The seism response analysis of aqueduct bridge is analyzed with modal superposition method based on response spectrum which participant mode of vibration chooses the former 1 0 steps and combinatorial method was srss 渡槽的地震反应分析采用振型分解反应谱法,参与振型取前10阶,组合方法用srss法,求得结构的地震作用效应。
Basing on the feature of the structure member , the structure is simplified to a 3 - d model consist of space beams and plates , so we can make static and response spectrum dynamic analysis on the finite - element models 根据该结构各构件的受力特征,将整个结构模拟为空间梁、板单元的三维整体计算模型,并对有限元分析模型进行静力和反应谱法的动力分析。
When the structural seismic responses of suspension - mass pendulums were analyzed with response spectrum method , the vibration modal numbers considered were to be structural first vibration modal and previous vibration modals of structural vibration as well 用反应谱法对悬吊结构进行地震反应分析时,所考虑的振型数应为结构的第一振型和相应于结构振动的前几个振型。
Compared with the results of time history analysis , response spectrum theory overestimates the action of earthquake , so that the time history analysis should be adopted besides the response spectrum theory in calculating suspended structure 与时程分析法的结果比较,表明反应谱法高估了地震作用。因此,对悬挂建筑结构除采用反应谱法分析外,应采用时程分析法补充计算。
The vibration shapes - separation - spectra - method and time - history method are used to analyze the dynamic response of the cable - bar structure under common earthquake . and the effects of the rise - to - span ratio and the mass distribution are studied 本文分别采用反应谱法和时间历程法对环状索杆结构的地震响应作了较详细的分析,研究了矢跨比、质量分布对环状索杆结构地震响应的影响。
The third , according to code for seismic design of buildings ( gb50011 - 2001 ) , the analysis of r . c . frame structure with special - shaped column is conducted under minor levels of ground motion by means of model analysis method and elastic time - history analysis method 第三,按照抗震规范( gb50011 - 2001 )的相关规定,用振型分解反应谱法和弹性动力时程分析法,对钢筋混凝土异形柱框架结构进行了多遇地震下的计算分析。
The classical frequency - domain theory forms a basis of bridge vibration analysis , however such method has some limitations . some literatures show that the time - domain analysis method has advantages for vibration analysis . because of the research on time - domain vibration analysis developed only in recent years and the theory is n ' t perfect enough , it needs to be made further investigation 经典的简化静力法存在一定的局限性;反应谱法为中、小跨桥梁的抗震设计提供了广泛的应用,但对解决大跨度桥梁的线性与非线性问题存在明显不足;时程分析法由于该领域的研究起步较晚,目前的理论和方法还不甚成熟,有待于进一步深入研究。
In this paper the author first analysed the wind effects on bridges , and wind - induced vibration is described in particular . second , two methods for wind effects on bridges are discussed , which include the method of gust response factors and the method of buffeting response spectrum . thirdly , from the requirement of practical engineering , the accurate analysis method is simplified according through the parametric analysis , the formula for engineering application of the second method is presented . finally , a realengineering example illustrate the usage of the two methods . and the result of the engineering example show that the stress calculated by buffeting response spectrum method is larger than which calculated from the gust response factor methed , also the temporary method of wind resistant ways for bridge in cantilever state is presented 第二,分析了桥梁抗风分析的两种方法,包括基于阵风系数的阵风分析法和抖振反应谱分析法。第三,从工程实际应用出发,通过参数分析,对精确方法进行适当简化,推导出了桥梁在悬臂施工中的抖振反应谱法的实用计算公式。最后,通过工程实例,采用两种抗风分析方法分别进行了分析计算,实例分析的计算结果说明反应谱法计算得到的内力大于按阵风系数法得到的内力;同时提出了在悬臂施工状态工程施工中的临时抗风措施。
The main research work covers the following aspects : ( 1 ) the random vibration approach , response spectrum method and time history scheme are compared systematically . a great deal of numerical analyses are conducted to investigate the dynamic responses of bridges with different spans subjected to homogeneous / non - homogeneous seismic excitations 主要进行的研究工作如下: ( 1 )将随机振动法、反应谱法和时程分析法进行了系统比较,作了大量数值计算,分析了不同跨度桥梁在一致非一致地震激励下的动态响应。