- 摘 要
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（1 山東建筑大學土木工程學院， 濟南 250101；2 山東建筑大學工程鑒定加固研究院， 濟南 250013）
［摘要］通過在既有鋼筋混凝土框架梁上增設后置腹板柱，改變抽柱托換后框架梁的彎矩分布圖，增加彎矩峰值點數(shù)，降低框架梁的彎矩峰值； 同時和不設置腹板柱相比，設置腹板柱會大幅度降低托換后框架梁的撓度。通過模型試驗，對比了托換前后梁的撓度、應變以及裂縫分布，分析了腹板柱的應力及內(nèi)力變化，簡述了框架柱內(nèi)力變化規(guī)律。結果表明，后置腹板柱托換結構的關鍵階段為框架柱抽除階段，其內(nèi)力、變形將出現(xiàn)突變，在考慮鋼筋混凝土框架結構抗剪、側向剛度等情況下，該加固方法可以在盡可能不降低凈空的情況下實現(xiàn)對既有框架結構的抽柱托換，為框架結構抽柱托換提供一種技術方案。
［關鍵詞］鋼筋混凝土； 框架結構； 后置腹板柱； 抽柱托換
中圖分類號：TU375文獻標識碼：A文章編號：1002-848X(2020)06-0039-07
Experimental study on reinforced concrete frame columns underpinned with post-installed web columns
Li Anqi1,2, Zhang Guoqiang2, Zhang Rui1, Su Sili1
（1 School of Civil Engineering, Shandong Jianzhu University, Jinan 250101, China;2 Engineering Research Institute of Appraisal and Strengthening, Shandong Jianzhu University, Jinan 250013, China）
Abstract:By adding post-installed web columns to the existing RC frame beam, the bending moment diagram of the frame beam is changed after the extraction column underpinning, the number of peaks on the bending moment diagram is increased and the maximum peak value of bending moment on the frame beam is reduced. Compared to the frame beam without the web columns, setting the web columns greatly reduces the deflection of the frame beam after the underpinning process. Through model test, the deflection, strain and crack distribution of beams before and after underpinning were compared, the stress and internal force changes of web column were analyzed, and the internal force change rule of frame column was briefly described. The results show that the key stage of post-installed web column underpinning structure is frame column extraction, for its internal force and deformation show sudden change. Considering the shear resistance and lateral stiffness of reinforced concrete frame structure, the reinforcement method can conduct the extraction column underpinning of existing frame structure without reducing the headroom as much as possible, and provides a technical scheme for the extraction column underpinning of the frame structure.
Keywords:reinforced concrete; frame structure; post-installed web column; extraction column underpinning
作者簡介：李安起,碩士,副教授,Email：jnaql@sdjzu.edu.cn。
