白久林 刘明辉 孙博豪 陈辉明

摘 要：结构在强震下形成均匀损伤状态时，各楼层的层间侧向变形近似相等、损伤大小相同，结构各部位的材料性能均得到充分发挥，易于形成整体化的屈服模式和耗能机制。基于优化准则法，考虑结构的整体损伤和局部损伤大小，构建了钢筋混凝土框架结构地震均匀损伤优化设计程序;基于非线性温克尔地基梁模型（BNWF），建立了能够考虑土结构动力相互作用的钢筋混凝土框架结构分析模型。分别以5层和8层结构为例，对其进行均匀损伤优化设计和关键收敛参数分析，对比研究了优化前后结构配筋、梁柱转角和结构最大层间位移角的变化情况。基于两个均匀损伤优化设计结构的层剪力分布，以中国抗震规范的侧向力模式为基础，提出了新型抗震设计侧向力模式。

关键词：均匀损伤;侧向力模式;钢筋混凝土结构;框架结构;土结构相互作用;优化准则法

中图分类号：TU375.4;TU311.3 文献标志码：A 文章编号：2096-6717（2021）03-0001-08

Abstract： When the uniform damage state of structures is developed under strong earthquakes， each story has an approximately equal story drift ratio and damage， and the material potential of each structural components is fully exploited， which makes for the global yielding mode and energy dissipation mechanism. By considering the global and local damage， the optimization design procedure of seismic uniform damage of reinforced concrete frame structures was firstly constructed based on the optimality criteria method. The analytical model of reinforced concrete frame structures considering the soil-structure-interaction was developed based on the Beam on Nonlinear Winkler Foundation （BNWF） model. Two 5-and 8-reinforced concrete （RC） frame structures were employed as the prototype structures. The uniform damage optimization design was performed and the influence of main convergence parameters were analyzed. The structural reinforcements， component rotations and maximum interstory drift ratio before and after optimization were compared. According to the story shear distribution of two optimized RC frames， a new lateral force pattern for seismic design was proposed using the format of Chinese seismic design code.

Keywords：uniform damage; lateral force pattern; reinforced concrete structures; frame structures; soil-structure interaction; optimality criteria method

傳统结构抗震设计是根据作用在其上的侧向力进行内力分析和能力设计来获得结构沿高度的强度和刚度分布，因此，结构在强震下的抗震响应与结构的设计侧向力模式密切相关。目前，各国规范均建议了结构抗震设计时的侧向力模式。以规范体系为代表的侧向力模式，主要基于结构弹性振动状态时的楼层惯性力分布获得，其表达式相对简便，在实际设计时工程师便于应用，能很好地满足结构在小震弹性状态下的抗震性能要求。……