全长黏结螺纹玻璃纤维增强聚合物抗浮锚杆蠕变试验研究

 通过4根全长黏结螺纹GFRP抗浮锚杆在长期荷载作用下的拉拔蠕变试验，研究了GFRP抗浮锚杆抗拔蠕变力学模型，计算出模型中的蠕变参数并对模型的正确性进行验证。另外，引入时间损伤效应的概念，结合蠕变力学模型推导出GFRP抗浮锚杆的长期抗拔力。结果表明，中风化花岗岩中GFRP抗浮锚杆在40%的极限荷载下才发生蠕变，GFRP锚杆在低荷载水平下蠕变性能优良，能够满足工程需要；Burgers力学模型能够很好的描述GFRP抗浮锚杆的蠕变规律，模型预测结果与试验结果具有较好的吻合程度，且随着拉拔荷载的增大，模型中的各力学参数均逐渐减小；建立的蠕变损伤模型用于预测GFRP抗浮锚杆的长期抗拔力具有较好的适用性。

CREEP TESTING STUDY OF FULL-LENGTH BONDING THREAD GLASS FIBER REINFORCED POLYMER ANTI-FLOATING ANCHOR

Based on four pull-out creep tests of full-length bonding thread GFRP anti-floating anchors under long-term load，the creep mechanics model of pulling anchor has been established，and the creep mechanics parameters of the model were derived and the correctness of the model was validated in this paper. In addition，the concepts of the time damage effect were developed; the long-term pull-out strength of GFRP anti-floating anchor has been obtained. The experimental results demonstrate that， in moderately weathered granite，creep behavior of GFRP anti-floating anchors occurred under the ultimate load of 40%，and the creep properties of GFRP anti-floating anchor are excellent under the low load level which meets the needs of projects. The Burgers model can well describe the creep law of GFRP anti-floating anchors，and the predicted results are consistent with the experimental results，and that the mechanical parameters in the Burgers model are reduced gradually with the increase of drawing load. It has better applicability that creep damage model is used to predict the long-term pull-out strength of GFRP anti-floating anchors.