The research and development of hybrid structures cannot be referred as one with sufficiently actual results. In this report we suggested the wooden HP shells made by lumbers of two layers by which the direction lies at right angles with the lugscrew bolt. Here, an aramid fiber sheet is introduced into four wooden HP shells so that the intensity and rigidity of the shells are strengthened. This hybrid structure further combined with steel string beam structure is applied to Yamadera Post Office in Yamagata Prefecture.
