福建建设科技
福建建設科技
복건건설과기
Fujian Construction Science & Technology
2015年
5期
18-21
,共4页
中%下承式拱桥%吊杆破断%剩余结构%易损性
中%下承式拱橋%弔桿破斷%剩餘結構%易損性
중%하승식공교%조간파단%잉여결구%역손성
half-through and through arch bridges%cable fracture%residual structure%vulnerability%dynamic amplification coefficient
以一座中承式和一座下承式钢管混凝土拱桥为工程背景，利用ANSYS瞬态分析功能和单元生死技术分析对断索作用下悬吊桥面系的动力响应进行了研究，并对吊杆破断剩余结构敏感性和易损性进行分析。分析结果表明，加劲纵梁对吊杆破断敏感性指标最高，易损性指标最大，且吊杆破断后加劲纵梁达到最大响应的历时时间最短，属于断索作用下最可能先产生破坏的构件；当吊杆发生锈蚀疲劳等损伤后，剩余吊杆可能先于加劲纵梁发生破坏，而导致连续断索的发生。
以一座中承式和一座下承式鋼管混凝土拱橋為工程揹景，利用ANSYS瞬態分析功能和單元生死技術分析對斷索作用下懸弔橋麵繫的動力響應進行瞭研究，併對弔桿破斷剩餘結構敏感性和易損性進行分析。分析結果錶明，加勁縱樑對弔桿破斷敏感性指標最高，易損性指標最大，且弔桿破斷後加勁縱樑達到最大響應的歷時時間最短，屬于斷索作用下最可能先產生破壞的構件；噹弔桿髮生鏽蝕疲勞等損傷後，剩餘弔桿可能先于加勁縱樑髮生破壞，而導緻連續斷索的髮生。
이일좌중승식화일좌하승식강관혼응토공교위공정배경，이용ANSYS순태분석공능화단원생사기술분석대단색작용하현조교면계적동력향응진행료연구，병대조간파단잉여결구민감성화역손성진행분석。분석결과표명，가경종량대조간파단민감성지표최고，역손성지표최대，차조간파단후가경종량체도최대향응적력시시간최단，속우단색작용하최가능선산생파배적구건；당조간발생수식피로등손상후，잉여조간가능선우가경종량발생파배，이도치련속단색적발생。
Based on the engineering of a half through bridge and a through arch bridge, the dynamic response of the bridge deck structures after cables fracture was studied by using ANSYS transient analysis function and cell death technology.And the sensitivity and vulnerability of the residual structure was analyzed.The results show, compared to arch and the remaining cables, stiffening girder is the most possible damage component after cable fracture for its highest sensitivity, biggest vulnerability and shortest time to achieve maximum response. When corrosion fatigue damage occurred, the remaining cables destroy may occur first, and then continuous bridge collapse occurred.
