• Title, Summary, Keyword: construction joint

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Behaviour of RC beam-column joint with varying location of construction joints in the column

  • Vanlalruata, Jonathan;Marthong, Comingstarful
    • Earthquakes and Structures
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    • v.20 no.1
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    • pp.29-38
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    • 2021
  • According to ACI 224.3R-95 (ACI, 2013), construction joints (cold joint) in the column are to be provided at the top of floor slab for column continuing to the next floor and underside of floor slab and beam. A recent study reveals that providing cold joint of the mentioned location significantly reduced the seismic performance of the frame structures. Since, the construction joints in multi-story frame structures normally provided at the top of the floor slabs and at soffit of the beam in the column. This study investigated the effect of construction joint at various location in the column of beam-column joint such as at the top of floor slab, soffit level of the beam, half the depth of beam below the soffit of the beam and at a full depth of the beam below the soffit of the beam. The study revealed that there is an improvement in seismic capacity of the specimens as the location of cold joint is placed away from the soffit of the beam for lower story column.

Comparison with Load Transfer Efficiency for Joint Types in Airport Concrete Pavements (줄눈형식에 따른 공항 콘크리트 포장 하중전달율 비교)

  • An, Ji-Hwan;Jeon, Sung-Il;Kwon, Soo-Ahn;Kim, Min-Woo
    • International Journal of Highway Engineering
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    • v.16 no.3
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    • pp.9-20
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    • 2014
  • PURPOSES : This study is to compare load transfer efficiency of key joint and dowel joint for airport concrete pavement. METHODS : As AC150/5320-6D of FAA's [Advisory Circular] was changed into AC150/5320-6E, Key joint type of rigid pavement were excluded from Construction Joints. LTE(Load Transfer Efficiency) of dowel joint and key joint were compared by times and seasons through pavement temperature measurement, ocular investigation and HWD measurement. RESULTS : For the joint performance grade of No. 2(The second) runway of airport, 12% of poor rate was observed in key joint and 2% of poor rate in dowel joint. Poor rate of key joint was increased to 17%, if only No. 3~No. 6 slabs, which are mostly loaded from the airplanes, were applied for the study. In apron area, LTE poor rate of key joint was high in winter, and LTE poor rate of dowel joint was at least above 'Fair' grade. In summer, 'Fair' for key joint, 'Acceptable' for dowel joint appeared. CONCLUSIONS : As results, dowel joint was superior than key joint for LTE. Deviations of seasons and times were smaller in dowel joint's result. And LTE in winter was lower than LTE in summer.

A Study on Economic Evaluation Method of Steel Erection Work using by Self-supported Steel Joint (자립형 철골 접합부를 이용한 철골설치 방식의 경제성 평가에 관한 연구)

  • Kim, Changki;Kim, Taehoon;Cho, Hunhee;Kang, Kyung-In
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.3-7
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    • 2009
  • Construction projects are being the skyscraper and the large size by limited site condition and developing construction technology. Therefore, Steel structure work is steadily increasing caused by easy to work and structural safety. However, steel-frame work has the large incidence of heavy accident potentially. Recently a research group has recently developed newly designed self-supported steel joint for enhancing safety of steel erection work. Before applying the steel joint in a construction site, economic evaluation should be performed. Thus, we proposed the method for measuring economic efficiency of the new steel joint and verified economic feasibility of the steel joint method through a case study. As a result, Steel erection method using by self-supported steel joint showed economic rather than the one using by H-beams.

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A study on the characteristic and designing condition of Curtain wall (Curtain Wall의 특성 및 설계조건에 관한 연구)

  • Jeong, Eul-Gyu;Im, Chil-Sun
    • Journal of the Korea Institute of Building Construction
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    • v.4 no.3
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    • pp.125-131
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    • 2004
  • Nowadays, it seems we are in the high time of construction design because development of construction technology widen the option of construction exterior closing materials and deepen the high-tech construction method with all various materials. When we see the flow of construction market, the mainstream is the high-rise intelligent building, which makes the best use of the small midtown area efficently. Therefore, Alum curtain wall is becoming the main material of exterior construction, the concept of which is changing from just a simple window frame to an outer wall which has comprehensive function and capability. As we think of the importance of Curtain wall as a comprehensive outer wall, We should do thorough technical examination and verification at the stage of construction design and plan of carrying out construction.

An Experimental study on the Construction Standard for Sealer of Injection Type for Leakage Maintenance (누수보수용 주입형 실링재의 시공 기준에 관한 실험적 연구)

  • Lim Min-Chan;Cho Il-Kyu;Seon Yun-Suk;Oh Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.51-54
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    • 2005
  • The concrete structure hasn't perfect waterproofing performance but if it doesn't have a joint part that could isolate a permeability. Concrete structure(communication tunnel and underground structure) has an expansion joint and construction joint. There are a lot of joint type after construction or expansion, shrinkage, vibration, over load, performance of decline etc.. they offer a water of way by variety change. In this reason, It carries in effect a waterproofing work for the concrete structure of waterproofing. but the structure has a behavior that cause a problem by waterproofing layer of damage, heaving phenomenon, temperature of shrinkage. In this study, we will estimate a field of application for Sealer of injection type for leakage maintenance of construction standard on the waterproofing performance.

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Numerical study of stress states near construction joint in two-plate-girder bridge with cast-in-place PC slab

  • Yamaguchi, Eiki;Fukushi, Fumio;Hirayama, Naoki;Kubo, Takemi;Kubo, Yoshinobu
    • Structural Engineering and Mechanics
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    • v.19 no.2
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    • pp.173-184
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    • 2005
  • For reducing construction cost, two-plate-girder bridges are getting popular in Japan. This type of bridge employs a PC slab, which is often cast-in-place. In such a case, concrete is not usually cast over the whole slab at one time: some portions are constructed earlier than the rest. Therefore, a construction joint is inevitably created. Due to the drying shrinkage of concrete, tension stress may occur in concrete slab. High tensile stress can be expected near the construction joint where concretes with different ages meet. Moreover, prestressing is not applied over the whole length of slab at one time. This may also serve as a source of tensile stress in the slab. Thus there is a chance that cast-in-place PC slab, especially near the construction joint, may be subjected to tensile cracking. In the present study, stress states near the construction joint in the cast-in-place PC slab of a two-plate-girder bridge are investigated numerically. The finite element method is employed and the three-dimensional analysis is conducted to see the influence of dry shrinkage and prestressing. The stress states in the PC slab thus obtained are discussed. The simplified model of a plate girder for this class of analysis is also proposed.

A Study on the Evaluation of Tensile Performance According to Pareral Jointing Methods of the Sheet Membrane Waterproofing System (방수시트의 평행접합방법에 따른 인장성능 평가연구)

  • Lee Jeoung-Yun;Oh Mi-Hyun;Kwak Kyu-Sung;Oh Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • v.y2004m10
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    • pp.39-44
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    • 2004
  • A heat and room temperature construction method of asphalt have been mainly applying to rooftop waterproofing in concrete structure, and the rest construction method are sheet, membrane and mortar waterproofing construction method. In particular, joint method in sheet waterproof method is as overlap joint which on being reinforced with fiber and tape, have been applying for job site to mechanical fix using protection disk and anchorage and metal ironwork on the end of sheet. These construction method cause cutting off joint of sheet as behavior of structure according to repairs of sheet itself and thermal conduct, outdoor air environment. In conclusion, we analyzed and examined the application of various sheets and piece ashes about superior 'I' joint which divide from one and the other sheet and progressed about joint construction method of fixing method for overlap.

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Simple Joint Method for the Connection of the Excavation Support System (흙막이 지보공을 연결하기 위한 심플 조인트 공법)

  • Oh, Sung-Nam;Hong, Seong-Young;Bu, Sang-Hyeok;Yoo, Ki-Cheong
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.336-343
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    • 2005
  • In the braced excavations, careful consideration must be given to the risks of progressive collapse of the entire support system due to failure of a single member. The existing connection methods of the excavation support system results in many problems during construction. To overcome these, simple joint method is proposed in this study. The full scale test and the numerical analysis using finite element method were performed to verify the safety of them. As results, simple joint method was good effective to increase strength. And it was good effective to decrease in numbers of bolt. Also, new method is cheaper than existing connection methods and a good construction as well.

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Deformation Characteristics of Construction Joint of Paved Track on Earthwork Section using the Accelerated Track Test (궤도가속실험을 통한 포장궤도 토공구간 시공이음매부의 변형특성 연구)

  • Lee, Il-Wha;Jang, Seung-Yup;Kang, Yoon-Suk;Um, Ju-Hwan;Kim, Eun
    • Journal of the Korean Society for Railway
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    • v.13 no.5
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    • pp.521-527
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    • 2010
  • The Paved Track is applied to reduce maintenance cost of conventional line. The Paved Track could be used in all types of lines including earthwork, bridge, tunnel and turnout sections. In case of earthwork section, the construction joint is the most critical factor to track durability. The construction joint does not affect to the track structure directly, but the gap due to discontinuity of slabs may affect to the long-term serviceability. To evaluate this problem, the accelerated track test has been performed on the construction joint and the middle part to of the real scale Paved Track. The purpose of this test is that evaluate the vulnerability of construction joint section comparing the trends of settlement and earth pressure under repeated loads of construction joint with those of the middle slab part.

A Study on complex waterproofing Method Using Part of Joint Watertightness Improved Sheet (접합부 수밀성 향상 시트를 이용한 복합방수 공법에 관한 연구)

  • Suh Woo-Il;Kim Su-Ryon;Kwak Kyu-Sung;Oh Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • v.y2004m10
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    • pp.1-6
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    • 2004
  • We ensure a flat and regular basic surface by using part of joint waterproofing improved sheet method applying the upper slab of a concrete structure. We solve the problem of getting loose scale the general sheet by waterproofing of the sheet and improving adhesive strength of the basic concrete. Also, waterproofing sheet union to problem of joint have solved using of insertion type method so that, it improved a watertightness. It has improved in resist impact, resist abrasion and it is the effect of shortened construction period and cutting down on construction expenses. Here are the special quality and superiority of this waterproofing research. (1) Level material has the super adhesive strength so that it makes the basic surface without the gab of waterproofing sheet and waterproofing layer with the string adhesive strength. (2) We unite the sheet with the joining part between sheets by waterproofing sheet joint using of method. (3) There is the effect of shortened construction period and cutting down on construction expenses without waterproofing of protection.

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