保护站受力分析
http://www.shariconglobal.com/misc/climbing/A_Look_at_Load-Distributing_and_Load-Sharing_Anchor_Systems.pdf几个不靠谱的锚点怎么连也很难均衡受力,每一个都必须牢靠。
缩短当一个锚点失效后带来的冲坠距离。
Will Gadd 的分析:
http://gravsports.blogspot.com/2010/03/maybe-better-to-limit-anchor-extension.html
http://gravsports.blogspot.com/2010/03/equalizationextension-in-anchors-post-2.html
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