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Seismic Analysis of Reinforced Concrete silos under Far-Field and Near-Fault Earthquakes

Structural Durability & Health Monitoring 2022年第3期16卷 213-233页

作者： Anwer H.Hussein Hussam K.Risan Department of Civil Engineering Al-Nahrain UniversityBaghdad10072Iraq

silos are strategical structures used to stockpile various types of granular *** are highly vulnerable to earthquake excitation and have been frequently reported to fail at a higher rate than any other industrial *** seismic response of silos within the near-fault region will suffer a complex combination of loadings due to the unique characteristics of the near-fault ground motions;which are usually associated with a large amplitude pulse at the beginning of either the velocity or the displacement time *** study aims to numerically evaluate the seismic response of reinforced concrete cylindrical silos under near-fault ground motions(NFGM)and far-field ground motions(FFGM).The assessment investigates the impact of the slenderness ratio and the para-meters’influence on the seismic behavior of reinforced concrete *** validity of the Eurocode provisions in the structural safety of silos will also be *** nonlinear time history analysis is carried out through the finite element approach by examining four silos with different slenderness *** concrete damage plas-ticity model is assigned to the silo wall to simulate the nonlinear behavior of concrete in the plastic zone;while,the behavior of the stored material is represented by the Drucker-Prager plastic *** wall-granular material interaction is considered and defined by coulomb’s friction *** results of the near-fault records reveal a growth up to 72.8%in the hoop stress and 160.4%in the vertical stress compared to the far-field ***,the seismic response of reinforced concrete silos is highly sensitive to the type of ground motion,and slender silos tend to impose greater structural demand under the ***,The Eurocode-8 seismic provisions were adequate in the conventional far-field ground motions and less effective in the near-fault zone.

关键词： silos seismic analysis near-fault earthquake far-field earthquake

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Comparative Analysis of PM10 Emission Rates from Controlled and Uncontrolled Cement silos in Concrete Batching Facilities

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Open Journal of Air Pollution 2023年第2期12卷 67-77页

作者： Ahmed El-Said Rady Mokhtar S. Beheary Mossad El-Metwally Ashraf A. Zahran Environmental Sciences Department Faculty of Science Port-Said University Port Said Egypt Physics Department Faculty of Science Port-Said University Port-Said Egypt Department of Evaluation of Natural Resources Environmental Study Research Institute (ESRI) Sadat City University Sadat City Egypt

This research study quantifies the PM10 emission rates (g/s) from cement silos in 25 concrete batching facilities for both controlled and uncontrolled scenarios by applying the USEPA AP-42 guidelines step-by-step approach. The study focuses on evaluating the potential environmental impact of cement dust fugitive emissions from 176 cement silos located in 25 concrete batching facilities in the M35 Mussafah industrial area of Abu Dhabi, UAE. Emission factors are crucial for quantifying the PM10 emission rates (g/s) that support developing source-specific emission estimates for areawide inventories to identify major sources of pollution that provide screening sources for compliance monitoring and air dispersion modeling. This requires data to be collected involves information on production, raw material usage, energy consumption, and process-related details, this was obtained using various methods, including field visits, surveys, and interviews with facility representatives to calculate emission rates accurately. Statistical analysis was conducted on cement consumption and emission rates for controlled and uncontrolled sources of the targeted facilities. The data shows that the average cement consumption among the facilities is approximately 88,160 (MT/yr), with a wide range of variation depending on the facility size and production rate. The emission rates from controlled sources have an average of 4.752E-04 (g/s), while the rates from uncontrolled sources average 0.6716 (g/s). The analysis shows a significant statistical relationship (p < 0.05) and perfect positive correlation (r = 1) between cement consumption and emission rates, indicating that as cement consumption increases, emission rates tend to increase as well. Furthermore, comparing the emission rates from controlled and uncontrolled scenarios. The data showed a significant difference between the two scenarios, highlighting the effectiveness of control measures in reducing P

关键词： Emission Factors Concrete Batching Cement Dust PM10 Fugitive Emissions silos Environmental Impact Air Quality Ready-Mix Industrial Facilities

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Relationship between mass discharge rate and granular temperature of silo flow with variance of outlets

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Particuology 2022年第4期20卷 76-82页

作者： Quan Chen Ran Li Wengzheng Xiu Vladimir Zivkovic Hui Yang School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Medical Instrument and Food Engineering University of Shanghai for Science and Technology Shanghai 200093China School of Engineering.Newcastle University NE17RUUnited Kingdom

A lower granular temperature zone near the orifice in silos was found by speckle visibility spectroscopy ***,the values of granular temperature in this area are inversely proportional to the mass discharge rate(MDR).This finding that links the macroscopic MDR with mesoscopic dynamics temperature of the particle system,is obtained by looking at the effect that different outlet sizes of silos on MDR and granular temperature *** from evidencing the relevance of a parameter that has been traditionally overlooked in silos,this relationship supposes a benchmark with which to explore the influence of small orifice sizes on *** these,we found that the frequency of intermittent clogging and their dependence on the size of the outlet.

关键词： silos Granular flow Granular temperature Mass discharge rate

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欧洲筒仓荷载规范解析

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粮食流通技术 2013年第6期 8-11页

作者：段君峰李坤由国家粮食储备局郑州科学研究设计院郑州450053

本文通过对欧洲筒仓荷载规范Eurocode 1—Actions on structures—Part 4:silos and tanks(EN 1991—4:2006)体系的介绍,并以细长筒仓为例进行了内力计算,希望对业内同仁得以借鉴和参考。

关键词：欧洲规范钢筋混凝土筒仓 silos 内力计算

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