【作者】 陈志立；

【导师】 魏文晖；

【作者基本信息】 武汉理工大学 ， 结构工程， 2005， 硕士

【摘要】 为避免在预应力梁分析中由于参数改变而重复编写ANSYS命令流,本文尝试运用C++编写对话框式预应力梁ANSYS命令流自动生成系统,以减少工程分析人员的编程工作量。通过运行本程序,并与权威SAP2000软件提供的理论数据对比,其结果吻合较好,表明本程序是工程人员有效的辅助分析工具。 同时,用有限元程序分析粘帖预应力CFRP混凝土结构,比较了梁的荷载—应变图;梁中荷载—变形图;开裂荷载;屈服荷载;破坏荷载;用有限元程序对加固前后的框架结构进行动力分析。建立框架结构有限元模型,对有限元程序进行动力分析的方法进行比较后选择模态迭加法对地震作用下的框架进行有限元计算,最后对动力计算结果进行分析,结果表明框架梁粘贴预应力CFRP加固后,框架动力性能基本不变,梁的受力情况有较大改善。然后分析环向预应力CFRP的主动约束对框架结构柱加固后较非预应力CFRP的被动约束对框架结构柱的延性和强度都有提高(其中强度提高是由于预应力使CFRP的强度得到更充分的运用),然后分析在地震作用下,框架顶层位移较非预应力CFRP对框架结构柱加固有所减少,提高了框架结构的抗侧移能力,所以环向预应力CFRP加固框架结构柱通过约束塑性铰区的混凝土较非预应力CFRP对框架结构加固优越,CFRP的强度也能得到更好发挥,延性系数可提高6%～12%。因此适当运用预应力技术可以得到更好的加固效果。更多还原

【Abstract】 In order to avoid repetitively compiling ANSYS order lines of prestressed beam analysis for the parameter changes, this text tries to make use of the C++ to compile the dialog box system of the ANSYS order lines autogeneration system of prestressed beam. This text gets the example’s result through running this procedure. Comparing the result with the academic data of authoritative SAP2000 software, we find that the data fits together well. This procedure is engineers’ effectively analysis tool.At the same time, finite element method models are developed to simulate the behavior of R.C. structures strengthened with externally bonded prestressed-CFRP sheets. Comparisons are made for load-strain plots at selected locations on the beams; load-deflection plots at midspan; first cracking loads; loads at failure; and crack patterns at failure. Modeling simplifications and assumptions developed during this analysis are presented. The study compared strains from the FEM analysis with measured strains from load tests. Conclusions from the current research efforts and recommendations for future studies are included.Analysis of R.C. frame strengthened with prestressed-CFRP and non-prestressed-CFRP subjected to minute earthquake and disastrous earthquake with FEM are presented. After modal analysis, the natural frequencies and mode shapes of R.C. frame are obtained. Then the dynamical responses of R.C. frame are studied with transient analysis. The study compared responses of R.C. frame with that of R.C. frame strengthened with prestressed-CFRP and non-prestressed-CFRP . The results indicate that strengthening R.C. frame with prestressed-CFRP can effectively reduce the seismic responses.更多还原