剪力墙无支撑置换加固应力滞后效应研究

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中图分类号：TU318 文献标志码：A DOI： 10.15935/j.cnki.jggcs.202504.0019

AbstractThe unsupported replacement reinforcement technology for shear wals is increasingly utilized in strengthening engineering practice. However，the design process presents significant challenges. In particular， a simple and reliable calculation method for stress hysteresis effcts remains unavailable.Based on fundamental assumptions，this studyderives a formula for calculating the stress hysteresis efect，using twostage and thre-stage replacement as representative cases.Taking an actual engineering project as a case，the replacement process of shear wals was simulated using the birth and death element technique in finite element software.Theresults demonstrate that the stress hysteresis efect formula yields valuesclosely aligned with finite element results，with a deviation within 10% . During the replacement stage，the maximum axial compression ratio occurs prior to demolishing the final batch of wals scheduled for replacement.In the service stage，the maximum axial compresson ratio manifests in the first batch of replacement walls.Adjusting wall segmentation can optimize the effectiveness of unsupported replacement reinforcement. When satisfying the maximum stress ratio requirement during the construction stage，it is more reasonable to increase the length of the first batch of replacement walls.

Keywordsshear wall，unsupported replacement，stress hysteresis，construction simulation

0 引言

钢筋混凝土结构经济、耐用、整体性好，在建筑工程中有着广泛的应用。（剩余11641字）