CAJ | 학술논문

为研究加劲肋与横隔板开孔焊接关键构造部位的热点应力建模计算方法，基于热点应力计算理论，以甬江特大铁路斜拉桥为背景，应用ANSYS有限元软件，采用4种单元（Solid45、Solid95、Shell63、Shell93）及3种网格精度（1，3，5mm）建立有限元模型，利用4种外推方法（IIW线性法、ABS／DNV线性法、IIW二次法以及Dong氏法）进行热点应力计算，并结合疲劳试验分析外推方法及模型单元对计算结果的影响。结果表明：单元类型、网格精度以及应力外推方法对热点应力计算值影响较大；在距焊趾0．4t（t为板厚）范围内，热点应力计算值受网格划分精度的影响较大，而在距焊趾0．4t～2．0t范围内得到较好的收敛；推荐采用Solid95单元进行建模，采用IIW线性外推法进行热点应力计算。
위연구가경륵여횡격판개공한접관건구조부위적열점응력건모계산방법，기우열점응력계산이론，이용강특대철로사랍교위배경，응용ANSYS유한원연건，채용4충단원（Solid45、Solid95、Shell63、Shell93）급3충망격정도（1，3，5mm）건립유한원모형，이용4충외추방법（IIW선성법、ABS／DNV선성법、IIW이차법이급Dong씨법）진행열점응력계산，병결합피로시험분석외추방법급모형단원대계산결과적영향。결과표명：단원류형、망격정도이급응력외추방법대열점응력계산치영향교대；재거한지0．4t（t위판후）범위내，열점응력계산치수망격화분정도적영향교대，이재거한지0．4t～2．0t범위내득도교호적수렴；추천채용Solid95단원진행건모，채용IIW선성외추법진행열점응력계산。
To study the modeling and calculation methods for the hot spot stress of the criti‐cal structural parts of the stiffening ribs welded to the openings in diaphragm ,the Yongjiang Riv‐er Railway Cable‐Stayed Bridge was employed as a case study .Based on the hot spot stress calcu‐lation theory and by means of the software ANSYS ,4 types of the elements (the Solid45 ,Sol‐id95 ,Shell63 ,Shell93) and 3 types of the grid accuracy (1 ,3 ,5 mm) were used to set up the fi‐nite element models ,the hot spot stress was calculated by the 4 types of stress extrapolation methods (the IIW linearity method , ABS/DNV linearity method , IIW quadratic method and Dong method) and also with reference to the fatigue tests ,the influences of the extrapolation methods and model elements on the calculation results were analyzed .The results of the analysis demonstrate that the types of the elements ,grid accuracy and extrapolation methods have consid‐erable influences on the calculated values of the hot spot stress .In the ranges of 0 .4 t (t denotes the plate thickness) from the welded toes ,the calculated values of the hot spot stress are affected considerably by the grid accuracy while in the ranges of 0 .4 t~2 .0 t ,better convergence can be a‐chieved and it is therefore recommended that the element of the Solid95 should be used to set up the models and the hot spot stress should be calculated by the IIW linearity method .