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建筑物的沉降预测,一直是建筑结构的重要课题之一.应用灰色系统理论建立建筑物沉降的灰色理论预测模型,可应用于建筑物的沉降预测,具有一定的应用参考价值. 相似文献
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基于人工神经网络的建筑物沉降预测 总被引:4,自引:0,他引:4
根据建筑物实测沉降利用人工神经网络理论 ,建立了前馈网络预测模型并提出新的学习算法 ,结合某建筑物纠偏工程实例对建筑物沉降进行了预测。预测结果表明神经网络方法是可行且有效的 相似文献
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根据近年来广东地区花岗岩残积土上几处高层建筑物的固结沉降观测的工程实例,对花岗岩残积土地区建筑物沉降固结与时间的关系特性进行了分析,为该地区建筑物沉降预测奠定了理论基础。 相似文献
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深基坑墙顶水平变形的灰色-时序动态预测 总被引:1,自引:0,他引:1
深基坑墙顶水平变形是一个动态的相互依存的过程。在基坑开挖与施工过程中 ,根据变形观测数据用灰色系统理论与时间序列分析方法建立等维新息动态预测预报模型 ,并随着新数据的加入适时修改模型参数。该模型不要求考虑复杂的变形影响因素。工程实例研究表明 :用组合模型预测变形值 ,其误差大多数情况下小于 5 % ;在变形数据变化较大时 ,组合模型预测值明显优于单一模型预测值。在变形变化平稳时 ,用单一的灰色模型或灰色时间序列组合模型预测误差相差不大。预测步数越多 ,则预测精度越低。 相似文献
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Heating, ventilation and air-conditioning (HVAC) system is the major electricity consumer in an air-conditioned building; therefore, an accurate cooling load calculation method is indispensable. ASHRAE has developed a Radiant Time Series (RTS) method to improve the accuracy of cooling load calculation. However, outdoor design conditions and occupant load patterns vary with the buildings and cities. This study discusses the development of a new example weather year and a mathematical model to generate design occupant load profiles using Monte Carlo simulation for a subtropical climate. The results would be useful for determining the HVAC energy consumption in buildings in order to obtain more representative data for the prediction of annual energy consumption. 相似文献
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Linear static (LS), nonlinear static (NS) and nonlinear dynamic analyses were conducted to estimate the progressive collapse resistance of a reinforced concrete building. The step‐by‐step procedure recommended by the US General Service Administration was used for the LS analysis. Load‐displacement response curves were compared to investigate the force‐based dynamic amplification factor (DAF), which was defined in this study. It was observed that a constant DAF equal to 2·0 was conservative for estimating the collapse resistance of a ductile column‐removed building. However, the LS procedure may fail to appropriately simulate the inelastic response of the building. A capacity curve, constructed from the NS load‐displacement response, may be applied to prediction of the collapse resistance and DAF for a column‐removed building. An analytical method was proposed to demonstrate the dependency of the DAF on hinge model parameters. The proposed method was capable of predicting the collapse resistance and the force‐based DAF of an inelastic structure under vertical downward loadings. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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堆积层滑坡位移矢量角的R/S分析--以新滩滑坡分析为例 总被引:2,自引:0,他引:2
基于新滩滑坡位移观测资料,运用分形理论的R/S分析方法对滑坡位移过程中的位移矢量角变化规律进行了初步的研究,发现边坡位移矢量角的赫斯特指数H值随着边坡的失稳而呈明显的下降趋势,表明位移矢量角具有与滑坡稳定状态同步的动态变化过程,说明在滑坡预测预报过程中,位移矢量角是一个不可忽视的变量. 相似文献
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建筑基坑施工中,变形监测是基坑是否安全的重要环节,将灰色系统理论应用于基坑变形监测的数据分析,结合工程实例,可进行变形预测结果的分析和检验,进而证实基坑位移变形分析中采用灰色GM(1,1)预测方法的可行性。该方法的拟合度较高,有其适用性。 相似文献
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滑坡速度倒数法预测模型加速开始点识别及临滑时间预测研究 总被引:1,自引:0,他引:1
对矿山或自然土质和岩质边坡而言,大多数滑坡预报都是基于边坡变形三阶段蠕变理论,并根据临滑前加速变形阶段即开始加速点(onset of acceleration,OOA)之后的位移进行滑坡时间预测研究。在分析S-SAR型边坡雷达连续监测的位移后,发现以OOA作为速度倒数法(inverse velocity method,INV)分析的开始点(starting point,SP),所预测的滑坡时间具有一定滞后性。基于变形速度随机变量在斜坡处于匀速变形阶段时服从正态分布特征,提出一种应用正态分布置信区间来动态识别SP位置的方法。通过将S-t坐标系统一量纲后转换成T-t坐标系,建立一种T-lgt的滑坡时间预测模型,此模型应用SP位置后的位移数据可以效提高滑坡预测时间准确性。 相似文献
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Hyo Seon Park Jun Hyeok Kwon 《The Structural Design of Tall and Special Buildings》2003,12(4):317-333
An optimal drift design model for a linear multi‐story building structure under dynamic lateral forces is presented. The drift design model is formulated into a minimum weight design problem subjected to constraints on stresses, the displacement at the top of a building, and inter‐story drift. The optimal drift design model consists of three main components: an optimizer, a response spectrum analysis module, and a sensitivity analysis module. Using a small example, the validation of the proposed model has been tested by a comparison of optimal solutions. Then, the performance of the optimal drift design model is demonstrated by application to three steel frame structures including a 40‐story building. Various structural responses including lateral displacement and inter‐story drift distributions along the height of the structure at the initial and final design stages are presented in figures and tables. Time‐consuming trial‐and‐error processes related to drift control of a tall building subjected to lateral loads is avoided by the proposed optimal drift design method. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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在系统分析降雨型堆积层滑坡位移与失稳动因与机制的基础上,首次提出卸加载响应比理论的基本原理.将降雨量的变化作为滑坡的卸加载参数,相应平均位移速率的变化值为卸加载响应参数,由此确定的位移卸加载响应比作为位移动力学参数,根据堆积层滑坡位移动力学规律论证了该位移动力学参数在滑坡预测预报的可行性和有效性,建立卸加载响应比预测模型.以新滩滑坡分析为例,运用卸加载响应比预测模型对新滩滑坡关键部位监测点A3、B3进行了卸加载响应比计算,发现这两点的卸加载响应比时序曲线均在失稳前发生突变,其突变时间与边坡实际失稳时间完全吻合.上述研究结果证明了卸加载响应比理论是可以应用于堆积层滑坡中短期预测预报的一种有效方法. 相似文献