大跨网格结构倒塌模式与多维隔减震控制研究

发布时间：2018-01-11 03:12

本文关键词：大跨网格结构倒塌模式与多维隔减震控制研究　出处：《东南大学》2015年博士论文　论文类型：学位论文

【摘要】：自二十世纪初空间网格结构诞生以来,因其特有的跨越能力大、结构轻盈优美等特点,已经发展成为大型结构工程中重要的结构形式。然而,此类结构常用于人群密集的公共设施建设,如火车站、体育馆等,一旦倒塌会带来巨大的生命和财产损失。由于结构跨度大、杆件数目繁多,其在遭遇强烈荷载作用时,将发生严重的非线性力学行为,给结构设计师掌握此类结构的抗震性能及判定结构在特定的荷载作用下是否失效和倒塌带来了很大的困难。本文在国家自然科学基金重大研究计划“多维地震下大跨空间网格结构倒塌模式与隔减震控制研究”等基金的资助下,采用理论推导、数值计算和试验验证相结合的方法,系统研究了考虑下部支承结构与上部网格结构耦合效应的大跨空间网格结构的动力灾变响应、失效机理和倒塌破坏模式,给出描述结构失效的特征指标,研究地震能量在大跨空间网格结构的网格之间的传递分配规律,揭示能量在系统中的传递、分布与结构的灾变响应之间的内在联系。主要研究工作和重要结论如下：(1)提出了基于能量的大跨网格结构弹塑性稳定度指标基于能量原理和传统弹性稳定度的概念,推导并提出了大跨网格结构弹塑性稳定度指标,以此作为描述结构失效的特征指标。该指标可以通过一次非线性动力时程分析直接判定某特定地震荷载作用下结构是否失效,与传统的通过绘制荷载幅值与结构特征响应之间的关系曲线来判定结构是否失效的增量动力分析法相比,计算量大幅减少。以经典的六角星形歌德斯克穹顶网壳为例,验证了所提出的弹塑性稳定度指标的合理性和正确性,说明该指标可以作为增量动力法的一种辅助判定方法,判定结构是否失效。(2)基于弹塑性稳定度指标分析的某大跨双层平板网架结构失效判定以一双层平板网架结构为研究对象,用基于能量的弹塑性能量稳定度指标判定该网架结构是否失效,研究多维地震动作用下结构弹塑性稳定度指标和结构强度指标、变形指标之间的联系规律,发现该指标与传统的由结构基于强度和变形判断结构失稳判断的方法相比,对结构是否失效的判断更加直观,基于能量法的弹塑性能量稳定度指标能揭示大型网格结构失效的内在规律,且更加安全可靠。(3)地震能量在大跨空间网格结构内部的传递分配规律研究通过双非线性动力时程分析,研究地震能量在大跨空间网格结构内部的传递分配规律,揭示系统中能量传递、分布与结构的灾变响应、构件内力和损伤之间的内在联系。(4)研究大跨结构多维隔减震装置的减震效果基于大跨空间网格结构多维隔减震装置(已获国家发明专利,授权号：ZL 200610097219.3)的性能试验与理论研究,建立了安装多维隔减震装置的大跨空间网格结构模型和分析方法,进行受控大跨空间网格结构在多维地震下的动力灾变分析、损伤过程和失效机理研究,分析了多维隔减震装置对大跨空间网格结构多维抗震能力的影响,证明了用该装置对结构失效、倒塌进行控制的合理性和可行性。(5)进行安装与未安装多维隔减震装置的大跨网格结构地震模拟振动台试验对安装与未安装多维隔减震装置的大跨空间网格结构进行振动台试验,考察多条不同激励幅值地震波对大跨空间网格结构动力特性和灾变响应的影响,验证装置对大跨空间网格结构多维抗震能力的实际提高程度,验证所提的受控大跨空间网格结构的计算模型和灾变响应分析方法的合理性。本文的创新点主要体现在：(1)提出了基于能量的弹塑性稳定度指标,以此作为判定结构失效与否的特征指标。(2)研究地震能量在双层平板网架结构内部的传递分配规律,揭示能量传递、分布与结构的灾变响应、构件内力和损伤之间的内在联系。(3)对安装与未安装多维隔减震装置的大跨空间网格结构分别进行振动台试验,明确了装置的隔震和减震性能,验证了安装多维隔减震装置大跨空间网格结构的计算模型和灾变响应分析方法的准确性。
[Abstract]:Since early twentieth Century the space grid structure was born, because of its large span, light and graceful structure characteristics, it has become the important structural form of large structures. However, this kind of structure has been widely used in the construction of public facilities such as crowded, train station, gymnasium, once the collapse will bring huge loss of life and property. Due to the structure of large span, the number of its members, in the event of a strong load will occur, the nonlinear mechanical behavior is serious, the seismic performance of this structure and determine whether the loads in the structure under the specific failure and collapse is difficult to grasp the structure designer in this article. The major research plan of the National Natural Science Foundation under multi-dimensional seismic spatial reticulated structures collapse mode and damping control of "fund, by theoretical derivation, numerical calculation Method and test combined, considering the dynamic disaster supporting structure and upper grid structure coupling effect of long-span space grid structure response system to study the failure mechanism and collapse mode, describes the characteristics of structural failure, study the distribution of seismic energy between grid spatial reticulated structures. To reveal the energy transfer in the system, the intrinsic link between the distribution and structure of the disaster response. The main research work and conclusions are as follows: (1) the large span grid structure elastic energy and plastic stability index of energy principle and traditional elastic stability based on the concept based on the derived and large span grid structure. The plastic stability index is put forward, as a characteristic index to describe structural failure. The index can be through a nonlinear dynamic time history analysis directly determine a particular earthquake Under the load of structure failure, and by drawing the relation curve between load response amplitude and structure characteristics of the traditional incremental dynamic structure to determine whether the failure analysis method, reduce the computation. In the classic six star Gedesike dome as an example, verified the rationality and correctness of the proposed elastoplastic stability index, the index can be used as an auxiliary method for determining the incremental dynamic method to determine whether the structure failure. (2) the analysis of elastoplastic stability index of a long-span double-layer plate truss structure with a double failure criterion of plate grid structure as the research object based on energy elastic-plastic energy stability to determine whether the failure index structure based on the structure under the action of elastic-plastic stability index and structural strength index of multidimensional earthquake, contact deformation between the indexes, found The index and the traditional structure by the strength and deformation of the buckling structure judgment based on the judgment of whether the failure of the structure compared to determine a more intuitive, energy method of elastic energy stability index can reveal the inherent law of large failure based on grid structure, and more safe and reliable. (3) the double nonlinear time history through the analysis of the seismic energy in the transfer of the distribution of large span spatial structures within the study of seismic energy distribution in large span spatial structures, reveal the energy transfer system, distribution and structure of the disaster response, the intrinsic link between the internal force and the damage component. (4) the damping effect of long-span structure multidimensional damping device based on large-span space grid structure (multidimensional damping device has won the national invention patent, license number: ZL 200610097219.3) performance test and theory research, set up an With multidimensional damping device of large-span space grid structure model and analysis method, dynamic analysis of disaster controlled long-span structure under multiple earthquake the damage process and failure mechanism, analyzes the influence of multidimensional damping device of long-span space grid structure of multidimensional seismic capacity, proved the failure on the structure the device, the feasibility and rationality of control (5). The collapse of the shaking table test installation is not installed and multidimensional damping device of Long-span Grid Structure shaking table test of the installation is not installed with multidimensional damping device of the long-span structure, effects of a plurality of different excitation amplitude of seismic wave on large span the spatial characteristics and the impact on disaster response of power grid structure, improve the degree of the actual verification device of long-span space grid structure of multidimensional seismic capacity, controlled verification of the proposed large span space The calculation model and catastrophe between grid structure response rationality analysis method. The innovation of this paper is mainly reflected in: (1) the energy elastic-plastic stability index based on the determination of the structure as a failure characteristic index. (2) study the distribution of seismic energy in the internal double flat grid structure and reveal the energy transfer, distribution and structure of disaster response, the intrinsic link between internal force and damage components. (3) the installation is not installed with multidimensional damping device of the long-span structure were shaking table test, clear the device isolation and damping performance of the model is verified and the catastrophic space grid structure install the multidimensional damping device of large span in response to the accuracy of the analysis method.

【学位授予单位】：东南大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU399;TU352.1

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