The objective of this study is to understand the flexural reinforcement effects of RC slab reinforced with HFRP plate. To this end, an experiment was conducted by fabricated five RC slabs with the variables such as the number of anchors, epoxy injection amount and position. The Strength formula calculation on the specimens, was calculated to apply the ACI 440.2R-08(10.2.10). The results of this study, the stiffness, strength and structural performance of reinforced specimens are appeared very high compared with non-reinforced specimen, so the flexural reinforcement effects were very good. And the flexural reinforcement effects depending on the number of anchors and epoxy injection method was confirmed to differ greatly. Additionally, it is possible to predict the required number of anchors to the structure through the strength formula calculation.

This study investigated the flexural performance of high performance fiber reinforced cementitious composite (HPFRCC), which used high strength steel fibers with volume fraction 8%. Under the third-point loading using a closed-loop, servo-controlled testing system (ASTM 1609), load-deflection curves were obtained. The major test variables include silica fume replacement ratio 15% and exposure termperature, ambient and 400°C. The flexural strength was similar to the compressive strength and the absorbed fracture energy was relatively greater than other typical HPFRCC materials. This may be a composite reaction of the strong bonding between steel fiber and matrix and high compressive strength of the matrix itself. Once the specimens were exposed to high temperature 400°C the flexural strength decreased.

In this study, A preliminary research has been attempted by design and strength analysis on a series of precast ultra high-strength concrete slab systems in order to evaluate. To compare with conventional reinforced concrete slabs, current slab systems can improve serviceability and ultimate load capacities, crack control, and durability, so as to apply in long span, lightweight, and slender building slab systems.

Recently, studies of eco-friendly construction materials have been increased. For this reason, this paper presents the material properties of steel fiber reinforced slag concrete. Direct shear, flexural, and CMOD tests were conducted to determine the shear and flexural contribution of steel fiber.

In this study, it was developed eco-friendly alkali-activated slag fiber reinforced concrete using ground granulated blast furnace slag, alkali activator (water glass, sodium hydroxides), and steel fiber. Eight reinforced concrete beam using alkali-activated slag concrete were constructed and tested under monotonic loading. The major variables were mixture ratio of alkali activator, mixed/without of steel fiber. Experimental programs were carried out to improve and evaluate the flexural performance of such test specimens, such as the load-displacement, the failure mode, the maximum load carrying capacity, and ductility capacity. All the specimens were modeled in scale-down size. The reinforced concrete beams using the eco-friendly alkali-activated slag fiber reinforced concrete was failed by the flexure or flexure-shear in general. In addition, the maximum strength increased with the adding the mol of sodium hydroxide, and the specimen reinforced the steel fiber showed the value of maximum strength which is increased by 15.8% through 25.9%. It is thought that eco-friendly alkali-activated slag fiber reinforced concrete can be used with construction material and product to replace normal concrete. If there is applied to structures such as precast concrete member and production of 2nd concrete product, it could be improved the productivity and reduction of construction duration etc.

본 연구에서는 대공간 구조물에 보편적으로 사용되는 직접기초의 단점을 보완하기위해 PHC 파일기초와 철골기둥의 접합부에 대한 개발을 진행하였다. 기존의 제안된 접합부들이 플레이트를 이용하여 휨으로 인한 처짐을 막기 위해 해당 부분에 과도한 보강이 필요한 것과는 달리, 개발된 반구형 접합부(HAT Joint)는 반구의 형상으로 인해 기둥에서 파일로 전달되는 하중이 축력으로만 작용하게 되어 휨에 대한 우려를 최소화 하였다. 또한 H형강용 기본 타입인 H-Type 외에도 각형, 원형, 왕형 철골기둥에 설치가 가능하도록 다양화 하였다. HAT Joint는 공장에서 상부 철골 기둥의 일부와 결합된 상태로 현장에 운반되어 PHC 파일과 볼트로 결합하게 되므로 공기 단축 및 시공품질 관리 향상에 큰 이점이 있다. 기둥과 기초파일의 접합부인 HAT Joint는 압축력과 휨에 대해서 성능이 검증되어야 한다. 압축력은 φ1000 PHC파일의 허용압축강도인 967ton의 1.5배인 1500ton을 충분히 만족하는 것을 실험을 통해 확인하였다. 본 연구에서는 시공 시의 현장상황 혹은 갑작스러운 지진 등 예상하지 못한 횡하중에 대한 안정성을 검토하기 위하여 휨 실험을 통해 성능을 검증하였다. 실험은 두 개의 PHC파일과 연결된 접합부의 철골 기둥을 연결하여 그 중심점을 가력하는 형태로 성능평가를 진행하였다. 이를 통해 개발한 접합부가 압축 성능뿐만 아니라 휨에 대한 성능도 만족하였음을 검증하고자 한다.

This paper presents a half-precast composite concrete slab using a strain-hardening cementitious composites (SHCC). The flexural characteristics of SHCC-RC Composite slab was evaluated with a conventional reinforced concrete slab and the composite slab was excellent in crack control to compare with the reinforced concrete slab.

this study is experiment result of steel fiber reinforced concrete(SFRC) panel with flexural and impact resistance performance. The variables are the fiber volume fraction and aggregate size. The height and width of SFRC panels are 200 mm. The experimental results showed that flexural and impact resistant performance is improved by increased in steel fiber volume fraction.

The purpose of this study was to effects on flexural performance of SFRC prism with different fiber volume fraction. The test variables such as aggregate maximum size(8, 13, 20mm) and steel fiber volume faction(0, 1, 2%). Specimen size is 100×100×400mm and tested in for points loading. Test results indicated that increase the fiber volume fraction increase with flexural strength and smaller aggregate size more than higher performance with concrete.

This paper presents the comparison of the test results for material behavior for dry cast steel and synthetic fiber reinforced concrete. ASTM C1609 flexural beam test were carried out for two different fiber dosages of synthetic and steel fibers. Synthetic and steel fiber dosages were 2.4 kg/m3 and 13.1 kg/m3, respectively. From the results of tests, material properties were found including; compressive strength, first-peak load, peak load, and specimen toughness. ASTM beam load- deformation plots were obtained for each fiber beam to show the fiber behavior and strengthening after the initial crack.

The objective of this study is to investigate the safety of the slab type precast module. To achieve this, the designed slab type precast module was made using the manufacturing facility for the precast modular superstructure and the flexural performance test was conducted.

Eight small scale circular reinforced concrete columns were tested under cyclic lateral load with constant axial load. Test specimens were designed with 4.5 aspect ratio. The selected test variables are longitudinal steel ratio, transverse steel ratio, yielding strength of longitudinal steel and axial load ratio. The test results of columns with different longitudinal steel ratio, transverse steel ratio and axial load ratio showed different seismic performance such as equivalent damping ratio, residual displacement and effective stiffness. It was found that the column with low strength of longitudinal steel showed significantly reduced seismic performance, especially for equivalent damping ratio and residual displacement. The regulation of flexural over-strength is adopted by Korea Bridge Design Specifications (Limited state design, 2012). The test results are compared with nominal strength, result of nonlinear moment-curvature analysis and the design specifications such as AASHTO LRFD and Korea Bridge Design Specifications (Limited state design).

The existing evaluation method of flexural strength of the hollow slab considering only compressive zone above the hollow part is conservatively evaluated. In this study, the practical compressive zone of the hollow slab are considered to evaluate its flexural performance according to neutral axis location

This paper describes the flexural performance of concrete and strain-hardening cement based composite (SHCC) beams reinforced with normal and high-strength steel bar to evaluate the effect of reinforcing bar strength and cement composite type. The present investigation shows the potential of high-strength structure materials used of high-strength reinforcing bars with SHCC. And superior mitigation of crack-damage is observed reinforced SHCC beams than reinforced concrete beams

To evaluate the flexural performance of composite precast concrete ribbed slabs, tests are conducted with the variables of dapped-end configurations, support conditions, and longitudinal reinforcements. As the result of the tests, the performance should be evaluated by experiments and analyses using STM(Strut-Tie Model) for the design of dapped-end members

In this study, it was developed eco-friendly geopolymer concrete using ground granulated blast furnace slag and alkali activator(water glass, sodium hydroxides). Also, it was evaluated the flexure capacity of the RC beams using geopolymer concrete. The eco-friendly concrete using geopolymer encouraged alkali activation reaction has rapid hardening speed and showed possibility as a high strength concrete. Also, the RC beams applied this showed similar movement and destroy tendency with RC used previous cement

This study is to evaluate performance of two-way acting insulated sandwich wall panels through flexural experiment. The two-way acting panel resists wind loading on the panel and on the window. In this study, GFRP(Glass Fiber-Reinforced Polymer) Grid-type shear connectors are used for the composite action of the sandwich wall panels. Layouts of shear connector are considered as main parameter of this experimental study.

This study is to evaluate fatigue resisting capacity of insulated sandwich wall panel under wind-induced fatigue loading. The fatigue loading is calculated based on the probability distribution function (Weilbull and Rayleigh). The serviceability of the insulated sandwich panel was evaluated subjected to the probability-based fatigue loading.

This paper is about flexural performance of shotcreting SHCC according to stages. The study results showed that shotcrete SHCC is possible to connection of reinforced concrete frame and retrofitted member.

Strain Hardening Cement-based Composites(SHCCs) are attractive materials for energy dissipation and crack damage mitigation. This study investigated the flexural performance of SHCC beams layered Strain-Hardening Cement-based Composite(SHCC). The flexural behavior of RC beams carried out four-point loading test. Test results indicated that PE30_20 compared with Con30 initial cracking load, the stiffness, the yielding strength was higher.