鋼箱計(jì)算失效應(yīng)變的沖擊試驗(yàn)

王君杰+李軍+孟德巍

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

收稿日期：20131107

基金項(xiàng)目：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（“九七三”計(jì)劃）項(xiàng)目（2013CB036305）；國家自然科學(xué)基金項(xiàng)目（51278373）；

交通運(yùn)輸部西部交通建設(shè)科技項(xiàng)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(dǎo)師，工學(xué)博士，

摘要：為研究船橋碰撞有限元分析中鋼板的網(wǎng)格尺寸與鋼材計(jì)算失效應(yīng)變之間的關(guān)系，進(jìn)行了3個(gè)鋼箱模型的落錘沖擊試驗(yàn)。采用LSDYNA軟件對試驗(yàn)?zāi)Ｐ瓦M(jìn)行了有限元建模和碰撞計(jì)算，并與試驗(yàn)結(jié)果進(jìn)行了對比。定義了一個(gè)相關(guān)系數(shù)來反映試驗(yàn)結(jié)果與計(jì)算結(jié)果之間的相關(guān)性，并據(jù)此定義了與網(wǎng)格尺寸相關(guān)的計(jì)算失效應(yīng)變合理取值區(qū)間。研究結(jié)果表明：為得到合理精度的計(jì)算結(jié)果，鋼板的計(jì)算失效應(yīng)變的取值應(yīng)隨鋼板網(wǎng)格尺寸變化，使用大的網(wǎng)格尺寸時(shí)應(yīng)采用小的失效應(yīng)變，使用小的網(wǎng)格尺寸時(shí)應(yīng)采用大的失效應(yīng)變；將計(jì)算失效應(yīng)變合理取值區(qū)間與自適應(yīng)網(wǎng)格剖分技術(shù)結(jié)合，可以在保證計(jì)算精度的同時(shí)，提高計(jì)算效率。

關(guān)鍵詞：鋼箱；網(wǎng)格尺寸；失效應(yīng)變；計(jì)算精度；自適應(yīng)網(wǎng)格剖分；沖擊試驗(yàn)

中圖分類號：U661.72文獻(xiàn)標(biāo)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(shè)計(jì)，能夠把握船撞橋的碰撞力特征和破壞形態(tài)具有重要的實(shí)際意義。隨著計(jì)算機(jī)技術(shù)的快速發(fā)展，特別是有限元技術(shù)的日益進(jìn)步和成熟，數(shù)值模擬分析在橋梁船撞設(shè)計(jì)和防撞設(shè)施設(shè)計(jì)上逐漸得到了廣泛的應(yīng)用。與此同時(shí)，數(shù)值仿真計(jì)算結(jié)果的可靠性和如何使用有限元技術(shù)對此類碰撞問題進(jìn)行有效的模擬日益成為關(guān)注的焦點(diǎn)。……