装配式山地掉层框架-摇摆墙结构的地震反应特性

Seismic response characteristics of prefabricated step-terrace frame-rocking wall structure in mountain cities

摘要

掉层框架结构存在严重的侧向刚度不规则和楼层承载力突变以及上接地层变形集中的问题。摇摆墙可以控制结构的整体变形模式和塑性耗能的分布，抑制薄弱层产生。本文基于一种可更换耗能连接装置的装配式梁柱连接节点，以装配式山地掉层框架-摇摆墙结构为研究对象，采用增量动力时程分析(incremental dynamic analysis，IDA)，针对IDA曲线簇、分位曲线、地震概率需求模型、易损性函数、破坏状态概率、易损性指数、抗倒塌储备系数和安全裕度比等方面，系统地探讨了装配式山地掉层框架-摇摆墙结构体系的易损性。结果表明，相同地震动峰值加速度(peak ground acceleration，PGA)的地震激励下，摇摆墙可以限制结构塑性发展深度，降低峰值响应离散性和各性能水准的超越概率，抗倒塌性能良好。装配式山地掉层框架结构在梁端耗能构件处存在削弱，使结构整体性和承载能力弱于现浇山地掉层框架结构，而附加摇摆墙可以增强装配式山地掉层框架结构的承载能力、整体刚度以及延性，减轻结构损伤程度，增强了结构的耗能能力，使得装配式山地掉层框架-摇摆墙结构的抗震性能更加优越。相同水平的地震作用下，附加摇摆墙可以防止装配式山地掉层结构上接地层的变形集中问题，限制结构塑性过分发展，降低了最大层间位移角的离散性和各性能水准下结构的超越概率，有效提升装配式山地掉层结构抗震性能和抗倒塌性能。

Abstract

There are serious problems of irregular lateral stiffness, sudden change of floor bearing capacity and concentrated deformation of the upper ground layer in the step-terrace frame structure. The additional rocking wall has the advantages of controlling deformation mode and preventing weak story. Based on an assembled beam column connection node with a replaceable energy consuming connection device, this paper took the prefabricated step-terrace frame-rocking wall structure as the research object. The Fragility of step-terrace frame-rocking wall structure was investigated systematically through incremental dynamic analysis (IDA), with respect to IDA curve clusters, partition curves, seismic probability demand models, susceptibility functions, damage state probabilities, susceptibility indices, collapse resistance reserve factors and safety margin ratios. The results indicate that under seismic excitations with the same peak ground acceleration (PGA), rocking walls can limit the depth of structural plasticity development, reduce the dispersion of peak responses, and lower the probability of exceeding various performance levels, thereby exhibiting good collapse resistance. The prefabricated step-terrace frame structure is weakened at the energy dissipating components at the beam end, resulting in weaker structural integrity and load-bearing capacity than the cast-in-place step-terrace frame structure. However, the addition of rocking walls can enhance the load-bearing capacity, overall stiffness, and ductility of the prefabricated step-terrace frame structure, reduce structural damage, enhance the energy dissipation capacity of the structure, and make the seismic performance of the prefabricated step-terrace frame swinging wall structure more superior. Under seismic excitations with the same PGA, the additional rocking wall can prevent the deformation concentration problem of the upper grounding layer on the prefabricated step-terrace structure, limit the excessive development of structural plasticity, reduce the discreteness of the maximum interstory displacement angle and the exceedance probability of the structure at various performance levels, and effectively improve the seismic and collapse resistance of the prefabricated step-terrace structure.

关键词

易损性 / 装配式，掉层框架-摇摆墙结构 / IDA分析

Key words

seismic fragility / prefabricated / step-terrace frame-rocking wall structure / IDA analysis

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基金资助

重庆市建设科技计划项目(城科字2023第3-14号)