摘要
前人曾较详细地分析过悬索桥主塔的弹塑性稳定问题,考虑了风荷载对主塔的稳定影响等,但分析对象均为孤立主塔。参照江阴长江大桥桥塔的实际情况,在考虑纤维模型双重非线性的基础上,使用自编程序MockCool分别对孤立主塔和考虑主缆等构件对主塔影响的整桥模型进行弹性稳定和大位移弹塑性分析。结果表明,就所论的两种计算模型而言,虽然二者的弹性失稳问题均属于第二类极值型稳定问题,但是由于主缆的影响,不仅弹性失稳模态不同,而且弹塑性极限承载力的差别也很大,孤立主塔模型将高估结构真实工作时的承载能力。
The plastic stability of suspension bridge main tower was once studied in detail,such as the impact of wind load and so on,but all the analysis objects were isolated main towers.Refers to the Jiangyin bridge,two fiber models are established by self program MockCool to carry on elastic stability analysis and large displacement elastic-plasticity analysis.The first model is isolated tower,and the other is entire bridge model considering main cable,stiffening girder and poles.The result shows that due to the different boundary conditions,in terms of the two models,although the two's elastic instability belongs to the second kind of extreme value stable question similarly,the elastic buckling modes are quite different as well as the elastic-plasticity ultimate bearing capacities.The structure real work bearing capacity will be overestimated according to the isolated tower model analysis result.
出处
《土木工程学报》
EI
CSCD
北大核心
2010年第S2期187-193,共7页
China Civil Engineering Journal
基金
国家自然科学基金重大研究计划(90715021)
关键词
桥塔
极限承载力
双重非线性
弹性稳定分析
大位移弹塑性分析
main tower
ultimate bearing capacity
bi-nonlinear
elastic stability analysis
large displacement elastic-plasticity analysis
