加大截面法砼工程加固技术相关规定

更新时间:2023-05-10 03:24:17 阅读: 评论:0

加大截面法砼工程加固技术相关规定
设计规定
1 本方法适用于钢筋混凝土受弯和受压构件的加固。
2 采用本方法时,按现场检测结果确定的原构件混凝土强度等级应不低于C10。
3 加固设计时,应核算原构件的应力水平βk:
βk =S k / R k
式中:S k——原构件荷载效应的标准值;
R k——原构件抗力的标准值。
若按上式算得的βk值超出表1.3的限值,应在加荷前进行卸荷。
表3 原构件应力水平限值
应力种类 应力水平βk的限值
轴心受压、小偏心受压、斜截面受剪 0.80
大偏心受压 0.90
4 当被加固构件界面处理及其施工质量符合本规范要求时,可按整体截面计算。
5 采用增大截面加固钢筋混凝土结构构件时,其承载力的计算,除应符合现行设计规范GB50010的基本假定外,尚应符合本章节的补充规定和要求。
受弯构件正截面加固计算
1 采用增大截面加固受弯构件时,应根据原结构构造和受力的实际情况,选用在受压区或受拉区增设现浇钢筋混凝土外加层的加固方式。
2 当仅在受压区加固受弯构件时,其承载力、抗裂度、钢筋应力、裂缝宽度及挠度的计算和验算,可按现行设计规范GB 50010关于叠合层即可满足承载力的要求时,也应按构造要求配置受压钢筋和分布钢筋。
3 当在受拉区加固矩形截面受用弯构件时,其正截面受弯承载力应符合下列规定:
图2.3 受弯构件加固计算图形
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