Damage Mechanism and Prevention Countermeasures of HDPE
Protecting Sheath of Stayed Cables

doi:10.3969/j.issn.1674-0696.2013.sup.1.38

Abstract

Abstract: The temperature gradient is formed when the sun is shining on the HDPE sheath of conventional stay-cables，and the non-uniform deformation is formed on the cross-section of the sheath． In addition to both anchoring ends，the long seamless sheath structure form leads to produce ring and longitudinal cracks inevitably． The common protection method of staycables breakage mechanism and typical stayed cables protective layer structure were analyzed in theoretically．Ｒigid transition layer and sunshade system were added into the protection sheath as structural measures． The proposed method can reduce the amplitude of HDPE tube stress，prolong the service life of stayed cables protection sheath and save the maintenance costs．

Key words: High Density Polyethylene ( HDPE) , stayed cable, cable sheath, damage mechanism, rigid transition layer; durability

摘要： 阳光照射在常规斜拉索HDPE护套上形成温度梯度，在截面上护套形成不均匀变形，除两锚固端外，通常无缝的护套结构形式导致其不可避免的产生环向及纵向裂纹。对常见的斜拉索防护套破损机理以及典型的斜拉索防护层结构进行了理论分析，提出了增加刚性过渡层的防护套构造措施。增设遮阳系统，可降低HDPE管的应力幅值，有效地延长斜拉索防护套的使用寿命，节约养护维修成本。

关键词: 高密度聚乙烯, 斜拉索, 护套, 损伤机理, 刚性过渡层, 耐久性

CLC Number:

U443.3
TU997

Liu Shanhong. Damage Mechanism and Prevention Countermeasures of HDPE Protecting Sheath of Stayed Cables[J]. Journal of Chongqing Jiaotong University(Natural Science), 2013, 32(增1): 888-893.

刘山洪. 斜拉索HDPE防护套的损伤机理及预防对策研究[J]. 重庆交通大学学报（自然科学版）, 2013, 32(增1): 888-893.

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Damage Mechanism and Prevention Countermeasures of HDPE Protecting Sheath of Stayed Cables

斜拉索HDPE防护套的损伤机理及预防对策研究

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