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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s, including foreign currency loans, trade finance, bank acceptances, commercial bill discounting, guarantees, factoring, credit, loan commitment, guarantee and other credit operations, excluding client credit business. Prior to the chengdai investigation into the fourth article this refers to credit before the review, investigators by obtaining, verification, analysis and curity aspects of the situation, evaluation and reveals the possible credit risks and to propo preventive measures. Article fifth due diligence in the measures refers to the person in the pre-loan investigation procedures fulfilling the most basic due diligence requirements. Article sixth of themlves, pre-loan investigators relatives or other interested person to apply for the credit business, one should apply for the withdrawal. Chapter II due diligence due diligence work is the basic requirement of the venth article: follow the principles of true, complete, valid, and diligence due diligence in carrying out investigation duties. Investigators should be bad on the characteristics of different varieties of credit business, credit
