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某钢结构人行天桥动力特性测试及有限元分析 总被引:1,自引:0,他引:1
对一振动较大的人行天桥进行了动力实测,利用有限元分析软件SAP2000建立该结构的有限元模型,利用基于实测数据的频谱分析以及模态分析的方法对其出现的振动问题进行分析,确定结构振动水平,并为同类结构的动力特性研究提供参考。此外,还从通行行人和通行车辆这两个因素对该天桥侧向振动过大的原因进行了深入分析,从而找到了造成该天桥产生实测振动特性的主要原因,对结构出现过大侧向振动给出了合理解释。 相似文献
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针对一出现较大振动的人行天桥,利用有限元分析软件建立了计算模型并进行了动力特性分析,同时对结构进行了动力测试。实测数据与修正后的有限元模型分析结果吻合较好,利用分析结果对该天桥的振动水平做出判断,结果也比较吻合。在此基础上找到了引起结构振动的主要振动源,为结构后继的加固改造提供关键信息。这一方法效果较好,可为今后类似工程提供参考。 相似文献
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某轻型柔性钢结构人行天桥的动力特性分析 总被引:1,自引:0,他引:1
孙道远 《四川建筑科学研究》2011,37(3):60-64
以某轻型、柔性钢结构人行天桥为工程背景,对该人行天桥进行了现场动力测试,运用有限元分析软件SAP2000建立了该天桥的有限元模型并对其模态参数进行了分析,通过参数分析得到了结构振动频率和各参数之间的关系,更好地了解了结构的动力特性。基于这一关系及动力实测结果,对初始有限元模型进行了修正,从而得到了天桥结构的基准有限元模型,此基准有限元模型对该结构今后的加固改造及振动状态评估具有宝贵的参考意义。 相似文献
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针对某人行天桥发生较明显振动,实测其上部结构动力特性,采用峰值拾取法(PPM)和加强型频域分解法(EFDD)两种参数识别技术分析得到天桥竖向、侧向的各阶振动频率等模态参数,并据此建立SAP2000有限元对比模型;分别采用狄克曼指标从频率和振幅,采用烦恼率曲线从加速度角度对该人行天桥的动力响应做出了全面的舒适度评估。综合使用模态分析和舒适度评估方法避免了以往单一评价桥梁结构动力学特性的弊端,不仅可为后期加固提供准确可靠的技术支持,也为解决同类问题提供参考。 相似文献
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某钢结构人行天桥动力特性漏试及分析 总被引:1,自引:1,他引:0
钢结构人行天桥是一种特殊的结构形式。通过对某钢结构人行天桥进行动力特性测试和有限元分析,评估了天桥结构的舒适性,并为同类结构的动力特性研究提供参考。 相似文献
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介绍了对一座钢结构人行桥进行的全桥动力测试,并对结构的动力特性进行了分析。利用有限元计算软件进行了结构模态分析,通过参数分析找到了各参数与结构振动频率之间的关系。基于这一关系以及实际动力测试结果,通过对有限元模型参数进行一系列修正,建立起可用于该结构加固改造前后状态评估的基准有限元模型。该方法以及参数分析后得到的相关结论可为类似结构的设计与加固改造提供借鉴。 相似文献
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对某钢结构大跨度人行天桥在地铁振动作用下的受迫抖振做现场实桥测试,利用频谱分析和有限元分析方法,对天桥上部结构进行模态参数分析.根据工程振动理论得出,由地铁振动诱发的地基振动优势频率与天桥上部结构低阶自振频率相近,由此引发结构共振效应,基础振动相对运动传递率过高是造成天桥梁体抖振的主要原因. 相似文献
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Bijaya Jaishi Wei-Xin Ren Zhou-Hong Zong Prem Nath Maskey 《Engineering Structures》2003,25(14):1827-1839
Old temples built in ancient time in Nepal are traditional and monumental structures with historic and archaeological importance. It is now an essential issue to evaluate their seismic safety for future earthquakes. Seismic evaluation method needs the fundamental dynamic properties of the temples. In this paper, dynamic properties of selected 10 typical multi-tiered temples are obtained by using the finite element method. Three of those temples are tested by ambient vibration methods under wind-induced excitation to obtain the real dynamic properties and validate the finite element models. Based on validated finite element model from the test, an empirical formula is proposed to estimate the natural period of vibration of Nepalese temples. Seismic capacity evaluation is then performed using the seismic coefficient method. To achieve a more realistic result, 3D dynamic analysis is carried out by the response spectrum method. Results show that the masonry temples in Nepal have fundamental time period less than 0.6 s. Damping ratio lies between 1% and 6%. The most crucial parts of Nepalese temples are the piers between the openings at the base level. Most of the failure modes are associated with tensile and compressive stresses. 相似文献
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阐述了利用有限元分析软件ANSYS建立钢管混凝土拱桥的计算模型的方法,并利用有限元模型对桥梁进行了理论模态分析,计算出自振频率、振型等动力参数,对其振型特征进行了分析和研究,以期全面的评价桥梁结构的动力性能。 相似文献
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W.H. ChenZ.R. Lu W. LinS.H. Chen Y.Q. NiY. Xia W.Y. Liao 《Engineering Structures》2011,33(12):3628-3646
The Guangzhou New TV Tower (GNTVT) in Guangzhou, China, is a supertall tube-in-tube structure with a total height of 600 m. A complicated structural health monitoring (SHM) system consisting of over 800 sensors has been implemented to the GNTVT for both in-construction and in-service real-time monitoring. By making use of this SHM system, the ambient vibration measurement is carried out in a continuous and long-term manner. This paper presents the analytical and experimental modal analysis of the tower and the field ambient vibration measurement at different construction stages and under different excitation conditions, particularly addressing the following issues: (1) a reduced-order FE model for the GNTVT; (2) field vibration measurement and modal parameter identification of the tower under construction and two environmental excitations (typhoon and earthquake); and (3) comparison of results under different excitation events in the time-frequency domain and correlation between natural frequencies and air temperature using linear regression analysis. The experimental dynamic characteristics of the tower can be used to update the finite element of the tower, so that the updated finite element model of the tower can be obtained, which will serve as the baseline model for future health monitoring and damage detection. They can also be used to verify the effectiveness of vibration control devices installed on the tower. 相似文献
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夹层玻璃板PVB动力损伤检测的有限元格式 总被引:1,自引:0,他引:1
提出了一种夹层玻璃板的一阶剪切变形位移模式,由此建立了静力计算和自由振动的八结点有限等参单元公式.同时本文将“频率变化比”方法应用到夹层玻璃板PVB损伤检测中,用推导出的有限元公式建立了频率变化比法的分析过程. 相似文献
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HUANG Minshui ZHU Hongping LI Lin GUO Wenzeng 《Frontiers of Structural and Civil Engineering》2008,2(2):139
The dynamic characteristics of bridge structures are the basis of structural dynamic response and seismic analysis, and are also an important target of health condition monitoring. In this paper, a three-dimensional finite-element model is first established for a highway bridge over a railroad on No.312 National Highway. Based on design drawings, the dynamic characteristics of the bridge are studied using finite element analysis and ambient vibration measurements. Thus, a set of data is selected based on sensitivity analysis and optimization theory; the finite element model of the bridge is updated. The numerical and experimental results show that the updated method is more simple and effective, the updated finite element model can reflect the dynamic characteristics of the bridge better, and it can be used to predict the dynamic response under complex external forces. It is also helpful for further damage identification and health condition monitoring. 相似文献
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大跨度连续刚构桥有限元建模与动力特性分析 总被引:3,自引:0,他引:3
本文采用有限元软件ANSYS建立某大跨连续刚构桥有限元模型,通过该模型的模态分析结果和实桥的环境振动测试结果的比较,得出一些有意义结论。 相似文献