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悬索桥隧道式锚碇横断面形状对其承载性能影响

DOI: 10.3969/j.issn.1674-0696.2012.04.05, PP. 755-759

Keywords: 悬索桥,隧道式锚碇,横断面形状,数值模拟,极限承载力,suspensionbridge,tunnelanchorage,crosssectiontype,finiteelementmethod,ultimatebearingcapacity

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Abstract:

:?应用有限元软件ABAQUS对比分析了马蹄形和圆形两种横断面隧道式锚碇的承载性能。围岩及锚碇采用实体单元模拟,围岩与锚碇之间设置接触面单元;围岩采用扩展的Mohr-Coulomb屈服模型;使用超载法分析锚碇的极限承载能力。计算结果表明:马蹄形断面在边墙与拱以及边墙与底板的交界处出现较大应力集中,圆形断面应力分布均匀;在断面面积相等的情况下,相同缆力作用下圆形断面锚碇位移小于马蹄形锚碇约22%,极限承载力高出马蹄形锚碇约18%,说明圆形断面承载性能优于马蹄形断面。

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