考虑自由段受荷的锚杆变形和承载特性研究  

Research on the Deformation and Bearing Characteristics of Anchor Considering the Load Bearing of Free Section

作　　者：刘晓明[1] 张亮亮[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2012年第6期7-12,共6页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50808076)

摘　　要：针对锚杆端部的拉拔荷载由锚固段的锚固体和自由段的锚固体共同承受的特点,采用反映土锚界面抗剪强度衰减的双折线模型,基于荷载传递理论推导得到锚杆抗拔力与位移之间的解析关系式,工程实例计算结果验证了理论推导的正确性.计算结果表明:自由段受荷后对锚杆的刚度和承载力都有明显的提高,且随着自由段长度的增加,其承载力会有所提高,但锚杆整体刚度却在降低,因此在预应力锚杆的设计与施工中应合理地选择自由段长度.Considering the common load bearing features of free section and anchoring section of the prestressed anchor bolt and using the double broken line model, which can present the damping properties of the soil-bolt surface strength, the analytical solutions between bolt resistance force and displacement was obtained based on the load transfer theory. Engineering example analysis verified the correctness of the theoretical derivation. The calculation results indicate that the stiffness and strength of the prestressed bolt are improved when the bearing capacity of free section is taken into account. The calculation results also show that the bearing capacity of the whole bolt increases, but the stiffness decreases on the contrary, while the free section length increases. So it is important prestressed anchor bolts design and construction. to determine the rational length of free section in

关 键 词：基础工程 预应力锚杆 荷载传递法 剪切变形 

分 类 号：TU470.3[建筑科学—结构工程]