- 摘 要
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(中鐵第四勘察設計院集團有限公司, 武漢 430063)
摘要: 現(xiàn)有 RC 梁結構靜力損傷識別方法存在獲取信息量少、誤差容許能力差等問題,導致其難以準確反映結構損傷位置和損傷程度。 基于此,提出了一種基于靜力特性的 RC 梁結構損傷識別方法。 首先根據(jù)應變差值理論公式和小波變換理論,基于梁的靜力特性建立 RC 梁的損傷定位和損傷程度定量的識別方法。 然后采用有限元軟件ABAQUS 建立鋼筋混凝土簡支梁模型,利用有限元單元剛度下降模擬梁結構損傷,并基于損傷位置的敏感度對方法進行修正。 最后開展了 1 根未損傷梁和 4 根預損傷梁的靜力試驗,對損傷識別方法進行了驗證。 結果表明:損傷指標值在損傷位置處產(chǎn)生峰值,且其值與損傷程度呈正相關。 該損傷識別方法不僅能夠準確地識別損傷出現(xiàn)的位置,而且能夠得到與實際相符的損傷程度識別結果。
關鍵詞: RC 梁結構; 損傷識別; 靜力特性; 小波變換; 有限元分析; 靜力試驗
中圖分類號:TU375. 1 文獻標志碼:A 文章編號:1002-848X(2022)24-0088-05
DOI:10. 19701 / j. jzjg. 20210436
Research on damage identification method of RC beam structure based on static characteristics
SHEN Lei
(China Railway Siyuan Survey and Design Group Co. , Ltd. , Wuhan 430063, China)
Abstract: The existing static damage identification methods for RC beam structures have problems such as less informationand poor error tolerance, which make it difficult to accurately reflect the location and extent of structural damage. Based onthis, a damage identification method of RC beam structure based on static characteristics was proposed. Firstly, accordingto the strain difference theory formula and wavelet transform theory, based on the static characteristics of the beam, thedamage location and quantitative damage degree identification methods of RC beams were established. Then the reinforcedconcrete simply supported beam model was established by using the finite element software ABAQUS, and the damage ofthe beam structure was simulated by using the stiffness decline of the finite element, and the method was modified based onthe sensitivity of the damage location. Finally, the static tests of 1 undamaged beam and 4 pre-damaged beams were carriedout to verify the damage identification method. The results show that the damage index value has a peak value at the damagelocation, and its value is positively correlated with the damage degree. The damage identification method can not onlyaccurately identify the location of the damage, but also obtain the damage degree identification results consistent with theactual situation.
Keywords:RC beam structure; damage identification; static characteristic; wavelet transform; finite element analysis;static test
∗國家重點研發(fā)計劃(2016YFC0802205)。
第一作者:沈磊,碩士,高級工程師,一級注冊結構工程師,主要從事大跨、高層結構設計工作,Email:316789796@ qq. com。
[引用本文] 沈磊. 基于靜力特性的 RC 梁結構損傷識別方法研究[ J]. 建筑結構,2022,52( 24):88-92,125.SHEN Lei. Research on damage identification method of RC beam structure based on static characteristics[ J]. BuildingStructure,2022,52(24):88-92,125.
