实现初始静载影响的大跨组合网架ANSYS弹塑性时程分析
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摘要
为了准确反应大跨组合网架在结构地震作用下的真实状态,必须考虑初始静载影响下的网架时程分析。该文利用瞬态分析的瞬态控制选项TIMINT用于指定是否考虑时间积分效应及其他关键性设置和连续多载荷步求解法,编制APDL语言实现了弹塑性时程分析时考虑初始静载的影响,并通过大跨组合网架算例进行了对比分析。结果表明:未考虑初始静载影响的地震时程分析得到的网架位移、内力值、支承柱竖向内力值严重偏小,与事实不符;把未考虑初始静载影响的分析结果按照叠加原理与静力分析结果相加,与考虑初始静载影响时分析进行相比,对已进入塑性阶段的杆件,位移、内力值有很大差异。该文研究实现了大跨组合网架弹塑性时程分析时考虑初始静载的影响,反映了结构地震作用下的真实状态。
In order to reflect the true state under seism about the long-span composite truss frame,the analysis should embody the initial influence of static loads.In the transient dynamic analysis,the option TIMINT is set to designate whether the effects of time integration and some key settings and the consecutive multi-load step solution should be embodied.The APDL language is utilized to realize the initial inflence of static loads in the elastic-plastic time-history analysis,and the comparison and analysis are made through the calculation examples.The results show that for the composite truss frame in the elastic-plastic time-history analysis,whether the initial conditions are considered will have great influence on the analysis results.
In order to reflect the true state under seism about the long-span composite truss frame,the analysis should embody the initial influence of static loads.In the transient dynamic analysis,the option TIMINT is set to designate whether the effects of time integration and some key settings and the consecutive multi-load step solution should be embodied.The APDL language is utilized to realize the initial inflence of static loads in the elastic-plastic time-history analysis,and the comparison and analysis are made through the calculation examples.The results show that for the composite truss frame in the elastic-plastic time-history analysis,whether the initial conditions are considered will have great influence on the analysis results.
引文
[1]薛素铎,赵均,高向宇.建筑抗震设计(第二版)[M].北京:科学出版社,2005:80,85-86.
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[3]陈爱军,吴美茹,南丽萍.基于ANSYS的平面不规则结构地震响应分析[J].水利与建筑工程学报,2008,6(2):25-27.
[4]江见鲸,陆新征,叶列平.混凝土结构有限元分析[M].北京:清华大学出版社,2005:47-48.
[5]Anil K.Chopra著.结构动力学理论及其在地震工程中的应用[M].谢礼立,吕大刚,译.北京:高等教育出版社,2007:341.
[6]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005:69.
[2]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007:81-83.
[3]陈爱军,吴美茹,南丽萍.基于ANSYS的平面不规则结构地震响应分析[J].水利与建筑工程学报,2008,6(2):25-27.
[4]江见鲸,陆新征,叶列平.混凝土结构有限元分析[M].北京:清华大学出版社,2005:47-48.
[5]Anil K.Chopra著.结构动力学理论及其在地震工程中的应用[M].谢礼立,吕大刚,译.北京:高等教育出版社,2007:341.
[6]曹资,薛素铎.空间结构抗震理论与设计[M].北京:科学出版社,2005:69.
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