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对各类边界条件的局部劣化梁桥进行了结构分析,引入弹性铰模拟局部劣化区对梁桥变形的影响,建立了含局部劣化梁的挠曲线近似表达式。在此基础上给出了对局部劣化复杂支撑梁的物性参数和边界条件进行耦合识别的算法。用有限元结构分析结果模拟传感器埋设点的挠度实测值,对两端固支超静定梁的断裂参数和边界条件进行耦合识别的算例结果表明,模型构造合理,迭代过程收敛快,算法简便,精度高。 相似文献
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在文献的基础上探讨了正交正放类网架的静力计算问题。文中采用网架的拟夹层板连续化模型,网架的静力控制方程采用六阶偏微分方程,应用加权残值法中的样条配点法计算网架的挠度和内力。文中给出若干算例,计算效果良好. 相似文献
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An effective analytical approach is developed for the problem of particulate composites containing spherical inclusion with imperfect iraerface between the matrix and spherical inclusions. In this paper, a general interface model for a variety of interracial defects has been presented, in which both displacement discontinuity across the interface and the elastic moduli varing with radius outside of the inclusion are considered. The imperfect interface conditions are appropriate in the case of thin coatings on the inclusion. Furthermore, in the ease of thin elastic interphase , the displacement field and the stress field in the inclusion and matrix are exactly solved for the boundary problem of hydrostatic compression of an infinite spherical symmetrical body by Frobenius series, and the erpression of the normal interface parameter, Dr, is derived. In addition, it has been proved that two previous results derived in some literatures by considering the interface to be a thin iruetptmse with displacement jump or with some variance in its moduli can be reverted from the present formula, respectively. Numerical results are given to demonstrate the significance of the general imperfect interface effects. 相似文献
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水中双向正交加肋圆柱壳体声辐射的有限元法 总被引:1,自引:2,他引:1
水下加肋壳体的结构声问题在水下航行器隐身技术中有更广阔应用。以受谐激励作用的水中双向正交加肋弹性薄圆柱壳为研究对象,考虑介质与结构振动的耦合效应,研究耦合系统的声振问题。解析法求解此类问题存在困难,运用有限元方法计算了双向正交加肋圆柱壳体的声辐射远场声压。算例结果表明:在设置环肋的基础上再加设纵肋,能有效地改善结构的声辐射特性。 相似文献
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移民安置是社会经济发展的产物,随着可持续发展成为世界社会经济发展战略的新时期,社会各界都非常关心建设移民问题,水库移民安置的思想观念和发展方针更是处于巨大转变和发展时期。重点介绍高州水库除险加固工程水库恢复89.0 m正常蓄水位淹没处理移民的安置方式。 相似文献
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基于非线性屈曲理论,以非线性有限元为工具,建立了单层网壳结构的稳定性分析的有效计算方法。将具有广泛适用性的判断结构稳定状态的准则引入到结构强度计算中,使强度问题与稳定问题统一在一起,并以结构当前刚度参数来反映结构的软化程度,采用柱面弧长法进行过程限踪。重点研究了单层柱面网壳的非线性屈曲行为。 相似文献