鋼箱計算失效應變的沖擊試驗

王君杰+李軍+孟德巍

建筑科學與工程學報2014年文章編號：16732049(2014)01005006

收稿日期：20131107

基金項目：國家重點基礎研究發展計劃（“九七三”計劃）項目（2013CB036305）；國家自然科學基金項目（51278373）；

交通運輸部西部交通建設科技項目（2007 318 822 34）

作者簡介：王君杰（1962），男，遼寧本溪人，教授，博士研究生導師，工學博士，

摘要：為研究船橋碰撞有限元分析中鋼板的網格尺寸與鋼材計算失效應變之間的關系，進行了3個鋼箱模型的落錘沖擊試驗。采用LSDYNA軟件對試驗模型進行了有限元建模和碰撞計算，并與試驗結果進行了對比。定義了一個相關系數來反映試驗結果與計算結果之間的相關性，并據此定義了與網格尺寸相關的計算失效應變合理取值區間。研究結果表明：為得到合理精度的計算結果，鋼板的計算失效應變的取值應隨鋼板網格尺寸變化，使用大的網格尺寸時應采用小的失效應變，使用小的網格尺寸時應采用大的失效應變；將計算失效應變合理取值區間與自適應網格剖分技術結合，可以在保證計算精度的同時，提高計算效率。

關鍵詞：鋼箱；網格尺寸；失效應變；計算精度；自適應網格剖分；沖擊試驗

中圖分類號：U661.72文獻標志碼：A

Impact Test on Computational Failure Strain of Steel BoxesWANG Junjie, LI Jun, MENG Dewei

（State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China）Abstract: In order to investigate the relations between the meshing size of steel plates and computational failure strain of steel in shipbridge collision finite element analysis, the drop hammer impact tests of three steel boxes were carried out. The finite element model was built and impact computation was conducted for test models using LSDYNA software, and the computational results were compared with the test results. A correlation coefficient was defined to obtain a reasonable failure strain interval related to the meshing size of the steel boxes. The research results show that in order to get reasonable computational accurcy, the values of computational failure strainshould vary with the meshing size of steel plates. The larger failure strain should be used for the smaller meshing size, and the smaller failure strain should be used for the larger meshing size. The computational accuracy and computational efficiency can be obtained at the same time through combining the reasonable computational failure strain interval and the adaptive meshing technology.

Key words: steel box; meshing size; failure strain; computational accuracy; adaptive meshing; impact test

0引言

對于橋梁船撞設計，能夠把握船撞橋的碰撞力特征和破壞形態具有重要的實際意義。隨著計算機技術的快速發展，特別是有限元技術的日益進步和成熟，數值模擬分析在橋梁船撞設計和防撞設施設計上逐漸得到了廣泛的應用。與此同時，數值仿真計算結果的可靠性和如何使用有限元技術對此類碰撞問題進行有效的模擬日益成為關注的焦點。……