改善吊索钢丝绳内部受力状态的研究

为降低大桥吊索用粗直径钢丝绳的疲劳断丝率,对钢丝绳的结构设计和生产工艺进行研究。研究选用8×55SWS+IWR结构、直径88 mm钢丝绳。在保持钢丝绳结构和直径的情况下,改变绳芯结构和增加填充物,先后采用绳芯结构为6×36SW+1×55SWS和6×16W+6×36SW+1×55SWS;对具有6×16W+6×36SW+1×55SWS绳芯结构的钢丝绳,又分为无填充物、外层股与绳芯间有改性塑胶填充物、各股层之间都有改性塑胶填充物。测量不同情况下钢丝绳的疲劳断丝率等性能指标,结果显示:经2×106次脉冲循环加载试验后,具有6×16W+6×36SW+1×55SWS绳芯结构的各股层之间都填改性塑胶的吊索钢丝绳断丝率小于5%,符合JT/T449—2001《公路悬索桥吊索》的规定。对研究结果进行分析讨论。

Research to improve strained condition in wire rope for sling

In order to decrease fatigue wire breaking rate of large diameter wire rope for big bridge sling, the structure design and technology of wire rope are researched. Adopting 8×55SWS ＋ IWR structure diameter 88 mm wire rope to research. Under condition of keeping wire rope structure and diameter to change rope core structure and to add padding, adopted rope core structure was 6×36SW ＋ 1×55SWS and 6 ×16W ＋6×36SW ＋ 1×55SWS first and last; the wire rope with 6 × 16W ＋ 6 × 36SW ＋ 1 × 55SWS rope core structure was divided into without padding, modified plastic cement padding between out layer strands and rope core, modified plastic cement padding among every strands. Measuring property index such as fatigue wire breaking rate of wire rope in the different conditions, the results show that wire breaking rate of sling wire rope with 6 ×16W ＋ 6 × 36SW ＋ 1 × 55SWS core structure and modified plastic cement padding among every strands are less than 5% after 2 × 10^6 times pulse cyclic loading test, which satisfy the provision of JT/T449-2001 highway suspension bridge sling. The research result was analyzed and discussed.