센코어테크 진천 공장 및 2024년 2월 현재 시공 진행중인 플랜트 현장의 모습들입니다.

아래 링크 또는 이미지를 클릭하면 유튜브의 해당 영상으로 직접 연결됩니다.

유튜브의 자막 기능을 켜면 영문 자막을 보실 수 있습니다.

https://youtu.be/Rik1aEKge_A

• 저자: 엄태성, 임종진, 문성환, 윤성환, 정재철
• Abstract :This study investigated the flexural behavior of prestressed concrete-encased steel composite beams (PSC composite beam) with hollow core. The PSC composite section consisted of the precast composite element, made of a steel section (H or box section) and U-shaped concrete encasement, and the cast-in-place concrete slab. By prestressing strands at the bottom of the precast element, the cracking resistance was enhanced. In addition, a void was formed in the web to reduce the beam weight. Six full-scale PSC composite beams were tested under positive bending and their flexural behaviors before and after casting the cast-in-place slab were investigated. The test results have shown that the initial strains of the steel section and reinforcing bars that occurred at the prestressing stage agreed well with the predictions by the existing PSC design theory. During the subsequent flexural testing, all beams were failed by concrete crushing at the compression end or slab. The stiffness and strength of the PSC composite beams agreed well with the effective stiffness and plastic moment strength for encased composite members, respectively, calculated in accordance with AISC 360-16. At the interface across the cast-in-place slab, relative slip did not occur and the interface shear resistance was contributed by both the vertical stirrups of the precast concrete encasement and headed studs of the steel element engaged or embedded within the slab.

DOWNLOAD

• 저자: 이호준, 박홍근, 황현종, 김창수
• Abstract: Existing experimental results show that carefully designed RC column-to-steel beam (RCS) joints have high seismic resistance comparable to those of traditional steel or RC frames with seismic details. However, such high seismic performance requires complicated and expensive strengthening details, which causes difficulties in fabrication and construction. This study investigated simpler strengthening methods, targeting moderate seismic capacity. Four interior RCS joint specimens were tested under cyclic lateral loading. The major test parameters were the strengthening details of the beam–column joint such as face bearing plates, transverse beams, and headed studs. The test specimens with the proposed methods exhibited good deformation capacity exceeding 4.0% story drift ratio after yielding of the beams and beam–column connection. However, the peak load did not reach the nominal strength based on the beam plastic moment due to early joint damage. The failure modes and test strengths were compared with the predictions of ASCE design guidelines. On the basis of the results, design recommendations for the simplified connection details were proposed.

LS전선은 강원도 동해시 국내 유일, 아시아 최대 규모의 초고압 직류 송전 (HVDC) 해저 케이블 전용공장인

“해저4동”을 준공하여 2023년 5월 가동을 시작하였습니다.

해저4동의 핵심 생산설비인 초고층 VCV타워 (수직연속압출시스템; Vertical Continuous Vulcanization)는

높이 172미터, 주거용 아파트 기준 약 63층 높이로서 이 지역의 랜드마크가 되었습니다.

이 VCV타워에는 센 엔지니어링그룹의 PSRC기둥과 TSC보가 적용되어 여타 공법 대비 공사 기간을 대폭 단축하였고

시공 정밀성과 공사비용 측면의 우수성도 입증하였습니다.

• 저자: 엄태성, 멀무히유발트, 임종진
• Abstract: In this study, the seismic performance of exterior beam-to-column connections with SD600 beam reinforcements was investigated. Six specimens designed to exhibit beam yield mechanism were tested under cyclic loading. Rectangular spirals were used for shear reinforcement at the beam-column joint where the SD600 beam reinforcements were anchored by 90º standard hooks. Concrete strengths (32.2 and 52.2 MPa), reinforcement yield strengths (442 and 662 MPa), the use of steel fiber concrete were considered as test variables. The tests showed that although the development lengths of SD600 steel bars specified in design codes were not satisfied at the joint with the limited depth, bond slip and anchorage failure did not occur in most specimens. The deformation capacities were larger than 5% in drift ratio, but in three specimens out of five specimens SD600 steel bars used for beam reinforcements eventually ruptured due to the deficient post-yield hardening behavior. The bond and shear behavior at the joint was improved by the use of higher compressive strength concrete and steel fiber concrete.

중대재해처벌법 등 안전 관련 규제 기준이 전에 없이 높아지고 있습니다.

PSRC는 골조공사에서 인력 투입과 안전상 risk 대부분을 차지하는 배근 및 철골 조립 공정과

거푸집 등 가설 공정 전체를 최적의 가공 설비를 갖춘 공장에서 100% 선조립 하고

반조립 상태의 부재를 현장에 운반하여 erection과 타설만으로 설치 공정을 완료함으로써

골조 공사 기간을 대폭 단축할 뿐 아니라 안전하고 깨끗한 현장 환경을 구현합니다.

아래 영상은 2020년 말에 시공한 PSRC 합성기둥 공법 국내 설치 현장 time lapse 영상입니다.

(사진을 클릭하면 동영상이 열립니다.)

PSRC Building Motion-SD 480p

• 저자: 엄태성, 임종진
• Abstract: In this study, the flexural behavior of noncompact and slender concrete-filled U-section (CFU) beams was investigated focusing on local buckling of U-section walls and shear transfer across the beam-to-slab interface. Seven large-scale CFU beam specimens were tested under negative bending. The width-to-thickness ratios of U-section walls (i.e., flanges and webs) and stiffening details for preventing local buckling were considered as the test variables. The tests showed that, due to excessive slab reinforcement, all specimens were failed by shear failure at the composite interface of beam and slab after flexural yielding. The ultimate strength and deformation capacity of CFU beams were degraded by flange and web local buckling. Buckling modes of U-section walls were affected by the stiffening details. The ultimate strengths of noncompact and slender CFU beams were compared with the nominal strengths calculated in accordance current standards. In addition, the flexural behavior of CFU beams affected by the local buckling and partial debonding of U-section walls and slip behavior at the composite interface was further investigated through fiber-based section analyses based on the effective stress–strain models of materials.

상기 CTIL 연구개발 지원 플랫폼은 싱가포르 국립기술대학 (SIT; Singapore Institute of Technology)의 주관으로 현지 1군 건설사인 Woh Hop 사를 비롯한 관련 업계와 싱가포르 건설청(BCA)의 연구비 지원으로 운영됩니다.

치열한 경쟁과 심사과정 끝에 당사를 비롯하여 Natsteel사, TTJ사 등 현지에서 기술력을 인정받은 유수의 업체들이 선정되었습니다.

당사는 본 프로젝트를 통하여 기존 공법 대비 공사비 25% 절감을 목표로 혁신적인 ERSS (Earth Retaining and Stabilizing Structure) 시스템을 개발할 예정입니다.

지난 7월13일 SIT에서 열린 협약조인식에는 Mr. Tan Kian How (陈杰豪) 싱가포르 정보통신부 장관(Sen. Minister of State for Communications and Information), Mr. Kelvin Wong 싱가포르 건설청장 (CEO of BCA) 등 많은 VIP들이 내방하여 주셨습니다.

본 협약조인식 관련 싱가포르 정부 공식 발표는 여기 를 참조해 주십시오.

<DOWNLOAD>

•  싱가포르의 건설시장과 건설기준 BC1 내 KS표준 등재 추진

• 저자: 이승환 대표

• 저자: 임종진, 김연희, 엄태성
• Abstract: Concrete-encased steel angle (CEA) column is an encased composite column where structural angles are used for longitudinal and transverse reinforcements. In this study, the compressive behavior of CEA columns was investigated, focusing on the use of high-strength concrete and noncompact and slender steel angles. Ten CEA column specimens (concrete strength fc’ = 33 and 66 MPa and steel yield strength Fy = 454–552 MPa) were tested under compressive loading. The section classification of steel angles and the spacing of transverse ties were considered as test variables. The tests showed that the cover concrete spalled off at peak loads and local buckling occurred in steel angles. Due to the use of high-strength concrete, the compressive strength (i.e., peak loads) was increased but the post-peak degradation behavior became steeper. The peak and residual strengths of CEA columns were examined focusing on the effects of cover failure, confinement by transverse ties, and local buckling of steel angles. Based on the results, empirical equations to estimate the peak and residual strengths were proposed and the validity was assessed by comparisons with the test results.