结构工程师
結構工程師
결구공정사
Structural Engineers
2015年
4期
85-91
,共7页
综合吊挂体系%关键构件%连续倒塌%有限元分析%侧向约束
綜閤弔掛體繫%關鍵構件%連續倒塌%有限元分析%側嚮約束
종합조괘체계%관건구건%련속도탑%유한원분석%측향약속
composite suspension structure%key structural members%progressive collapse%finite element analysis%lateral restraint
综合吊挂体系构件破坏可能引起体系发生连续性倒塌，采用有限元分析综合吊挂体系单根吊杆及吊杆群组失效后剩余结构的应力及应变特性，判断构件破坏及确定倒塌范围。结果表明单根吊杆破坏会引起相邻吊杆及桥架破坏，吊杆群组破坏会引发局部吊挂体系倒塌。通过在关键部位设置冗余约束可以提高体系的鲁棒性。采用具有良好抗震性能的斜拉杆侧向约束构件，竖向吊杆失效后水平支撑通过斜拉杆与两侧主钢梁形成新的有效传力体系，单根吊杆及吊杆群组发生破坏后均不会向周边扩展。采用紧邻双斜拉杆体系进行综合吊挂体系分区，可控制综合吊挂体系子区域面积满足抗连续倒塌范围。
綜閤弔掛體繫構件破壞可能引起體繫髮生連續性倒塌，採用有限元分析綜閤弔掛體繫單根弔桿及弔桿群組失效後剩餘結構的應力及應變特性，判斷構件破壞及確定倒塌範圍。結果錶明單根弔桿破壞會引起相鄰弔桿及橋架破壞，弔桿群組破壞會引髮跼部弔掛體繫倒塌。通過在關鍵部位設置冗餘約束可以提高體繫的魯棒性。採用具有良好抗震性能的斜拉桿側嚮約束構件，豎嚮弔桿失效後水平支撐通過斜拉桿與兩側主鋼樑形成新的有效傳力體繫，單根弔桿及弔桿群組髮生破壞後均不會嚮週邊擴展。採用緊鄰雙斜拉桿體繫進行綜閤弔掛體繫分區，可控製綜閤弔掛體繫子區域麵積滿足抗連續倒塌範圍。
종합조괘체계구건파배가능인기체계발생련속성도탑，채용유한원분석종합조괘체계단근조간급조간군조실효후잉여결구적응력급응변특성，판단구건파배급학정도탑범위。결과표명단근조간파배회인기상린조간급교가파배，조간군조파배회인발국부조괘체계도탑。통과재관건부위설치용여약속가이제고체계적로봉성。채용구유량호항진성능적사랍간측향약속구건，수향조간실효후수평지탱통과사랍간여량측주강량형성신적유효전력체계，단근조간급조간군조발생파배후균불회향주변확전。채용긴린쌍사랍간체계진행종합조괘체계분구，가공제종합조괘체계자구역면적만족항련속도탑범위。
Progressive collapse may be initiated by failure of the member of the composite suspension system. Using finite element software,we analysis the stress and strain distribution of the residual composite suspension structure after the damage of the single suspender or suspender group.Based on the stress and strain distribution,it is possible to determine damage of the members and confirm the scope of collapse.The simulation results show that the failure of the adjacent members or the bridge leads to the collapse of the suspension structure.The structure robustness can be improved by adding redundant at the key position.The failure not spread after the damage of the single suspender or suspender group if the new load transfer path is formed through effective diagonal member with both sides of the main beam and horizontal structure members which have good seismic performance.
