Tetsuya Mishima

Performance Based Design for Self-Compacting Structural High-Strength Concrete

This paper contains an historical review of self-compacting concrete (SCC) and clarifies the original concept. Further, combinations of self-compacting concrete for high strength and durability are discussed in relation to structural concrete design, construction and maintenance, and recent developments of performance-based design codes and manuals for SCC. On the competitiveness in industries, life-cycle cost is estimated for sustainable development of the infrastructure.

Simulation of early-age cracking due to drying shrinkage based on a multi-scale constitutive model

Cracking behavior of concrete caused by early age drying shrinkage is simulated based on a multi-scale computational system. The original analysis indicates that the deformation of a restrained concrete cannot be well simulated, and micro-crack status at surface is greatly overestimated. Therefore, a local tensile strength model treating micro-pore water pressure as prestress is proposed and applied to the cracking criterion. Furthermore, the influences of nonlinear creep and water diffusion speed on cracking are discussed by means of sensitivity analysis. With the optimized coefficients related to the above influences, finally cracking process of restrained concrete can be reasonably simulated.

Nonelastic Behavior of Axial Reinforcement Subjected to Axial and Slip Deformation at the Crack Surface

Reports on an investigation of the mechanical characteristics accross a crack of embedded reinforcement simultaneously subjected to axial and slip displacements from pure shear in particular, the effects of shear slip displacement on slippage characteristics were investigated

STUDY ON ANCHORAGE METHOD OF SINGLE PILE SUPPORTED FOOTING FOR POWER TRANSMISSION TOWER USING EMBEDDED STEEL ANCHOR

送電用鉄塔基礎の新しい基礎形式としての1本杭支持床板にいかり材で脚材を定着する方式において, 引抜き力が作用した際の破壊耐力について検討することが本論文の目的である. この定着方式には, 割裂応力による上端主鉄筋の降伏を伴う破壊と, コーン状のせん断破壊の2つの主要な破壊形式がある. そこで, これら2つの破壊形式について耐力算定式を検討した.