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slenderness ratio Influence on the Structural Behavior of Residential Concrete Tall Buildings

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Journal of Civil Engineering and Architecture 2011年第6期5卷 527-534页

作者： Tarek A. Awida Faculty of Engineering Ain Shams University Cairo Egypt

The main concern of this paper is to study the influence of the building slenderness ratio on the structural behavior of the residential concrete tall buildings aiming to deepen structure and architect designers understanding for such type of buildings. The study is emphasized only on Kuwait city design conditions for wind and seismic loadings. The paper presents an actual case study for adding two thirty stories residential towers with two different slenderness ratios to an existing residential complex. Wind loading is considered using both code values and wind tunnel results. Three dimensional finite element techniques through ETABS software are used in conducting analysis for structures presented here. A serviceability study is performed to ensure that buildings have sufficient stability to limit lateral drift and peak acceleration within the acceptable range of occupancy comfort. In addition, an ultimate strength study is carried out to verify that all the structural elements are designed to withstand factored gravity and lateral loads in a safe manner according to the international building codes. Analysis results are presented and discussed. A brief idea about foundation design of the new towers and its connection to the existing foundation is presented. Finally conclusions are summarized as guidelines for the structural professions of concrete residential tall buildings.

关键词： slenderness ratio residential tall buildings finite element reinforced concrete analysis and design.

Determination of the load bearing capacity of pre-stressed expandable props for ground support in underground mines

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矿业科学技术学报:英文版 2023年第8期33卷 977-990页

作者： Kunmeng Li Kaiyuan Jiang Yuanhui Li Xin Wang Kai Liu Shuai Xu Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines School of Resources and Civil EngineeringNortheastern UniversityShenyang 110819China Key Laboratory of Liaoning Province on Deep Engineering and Intelligent Technology School of Resources and Civil EngineeringNortheastern UniversityShenyang 110819China China-Canada Centre of Deep Mining Innovation Key Laboratory of Ministry of Education on Safe Mining of Deep Metal MinesSchool of Resources and Civil EngineeringNortheastern UniversityShenyang 110819China Department of Engineering Science University of OxfordOxford OX13PJUnited Kingdom

This paper aims to determine the load bearing capacity of pre-stressed expandable props with different geometries and load eccentricities for flexible support in underground mining or *** is deduced that the expandable device could have much higher strength(>89 MPa)by laboratory tests,and the load bearing capacity of the expandable prop may depend on the stability of the supporting steel pipe structure.A good agreement was found between the laboratory test and numerical results in terms of the load bearing capacity and the final macro-bending failure pattern for expandable props with heights of 1.5 and 2.7 m,and the theoretical calculation for the strength of traditional steel structures is not directly suitable for the expandable ***,additional numerical simulations were performed for the expandable props with different normalized slenderness ratiosλ_(n)and loading eccentric distances *** variation of stability coefficient of the expandable prop is in line with the Perry-Robertson equation and its correlation coefficients are fitted as a of 0.979 and b of *** estimating the load bearing capacity of the expandable props,the strength equation for traditional steel structures is improved by introducing a bending magnification factor and by modifying the normalized slenderness ratio to a converted slenderness *** on the underground field monitoring for the strength of expandable props with different heights,the empirical eccentric distances were back calculated,and a safety factor is introduced to obtain the designed strength of the expandable *** addition,a four-step design procedure is proposed for the expandable prop.

关键词： Pillar stability Load bearing capacity Expandable prop slenderness ratio Eccentric distance

Role of stress,slenderness and foliation on large anisotropic deformations at deep underground excavations

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International Journal of Mining Science and Technology 2021年第4期31卷 577-590页

作者： Bo Hu Mostafa Sharifzadeh Xiating Feng Wenbin Guo Roo Talebi State Key Laboratory of Mountain Bridge and Tunnel Engineering School of Civil EngineeringChongqing Jiaotong UniversityChongqing 400074China Northern Star Resources Ltd. KalgoorlieWA 6430Australia Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang 110819China Engineering Research Centre for the Safe Exploitation and Comprehensive Utilization of Mineral Resources at Universities of Inner Mongolia Hulunbuir UniversityHulunbuir 021008China Western Australian School of Mines(WASM) Curtin UniversityKalgoorlieWA 6430Australia

High stress concentrations around underground excavations can result in significant damage to deep hard-rock *** conditions can be the result of stopping activities,blasting,seismicity,or other mining *** anisotropic deformation and excavation closure,especially under high-stress conditions,are expected if the excavation is located in a foliated or thin-bedded rock *** this research,the behaviour of excavations under deep and high-stress conditions was investigated and *** main purpose was to enhance the existing knowledge of managing large anisotropic deformations and to help prepare suitable measures for handling such *** simulations using the distinct element method(DEM)and model calibration were performed to reproduce the anisotropic deformation of an ore drive based on the collected field ***,the roles of key factors(*** ratio,slenderness ratio,foliation orientation,and foliation considering excavation orientation)on the large deformation and damage depth of the excavations were *** study found that increasing both the stress ratio and slenderness ratio induced linear increases in wall closure and damage depth,whereas increasing the foliation angle first increases the deformation and damage depth and then reduces them both before and after 45.The wall closure and damage thickness decreased with increasing orientation *** deformation and damage levels were classified based on these factors.

关键词： Large anisotropic deformation Buckling Deep mining slenderness ratio Intercept angle Foliation orientation

Seismic behavior of batter pile groups embedded in liquefiable soil

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Earthquake Engineering and Engineering Vibration 2021年第3期20卷 583-604页

作者： J.S.Rajeswari Rajib Sarkar Department of Civil Engineering Indian Institute of Technology(ISM)DhanbadDhanbad 826004India

A comparative study of the seismic performance of 2×1 pile groups considering different degrees of batter(0°for vertical,10°and 20°)embedded in single homogeneous liquefiable sand through fully coupled three-dimensional dynamic analyses is *** effects of inertial interaction are considered with structures having two different *** performance of pile groups is investigated for the fixed and pinned pile to cap connections for both floating and end bearing types of pile *** ratios of piles were also varied to enable a comprehensive *** have been carried out for three earthquake motions having varied dominant *** is observed that batter pile groups in liquefiable soils provide beneficial effects on piles and superstructure responses for both fixed and pinned head pile to cap connections for long period ***,for short period structures,a beneficial effect is most evident for fixed head connection.

关键词： batter pile liquefaction period of structure pile to cap connection slenderness ratio

Experimental study on slender reinforced concrete columns wrapped with CFRP

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Global Geology 2009年第4期12卷 226-229页

作者： HU Zhongjun NIE Lei PAN Jinglong XU Tian College of Construction Engineering Jilin University Changchun 130026 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

By axial compression tests on 6 reinforced concrete slender columns wrapped with carbon fiber-reinforced plastic (CFRP),with slenderness ratio(SR) from 4.5 to 17.5,the results show that when SR increases the retrofitting effect declines. In the case of same SR,the stability coefficient (SC) for the reinforced concrete(RC) columns with CFRP is much less than that without CFRP. There is 20% increase of stable bearing capacity to the former as compared with the latter when the SR in less than 17.5. The study summarized the simplified formula for SC,which provides a reference for engineering designers.

关键词： carbon fiber reinforced plastics reinforced concrete column stability coefficient slenderness ratio