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单双向压弯作用下矩形空心桥墩抗震性能比较

, PP. 62-68

Keywords: 空心桥墩,双向弯曲,试验研究,抗震性能

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Abstract:

通过恒定轴力下的水平单向加载拟静力试验和双向加载拟静力试验,研究了矩形空心桥墩在单、双向压弯作用下抗震性能的差异,重点比较了其在不同加载条件下的受力过程、破坏机理、滞回特性、承载能力、延性和耗能能力。结果表明单、双向压弯作用下,各矩形空心截面试件的破坏形态均为整体弯曲破坏,但在双向耦合作用影响下,双向压弯墩柱的承载能力、变形能力、延性严重削弱,双向压弯墩柱的累积总耗能也远小于单向压弯墩柱。初步研究结果显示,仅考虑水平单向地震作用情形分析矩形空心桥墩的抗震能力可能偏于不安全。

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