共查询到20条相似文献，搜索用时 250 毫秒
1.
高层建筑电梯平衡量体系的动力特性与地震反应分析 总被引：1，自引：0，他引：1
本文在文献〔２，１〕所建立的平衡重体系运动方程的基础上，对高层建筑电梯系统中平衡重体系的动力特性进行了探讨，给出了求解该体系自振频率的近似方法，通过对一幢１４层建筑内的平衡重体系进行的大量地震反应分析，研究了其动力反应沿建筑物高度变化的一般规律，给出了最大反应所处的位置。本文的工作为实施和推广文献〔１〕所提出的平衡重体系的抗震控制措施奠定了理论基础。 相似文献
2.
在应用文献[1]方法的过程中，笔者改用博氏变换对稳态反应部分进行逆变换计算，而对瞬态反应部分直接用傅氏系数表示计算。对于相位调整，给出了所调整的实部Ak及虚部Bk的计算式及3种调整的方法。 相似文献
3.
立式储罐基础隔震动力反应特性分析 总被引：17，自引：3，他引：17
本文基于文献[1]建立的立式储罐基础隔震体系，针对阻尼，波高，隔震震频率等因素，进行了分析和研究，给出了工程设计所需的隔震频率、阻尼比并分析了隔震周期对波高控制的影响。 相似文献
4.
空间结构横向动力稳定的有限元摄动分析 总被引：1，自引：0，他引：1
本文研究在竖向谐荷载作用下结构的横向动力稳定问题。与文[2]～[8]不同,本文考虑了竖向谐荷载所产生的几何刚度阵为谐荷载扰频的函数这一情况,提出了一个新的求解方法,给出了相应的公式推导。通过算例得出了必须考虑扰频对动力几何刚度阵影响的重要结论。 相似文献
5.
本文在文献[1]基础上,进一步分析了用Wilson—θ法求解具有折线型非线性特性的结构动力反应分析中拐点处理的精确方法,并详细讨论了变步长Δt’的取值问题。 相似文献
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主震与余震的震级统计关系及其地震动模型参数 总被引：4，自引：1，他引：4
本文从文献[1,2,3]中按一定的筛选原则,挑选出49组主、余震震级资料,通过回归分析,统计出了主震震级与余震震级之间的经验公式。然后,从结构在主、余震作用下的反应分析和抗震设计的需要出发,给出了确定主余震地震动时程曲线的方法,并以文献[4]为基础,确定了主震与余震的随机地震动模型及其参数。 相似文献
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提出了两个假设:在第1自振频率计算中,体外筋预拉力增量产生的弯矩图等效为梁第1振型的比例图,忽略了体外筋对其他自振频率的效应。这两个假设改进了文献[5]中的体外筋预拉力增量与梁跨中位移成正比的假设。建立了体外预应力梁的动力平衡方程,解得梁的振型和自振频率。与文献[5]中的分析方法相比,由于假设更为合理,计算结果也更准确,与数值解吻合良好。计算结果表明:文献[5]方法低估了体外筋对第1自振频率的效应;随着体外筋面积和偏心距的增加,梁的自振频率也随之增加。 相似文献
11.
A time-domain method for the analysis of arch dam-foundation rock dynamic interaction during earthquake was proposed, and
the dynamic relaxation technique was adopted to obtain the initial static response for dynamic analysis by [Du et al. (2005).
The paper has been contributed to Bulletin of earthquake engineering]. In this paper, a nonlinear explicit method in time
domain considering the opening and closing effect of contact joints on arch dam during earthquake is further proposed by introducing
the dynamic contact force model into the method. The simulation accuracy of dynamic contact force model is verified by comparing
its calculation result and test result of scale model on shaking table. Finally, the influence of joints on the seismic response
of Xiaowan arch dam is studied by the proposed method and some conclusions are given. 相似文献
12.
Naohiro Nakamura 《地震工程与结构动力学》2006,35(2):217-231
In order to perform time history earthquake response analyses with consideration to both the dynamic soil–structure interaction and the non‐linear behaviour of the structure, it is important to transform the soil impedance in the frequency domain to the impulse response in the time domain. In this paper, a new transform method with high practicality is proposed. First, the formulation of the proposed transform method is described. Next, the validity of the method is examined using an example problem whose impulse response is analytically obtained. Then, the impedance of the rigid foundation on 2‐layered soil is transformed to the time domain, and the characteristics of the impulse response are investigated. Finally, time history earthquake response analyses of a structure on the soil using the obtained impulse response are carried out. The validity and the efficiency of the proposed method are confirmed through these investigations. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
13.
从电流守恒条件出发,得到了两个积分方程.其中第一个和在1964年提出的相同,它的未知函数是边界面上的隐电流源分布密度;第二个积分方程的未知函数则是电位函数本身. 在的文章以及本文作者的另一篇文章中,供电电极和测量电极都被当成点电极处理.用这种方法来处理电位电极系和梯度电极系已不够准确,用来处理三侧向或双侧向等具有大电极的电极系则完全无能为力. 测井中所用的电极系是包着金属外皮的绝缘心棒,金属外皮就是电极.本文提出了处理这种电极系的方法.结果表明,第二个积分方程在处理这种电极系时有明显优点. 相似文献
14.
Development of Winkler model for static and dynamic response of caisson foundations with soil and interface nonlinearities 总被引：7，自引：0，他引：7
As an extension of the elastic multi-spring model developed by the authors in a companion paper [Gerolymos N, Gazetas G. Winkler model for lateral response of rigid caisson foundations in linear soil. Soil Dyn Earthq Eng; 2005 (submitted companion paper).], this paper develops a nonlinear Winkler-spring method for the static, cyclic, and dynamic response of caisson foundations. The nonlinear soil reactions along the circumference and on the base of the caisson are modeled realistically by using suitable couple translational and rotational nonlinear interaction springs and dashpots, which can realistically (even if approximately) model such effects as separation and slippage at the caisson–soil interface, uplift of the caisson base, radiation damping, stiffness and strength degradation with large number of cycles. The method is implemented in a new finite difference time-domain code, NL-CAISSON. An efficient numerical methodology is also developed for calibrating the model parameters using a variety of experimental and analytical data. The necessity for the proposed model arises from the difficulty to predict the large-amplitude dynamic response of caissons up to failure, statically or dynamically. In a subsequent companion paper [Gerolymos N, Gazetas G. Static and dynamic response of massive caisson foundations with soil and interface nonlinearities—validation and results. Soil Dyn Earthq Eng; 2005 (submitted companion paper).], the model is validated against in situ medium-scale static load tests and results of 3D finite element analysis. It is then used to analyse the dynamic response of a laterally loaded caisson considering soil and interface nonlinearities. 相似文献
15.
多维地震作用下偏心结构的磁流变阻尼器半主动控制 总被引：9，自引：1，他引：8
理论研究与震害经验表明,地震时结构会产生不可忽略的平动与扭转耦合的空间振动。本文提出了基于线性最优控制理论的部分状态反馈次优控制策略和基于遗传算法的控制策略,以Marlab和Simulink为平台,采用磁流变阻尼器对双向水平地震作用下的偏心结构平．扭耦联反应进行半主动控制。对-6层双向偏心框架结构进行控制效果仿真分析的结果证明,本文提出的2种控制策略是有效的。 相似文献
16.
基于非曼辛准则的土动弹塑性模型 总被引：12，自引：0，他引：12
本文基于非曼辛准则提出了两个土动弹塑性模型。在模型中引进了两个模型参数ｎ１，ｎ２，改进了土弹塑性模型的构成方法。给出了在等幅动荷载作用下及非规则荷载作用下这两个参数的确定方法。将本文提出的两个土动弹塑性模型用于土层弹塑性地震反应分析，并与通常采用的等效线性模型的地震反应分析结果做了比较。 相似文献
17.
Estimation of lateral displacement and acceleration responses is essential to assess safety and serviceability of high-rise buildings under dynamic loadings including earthquake excitations. However, the measurement information from the limited number of sensors installed in a building structure is often insufficient for the complete structural performance assessment. An integrated multi-type sensor placement and response reconstruction method has thus been proposed by the authors to tackle this problem. To validate the feasibility and effectiveness of the proposed method, an experimental investigation using a cantilever beam with multi-type sensors is performed and reported in this paper. The experimental setup is first introduced. The finite element modelling and model updating of the cantilever beam are then performed. The optimal sensor placement for the best response reconstruction is determined by the proposed method based on the updated FE model of the beam. After the sensors are installed on the physical cantilever beam, a number of experiments are carried out. The responses at key locations are reconstructed and compared with the measured ones. The reconstructed responses achieve a good match with the measured ones, manifesting the feasibility and effectiveness of the proposed method. Besides, the proposed method is also examined for the cases of different excitations and unknown excitation, and the results prove the proposed method to be robust and effective. The superiority of the optimized sensor placement scheme is finally demonstrated through comparison with two other different sensor placement schemes: the accelerometer-only scheme and non-optimal sensor placement scheme. The proposed method can be applied to high-rise buildings for seismic performance assessment. 相似文献
18.
多点激励下结构随机地震反应分析的反应谱方法 总被引：9，自引：3，他引：6
基于随机振动理论,提出了多点激励作用下线性系统随机地震反应分析的均值反应谱方法,给出了结构峰值反应的均值、标准差以及反应平均频率的反应谱组合公式。这可以将反应谱方法推广应用到多点激励结构的抗震可靠度分析中。鉴于组合公式中谱参数和相关系数需要由烦琐的数值积分得到,本文进一步针对它们给出合理的简化计算式,从而使得建议的反应谱方法的计算效率大大增加。最后,以一个双塔斜拉桥为例,对本文方法进行了验证。基于建议方法的计算结果与Monte Carlo模拟结果吻合较好。与经典的多点激励反应谱方法(MSRS法)比较,本文方法具有其无法比拟的计算效率。 相似文献
19.
抗震结构的等效延性破坏准则及其子结构试验验证 总被引：6，自引：0，他引：6
基于试验结果与分析，本文提出了反映结构低周疲劳特性的“等效延性破坏准则”。将由结构非线性动力反应分析求得的、预计按本文所提破坏准则能引起柱破坏的三种不同位移反应时程，施加于三个柱试件，以验证所提准则的有效性与实用性。 相似文献
20.
JIAN WEN SHEN CHANG QING CAI Shanghai Seismological Bureau Shanghai China 《地震学报(英文版)》1998,11(6):711-718
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