• Title, Summary, Keyword: flat plate system

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Ductility of Column-Slab eoint in R/C Flat Plate System (플랫 플레이트 구조의 기둥.슬래브 접합부 연성에 관한 연구)

  • 김형기;박복만
    • Journal of the Korea Concrete Institute
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    • v.12 no.4
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    • pp.113-119
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    • 2000
  • The R/C flat plate system provides architectural flexibility, clear space, reduced building height, simple formwork, which consequently enhance constructibility. One of the serious problems in the flat plate system is brittle punching shear failure due to transfer of shear force and unbalanced moments in column-slab joint. Recently, the flat plate system accompanied with shear walls to resist the lateral loads is applied to high-rise buidings. Although the flat plate system is not considered in design as part of the lateral load-resisting system, it is required that this system keeps the ductile behavior for the lateral displacement of the building. However, it is unclear whether the column-slab joint possesses ductility enough to survive the lateral deformation. The objective of this paper is to investigate the major parameters that influence the ductility of R/C flat plate system by examining the existing experiments on column-slab joint. The effects of gravity load and shear reinforcement on the ductility of the flat plate system are presented.

Analysis of Seismic Performance of Slim Flat Plate System in High-rise Hybrid Structural System (슬림형 바닥시스템을 이용한 고층 복합구조의 내진성능에 관한 해석적 연구)

  • Ha Gee Joo;Park Hyo Sun;Park Joung Hyen;Choi Kyung Ryeol;Kim Dae Joung;Jung Jea Kwang
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.77-80
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    • 2005
  • Recently the construction of high-rise hybrid type building is progressively increased as the social demands. It is significantly important factors such as economy, the safety of structure, and the flexibility of internal space. Therefore new hybrid structural system, using slim flat plate system, is also required to be attained the reduction of story height, the flexibility and efficient use of space. The most suitable structural system is ,with the economy and flexibility, flat plate system in high-rise hybrid type building. But it was focused in the seismic performance for high performance flat plate system in high-rise hybrid type building. Therefore, in the study, to develop the new flat-plate system with high ductile, durable, good performance for the applications. It was evaluated the seismic performance in the critical region of slab-column connection. And then high performance flat plate system, designed by the economy and safety, was developed as a new technique in the application of high-rise hybrid type building.

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Development for Connection Details between Flat Plate Slab and H-Steel Column (무량판 슬래브와 H형강 기둥 접합부 상세 개발)

  • Yoon, Myung-Ho;Lee, Yoon-Hee
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.5 no.1
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    • pp.22-27
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    • 2014
  • The flat plate slab system have many good features, which are design flexibilities, saving of story-height and economy of construction etc. But the study of flat plate slab system for H-steel column have been rare both at home and abroad. Recently high-rise residential and commercial buildings have been constructed in urban areas in Korea. The suggested dowel connection system is more likely to adoptable because it remarkably contribute to save inter story height and also to have many advantages compared with conventional steel works such as H-Steel frame + Deck plate slab system. This study aims at developing design method and program for connection between H-Steel column and flat plate slab system, which contribute to save significantly inter-story height.

An Experimental Study on Comparison of Structural Behavior of PT Flat Plate and RC Flat Plate Interior Connections (PT 플랫 플레이트와 RC 플랫 플레이트 내부 접합부의 구조적 거동 비교에 관한 실험적 연구)

  • Lee Dong Keun;Ha Sang-Su;Han Sang Whan;Lee Li Ryung
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.111-114
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    • 2005
  • While the existing reinforced concrete flat plate(RC flat plate) has a lot of advantages including reduced building height, it has some weak points such as many steel bars and the brittle rupture by punching shear. Compared with the RC flat plate, the post-tensioned flat plate (PT flat plate) has not only the same merits, but it also makes longer span possible and induces slab-column connections to be failed with the ductile behavior rather than with the brittle behavior by means of post-tensioning. However, it is difficult to define the joint behavior of PT flat plate under vertical and lateral loads since there are limit experimental results. For this reason, the experimental study is undertaken to investigate the comparison of behavior of PT flat plate and RC flat plate, and how flat plate(Gravity Load Resisting System) is displaced as lateral loads, like the wind and the earthquake, are occur. The result of this experiment shows that PT flat plate is generally superior to RC flat plate in terms of controlling crack, postponing stiffness deterioration, energy dissipation, etc.

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Unified equivalent frame method for post-tensioned flat plate slab structures

  • Choi, Seung-Ho;Lee, Deuck Hang;Oh, Jae-Yuel;Kim, Kang Su;Lee, Jae-Yeon;Lee, Kang Seok
    • Computers and Concrete
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    • v.20 no.6
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    • pp.663-670
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    • 2017
  • The post-tensioned (PT) flat plate slab system is commonly used in practice, and this simple and fast construction method is also considered to be a very efficient method because it can provide excellent deflection and crack control performance under a service load condition and consequently can be advantageous when applying to long-span structures. However, a detailed design guideline for evaluating the lateral behavior of the PT flat plate slab system is not available in current design codes. Thus, typical design methods used for conventional reinforced concrete (RC) flat plate slab structures have inevitably been adopted in practice for the lateral load design of PT flat plate structures. In the authors' previous studies, the unified equivalent frame method (UEFM) was proposed, which considers the combined effect of gravity and lateral loads for the lateral behavior analysis of RC flat plate slab structures. The aim of this study is to extend the concept of the UEFM to the lateral analysis of PT flat plate slab structures. In addition, the stiffness reduction factors of torsional members on interior and exterior equivalent frames were newly introduced considering the effect of post-tensioning. Test results of various PT flat plate slab-column connection specimens were collected from literature, and compared to the analysis results estimated by the extended UEFM.

Reshoring effects on deflections of multi-shored flat plate systems under construction

  • Kang, Su-Min;Eom, Tae-Sung;Kim, Jae-Yo
    • Structural Engineering and Mechanics
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    • v.45 no.4
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    • pp.455-470
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    • 2013
  • RC flat plates that have no flexural stiffness by boundary beams may be governed by a serviceability as well as a strength condition. A construction sequence and its impact on the distributions of construction loads among slabs tied by shores are decisive factors influencing immediate and long term performances of flat plate. Over-loading and tensile cracking in early-aged slabs significantly increase the deflection of a flat plate system under construction. A reshoring work may be helpful in reducing slab deflections by controlling the vertical distributions of construction loads in a multi-shored flat plate system. In this study, a change of construction loads by reshoring works and its effects on deflections of flat plate systems under construction are analyzed. The slab construction loads with various reshoring schemes are defined by a simplified method, and the practical calculation of slab deflections with considering construction sequences and concrete cracking effects is applied. From parametric studies, the reshoring works are verified to reduce construction loads and slab deflections.

Structural Behavior of Post-Tensioned Flat Plate Slab-Column Connections (포스트 텐션 플랫 플레이트 슬래브 접합부의 거동)

  • Cho Kyung Hyun;Han Sang Whan;Lee Li-Hyung
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.53-56
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    • 2004
  • Recently, post tension flat plate slab system is widely used for a new slab structural system. Slab-column connections may fail in brittle manner by punching shear. Flat plate slabs have been widely used for gravity load resisting system in buildings. Lateral resistance usually provided by shear walls or moment resisting frames. Since plat plates move together with lateral loading system during earthquake or wind, it is important to evaluate the gravity resistance under a drift experienced by lateral force resisting system during either design earthquake or wind. Thus, this study investigated post tension flat plate slab systems whether they have sufficient strength and deformability to resist gravity loads during specified drift levels. Experimental research was carried out.

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Research on Effective Use of Radiation for Flat plate Type Collector (평판형 집열기에서 일사성분의 유효성에 관한 연구)

  • Choi, Sung-Woo;Chung, Sung-Sik;Ha, Jong-Yul;Kawasima, Yousuke
    • Proceedings of the KSME Conference
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    • pp.2135-2140
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    • 2004
  • This study represented experimental research on the flat plate solar collector. For the flat plate Solar system, it is sensitive of the Global radiation. In Actually, it suppose to be dependent on the direct radiation. Also, the existing method's factors are depend upon Global radiation in the flat plate collector system. therefore it needs which is depend upon direct radiation. In this experiment, the flat plate collector is used for obtaining the method's factors of the direct radiation. As a result, the correct $({\tau}{\alpha})_e$ is found out for practical value.

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An Experimental Study on the Solar Collector Efficiency for Apartment Building (공동주택의 태양열 집열기 효율에 대한 실험적 연구)

  • Choi, Byungdo;Kim, Miyeon
    • 한국신재생에너지학회:학술대회논문집
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    • pp.130.2-130.2
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    • 2011
  • The application of solar energy in residential building is general and natural in today. And application methods of solar thermal energy is divided in two kind of form, single evacuated tube and flat-plate form. Then in this study, the efficiency of single evacuated tube and flat-plate system is compared by total and effective area considering the time receiving the solar radiation between 24 hours and the specific time(10:00~15:00). As a result of the experiment, single evacuated tube and flat-plate collector's efficiency is varied by the quantity of solar radiation. And especially, the flat-plate system is more affected by outdoor temperature. Therefore the application of solar thermal system should be considered the solar radiation and outdoor temperature.

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Heat Transfer Augmentation on Flat Plate with Two- Dimensional Rods in Impinging Air Jet System (1) : Effect of Clearance between flat plate and rod (충돌판(衝突板) 근방(近傍)에 배열(配列)된 2차원(次元) rod가 충돌분류(衝突噴流) 열전달(熱傳達)에 미치는 영향(影響) (1) : 전열면(傳熱面)-rod간(間)의 간극효과(間隙效果))

  • Lee, Yong Hwa;Seo, Jeong Yun
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.1 no.1
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    • pp.73-81
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    • 1989
  • The purpose of this study is augmentation of heat transfer without additional power in a rectangular impinging air jet. As a method of passive heat transfer augmentation in a two-dimensional air jet, heat transfer surface of flat plate with rods is used. This study, particularly in the wall jet rigeon, investigates the effect of the clearance between the flat plate and rod. Mechanism of heat transfer enhancement is investigated by measuring the local heat transfer coefficient. It is concluded that the superposition of the effects of flow accelerlation through the clearance between the flat plate and the rod, and reattachment of the flow was the cause of the excellent performance. The overall heat transfer rate of flat plate with rods is about 1.5 times larger than that of flat plate without rods.

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