东南大学学报(自然科学版)
東南大學學報(自然科學版)
동남대학학보(자연과학판)
JOURNAL OF SOUTHEAST UNIVERSITY
2014年
5期
1017-1023
,共7页
钟儒勉%宗周红%谢炼%刘琦齐%樊星辰
鐘儒勉%宗週紅%謝煉%劉琦齊%樊星辰
종유면%종주홍%사련%류기제%번성신
参数离散化%损伤识别%梁式桥%全面损伤识别指标%精准损伤识别指标
參數離散化%損傷識彆%樑式橋%全麵損傷識彆指標%精準損傷識彆指標
삼수리산화%손상식별%량식교%전면손상식별지표%정준손상식별지표
parameter discretization%damage identification%girder bridge%comprehensive damage identification index%accurate damage identification index
针对梁式桥提出了一种基于参数离散化的损伤识别方法,并以结构动力指纹、实测位移、速度、结构刚度矩阵及其影响矩阵为变量,提出了全面损伤指标I1和精准损伤指标I2,通过数值模拟和实桥试验验证了该损伤识别方法的敏感性和抗噪性。结果表明,损伤指标I1和损伤指标I2均能有效实现梁式桥的损伤识别,且损伤指标I1具有更好的损伤敏感性和抗噪性,而损伤指标I2相对漏诊的可能性较低。在新沂河大桥损伤识别中,损伤指标I1能基本拟合梁式桥裂缝分布,较全面地反映出桥梁的损伤概况;而损伤指标I2对梁式桥中的重大损伤更为敏感,对于桥梁重大病害损伤识别的抗干扰性较高,能较准确反映桥梁结构的主要损伤。基于参数离散化的损伤识别方法可从本质上揭示梁式桥刚度损伤的数学形式,有效应用于梁式桥损伤识别中。
針對樑式橋提齣瞭一種基于參數離散化的損傷識彆方法,併以結構動力指紋、實測位移、速度、結構剛度矩陣及其影響矩陣為變量,提齣瞭全麵損傷指標I1和精準損傷指標I2,通過數值模擬和實橋試驗驗證瞭該損傷識彆方法的敏感性和抗譟性。結果錶明,損傷指標I1和損傷指標I2均能有效實現樑式橋的損傷識彆,且損傷指標I1具有更好的損傷敏感性和抗譟性,而損傷指標I2相對漏診的可能性較低。在新沂河大橋損傷識彆中,損傷指標I1能基本擬閤樑式橋裂縫分佈,較全麵地反映齣橋樑的損傷概況;而損傷指標I2對樑式橋中的重大損傷更為敏感,對于橋樑重大病害損傷識彆的抗榦擾性較高,能較準確反映橋樑結構的主要損傷。基于參數離散化的損傷識彆方法可從本質上揭示樑式橋剛度損傷的數學形式,有效應用于樑式橋損傷識彆中。
침대량식교제출료일충기우삼수리산화적손상식별방법,병이결구동력지문、실측위이、속도、결구강도구진급기영향구진위변량,제출료전면손상지표I1화정준손상지표I2,통과수치모의화실교시험험증료해손상식별방법적민감성화항조성。결과표명,손상지표I1화손상지표I2균능유효실현량식교적손상식별,차손상지표I1구유경호적손상민감성화항조성,이손상지표I2상대루진적가능성교저。재신기하대교손상식별중,손상지표I1능기본의합량식교렬봉분포,교전면지반영출교량적손상개황;이손상지표I2대량식교중적중대손상경위민감,대우교량중대병해손상식별적항간우성교고,능교준학반영교량결구적주요손상。기우삼수리산화적손상식별방법가종본질상게시량식교강도손상적수학형식,유효응용우량식교손상식별중。
A damage identification method based on parameter discretization is put forward for girder bridges.Taking the structural dynamic characteristics,measured displacement,velocity,structure stiffness matrix and the corresponding influence matrix as variables,the comprehensive damage iden-tification index I1 and the accurate damage identification index I2 are proposed.The sensitivity and anti-noise ability are verified by the numerical simulation and measured data.The results show that both the comprehensive damage identification index I1 and the accurate damage identification index I2 can be effectively applied in the damage identification of beam bridges.The sensitivity and the anti-noise ability of index I1 is better,and the probability of missed diagnosis of index I2 is lower.The damage identification results of Xinyihe Bridge show that index I1 can fit the distribution of fracture well and reflects the overview of damage.However,index I2 is much more sensitive to major dam-age and has an excellent anti-noise performance;therefore,it can reflect major damage accurately. The proposed method can essentially reveal the mathematic expression of stiffness damage,and can be applied in the damage identification of girder bridges.