球面网壳结构在强震下的失效机理_沈世钊.pdfVIP

　38 1 　　　　　 Vol.38　No.1 　　　 　2 0 0 5 1 CHINA CIVIL ENGINEERING JOURNAL Jan.　2005 沈世钊　支旭东 () :: 。 。 , , 。 , 。 :;;;;; :TU393.3　　　　　:A :1000-131X (2005)01-0011-10 FAILURE MECHANISM OF RETICULAR SHELLS SUBJECTED TO DYNAMIC ACTIONS Shen Shizhao 　Zhi X udong (school of Civil Engineering, Harbin Institute of Technology) Abstract:T o kindsof failure mechanisms of reticular shells subjected to dynamic actions , dynamic instability mainly due to the second-order effect of shell structures, and the strength failure mainly due to excessive development of plastic deforma- tions, are studied in a unified theoreticalframe based upon non-linear dynamic response analysis.The criteria for discrimina- tion of strength failure, as ell as of dynamic instability of reticular shells, are proposed for practical applications.Case ex- amples of single-layer reticular domes subjected to harmonic actions ith different frequencies, as ell as to different earth- quake motions, are thoroughly analyzed, the failure mechanism is discussed, and the corresponding ultimate loads are ob- tained, thus, the effectiveness of the suggested theoretical procedure is verified. Keywords:reticular shell;harmonic action;earthquake action;failure mechanism;dynamic instability;strength failure , 1　: 。: (), , , 。 , ( , , ), , ; ; 。 [1, 2] 。 [3] : , , , , , ()。 , 。 。 ()、