The effect of strength parameters on the seismic performance of an arch dam using an uncertainty model

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-01-01 DOI:10.7764/rdlc.20.3.602

M. Pasbani Khiavi, P. Ahmadi, R. Daneshfaraz

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引用次数: 0

Abstract

Considering the importance of the effect of concrete arch dam body strength on their seismic performance, this research evaluated the effect of Young Modulus of both the body concrete and foundation as strength parameters and examines the responses to achieve the optimal body stiffness using probabilistic and uncertainty method. The ANSYS software was used to complete the finite element analysis of the dam-reservoir-foundation system and the Monte Carlo method, which is a new method for parametric study and sensitivity analysis, was used for uncertainty analysis. For seismic analysis, the horizontal and vertical components of Northridge, San Fernando and El Centro earthquakes are separately applied in 3d directions. The earthquake components were scaled to the maximum credible level of ground motion acceleration. The foundation rock is simulated using a massless foundation model and dam-reservoir-foundation interaction is considered for seismic analysis of system. The results show the effect of the modulus of elasticity of the concrete which is directly related to the stiffness of the system. The results indicate the effect of the dam body concrete stiffness on the responses. According to the design criteria, it is possible to investigate the safety status of the dam and select the optimal state in terms of structural strength for the model. However, in order to properly select the modulus of elasticity of the concrete of the dam body, it is necessary to consider the simultaneous effect of the stiffness of the foundation and to select the optimal value.

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用不确定模型研究了强度参数对拱坝抗震性能的影响

考虑到混凝土拱坝坝体强度对其抗震性能的重要影响，本研究评估了坝体混凝土和基础杨氏模量作为强度参数的影响，并采用概率和不确定性方法研究了实现最优坝体刚度的响应。采用ANSYS软件对坝-库-基系统进行有限元分析，采用蒙特卡罗方法进行不确定性分析，蒙特卡罗方法是一种新的参数化研究和灵敏度分析方法。在地震分析中，在三维方向上分别应用了北岭地震、圣费尔南多地震和埃尔森特罗地震的水平分量和垂直分量。地震分量被缩放到地面运动加速度的最大可信水平。采用无质量地基模型对基岩进行了模拟，并考虑了大坝-水库-地基的相互作用，对系统进行了地震分析。结果表明，混凝土弹性模量的影响与体系的刚度直接相关。结果表明，坝体混凝土刚度对响应有一定的影响。根据设计准则，可以研究大坝的安全状态，并根据结构强度选择模型的最佳状态。然而，为了合理选择坝体混凝土弹性模量，必须考虑基础刚度的同时作用，并选择最优值。

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来源期刊

Revista de la Construccion 工程技术-工程：土木

CiteScore

2.30

自引率

21.40%

发文量

期刊介绍： The Journal of Construction is aimed at professionals, constructors, academics, researchers, companies, architects, engineers, and anyone who wishes to expand and update their knowledge about construction. We therefore invite all researchers, academics, and professionals to send their contributions for assessment and possible publication in this journal. The publications are free of publication charges. OBJECTIVES The objectives of the Journal of Construction are: 1. To disseminate new knowledge in all areas related to construction (Building, Civil Works, Materials, Business, Education, etc.). 2. To provide professionals in the area with material for discussion to refresh and update their knowledge. 3. To disseminate new applied technologies in construction nationally and internationally. 4. To provide national and foreign academics with an internationally endorsed medium in which to share their knowledge and debate the topics raised.