【摘要】：采用階段臨界強度分枝-約界法對一座斜拉橋模型進行了主要失效模式的搜索,分析了拉索抗力衰減及拉索破斷情形下系統(tǒng)主要失效模式和系統(tǒng)可靠度的變化情況.結果表明:未出現(xiàn)斷索情形時,結構系統(tǒng)主要失效模式間的相關性很高,但在有拉索破斷后,主要失效模式間的相關性出現(xiàn)了明顯分組特征;系統(tǒng)可靠度指標隨著拉索抗力的衰減而逐漸降低,考慮拉索破斷時,外索破斷后剩余結構系統(tǒng)可靠度指標降低較多,得到了破斷后對剩余結構系統(tǒng)可靠度影響最大的拉索位置,可為斜拉橋結構設計提供參考.
[Abstract]:The main failure modes of a cable-stayed bridge model are searched by using the method of critical strength branch-reduction bound, and the main failure modes and system reliability changes under the condition of cable resistance attenuation and cable breaking are analyzed. The results show that the correlation between the main failure modes of the structural system is very high when there is no cable break, but the correlation between the main failure modes appears obvious grouping characteristics after the cable break. The reliability index of the system decreases gradually with the attenuation of the cable resistance. When the cable is broken, the reliability index of the residual structure system after the breakage of the external cable decreases more, and the position of the cable which has the greatest influence on the reliability of the residual structure system after the breakage is obtained. It can provide reference for the structural design of cable-stayed bridge.
【作者單位】： 湖南大學土木工程學院;
【基金】：國家自然科學基金資助項目(51578227)~~
【分類號】：U448.27

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本文編號：2260461