Durability of reinforced concrete is correlated to the water content. Since the main cause of water content increase is rainwater supply from the surface, it is important to understand the mechanism of absorption. This paper analyzes the initial absorption of cement mortar caused by the capillary phenomena. Absorption test for two liquids were conducted for various mix proportions under several relative humidity and surface treatments. By using Lucas-Washburn equation, parameters corresponding to pore structure and wettability of pore internal wall were evaluated. It was found that almost any mix proportions of cement mortar have approximately the same internal pore wettability.

It is difficult to inspect the soundness of underground walls using a pile integrity test (PIT) because the elastic wave caused by the input at the wall head spreads throughout plane of the wall. This paper describes a reasonable method for evaluating the soundness of underground walls using a PIT. By applying a low-pass filter to the reflected wave observed at the wall head, the wave components reflected from the wall ends and cracks can be separated from the components reflected from the wall sides. This allows the wave to be clarified for soundness evaluation.

A series of modal response spectrum analyses were performed on 60m to 150m spanned lattice domes with the half subtended angle ranging from 20 deg. to 30 deg. to investigate the effect of the dynamic characteristics of the substructure’s higher mode. It was found that the current equivalent static seismic loads underestimate the roof response when supported by multi-story substructure with the 1st natural period in the range of 0.5s to 1.2s. Therefore, a modified equivalent static seismic load considering the antisymmetric roof mode’s amplification by the substructure’s second mode was proposed and validated.

To investigate whether previous proposed method can estimate bending capacity and shear capacity of steel rebar - glulam timber composite beam, 15 full-scale beam specimens, which a 3 rebar-embedded lamina was bonded as upper and lower outer layer of beam, were applied to loading tests for bending failure or shear failure. Moreover, push-out loading test of rebar in wood test pieces cut-out from one of the tested beam specimens was conducted to verify estimation method for shear capacity determined owing to shear failure around rebar.

Joint hinging failure and succeeding axial failure of a R/C corner column-beam joint were investigated by static tests with three-dimensional beam-column subassemblages under varying axial and bi-lateral loads, where the axial compression stress ratio ranged from 0 to 0.13. Corner joints suffering joint-hinging failure were not able to sustain column axial load at a story drift angle of 3% to 4%, resulted in joint axial failure. This was caused by crushing of joint core concrete, pull-out of a 135-degree hook of joint lateral hoops due to dilation of joint concrete, and buckling of column longitudinal bars in the joint region.

Metal work refers to a series of processes that manufactures and constructs various metal finishing materials. In this paper, three steps of fundamental experiments of bolted joints in metal work were conducted. The test results show that the slotted hole reduces slip coefficient by about 30% and the slip coefficient of the surface treatments for rust and corrosion prevention is about half smaller than that of the surface in high strength bolted friction joints. Furthermore, from the experiments on the examples of metal finishing materials, the structural safety of the bolted joint against external forces was investigated.