Takeaki Koshikawa

Hokkaido University

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Masaiki UEDA

Hokkaido University

Masaru KIKUCHI

Hokkaido University

Toshinaga Wada

Hokkaido Pharmaceutical University

Sachie Yamamoto

Muroran Institute of Technology

Hitoshi Yamashita

Hokkaido Pharmaceutical University

Mitsuo Mizoguchi

Muroran Institute of Technology

K. Komatsu

Hokkaido Pharmaceutical University

Takasuke Saito

Kanagawa University

Takeshi UCHIYAMA

Tokyo Dental College

Kazuyuki MORIHIRO

Cooperative Institutions

Hokkaido University

Muroran Institute of Technology

Hokkaido Pharmaceutical University

National Institute of Technology, Kushiro College

Shimizu (Japan)

Oiles (japan)

The University of Tokyo

Tokyo Institute of Technology

Nagaoka University of Technology

Research Institute of Technology (Russia)

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EVALUATION OF ULTIMATE STRENGTH AND ROTATION ANGLE FOR UNBONDED POST-TENSIONED PRECAST CONCRETE BEAMS BY USING SECTION ANALYSIS

Journal of Structural and Construction Engineering (Transactions of AIJ) (2014)

Makoto MATSUMORA Takeaki Koshikawa Masaru KIKUCHI

This paper describes new evaluation formulas of ultimate strength and rotation angle for unbonded post-tensioned precast concrete beams. These formulas are composed by two main variables, one is a reinforcement index(q) and the other is an effective prestressing level(λpe). To evaluate coefficients of the evaluation formulas, we carried out a parametric study with a numerical section analysis model, and obtained regression formulas for the coefficients. By applying the evaluation formulas to the results of parametric study and experiments on the past, we elucidate that the formulas evaluate the ultimate strengths and rotation angles of them accurately.

Precast concrete

Section (typography)

Angle of rotation

Prestressed concrete

10.3130/aijs.79.1005

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Citations (8)

THE PROPERTIES OF LEAD-RUBBER BEARINGS INCLUDING THE INFLUENCE OF VARYING VERTICAL LOAD UNDER SEVERE CONDITIONS

Journal of Structural and Construction Engineering (Transactions of AIJ) (2008)

Sachie Yamamoto Masaru KIKUCHI Takeaki Koshikawa Masaiki UEDA

The widespread use of seismic isolation has necessitated a better understanding of the more complex aspects of isolation device behavior. The properties of seismic isolation devices depend upon the interaction between horizontal and vertical forces acting on the isolator. The actual hysteretic behavior of an isolation bearing under a structure subjected to severe earthquake shaking is influenced by the variation of vertical load on the isolator due to overturning forces. To identify the mechanical characteristics of lead-rubber isolators, cyclic shear tests of isolators under varying vertical load were conducted. The authors propose an analytical model for predicting the behavior of isolators under varying vertical load conditions. The model can reflect the influence of varying vertical load on isolator properties, and this capability is confirmed by simulation analyses and comparison with the cyclic shear test results. The analytical model is also used to investigate the behavior of lead-rubber isolators under loadings more severe than typical design conditions.

Isolator

Seismic isolation

Lead (geology)

Isolation

10.3130/aijs.73.2101

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Moment and energy dissipation capacities of post-tensioned precast concrete connections employing a friction device

Engineering Structures (2017)

Takeaki Koshikawa

Precast concrete

10.1016/j.engstruct.2017.02.012

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Citations (49)

LARGE DEFORMATION/POST-PEAK BEHAVIOR ANALYSIS OF CONCRETE BEAMS AND COLUMNS INCLUDING BOND-SLIP OF REINFORCEMENT

Journal of Structural and Construction Engineering (Transactions of AIJ) (2004)

Takeaki Koshikawa Masaiki UEDA Toshinaga Wada Masaru KIKUCHI

The large deformation/post-peak behavior analysis method of concrete beams and columns considering bond-slip of reinforcement is developed. The analytical procedure is capable of predicting the response of concrete beams and columns under axial force and biaxial bending in the material and geometrical nonlinear domains, including post-peak behavior using the incremental arch length method. The paper gives an outline of the nonlinear analysis method which includes the effect of bond-slip of reinforcement to handle the large deformation region, and three numerical examples are given to illustrate the use of the proposed procedure.

10.3130/aijs.69.69_2

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Citations (2)

打撃試験に基づくコンクリート材の減衰特性評価に関する基礎検討

The Proceedings of the Symposium on Evaluation and Diagnosis (2022)

Mikihiro IWASAKI Dai KIKUCHI Kaori SAWAGUCHI Shinya Honda Masaru KIKUCHI

This study focuses on the vibration tests of concrete materials to evaluate their dynamic characteristics including damping property. The vibration tests are conducted based on the impact excitation using an impulse hammer. The vibration response of an object is measured by a laser Doppler vibrometer. Frequency spectra are analyzed by a spectrum analyzer from the measured time history responses. This vibration test approach is applied to several specimens with different dimensions and water-cement ratios. Damping ratio of each mode for a specimen is calculated by half-width method with the measured frequency responses. The vibration test results confirmed that it is possible to extract differences in natural frequencies and damping ratios due to differences in the dimensions and water-cement ratios of the specimens. The measured natural frequencies were compared to those calculated by finite element analysis, resulting in good agreement between them. It is verified from the experiments that the present vibration test approach for the concrete materials can evaluate their dynamic properties and is effective to develop concrete structures with a desired damping in future.

Damping ratio

Natural frequency

Hammer

Shaker

Laser scanning vibrometry

10.1299/jsmesed.2022.20.207

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Citations (0)

NON-LINEAR BEHAVIOR ANALYSIS OF RC FRAME STRUCTURE CONSIDERING SHEAR DEFORMATION OF JOINT

Journal of Structural and Construction Engineering (Transactions of AIJ) (2007)

Takasuke Saito Takeaki Koshikawa Masaiki UEDA Masaru KIKUCHI

Two dimensional non-linear analysis of reinforced-concrete frame structure considering shear behavior of joint panel is presented in the paper. Inelastic joint shear action under reversed-cyclic loadings is complicated: interaction between shear deformation of joint panel and bond failure of longitudinal reinforcements embedded in the joint. The purpose of the research is to propose a simple beam-column joint model to predict such a behavior of a joint panel. A finite element formulation of fiber beam/column elements, new joint element considering shear deformation and material model defined in analysis are presented. Simulation analyses for three different type beam-column joint specimens are conducted to confirm the validity of the proposed method.

10.3130/aijs.72.99_2

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CYCLIC LOADING TEST OF PRECAST PRESTRESSED CONCRETE BEAM-COLUMN CONNECTIONS WITH STEEL-CAP

AIJ Journal of Technology and Design (2008)

Hitoshi Yamashita Takeaki Koshikawa Toshinaga Wada Masaiki UEDA Mitsuo Mizoguchi

Experimental results of new precast concrete beam-column connections constructed by post-tensioning precast beams to precast columns using unbonded tendons are presented. The connections consist of precast beams which has steel cap at its ends and precast columns which has steel band at the connection region. The steel cap and steel band are used to reduce damage in the plastic hinge region of precast beams. Four test specimens were subjected to reversed cyclic loading and comparisons were made between the behavior of presented precast concrete specimens and conventional precast concrete specimen.

Precast concrete

Plastic hinge

10.3130/aijt.14.115

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21280 The Behavior of Seismically-Isolated Buildings Considering the Large-Deformation Characteristics of Laminated Rubber Bearings : Part1 An Analytical Model

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-2, Structures II, Structural dynamics nuclear power plants (2006)

Masaru KIKUCHI Takeaki Koshikawa Sachie Yamamoto Masaiki UEDA

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STRENGTHENING METHOD FOR REINFORCED CONCRETE FLAT SLAB USING EXTERNAL PRESTRESSING CABLES

AIJ Journal of Technology and Design (2007)

Kazuyuki MORIHIRO Masaiki UEDA Takeaki Koshikawa Masaru KIKUCHI

Conversion of an existing reinforced concrete building was done. In that case, several spans of flat slab structure of the building came to have to support the large increase of live load. In order to attain that purpose, a special strengthening plan using external prestressing cables was proposed, and reinforcement work was actually performed.This paper describes the design plan and the reinforcement work for the flat slab panels.

Slab

10.3130/aijt.13.137

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20183 Material Non-linear Analysis of PCaPC Beams with Compression Joint considering Bond-Slip of Tendon under Cyclic Loading

Summaries of technical papers of Annual Meeting Architectural Institute of Japan. B-1, Structures I, Loads, reliability stress analyses foundation structures shell structures, space frames and membrane structures (2004)

Takasuke Saito Takeaki Koshikawa Masaiki UEDA Masaru KIKUCHI

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