湖南大学学报（自然科学版）
湖南大學學報（自然科學版）
호남대학학보（자연과학판）
JOURNAL OF HUNAN UNIVERSITY(NATURAL SCIENCES EDITION)
2015年
5期
36-45
,共10页
周云%蒋运忠%易伟建%谢利民%贾凡丁
週雲%蔣運忠%易偉建%謝利民%賈凡丁
주운%장운충%역위건%사이민%가범정
多参考点脉冲锤击法%模态柔度%损伤识别%简支梁%组合结构
多參攷點脈遲錘擊法%模態柔度%損傷識彆%簡支樑%組閤結構
다삼고점맥충추격법%모태유도%손상식별%간지량%조합결구
multiple reference impact test%modal flexibility%damage identification%simply-supported beam%composite structures
利用多参考点脉冲锤击法的输入输出动力信号获取结构的模态柔度，可以对结构进行损伤识别，设计了一根钢筋混凝土简支梁和一块钢混凝土组合板的静动力试验。对不同损伤状态下的简支梁和组合板进行了动力测试，得到其模态柔度矩阵，并用来预测结构在荷载作用下的位移。简支梁试验结果表明，随着损伤程度的加深，结构自振频率降低，阻尼比增大，柔度增大，但自振频率只能判断结构损伤的出现，模态柔度则能够综合全面地反映钢筋混凝土简支梁结构的损伤位置和损伤程度。组合板试验表明，在线弹性状态下，动力测试与静力测试获得的模态柔度矩阵相差很小。设计了支座刚度变化、连接件损伤和横向支撑破坏这3种损伤工况，并用这3种工况来模拟实际桥梁结构可能出现的损伤状况。通过对比结构损伤前后的模态柔度位移信息，成功实现了组合板的损伤识别。
利用多參攷點脈遲錘擊法的輸入輸齣動力信號穫取結構的模態柔度，可以對結構進行損傷識彆，設計瞭一根鋼觔混凝土簡支樑和一塊鋼混凝土組閤闆的靜動力試驗。對不同損傷狀態下的簡支樑和組閤闆進行瞭動力測試，得到其模態柔度矩陣，併用來預測結構在荷載作用下的位移。簡支樑試驗結果錶明，隨著損傷程度的加深，結構自振頻率降低，阻尼比增大，柔度增大，但自振頻率隻能判斷結構損傷的齣現，模態柔度則能夠綜閤全麵地反映鋼觔混凝土簡支樑結構的損傷位置和損傷程度。組閤闆試驗錶明，在線彈性狀態下，動力測試與靜力測試穫得的模態柔度矩陣相差很小。設計瞭支座剛度變化、連接件損傷和橫嚮支撐破壞這3種損傷工況，併用這3種工況來模擬實際橋樑結構可能齣現的損傷狀況。通過對比結構損傷前後的模態柔度位移信息，成功實現瞭組閤闆的損傷識彆。
이용다삼고점맥충추격법적수입수출동력신호획취결구적모태유도，가이대결구진행손상식별，설계료일근강근혼응토간지량화일괴강혼응토조합판적정동력시험。대불동손상상태하적간지량화조합판진행료동력측시，득도기모태유도구진，병용래예측결구재하재작용하적위이。간지량시험결과표명，수착손상정도적가심，결구자진빈솔강저，조니비증대，유도증대，단자진빈솔지능판단결구손상적출현，모태유도칙능구종합전면지반영강근혼응토간지량결구적손상위치화손상정도。조합판시험표명，재선탄성상태하，동력측시여정력측시획득적모태유도구진상차흔소。설계료지좌강도변화、련접건손상화횡향지탱파배저3충손상공황，병용저3충공황래모의실제교량결구가능출현적손상상황。통과대비결구손상전후적모태유도위이신식，성공실현료조합판적손상식별。
The utilization of the input and output dynamic signals from multiple reference hammer im-pact method (MRIT)for modal flexibility extraction and structural damage identification was studied. Static and dynamic experiments on a Reinforced Concrete (RC)simply supported beam and a steel-concrete composite bridge deck were designed.MRIT was conducted on the simply supported beam and composite plate under different damage states,and modal flexibility was obtained in the test,which can be used to predict the displacement under applied loading.The beam test results demonstrated that the natural fre-quency decreased while the damping ratio and flexibility increased with the development of damage.Chan-ges of natural frequency can only determine the existence of structural damage,while the changes of modal flexibility can indicate the damage location and damage degree of RC beam.Steel-concrete composite slab test results demonstrated that the differences between dynamic flexibility and static flexibility match well under the linear elastic state.Three damage cases were designed to simulate the damage situation on real bridges,which are the removal of cross diaphragm,changes of boundary condition and damage of connec-tors.By comparing modal flexibility information before and after structural damage,the damage of steel-concrete composite slab was achieved.
