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针对当前分步建模法存在的刚度矩阵修正和新增结构定位等问题,提出了将每个施工阶段分为初始时刻和结束时刻进行分析的方法.在此基础上,提出了钢结构施工过程分析中结构刚度矩阵修正的新方法.同时,针对新增构件定位及结构位形定位问题,提出了修正设计位形定位法.最后,对现有分步建模法的实现方法进行了改进.基于Matlab软件平台,编制了改进分步建模法的计算模块,模拟分析2层刚架结构的施工过程,并与状态变量叠加法、生死单元法、一步成型法进行对比.结果表明,本文的刚度矩阵修正方法及修正设计位形方法正确、有效、计算精度高.
Aiming at the problems of the current step-by-step modeling method, such as the stiffness matrix correction and the new structure positioning, this paper puts forward a method of analyzing each construction phase into initial time and ending time, and on this basis, puts forward the steel structure construction process In the meantime, aiming at the problems of new component positioning and structure positioning, a modified positioning method is proposed.Finally, the existing method of step modeling is improved. Based on the Matlab software platform, the calculation module for improving the step-by-step modeling method is compiled and the construction process of the two-story frame structure is simulated and compared with the state variable superposition method, the life and death unit method and the one-step forming method.The results show that, Stiffness matrix correction method and correct design bitmap method is correct, effective, high accuracy.