CAJ | 학술논문

针对焊接过程复杂的边界条件及高度非线性，基于钢结构焊接残余应力的产生机理及特点，提出钢梁桥复杂结构构造焊接残余应力的简化模型和计算机模拟的基本流程。采用热－结构单向顺序耦合的方法先进行温度场分析，后将温度场计算结果作为预定义场进行加载求解应力场，实现钢梁桥焊接残余应力的计算机模拟。基于生死单元技术采用逐步激活焊缝单元模拟焊缝材料的逐步填充过程，采取生热率的方式模拟热源的移动加载，以模拟实际焊接中沿深度方向的焊接传热过程。以沪通长江大桥正交异性钢桥面板与U 肋焊接为例，采用有限元软件ANSYS分析焊接过程中的温度与应力响应，计算结果与理论规律吻合良好，验证了所提方法和基本流程的可行性。
침대한접과정복잡적변계조건급고도비선성，기우강결구한접잔여응력적산생궤리급특점，제출강량교복잡결구구조한접잔여응력적간화모형화계산궤모의적기본류정。채용열－결구단향순서우합적방법선진행온도장분석，후장온도장계산결과작위예정의장진행가재구해응력장，실현강량교한접잔여응력적계산궤모의。기우생사단원기술채용축보격활한봉단원모의한봉재료적축보전충과정，채취생열솔적방식모의열원적이동가재，이모의실제한접중연심도방향적한접전열과정。이호통장강대교정교이성강교면판여U 륵한접위례，채용유한원연건ANSYS분석한접과정중적온도여응력향응，계산결과여이론규률문합량호，험증료소제방법화기본류정적가행성。
In view of the complex boundary conditions and high non‐linear degree of the weld‐ing process and in compliance with the occurrence mechanism and characteristics of the welding re‐sidual stress in the steel structure ,the simplified model and the basic flow of computer simulation for the welding residual stress in the constructional details of the complex structure of the steel girder bridge were proposed .By the method of one‐way sequential coupling of thermo‐structure , the temperature fields were firstly analyzed and the calculation results of the temperature fields were then taken as the predefined fields and were used to load and solve the stress fields in order to realize the computer simulation of the welding residual stress in the steel girder bridge .Based on the element birth and death technique ,the process of gradual filling of the welding materials was simulated by gradually activating the weld seam elements and the moving loading of heat source was simulated by the heat generation rate method in order to simulate the process of welding heat transfer along the depth of the actual welding .By way of example of the welding of the orthotropic steel deck plate with the U ribs of the Hutong Changjiang River Bridge ,the finite element soft‐ware ANSYS was used to analyze the temperature and stress responses of the welding process and it was found that the calculation results were quite coincident with the theoretic law ,verifying that the proposed method and basic flow were feasible .