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(1 陜西省建筑科學研究院有限公司, 西安 710082; 2 長安大學建筑工程學院, 西安 710061)
摘要: 混凝土無支撐置換加固法因其具有諸多優(yōu)點,常用于混凝土強度過低的項目. 但無支撐置換加固技術(shù)設(shè)計難度大,施工過程中安全風險較高,而規(guī)范對于無支撐置換加固方案還未形成統(tǒng)一的設(shè)計理論和施工技術(shù)總結(jié).根據(jù)某高層混凝土剪力墻無支撐分段置換工程及監(jiān)測數(shù)據(jù),深入揭示了混凝土置換加固過程中置換剪力墻、與置換剪力墻相連的梁板等結(jié)構(gòu)的受力變化規(guī)律. 監(jiān)測數(shù)據(jù)表明,墻段拆除施工會使得梁板應(yīng)變增長,但增長值有限,而由于墻段澆筑時間的差異,使得先后加固的墻段出現(xiàn)明顯的應(yīng)力滯后現(xiàn)象,應(yīng)力滯后可能導致結(jié)構(gòu)的安全性降低,因此為了使得無支撐置換加固法具有更好的適用性,基于 ABAQUS 有限元分析軟件,采用生死單元、等效升溫法以及添加場變量的方法實現(xiàn)剪力墻施工模擬,通過施工模擬對不同軸壓比下的置換方案進行優(yōu)化設(shè)計,最后給出了具有一般性的建議施工方案.
關(guān)鍵詞: 混凝土剪力墻; 加固改造; 分段置換; 應(yīng)力滯后; 有限元分析; 施工模擬
中圖分類號:TU375. 4 文獻標志碼:A 文章編號:1002-848X(2023)11-0122-08
DOI:10. 19701 / j. jzjg. LS201938
Stress analysis and construction optimization design of unsupported replacement reinforcement of concrete shear wall
DONG Junfeng1, LEI Tuo2, LIU Yi2
(1 Shaanxi Architecture Science Research Institute Co. , Ltd. , Xi′an 710082, China; 2 School of Civil Engineering,Chang′an University, Xi′an 710061, China)
Abstract: Because of its many advantages, the method of concrete unsupported replacement reinforcement is often used inprojects with low concrete strength. However, the design of unsupported replacement reinforcement technology is difficult,and the safety risk is high during the construction process. The specification has not yet formed a unified design theory andconstruction technology summary for the unsupported replacement reinforcement scheme. Based on the unsupportedsegmented replacement engineering and monitoring data of a high-rise concrete shear wall, the stress change law of thereplacement shear wall, beams and slabs connected with the replacement shear wall in the process of concrete replacementreinforcement was deeply revealed. The monitoring data shows that the demolition of the wall section will increase the strainof the beam and slab, but the growth value is limited, and due to the difference in the pouring time of the wall section, theobvious stress hysteresis appears in the successively strengthened wall sections. The stress hysteresis may lead to reducedsafety of the structure. In order to make the unsupported replacement reinforcement method have better applicability, basedon the ABAQUS finite element analysis software, the method of life and death unit, equivalent heating and adding fieldvariables are used to realize the construction simulation of the shear wall. The replacement scheme under the coaxialpressure ratio was optimized for design, and finally a general recommended construction scheme was given.
Keywords:concrete shear wall; reinforcement and reconstruction; section replacement; stress lag; finite element analysis;construction simulation
第一作者:董軍鋒,碩士,高級工程師,主要從事結(jié)構(gòu)監(jiān)測鑒定、加固與施工研究,Email:850546074@ qq. com.
[引用本文] 董軍鋒,雷拓,劉宜. 混凝土剪力墻無支撐置換加固受力分析及施工優(yōu)化設(shè)計[ J]. 建筑結(jié)構(gòu),2023,53 ( 11 ): 122-129, 109. DONG Junfeng, LEI Tuo, LIU Yi. Stress analysis and construction optimization design ofunsupported replacement reinforcement of concrete shear wall[J]. Building Structure,2023,53(11):122-129,109.
