软土场地下土与结构相互作用BRB混凝土框架抗震性能研究

Seismic analysis of the reinforced concrete frame structure considering soft soil-structure interaction

国内外结构的抗震设计中均沿用刚性地基的假定,这是为了简化抗震计算而作的近似,在地震作用下上部结构与其支承介质——土壤之间存在着相互依赖、相互影响的关系,土-结构相互作用(Soil-Structure Interaction)是影响结构地震响应和损伤的重要因素。屈曲约束支撑BRB(Bucking Restrained Brace)作为一种消能减震构件,在小震下作为普通支撑提供侧向刚度,强震下作为一道抗震防线,先于主要构件产生屈服变形耗散地震能量,从而有效地保护强震中主体结构免于损坏至关重要。本文分别选取原结构、BRB结构和SSI-BRB结构三种体系,分析罕遇地震作用下结构体系的抗震性能,考虑SSI效应时,BRB变形能力有明显的改善。BRB结构、SSI-BRB结构的耗能能力提高。

The seismic design the structure assumption that the basic is rigid foundation, this method will simplify the earthquake- resistant calculation, however, the relationship between soil and structure rely on each other mutual and influence the effects of earthquake and its supporting media, soil structure interaction is a important factor to earthquake response and damage of the structure. Bucking Restrained Brace is a vibration-suppressing device, in small earthquakes as ordinary brace to provide lateral stiffness resistance to the structure, under rare earthquake the BRB prior to major components and produce yield deformation to dissipation seismic energy. Protect the structure damage,we select the original structure BRB structure and SSI-BRB structure, analysis the resistant behavior and the action of the structure under the rarely met earthquake. When consider the SSI effect, BRB will improve the deformation ability of the structure,enhance the dissipation capability of the BRB structure and SSI-BRB structure.