竹竿体锚杆竿体最大拉拔荷载研究  

Study on the maximum tensile load of bamboo rod anchor bodies

作　　者：郭敬一 杨生贵 滑鹏林 杨鹏程 黄世卿 Guo Jingyi;Yang Shenggui;Hua Penglin;Yang Pengcheng;Huang Shiqing(China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013

出　　处：《建筑科学》2025年第1期33-38,共6页Building Science

摘　　要：在基坑工程中,锚杆杆体的承载力对锚杆性能至关重要,为了解竹竿体锚杆竿体可承受的最大拉拔荷载并对其替代传统基坑锚杆杆体的可行性进行评价,对工程中常用的四年生毛竹竿不同纵向位置的顺纹抗拉强度、围径、壁厚进行了相关的试验,对竹竿尺寸、顺纹抗拉强度沿竹竿纵向的变化规律进行分析,推测竹竿全截面断裂荷载沿竹竿纵向的变化规律。结果表明:竹竿节间段的截面积与竹节部位的截面积均随到基部距离的增加而减小;竹竿节间段的顺纹抗拉强度随到基部距离的增加而增大;竹竿竹节部位的顺纹抗拉强度与位置的相关性不明显,但明显低于与其相邻的节间段的顺纹抗拉强度;竹竿全截面断裂荷载随到基部距离的增加而减小,节间段全截面断裂荷载与竹节处全截面断裂荷载差异并不明显。当本次试验选用竹竿整体受拉时,其稍部为薄弱点,竹竿整体可承受最大拉拔荷载为366.64kN,可替代单根Φ^(s)15.2钢绞线或单根Φ^(s)17.8钢绞线作为基坑用锚杆杆体。In foundation pit engineering,the bearing capacity of the anchor rod body is crucial to the performance of the anchor rod.To evaluate the maximum tensile load that a bamboo rod anchor body can withstand and its feasibility as a substitute for traditional foundation pit anchor rod bodies,tests are conducted on the tensile strength along the grain,circumference,and wall thickness of different longitudinal positions of four-year-old bamboo rods commonly used in engineering.The variation patterns of bamboo rod dimensions and tensile strength along the grain along the length of the bamboo rod are analyzed to predict the variation patterns of the full cross-section fracture load of the bamboo rod along its length.The results show that the cross-sectional area of the bamboo rod internode sections and node sections decrease with increasing distance from the base;the tensile strength along the grain of the bamboo rod internode sections increases with increasing distance from the base;the tensile strength along the grain of the bamboo rod node sections has no significant correlation with position but is significantly lower than that of the adjacent internode sections;the full cross-section fracture load of the bamboo rod decreased with increasing distance from the base,and the difference between the full cross-section fracture load of the internode sections and the node sections is not significant.When the bamboo rod is subjected to overall tensile force in this experiment,its tip is the weak point,and the bamboo rod could withstand a maximum tensile load of 366.64kN.It can replace a single Φ^(s)15.2 steel strand or a single Φ^(s)17.8 steel strand as the anchor rod body for foundation pits.

关 键 词：竹竿体锚杆 最大拉拔荷载 尺寸强度的变化规律 

分 类 号：TU318[建筑科学—结构工程]