• Title/Summary/Keyword: high rise buildings

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Research on non-welding door frame assembly method that allows on-site assembly (현장조립이 가능한 무용접 도어프레임 조립방식에 대한 연구)

  • Lee, Joo-Won;Lim, Bo-Hyeok;Lee, Gwang-Woo;Lee, Hae-Yeol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.155-156
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    • 2023
  • In the case of steel door frames commonly found in general buildings, there are various assembly methods such as rivets, bolts, and welding, but the welding method is generally used. However, this welding joint method has many problems, such as distortion due to heat and damage due to external shock. In particular, when used as a fire door, problems may occur in the event of a fire due to distortion caused by heat from welding and the weak welded joint area. In the case of rivet or welded joints, when moved after assembly, joint loosening due to external shock may occur. Problems may arise where the bonding strength becomes weak. In addition, with the recent increase in high-rise buildings and larger buildings, when assembly is completed and brought to the site, a place is needed to store it, and in addition, there is a problem in that it has to be transported several times in small quantities to the installation site, which is another problem of time and cost loss. This is coming to the fore. In order to fundamentally solve this problem, we have researched and developed a non-welding door frame that can be assembled on site. We have researched and developed three assembly methods: screw-type, insert-type, and protrusion-type. Non-welded door frames are small in size and easy to package, making them advantageous for domestic and overseas exports.

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Correlation of Experimental ana Analytical Inelastic Responses of 1:12 Scale Irregular High-Rise RC Buildings (1:12축소 비정형 고층 RC 건물의 비선형거동에 대한 실험과 해석의 상관성)

  • Ko, Dong-Woo;Lee, Han-Seon
    • Journal of the Earthquake Engineering Society of Korea
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    • v.11 no.2 s.54
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    • pp.95-104
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    • 2007
  • Three types of high-rise RC building structures having irregularity in the lower two stories were selected as prototypes and were performed nonlinear static analysis by using OpenSees to verify the analysis technique and to investigate the seismic capacity of those buildings. The first one has a symmetrical moment resisting frame (Model 1), the second has an infilled shear wall in the central frame (Model 2), and the third has an infilled shear wall only in one of exterior frames (Model 3). Fiber model, which consists of concrete and reinforcing bar represented from stress-strain relationship, is adapted used for simulate the nonlinearity of members, and MVLEM(Multi vertical linear element model) is used for simulate the behavior of wall. The analytical results are simulate the behavior of piloti stories well, for example, the stiffness and yield farce of piloti stories, the up-lift of wall and the variation of lateral stiffness of column due to the variation of axial forces. Overstrength of Model 2 and Model 3 are about 2 times larger than that of Model 1. The reason of the high oversttrength and ductility of Model 2 and Model 3 is that the conservative design of Model 2 and Model 3, whose beam and column sections are the same as those of Model 1. The ductilities of Model 1 and Model 3 are slightly larger than that of Model 1 and Model 3. Model 1 and Model 3 reached mechanism condition, whereas Model 2 failed to the shear failure of shear wall and the large axial forces in columns due to large overturning moment.

Fire-fighting Pump Approval Standard for Fire-fighting Trucks with an Additional Positive Displacement Pump (용적형 펌프를 추가한 소방자동차용 소방펌프의 성능 인정기준에 관한 연구)

  • Han, Yong-Taek;Sung, Ki-Chan;Min, Se-Hong
    • Fire Science and Engineering
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    • v.30 no.1
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    • pp.104-110
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    • 2016
  • Positive displacement pumps with high pressure and water capacity are used large fires in various high-rise buildings. This study provides information for a performance approval standard of fire pumps for fire trucks based on centrifugal pump standards enacted in 2012. An experiment was conducted with a positive displacement pump for three levels of performance from the approval standard (V-1, 2, and 3). The efficiency of the pump was included in the reference, which requires the approval of 65% performance, the same as a centrifugal pump. The water pressure is between 1.5 and 2.5 MPa, and the required flow rate was established as at least $0.31m^3/min$ and up to $3.0m^3/min$. A relief valve was added to adjust the shut-off pressure due to the structural characteristics of the positive displacement pump. A strainer was also installed to prevent damage to the inside of the pump due to foreign matter. However, the strainer includes a difference from the positive displacement pump to operate without a vacuum pump and the centrifugal pump. This is due to the additional approval standard portion of the positive displacement pump, which is expected to be selected for more variety of fire-fighting equipment and proactive responses to fire suppression in a high-rise buildings and large fires. In conclusion, this approval standard was enacted in January 2016.

A Study of the Structural Vibration Control Using a Biaxial Tuned Mass Damper (2축 동조 질량 감쇠기를 이용한 구조물의 진동 제어 연구)

  • 정태영
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2000.10a
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    • pp.473-481
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    • 2000
  • Civil structures are becoming more flexible and lightly damped. When subjected to dynamic loads such as wind, earthquake and wave, vibration may be easily induced and lasted for lond duration. To suppress the wind-induced and earthquake-induced vibration of high-rise buildings, study on the development of a tuned mass damper has been carried out. Based on optimal design on passive tuned mass damper which is considered for a building subject to random excitations, a biaxial tuned mass damper was designed and developed. It is confirmed that the vibration levels of the test structure are reduced using the developed tuned mass damper.

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Wind tunnel modeling of roof pressure and turbulence effects on the TTU test building

  • Bienkiewicz, Bogusz;Ham, Hee J.
    • Wind and Structures
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    • v.6 no.2
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    • pp.91-106
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    • 2003
  • The paper presents the results of 1:50 geometrical scale laboratory modeling of wind-induced point pressure on the roof of the Texas Tech University (TTU) test building. The nominal (prevalent at the TTU site) wind and two bounding (low and high turbulence) flows were simulated in a boundary-layer wind tunnel at Colorado State University. The results showed significant increase in the pressure peak and standard deviation with an increase in the flow turbulence. It was concluded that the roof mid-plane pressure sensitivity to the turbulence intensity was the cause of the previously reported field-laboratory mismatch of the fluctuating pressure, for wind normal and $30^{\circ}$-off normal to the building ridge. In addition, it was concluded that the cornering wind mismatch in the roof corner/edge regions could not be solely attributed to the wind-azimuth-independent discrepancy between the turbulence intensity of the approach field and laboratory flows.

Stress Analysis of Semi-Rigid Steel Frame (부분 고정 강골조의 응력해석)

  • 안성기;김순철;이수곤
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2000.04b
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    • pp.35-42
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    • 2000
  • Among the various models proposed for the description of semi-rigid connection behavior, Kinney's fixity facto. (=f) definition is adopted. If one follows this definition, f=1.0 signifies a completely fixed connection and f=0.0, the frictionless hinge. Kim's new slope-deflection equations based on the Kinney's fixity factors are the principal idea of this paper. Proposed finite element program also includes the effect of axial shortening of column, which is neglected in the stress analysis of frame leg conventional slope-deflection method. For the economic design, especially for the saving of beam weight in the high-rise office buildings or apartment houses, the proposed method can be applied.

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The Characteristics of Dynamic Behaviors for the Spatial Structures under Seismic Loads (지진하중을 받는 대공간 구조물의 동적 거동 특성)

  • Kim Min-Sik;Lee Sang-Ju;Lee Dong-Woo;Han Sang-Eul
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2005.04a
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    • pp.628-635
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    • 2005
  • The earthquake-resistant structural systems have to ensure the sufficient stiffness and ductility for the stability For those purposes, recently, the seismic isolation system to reduce earthquake energy has been used. So, it is necessary to examine the characteristics of dynamic behavior of spatial structures governed by higher modes rather than lower modes different from the cases of high rise buildings. The objectives of this paper are to inspect the efficiency of the equivalent model method according to the various earthquake loads and half-open angles. Moreover it is examined the dynamic behaviors according to change the mass and the stiffness of sub-structures as a fundamental study of performance design for the spatial structures. Finally, seismic isolation system is applied to boundary parts of roof system and sub-structure to obtain the target performance.

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The Evaluation of Wind-induced Pressure for the Shell Structures using Computational Fluid Dynamics (전산유체역학을 이용한 셸 구조의 형상에 따른 풍압 평가)

  • Han, Sang-Eul;Park, Ji-Seon
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2008.04a
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    • pp.579-584
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    • 2008
  • The importance and the interest of wind load have emphasized since the damage of the Jeju World cup Stadium and Main Stadium of Busan Asiad in 2002, and the appearance of high-rise buildings. In general, a evaluation for the wind load acting on structures have been carried out mainly through the wind tunnel test, but this technique has the huge shortcomings that consume too much cost and experimental time. However, with the rapid advances on computers, it is possible to analyze the wind pressure distribution acting on structures by numerical scheme. In this paper, to predict the wind pressure distribution acting on shell structures having the various shape by numerical simulation, governing equations of fluid flow and turbulent model is formulated. Also, evaluates the wind pressure coefficient in accordance with the structural shape for shell structures like as a membrane structures and dome structures.

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Structural Design and Construction of the Foundation of TOKYO SKYTREE

  • Konishi, Atsuo;Emura, Masaru
    • International Journal of High-Rise Buildings
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    • v.4 no.4
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    • pp.249-259
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    • 2015
  • This paper introduces the structural design and construction method for the foundation of the TOKYO SKYTREE, a new digital broadcasting tower in Tokyo, which has a height of 634 meters. The surface layer of the ground is occupied by soft soil, thus the foundation of this tower is an SRC continuous underground wall pile, designed and developed to have horizontal rigidity and pull-out resistance. The structural integrity and construction method of the wall pile was verified with an on-site full scale pull-out test concluding a maximum load of 40,000 kN.

Performance Based Fire Engineering in the UK

  • Plank, Roger
    • International Journal of High-Rise Buildings
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    • v.2 no.1
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    • pp.1-9
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    • 2013
  • This paper reviews the recent developments in fire engineering and the design approaches which are being used in the UK, compared with traditional prescriptive solutions. The research background which has underpinned this is briefly summarised, and the benefits of these more advanced methods are discussed. The focus is on structural fire engineering, but some consideration of modelling fires is also included. Some of the more commonly used design tools are discussed, together with the relative benefits they offer. The use of these more advanced approaches is then outlined in the context of which building types might be most suitable, and a number of case studies are included to illustrate this. Likely future developments are also discussed.