匀损伤优化设计[J]. 工程力学, 2020, 37(8): 179-188. DOI: 10.6052/j.issn.1000-4750.2019.10.0572
BAI Jiu-lin, CHEN Hui-ming, SUN Bo-hao, JIN Shuang-shuang. SEISMIC UNIFORM DAMAGE-TARGETED DESIGN OF RC FRAME STRUCTURES[J]. Engineering Mechanics, 2020, 37(8): 179-188. DOI: 10.6052/j.issn.1000-4750.2019.10.0572
Citation: BAI Jiu-lin, CHEN Hui-ming, SUN Bo-hao, JIN Shuang-shuang. SEISMIC UNIFORM DAMAGE-TARGETED DESIGN OF RC FRAME STRUCTURES[J]. Engineering Mechanics, 2020, 37(8): 179-188. DOI: 10.6052/j.issn.1000-4750.2019.10.0572

RC框架结构地震均匀损伤优化设计

SEISMIC UNIFORM DAMAGE-TARGETED DESIGN OF RC FRAME STRUCTURES

  • 摘要: 地震均匀损伤失效模式是指结构在强震下各楼层的损伤大小相同、侧向变形近似,并具有全局化的耗能机制,是结构较理想的破坏模式。提出了考虑土-结构动力相互作用影响的RC框架结构地震均匀损伤优化设计方法。以结构层间位移角均匀化为目标,以梁柱构件截面配筋为优化变量,考虑材料成本约束和配筋率等约束,融合结构层间位移角分布和梁柱构件转角大小,提出了基于优化准则法的RC框架结构均匀损伤优化设计方法。基于非线性温克尔地基梁模型(BNWF),建立了能够考虑土-结构相互作用的RC框架结构分析模型。以两个5层和12层结构为例,研究了收敛参数对收敛速度和收敛稳定性的影响规律,分析了优化过程中各楼层配筋转移情况,对比了优化前、后结构的梁柱转角大小和层间位移角分布。结果表明,该文优化方法可使结构的损伤分布更加均匀,降低结构的最大层间位移角,提高结构的抗震能力。

     

    Abstract: The seismic failure mode of uniform damage refers to that the structure has a uniform damage and story drift along the height and develops a global energy dissipation mechanism, and it is an ideal and expected failure mode. A uniform damage-based seismic optimization design approach for RC frame structures considering the soil-structure interaction is proposed. By taking the uniformity of maximum inter-story drift ratio (IDR) as the design objective, the seismic optimization design approach was developed. Moreover, the optimization procedure accounted for the IDR distribution and component rotation demands. The component’s sectional reinforcements were selected as the design variables, and the material cost and the reinforcement ratio were considered as the design constraints. Based on the Beam on Nonlinear Winkler Foundation (BNWF) model, the numerical model of the RC frame structure considering soil-structure interaction was established. Two RC frame structures with 5 and 12 stories were employed as the prototype structures. The effects of convergence parameters on the convergence speed and stability were investigated. The transfer of story reinforcements in the optimization was studied. The change of component rotation and IDR distribution after the optimization was analyzed. The analytical results indicate that the developed approach can achieve a uniform IDR distribution and a smaller maximum IDR, thus improving the seismic performance.

     

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