• Title/Summary/Keyword: high rise buildings

Search Result 1,539, Processing Time 0.029 seconds

Seismic Performance Assessment of High-Rise Building installed with Multiple Active Tuned Mass Dampers (다중 능동형 동조질량감쇠기가 설치된 고층빌딩의 내진성능 평가)

  • Park, Kwan-Soon;Ok, Seung-Yong
    • Journal of the Korean Society of Safety
    • /
    • v.32 no.6
    • /
    • pp.89-97
    • /
    • 2017
  • The tuned mass damper (TMD) system was first proposed as an efficient vibration control method for high-rise buildings, and multiple TMD (MTMD) system was then proposed for the purpose of improving the robust performance. Thereafter, the active TMD (ATMD) is proposed to improve the vibration control performance over the TMD and MTMD systems. However, this system may experience an system-instability problem in case of the actuator malfunction. In order to overcome such limitations of actuator malfunction causing the instability of the structural system, in this study, we investigate the feasibility of the multiple ATMD (MATMD) system that facilitates both advantages of the MTMD and ATMD. Numerical example demonstrates that, when the proposed system is designed to have the same capacity as the ATMD, it shows a similar control performance to the ATMD, but also has very good adaptive control performance against the emergency situations such as actuator failures.

Automatic Arrangement Algorithm for Tower Cranes Used in High-rise Apartment Buildings

  • Lim, Chae-Yeon;Kim, Sun-Kuk;Seo, Deok-Seok;Son, Ki-Young
    • Journal of the Korea Institute of Building Construction
    • /
    • v.12 no.3
    • /
    • pp.358-368
    • /
    • 2012
  • On most construction sites, the arrangement of tower cranes is decided by site engineers based on their own experience, which can cause cost overruns and delays in the lifting work. Although many researchers have conducted studies on tower crane arrangement using computer modeling and knowledge-based expert systems as well as mathematical models, no research has aimed to develop an algorithm to identify an optimum solution among several alternatives for installation areas of tower cranes satisfying the conditions of lifting work. The objective of this study is to develop an automatic arrangement algorithm for tower cranes used in high-rise apartment construction. First, as a new concept, a possible installation area of tower cranes was suggested. Second, after proposing several alternatives based on the installation points suggested in this study, an algorithm analyzing the economic feasibility of tower cranes was developed considering the rental, installation and removal costs. Third, a case study was conducted to prove the validity of the developed algorithm for selecting and installing an effective set of tower cranes at minimum cost.

Development of Analysis Method for Long-Term Behavior of a High-Rise Building (초고층 건축물의 장기거동 해석기법 개발)

  • Seol, Hyun-Cheol
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2010.05a
    • /
    • pp.485-486
    • /
    • 2010
  • In this research, a new analysis method which is able to examine the safety and to assess the serviceability of high-rise buildings from construction period to service life has been developed. The effect of both construction sequence and inelastic behavior of concrete has been considered in the developed analysis method in three dimensions. The more efficient analysis technique and modeling method for practical use were also suggested. For verification of the developed analysis method, the data measured in a high-rise building under construction was compared with the analysis results. Through comparison of the analysis results with the measured data, it was found that the analysis results generally simulated the trend of the measured data well in all cases.

  • PDF

Advances in the design of high-rise structures by the wind tunnel procedure: Conceptual framework

  • Simiu, Emil;Yeo, DongHun
    • Wind and Structures
    • /
    • v.21 no.5
    • /
    • pp.489-503
    • /
    • 2015
  • This paper surveys and complements contributions by the National Institute of Standards and Technology to techniques ensuring that the wind tunnel procedure for the design of high-rise structures is based on sound methods and allows unambiguous inter-laboratory comparisons. Developments that enabled substantial advances in these techniques include: Instrumentation for simultaneously measuring pressures at multiple taps; time-domain analysis methods for estimating directional dynamic effects; creation of large simulated extreme directional wind speed data sets; non-parametric methods for estimating mean recurrence intervals (MRIs) of Demand-to-Capacity Indexes (DCIs); and member sizing based on peak DCIs with specified MRIs. To implement these advances changes are needed in the traditional division of tasks between wind and structural engineers. Wind engineers should provide large sets of directional wind speeds, pressure coefficient time series, and estimates of uncertainties in wind speeds and pressure coefficients. Structural engineers should perform the dynamic analyses, estimates of MRIs of wind effects, sensitivity studies, and iterative sizing of structural members. The procedure is transparent, eliminates guesswork inherent in frequency domain methods and due to the lack of pressure measurements, and enables structural engineers to be in full control of the structural design for wind.

New GPU computing algorithm for wind load uncertainty analysis on high-rise systems

  • Wei, Cui;Luca, Caracoglia
    • Wind and Structures
    • /
    • v.21 no.5
    • /
    • pp.461-487
    • /
    • 2015
  • In recent years, the Graphics Processing Unit (GPU) has become a competitive computing technology in comparison with the standard Central Processing Unit (CPU) technology due to reduced unit cost, energy and computing time. This paper describes the derivation and implementation of GPU-based algorithms for the analysis of wind loading uncertainty on high-rise systems, in line with the research field of probability-based wind engineering. The study begins by presenting an application of the GPU technology to basic linear algebra problems to demonstrate advantages and limitations. Subsequently, Monte-Carlo integration and synthetic generation of wind turbulence are examined. Finally, the GPU architecture is used for the dynamic analysis of three high-rise structural systems under uncertain wind loads. In the first example the fragility analysis of a single degree-of-freedom structure is illustrated. Since fragility analysis employs sampling-based Monte Carlo simulation, it is feasible to distribute the evaluation of different random parameters among different GPU threads and to compute the results in parallel. In the second case the fragility analysis is carried out on a continuum structure, i.e., a tall building, in which double integration is required to evaluate the generalized turbulent wind load and the dynamic response in the frequency domain. The third example examines the computation of the generalized coupled wind load and response on a tall building in both along-wind and cross-wind directions. It is concluded that the GPU can perform computational tasks on average 10 times faster than the CPU.

Attitude Differences on Common Space Management between Expecting Residents and Residents in High Rise Mixed-use Residential Building (초고층 주상복합 건물 거주자와 입주예정자의 공유공간 관리에 대한 태도 비교)

  • 홍형옥;채혜원
    • Journal of Families and Better Life
    • /
    • v.22 no.5
    • /
    • pp.123-132
    • /
    • 2004
  • The purpose of this study was testing the attitude differences on common space management between expecting residents and residents in high rise mixed-use residential buildings(MURB). Research method was social survey with questionnaire from 176 residents and 67 expecting residents by snow balling sampling. Research results were 1)residents want mostly 'convenience', but expecting residents want mostly 'amenity' from MURB environment 2)residents and expecting residents showed statistically significant attitude differences on willingly to pay, amount to pay and paying method about common spaces & facilities. 3)above two groups showed statistically significant difference on opening the common spaces & facilities to the community. 4)residents showed higher than expecting residents on impact degree of common spaces & facilities to neighborhood intimacy. 5)most of residents and expecting residents had an idea of 1-2 hour per week volunteer service at common spaces & facilities. Conclusively, survey on expecting residents's opinion might be needed to enhance the usability of common spaces and facilities in MURB. After the residents moving in, periodical evaluation about usability of each spaces & facilities needed to remodel common spaces.

The effect of base isolation and tuned mass dampers on the seismic response of RC high-rise buildings considering soil-structure interaction

  • Kontoni, Denise-Penelope N.;Farghaly, Ahmed Abdelraheem
    • Earthquakes and Structures
    • /
    • v.17 no.4
    • /
    • pp.425-434
    • /
    • 2019
  • The most effective passive vibration control and seismic resistance options in a reinforced concrete (RC) high-rise building (HRB) are the base isolation and the tuned mass damper (TMD) system. Many options, which may be suitable or not for different soil types, with different types of bearing systems, like rubber isolator, friction pendulum isolator and tension/compression isolator, are investigated to resist the base straining actions under five different earthquakes. TMD resists the seismic response, as a control system, by reducing top displacement or the total movement of the structure. Base isolation and TMDs work under seismic load in a different way, so the combination between base isolation and TMDs will reduce the harmful effect of the earthquakes in an effective and systematic way. In this paper, a comprehensive study of the combination of TMDs with three different base-isolator types for three different soil types and under five different earthquakes is conducted. The seismic response results under five different earthquakes of the studied nine RC HRB models (depicted by the top displacement, base shear force and base bending moment) are compared to show the most suitable hybrid passive vibration control system for three different soil types.

Analysis on Constructability Information and Design Elements by Construction Engineering Task at the Design Phase - Concentrated on Temporary Work in High-rise Building Projects - (설계단계 시공엔지니어링 업무별 주요 시공성 정보 및 설계요인 분석 - 고층 건축 프로젝트의 가설공사를 중심으로 -)

  • Lee, Jin Woong;Kim, Taehoon;Cho, Kyuman
    • Journal of the Regional Association of Architectural Institute of Korea
    • /
    • v.20 no.6
    • /
    • pp.97-104
    • /
    • 2018
  • Recently, as the shape and function of high-rise buildings have become more complex, engineering for reflecting the constructability in the design phase has the increasing importance. However, engineering tasks are not performed at the appropriate level and timing in most projects, which leads to inefficient work such as design changes and reworks. Hence, this study investigated the constructability knowledge, design elements, and supporting tools required to conduct engineering tasks related to temporary work at the design phase, and also analyzed the relationship between these factors using the correlation analysis. As a result, when the engineering tasks are applied in the design phase, constructability knowledge related to 'construction method and process' is the most important and the design factor related to 'layout/arrangement' should be considered as the most important factor. Based on the results of this study, the project participants can efficiently use necessary constructability knowledge during the design phase and facilitate effective decision-making and design alternatives for enhancing constructability.

Modern Skyscrapers in the Late 19th Century

  • Peet, Gerard
    • International Journal of High-Rise Buildings
    • /
    • v.9 no.1
    • /
    • pp.43-51
    • /
    • 2020
  • Skyscrapers are often seen as a typically American phenomenon. This paper aims at demonstrating that in terms oif technology major developments are European and that, albeit in lesser number and not as high as in the USA, skyscrapers were also built in the late 19th century in countrries other than the USA. The paper concludes with an overview of late 19th century non-US skyscrapers.

Distribution of Heat and Smoke Related to Openings in Hise-Rise Apartment Building Fires (고층 공동주택의 개구특성에 따른 화재시 열.연기유동에 관한 연구)

  • 이지희
    • Fire Science and Engineering
    • /
    • v.15 no.2
    • /
    • pp.59-79
    • /
    • 2001
  • The paper proposes alternatives for fire safety in architectural planning through heat-smoke distribution related to openings so that we decrease casualty and property loss by fire and lay a great emphasis on building high-rise apartments with consideration of fire safety in Korea. An analysis program(HFA-Heat Fluid Analysis) is built to perform simultaneously numerical analysis and experimental analysis on rooms, units and buildings. In consequence, on the first, fire prevention methods are required to be set up related to openings for design rooms since the flow of heat and smoke is influenced by the type of openings in high-rise apartments. Second, the numerical analysis showed that different planning types cause to show differences in the spreading time of heat and smoke to design the units of high-rise apartments. On the third, each unit building showed different fire behavior depending on openings by numerical analysis and small scaled experiment on heat and smoke flow.

  • PDF