花岗岩石材植筋锚固性能试验

Experimental Study on the Anchorage Performance of Steel Bar Planted into Granite Stone

花岗岩石材植入钢筋的锚固性能和最小锚固长度,是石结构植筋加固的关键问题.开展30个花岗岩石材植筋锚固性能拔出试验,研究锚固长度、植筋胶种类和钢筋表面特征等因素对花岗岩石材植筋锚固性能的影响.试验结果表明:钢筋与花岗岩石材粘结强度随锚固长度的增大而减小;采用带肋钢筋能够在一定程度上提高锚固钢筋的粘结强度;环氧型植筋胶的锚固性能明显优于水泥基植筋胶的锚固性能.使用环氧型植筋胶对带肋钢筋和花岗岩进行植筋锚固时,建议工程应用的最小锚固长度为7d(d为钢筋直径),进行光圆钢筋和花岗岩的植筋锚固时,建议工程应用的最小锚固长度为10d.

The anchorage performance and minimum anchorage length are key points of steel planting in strengthening stone members. A total of 30 pull-out tests were conducted to investigate the effect of anchorage length, adhesive type, and characteristic of bar surface on the anchorage performance of steel bars planted into granite stone. Test results show that, the anchorage strength between the steel bar and the stone decreases as the anchorage length increases; the anchor- age strength of ribbed steel bars is higher than the one of plain steel bars; the anchorage performance of epoxy adhesive is better than the one of cement adhesive. Based on the test results, a minimum anchorage length of 7d （d=bar diameter） is recommended for the ribbed steel bars planted into granite stone using epoxy as the anchorage agent, 10d for the plain steel bars.