张超1,2,付馨迪1,许莉1,颜学渊1 ,贾宏宇3.拉索失效对多重四边环索-张弦穹顶的影响[J].湖南大学学报:自然科学版,2020,(1):83~92
拉索失效对多重四边环索-张弦穹顶的影响
Influence of Multiple Square Loops-string Dome Subjected to Cable Failure
  
DOI:
中文关键词:  多重环索  张弦梁  穹顶  拉索失效  极限承载能力
英文关键词:multiple square loops  beam string  domes  cable failure  ultimate bearing capacity
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作者单位
张超1,2,付馨迪1,许莉1,颜学渊1 ,贾宏宇3 (1. 福州大学 土木工程学院福建 福州 350108 2. 城市与工程安全减灾省部共建教育部重点实验室(北京工业大学)北京 100124 3. 西南交通大学 土木工程学院四川 成都 610031) 
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中文摘要:
      多重四边环索-张弦穹顶结构作为一种新型的索支穹顶结构,拉索失效会对屋盖结构受力产生较大影响. 以全国首座三重四边环索-张弦穹顶屋盖(福州海峡奥林匹克中心体育馆屋盖)为研究背景,研究了拉索失效对于此类新型索支穹顶结构的竖向刚度、构件内力及极限承载能力的影响规律,并评估单根拉索失效后屋盖结构的安全性. 分析结果表明:拉索失效均会引起屋盖显著下挠,各种工况中外环索失效会引起最大的屋盖下挠,但是,不同拉索失效后屋盖竖向变形分布规律相差较大;外环索和张弦索的失效会引起相邻拉索索力不同程度地增大;外环索与张弦索的相互影响大于各环索之间的相互影响;不同位置的拉索失效均会引起屋盖极限承载能力下降,外环索失效引起结构极限承载力下降最显著;“仅单侧张弦索失效”会引起较“两侧张弦索均失效”更不利的屋盖挠度和极限承载力. 总之,外环索失效为最不利拉索失效工况,会引起屋盖最大挠度增大134%,张弦索索力增加11.7%,极限承载力减小35%. 但是,剩余整体屋盖结构仍具有一定的安全性.
英文摘要:
      Multiple square loops-string dome is a newly suspen-dome structure,and cable failure shows significant effect on multiple square loops-string dome structures. This paper used the Fuzhou Strait Olympic Center Gymnasium as the research background to study the effect of cable on the vertical stiffness of the roof,the internal forces of the roof and the ultimate bearing capacity,and safety capability evaluation of the cable failure roof was carried out. The analysis results show that the vertical deformation of the roof can be reduced after cable failure. Among them,the failure of the outer loop cable causes the maximum vertical deformation. However,various vertical deformation distributions subjected to different cable failure are generated. The failure of either the outer loop or string cable can increase the tension force of the adjacent cable significantly. The interaction between the outer loop cable and string cable is greater than the mutual influence between the other loop cables; Ultimate bearing capacity of the roof can be reduced when cable failure occurs,which reaches the minimum value when the outer loop cable fails. It should be noted that “Only one side string cable failure” causes more serious deflection and less ultimate bearing capacity when compared with“two side string cable failure”. In all,failure of the outer loop cable is the most serious case,which causes that vertical deflection increases by 134%,the cable tension force of adjacent cable increases by 11.7%,and the ultimate bearing capacity reduces by 35%. However,the residual roof structure is still in a safe state.
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