• Title, Summary, Keyword: Mat Foundation

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A Study on the Selection Method of Foundation Type in the Underground Parking Lot of Apartments (공동주택 지하 주차장 기초형식 선정방법에 관한 연구)

  • Im, Nam-Gi;Lee, Yeong-Do;Bae, Yong-Hwan
    • Journal of the Korea Institute of Building Construction
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    • v.4 no.3
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    • pp.109-116
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    • 2004
  • Normally easy task of plat in urban architecture is that using underground full of activities for increase building site efficiency. Especially for using underground space for the parking lot. Also utilize underground is more increase for fulfill requirement in modern society considered with environmental friendly architecture. The primary objective of this study is to apply analyzed formal foundation type for selecting the optimum type of parking lots considered with structural stability, economical efficiency, construction efficiency, construction duration. This study aim to on criteria decided through the questionaries for the selection considered with in the scale of second stories parking lots underground, parking volume is 80 and reinforced concrete structure. The bearing capacity is 6~8m and downward from surface, healthy ground bearing capacity is 40 t/m2. This study comparative analysis and discuss economical efficiency, construction efficiency, construction duration based constructivist stability which applied Single foundation, Mat foundation, Drop Mat foundation. The result of this study is as follows: First, the result of economical efficiency is that on the basis of single foundation, Drop Mat foundation is 1.88, Mat foundation 2.04 as a comparative analysis on the basis of total construction cost included material cost, labor coast and machinery cost. Second, the result of construction efficiency order is single foundation, Drop Mat foundation, Mat foundation as a comparative analysis on the based connected characteristics. Third, the result of construction duration is that on the basis of Mat Foundation, Drop Mat foundation is 1.33, single foundation is 1.87 as a comparative analysis Critical Path. Forth, Each foundational type characteristics order through the matrix method is that overall each formal type of foundation contraries at economical efficiency and construction efficiency, construction duration. Also expect contradiction between engineers and owners due to engineer pursuit construction duration and ewer to begin with economical efficiency. Fifth, The selection of suitable foundation formal type needs that based consider project characteristic and field condition as according to above result of a comparative analysis. As a result, a comparative analysis economical efficiency, construction efficiency, construction duration of Mat foundation, Drop Mat foundation, single foundation with 3Bay reinforced structure underground parking lots on the healthy ground.

Variability of subgrade reaction modulus on flexible mat foundation

  • Jeong, Sangseom;Park, Jongjeon;Hong, Moonhyun;Lee, Jaehwan
    • Geomechanics and Engineering
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    • v.13 no.5
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    • pp.757-774
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    • 2017
  • The subgrade reaction modulus of a large mat foundation was investigated by using a numerical analysis and a field case study. The emphasis was on quantifying the appropriate method for determining the subgrade reaction modulus for the design of a flexible mat foundation. A series of 3D non-linear FE analyses are conducted with special attention given to the subgrade reaction modulus under various conditions, such as the mat width, mat shape, mat thickness, and soil condition. It is shown that the distribution of the subgrade reaction modulus is non-uniform and that the modulus of subgrade reaction at both the corners and edges should be stiffer than that at the center. Based on the results obtained, a simple modification factor for the subgrade reaction modulus is proposed depending on the relative positions within the foundation in weathered soil and rocks.

A Study on the Effect of the Construction Conditions on a Thermal Crack of Mat Foundation (매트기초의 온도균열에 미치는 시공조건의 영향에 관한 연구)

  • 이도범;김효락;최일호
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.1-4
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    • 2003
  • Recently, a structure has been larger and higher under the improvement of construction technique. So, a mass concrete constructions that a mat foundation thickness of structure is over 80cm have been many. Also, because of the reason of high strength of concrete, the matter of thermal crack have become an important task to be solved absolutely. tn a cause of a thermal crack occurrence, there are material used, mixture of concrete, construction condition and so forth. In this study, we executed temperature and stress analysis of mat foundation to know the effect of the construction condition on a thermal crack of mat foundation. And we evaluated quantitatively about the occurrence possibility of thermal crack using the hydration heat analysis program. By using of this analysis technique, we will can control skilfully the quality of a mat foundation in advance.

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Analysis of the Effect of Solar Radiation on Internal Temperature Distribution in Concrete Mat Foundation (태양 복사열이 콘크리트 매트기초의 내부 온도분포에 미치는 영향에 관한 해석적 연구)

  • Song, Chung Hyun;Lee, Chang Joo
    • Journal of the Korea Institute of Building Construction
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    • v.17 no.1
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    • pp.63-72
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    • 2017
  • This research investigated the effect of solar radiation on the temperature distribution in concrete mat foundation. Zhang and Huang Model was utilized to estimate solar radiation heat at a given date and time. A one-dimensional finite element formula was derived with the fundamental laws of heat transfer and Galerkin method. Based on the formula, a one dimensional finite element analysis code was developed using MATLAB. Hydration heat analysis of mat foundation were conducted using the developed code. It was found that the solar radiation reduced the maximum temperature difference in mat foundation, and this temperature difference reduction was more prominent in case of summer season cast, a higher initial concrete temperature, and a thicker mat foundation depth. The research recommended that the solar radiation should be considered in hydration heat analysis of concrete mat foundation so as not to overestimate the maximum temperature difference in mat foundation.

ANALYSIS AND DESIGN OF MAT FOUNDATION FOR HIGH-RISE BUILDINGS (초고층 건물의 전면기초(MAT기초) 해석 및 설계)

  • Hong, Won-Gi;Hwang, Dae-Jin;Gwon, Jang-Hyeok
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.94-110
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    • 1994
  • Types of foundation of high rise buildings are primarily determined by loads transmitted from super structure, soil bearing capacity and available construction technology. The usd of deep foundation cannot be justified due to the fact that rock of enough bearing capacity is not found down until 90 ~ 100m. When a concentration of high soil pressure must be distributed over the entire building area, when small soft soil areas must be bridged, and when compressible strata are located at a shallow depth, mat foundation may be useful in order to have settlement and differential settlement of variable soils be minimized. The concept of mat foundation will also demonstrate some difficulities of applications if the load bearing demand directly carried down to the load -bearing strata exceeds the load -bearing capacity. This paper introduces both the analysis and design of mat type foundation for high rise buildings as well as the methodology of modelling of the soil foundation, especially, engineered to redistribute the stress exceeding the soil bearing capadity. This process will result in the wid spread of stresses over the entire building foundation.

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Laboratory Test of Piled-Raft Foundation Improved by Gravel Mat (Gravel Mat로 보강된 말뚝지지 전면기초의 실내모형실험)

  • Seo, Young-Kyo;Lee, Jeong-Hoon
    • Journal of Ocean Engineering and Technology
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    • v.25 no.2
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    • pp.47-54
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    • 2011
  • A piled raft foundation is one of the systems used to reduce the settlement of structures. However, the general design method for a piled raft foundation system assumes that the piles only support external loads, which exclude the bearing capacity of the raft itself. In this study, an experimental model test was performed to evaluate the raft capacity for the external load on the sand. Additionally, a part of the sandy ground under the raft was replaced with a gravel mat to reinforce the piled raft foundation system and increase the bearing capacity. Then, parametric studies of the reinforced ground were performed to determine the displacement and load-sharing ratio of the piled raft foundation system.

Mat Foundation Analysis Using Variable Node Plate Bending Element (변절점 굉판휨요소를 이용한 전면기초의 해석)

  • 최창근;김한수
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • pp.7-12
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    • 1992
  • The variable node plate bending element, ie, the element with one or two additional mid-side nodes is used in the analysis of mat foundation to generate the nearly ideal grid model in which more nodes are defined near the column location. The plate bending element used in this study is the one based on Mindlin/Reissner plate theory with substitute shear strain field and the nodal stresses of that element are obtained by the local smoothing technique. The interaction of the soil material with the mat foundation is modeled with Winkler springs connected to the nodal points in the mat model. The vertical stiffness of the soil material are represented in terms of a modulus of subgrade reaction and are computed in the same way as to the computation of consistent nodal force of uniform surface loading. Several mesh schemes were proposed and tested to find the most suitable scheme for mat foundation analysis.

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Analysis and Design of Mat Foundation for High -Ribe Buildings (초고층 건물의 전면기초(MAT 기초) 해석 및 설계)

  • Hong, Won-Gi;Hwang, Dae-Jin;Gwon, Jang-Hyeok
    • Geotechnical Engineering
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    • v.11 no.2
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    • pp.51-70
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    • 1995
  • Types of foundation of high rise buildings are primarily determined by loads transmitted from super structure, soil bearing capacity and available construction technology, The use of deep foundation of the buildings considered in this study due to the fact that rock of enough bearing capacity is not found down until 90~l00m. When a concentration of high soil pressure must be distributed over the entire building area, when small soft soil areas must be bridged, and when compressible strata are located at a shallow depth, mat foundation may be useful in order to have settlement and differential settlement of variable soils be minimized. The concept of mat foundation will also demonstrate some difficulties of applications if the load bearing demand directly carried down to the load -bearing strata exceeds the load -bearing capacity. This paper introduces both the analysis and design of mat type foundation for high rise buildings as well as the method-ology of modelling of the soil foundation, especially, engineered to redistribute the stress exceeding the soil bearing capacity. This process will result in the wide spread of stresses over the entire building foundation.

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The Case Studies on Application of Mat Foundation System to Building Structure Founded on Weathered Ground (풍화대지반에 지지된 건축구조물의 전면기초 적용에 관한 사례 연구)

  • Choi, Yongkyu;Kim, Sungho;Lee, Minhee
    • Journal of the Korean Geoenvironmental Society
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    • v.10 no.6
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    • pp.5-18
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    • 2009
  • In construction of buildings in Korea, the buildings are frequently founded on the weathered ground (weathered soil/rock, fractured rock). In this case, to make a full use of a bearing capacity of a weathered ground for economic design, the shallow mat foundation system could be used. In this study, we have researched three cases of mat foundations on the weathered ground in Korea, and analyzed and considered the design procedures and the reinforcing methods. That is, we have considered the detail design, analysis proceedings, the ground settlement evaluation proceedings, the rock face mapping evaluations after excavation and reinforcing methods of the mat foundation on the weathered ground. And large scale plate load tests on the weathered ground supporting the mat foundation were performed and also load bearing capacity and settlement of actual mat foundation, considering the scale effect, were evaluated.

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A Study on the Control of Thermal Crack of the Mat Foundation (매트기초의 온도균열 제어에 관한 연구)

  • 이도범;김효락;박지훈;최일호
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.305-308
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    • 2003
  • Recently, a structure has been large and high under the improvement of construction technique. So, mass concrete constructions that a mat foundation thickness of structure is over 80cm have been many. Also, in the reason of high strength of concrete, a matter of thermal crack became an important task to be solved. In this study, we executed temperature and stress analysis of mat foundation. And we evaluated quantitatively about the possibility of thermal crack by using hydration heat analysis program. Because of this analysis technique, we could control skilfully the quality of mat foundation in a construction.

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