- 摘 要
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羅永峰 鄭 科 董 潔
（同濟大學建工系 上海 200092）[提要] 現(xiàn)行網(wǎng)架規(guī)程中的焊接空心球承載力設計公式是以試驗為基礎的經(jīng)驗公式，對以穩(wěn)定性控制的球殼，難以求得較為精確的屈曲臨界點。應用對稱旋轉(zhuǎn)薄殼屈曲的非線性有限元理論，對空心球節(jié)點進行大位移彈塑性屈曲分析，得出了可供設計參考的空心球承載力數(shù)據(jù)表，并回歸出適用于大直徑空心球計算的近似公式，以確定空心球節(jié)點的失效狀態(tài)及臨界荷載。
[關鍵詞] 空心球節(jié)點 臨界荷載 非線性有限元The design formulae of load-bearing capacity of spherical thin-shell joints in the spatial trusses code are empirical, which are based on limited tests. These formulae are hard to be used to determine the exactly critical loads for compressive shell joints. The nonlinear finite element theory of shells of revolution is applied to analyze the large-deflection and elasto-plastic behavior of the large hollow spherical shell joints.A series of joints that are often used in engineering are calculated and compared. The numerical results are listed in several tables and a new design formula is presented
for future engineering reference.
Keywords: spherical thin-shell joint; critical load; nonlinear FEM
