Wan Shin Park

Panel Shear Strength of Steel Coupling Beam-Pseudo Strain Hardening Cementitious Composite Wall Connection

Hybrid coupled wall systems, where steel coupling beams couple two or more pseudo strain hardening cementitious composite (PSH2C) shear wall can be used in medium and high-rise construction subjected to earthquake. This paper addresses the panel shear strength of steel coupling beams - PSH2C shear wall connection. Test variables included the connection detail in hybrid coupled shear wall system. The results show that Specimens PSH2C-PSFF and PSH2C-PSFFT exhibits greater panel shears strength than Specimen PSH2C-PSF.

Effects of Matrix Ductility on Damage Tolerance of Diagonally Reinforced Coupling Beams

This paper investigates the effect of the ductile deformation behavior of high performance hybrid fiber-reinforced cement-based composites (HPHFRCCs) on the shear behavior and damage of diagonally reinforced coupling beams under reversed cyclic loading. The effects of matrix ductility on deflections, crack widths, crack patterns, failure modes, and ultimate shear load of the coupling beams have been examined. The combination of a ductile cement-based matrix and steel reinforcement is found to result in improved energy dissipation capacity and damage-tolerant inelastic deformation behavior. Test results showed that the coupling beam constructed with an HPHFRCC material exhibited excellent strength, deformation capacity, and damage tolerance capacity, in comparison with the regular reinforced concrete beam.

Influence of Cold Weather on Compressive Strength in High Performance with Silica Fume

This paper addresses the influence of cold weather on the compressive strength of high performance concrete with silica fume under different curing days. Test variables of this study are weather condition (5°C, -5°C and-15°C) and different curing days (7days and 28 days). In this work, the specimen was designed a water-binder ratio of 0.34. One batches of concrete were prepared for each mixing hour, and the compressive strength of cylindrical concrete specimens was measured after 7 and 28 days. Test results for concrete compressive strength show that the concrete’s best mechanical performance occurred when there was the least difference between ambient temperature and concrete temperature, that is, during the later hours of the day in hot weather conditions.

Effect of Mineral Admixture on Modulus of Elasticity in High Performance Concrete under Hot Weather Condition

This paper address the mechanical properties of high performance concrete exposed to hot weather in terms of compressive strength and the modulus of elasticity. The variable of this study is curing temperature of 35 °C and 50°C under hot weather condition.

The Behavior of Pseudo Strain-Hardening Cementitious Composite (PSH2C) Using Synthetic Fibers under Uniaxial Tensile Loading

The application of pseudo strain-hardening cement composites (PSH2C) to structural systems depends primarily on the tensile response of the materials, which is a direct function of fiber and matrix characteristics, the fiber content or volume fraction. In general, improved response of material is observed with an increase in the fiber volume fraction, as long as the fiber content does not impede mixing. This paper addresses the direct tensile response of pseudo strain hardening cement composites (PSH2C) reinforced with PET fibers, which belongs to a class of discontinuous short fiber reinforced cement based composites characterized by a strain hardening and multiple cracking responses under direct tensile loading. The variables are different types of fibers (PET, PET+PE, PET+PVA).

The Relationship of Compressive Strength and Tensile Strength of High Performance Concrete

Fly ash and blast furnace slag dumped not only pollutes environment, but also consumes landfills. With the aim of sustainable development, the isolated contribution of fly ash and blast furnace slag in concrete to the mechanical properties of frame concrete is investigated. An experimental study is conducted to investigate mechanical properties of high performance concrete. Test variables are the replacement levels for FA series (10%, 20% and 30%) and for BS series (10%, 30%, 50% and 70%) in place of part of cement. Compressive, splitting tensile strength, modulus of elasticity and flexural strength tests were carried out to evaluate the mechanical properties for up to 7days and 28 days. The mechanical properties of high performance concrete compared with predicted values by ACI 318-02 Code, EC 2-02, JSCE Code, KCI Code and proposed Eq.

Influence of Curing Temperature on the Compressive Strength of High Performance Concrete

The supposition that curing at cold weather conditions leads to the loss of compressive strength of the high performance concrete was investigated. This paper addresses the results of an extensive experimental study on the compressive strength under cold weather conditions. The specimen was prepared as it’s inside 100-mm diameter and 200-mm heights cylindrical were used. In this work, high performance concrete was designed a water-binder ratio of 0.40. These tests were carried out to investigate the mechanical properties of HPC for 7 and 28 days. The results properties of HPC with silica fume were effective for compressive strength improvement between 7 to 28 curing days at 5°C, -5°C and-15°C.

Hysteretic Behavior of Reinforced Concrete Coupling Beams with Diagonal Headed-Bars

This paper addresses the seismic behavior of coupling beams with headed reinforcing bars in coupled shear wall system. Test variable included the replacement ratios of headed reinforcing bars. The results show that Specimen HB 50 exhibits a better stable behavior in comparison with Specimens Specimen CON and Specimen HB 30. Test results showed that the amount of diagonal reinforcing bars in the coupling beam may be reduced when headed reinforcing bars are utilized.

The Influence on Horizontal Ties of Steel Coupling Beams

Hybrid coupled shear wall system with steel coupling beams has known as the effective lateral load resisting system for tall buildings subjected to earthquake. This paper addresses the influence on horizontal ties of steel coupling beams in pseudo strain hardening cementitious composite (PSH2C) hybrid coupled shear wall. Test variables included the connection detail and types of material, concrete and PSH2C, in the connection region. The results show that Specimen PSH2C-SB and PSH2C-SBVRT exhibits a better stable behavior than Specimens HCWS-SB and HCWS-SBVRT.