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大跨度拱形立体桁架结构在强震下发生的失效模式有动力失稳破坏和动力强度破坏.依据已有的B-R动力失稳判定准则和评定网壳结构动力强度破坏行为的方法,研究结构在强震作用下进入塑性杆件数目及比例,以及结构最大位移变化规律.研究表明,如果超过某一荷载时,结构进入塑性的杆件比例显著增长,则该荷载即被认为是拱形立体桁架结构的动力强度破坏临界荷载.以某拱形立体桁架为背景,选取三向El-Centro波和三向天津波作为地震输入进行弹塑性时程分析,进一步验证本文的结论,通过分析可以得出该拱形桁架在强震作用下发生动力失稳破坏.
The failure modes of long-span arch truss structures under dynamic earthquakes include dynamic instability damage and dynamic strength failure.According to the existing BR dynamic instability criterion and the method of evaluating the dynamic strength failure of the reticulated shell structure, The number and proportion of plastic bars entering under the action of strong earthquakes and the rule of maximum displacement of the structure show that if a certain load is applied, the ratio of the structure to the plastic bar increases significantly, then the load is considered as an arch truss The dynamic strength of the structure undermines the critical load. Based on an arched truss, three-way El-Centro waves and three-direction Tianjin waves are selected as seismic inputs for elastoplastic time-history analysis. The conclusions of this paper are further validated by analysis The arch truss under the action of strong earthquake dynamic instability damage.