基于挠度影响线差的钢-混凝土组合梁损伤识别方法研究

Research on Damage Identification Method of Steel-Concrete Composite Beam Based on Difference of Deflection Influence Line

摘要

为识别钢梁或混凝土板的截面损伤,推导了任意截面的挠度影响线的表达式,基于损伤前后挠度影响线差及其二次差分进行了损伤识别,并通过有限元分析及模型试验进行了验证,最后提出了基于运营阶段对称挠度影响线差及其二次差分的损伤识别方法。研究表明:可通过损伤前后挠度影响线差曲线的拐点或其二次差分曲线的峰值对损伤进行定位;挠度影响线差及其二次差分均随损伤程度和损伤区域长度近似呈线性增长。模型试验显示,挠度影响线差较其二次差分的损伤识别效果更好,且基于运营阶段对称挠度影响线差及其二次差分的识别方法无需损伤前的挠度数据。

Abstract

To address sectional damage occurring in either the steel girder or the concrete slab, this paper derived the Deflection Influence Line (DIL) for an arbitrary cross-section. Damage identification was performed based on the difference of DIL (DDIL) before and after damage and its second-order difference, and the method was then validated through finite element analysis and model tests. Finally, a damage identification method using the symmetric DDIL and its second-order difference under service conditions was proposed. The results show that damage localization can be achieved by identifying the inflection point of the DDIL curve or the peak on its second-order difference curve. Both the DDIL and its second-order difference increase approximately linearly with increasing damage severity and damage length. Model tests indicate that the DDIL yields better damage identification performance than its second-order difference. The proposed method based solely on the symmetric DDIL and its second-order difference under service conditions does not require pre-damage deflection data.

关键词

钢-混凝土组合梁 / 损伤识别 / 挠度影响线 / 挠度影响线差 / 挠度影响线差二次差分

Key words

steel-concrete composite beam / damage identification / Deflection Influence Line (DIL) / Difference of Deflection Influence Line (DDIL) / second-order difference of DDIL

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基金资助

国家自然科学基金资助项目(51778377)

中央引导地方科技发展资金项目(246Z5409G)