基于极限状态法的岸桥结构抗震可靠性分析
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摘要
针对集装箱码头岸边装卸桥(简称岸桥)在地震作用下的安全可靠性问题,对岸桥在极限状态下的抗震可靠性开展了研究。通过对地震参数与材料力学性能的随机性描述,获得了地震作用下各随机变量的概率分布规律和统计参数;采用有限元软件ANSYS建立了岸桥结构的力学模型,用时间历程法对地震作用下岸桥承载能力进行了计算;根据可靠性理论建立了地震作用下岸桥的可靠度计算模型,用Monte-Carlo法计算了岸桥在极限状态下的抗震可靠度。结果表明在8级烈度地震作用下,岸桥结构整体上比较安全,但门框横梁与陆侧立柱的连接处的可靠度指标比较低,存在失效可能性;与许用应力法相比,极限状态法更具合理性。
Aiming at solving the safety reliability problem of quayside container crane under earthquake action,the anti-seismic reliability analysis under limit state was put forward.The distribution and statistical parameters of random variables were clarified by means of random description of earthquake parameters and mechanical properties.The mechanical model of quayside container crane was founded by adopting FEM software ANSYS.In virtue of the time-history analysis,the calculation of limit state bearing force was completed.The anti-seismic reliability was analysed by use of Monte-Carlo method.The results show that the overall structure is relatively stable,but the reliability indices of the frame side beams and the land column junction are relatively low and thus the failure possibility exists.Compared to the permissible stress design method,the limit state method is more reasonable.
Aiming at solving the safety reliability problem of quayside container crane under earthquake action,the anti-seismic reliability analysis under limit state was put forward.The distribution and statistical parameters of random variables were clarified by means of random description of earthquake parameters and mechanical properties.The mechanical model of quayside container crane was founded by adopting FEM software ANSYS.In virtue of the time-history analysis,the calculation of limit state bearing force was completed.The anti-seismic reliability was analysed by use of Monte-Carlo method.The results show that the overall structure is relatively stable,but the reliability indices of the frame side beams and the land column junction are relatively low and thus the failure possibility exists.Compared to the permissible stress design method,the limit state method is more reasonable.
引文
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[2]高小旺,鲍霭斌.地震作用的概率模型及其统计参数[J].地震工程与工程振动,1985,5(1):13-22.
[3]欧进萍,段宇博,刘会仪.结构随机地震作用及其统计参数[J].哈尔滨建筑工程学院学报,1994,27(5):1-10.
[4]Algermissen S T,David M P.A probability estimate of maxi-mum acceleration in rock in the continuous united states[R].USGS Open-File Report 76-416.
[5]程磊.钢筋混凝土框架结构基于ANSYS的抗震可靠性设计——理论与方法[D].武汉:武汉理工大学,2007.
[6]吴映栋.地震作用下剪切型结构时程分析与可靠性[D].浙江:浙江大学,2004.
[7]Sayan Gupta,Manohar C S.Reliability analysis of randomlyvibrating structures with parameter uncertainties[J].Journal ofSound and Vibration,2006,297:1000-1024.
[8]吕大刚,李晓鹏,胡晓琦,等.钢框架结构的非线性静力抗震可靠性分析Ⅱ:可靠度指标及其灵敏度[J].地震工程与工程振动,2008,28(1):71-78.
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