钢丝脆断后钢绞线吊杆对称断丝力学行为

发布时间：2018-02-23 19:17

本文关键词： 拱桥吊杆力学行为内力重分布规律影响长度　出处：《同济大学学报(自然科学版)》2014年04期 　论文类型：期刊论文

【摘要】：基于断丝前后吊杆两端边界位移约束条件不变的相容条件,确立对称钢丝脆断后钢绞线吊杆截面内力重分布规律,并推导对称断丝后钢丝应变与影响长度、吊杆拉力损失率之间的关系表达式.结果表明:对称断丝后,在影响长度内各钢丝拉力分布不均匀,与断丝相邻的外层未断钢丝拉力增大,而与断丝相对的钢丝拉力减小,其余钢丝拉力变化不显著;在影响长度外,各钢丝拉力分布又变为均匀.随到断裂处距离的增加,断丝拉力呈指数或线性增加,而与断丝相邻钢丝则呈指数或线性衰减.在影响长度范围内,钢绞线拉力损失率基本为一限值,略低于钢绞线内钢丝断丝率,而护套握裹力、摩擦力等对吊杆内力重分布影响显著.
[Abstract]:Based on the consistent condition that the boundary displacement of the suspension rod before and after breaking is invariant, the internal force redistribution law of the suspension rod section after the breakage of symmetrical steel wire is established, and the strain and the influence length of the steel wire after the symmetrical wire break are deduced. The results show that after symmetrical wire breaking, the tensile force distribution of each wire is not uniform, the tensile force of the outer layer adjacent to the broken wire increases, while the wire tension relative to the broken wire decreases. Besides the influence length, the tensile force distribution of each wire becomes uniform. With the increase of distance from fracture to fracture, the tensile force of broken wire increases exponentially or linearly. In the range of influence length, the loss rate of tensile force of steel strand is basically a limited value, which is slightly lower than that of wire break rate in steel strand, and the holding force of sheath, Friction has a significant effect on the redistribution of the internal force of the suspender.
【作者单位】：同济大学土木工程学院;南通市公路管理处;
【基金】：江苏省交通科学研究计划(20131157)
【分类号】：U448.22

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