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APPRAISAL OF CRACKS ON CONCRETE SHORT COLUMNS OF A FRAME AND RESEARCH ON RETROFITTING MEASURES
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摘要: 对日照某沿街楼混凝土框架短柱出现斜向贯通裂缝进行了现场勘查,利用回弹法和钻芯法检测评定了混凝土短柱强度。并取横向一榀框架为结构计算单元,将车库楼盖温度变形作用附加于横向框架,并以是否考虑回填土的侧向约束的影响,利用SAP2000结构软件分析两种情况下的结构内力,最终给出了混凝土短柱斜裂缝的出现原因,并对受损的混凝土柱给出了相应的加固修复对策,可为同类工程检测鉴定与加固处理提供依据。Abstract: A field inspection was done for the diagonal cracks on the short columns of R. C frame for a street building in Rizhao city. The structure concrete strength was detected by rebounding methed and drilled concrete samples. A transverse frame was taken as the structure calculation unit,temperature deformation of the garage floor was attached to the horizontal frame,then the structure internal force was analyzed by SAP2000 under the case of taking account of lateral restraint influence of backfill,and the case without this consideration. In the end,the reason of the cracks on the R. C colunms had been found out. The retrofitting measures were put forward for damaged R. C columns,which can provide a basis for appraisal and strengthening of similar projects.
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Key words:
- Ｒ. C column /
- diagonal crack /
- structure stress analysis /
- inspection and appraisal /
- retrofitting
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