基于重力失真的钢管混凝土单圆管拱模型振动台试验研究

Shaking table test of concrete-filled steel tubular single arch rib model based on gravity distortion

摘要

在振动台试验中，欠人工质量模型的重力失真效应会显著影响试验的有效性和准确性。本文以1∶10缩尺的钢管混凝土单圆管拱模型为研究对象，通过设置5种重力失真度η_i和5种El Centro波频率比K_i，开展振动台试验，探讨重力失真对结构位移和应变响应的影响。研究表明，重力失真显著影响位移响应，低频激励下重力失真度与拱顶位移呈负相关，而高频激励时可忽略重力影响。重力失真效应会显著降低拱脚轴向应变响应，且其影响程度随失真度增大而增强。顺桥向激励下的位移和应变响应主要受重力失真度影响，而横桥向激励则受重力失真度和频率比共同影响。因此，在进行欠人工质量模型设计时，应考虑重力失真效应的影响。

Abstract

In shaking table tests, the gravity distortion effect of underweight artificial mass models can significantly affect the validity and accuracy of the experiments. This study focuses on a 1∶10 scale concrete-filled steel tubular single circular arch rib model, conducting shaking table tests by setting five gravity distortion ratios η _i and five El Centro earthquake wave frequency ratios K _i to explore the influence of gravity distortion on structural displacement and strain responses. The research reveals that gravity distortion notably affects displacement responses: under low-frequency excitation, the gravity distortion ratio is negatively correlated with crown displacement, whereas its influence can be neglected under high-frequency excitation. The gravity distortion effect significantly reduces the axial strain response at the arch foot, with its impact intensifying as the distortion ratio increases. Displacement and strain responses under longitudinal bridge excitation are primarily influenced by the gravity distortion ratio, while transverse bridge excitation is jointly affected by both the gravity distortion ratio and frequency ratio. Therefore, the gravity distortion effect should be considered in the design of underweight artificial mass models.

关键词

桥梁工程 / 重力失真 / 振动台试验 / 欠人工质量模型 / 单圆管拱模型 / 频率比

Key words

bridge engineering / gravity distortion / shaking table test / underweight artificial mass model / single tubular arch rib model / frequency ratio

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基金资助

福建省高校产学合作项目(2024Y4002)

福建省交通科技项目(SF20230202)