Estimation on the strength of bolted wood joints is indispensable in designing wood structures. According to the previous investigations, it has been proven that the yield theory which is a kind of limit analysis method is useful in estimating collapse loads of bolted wood joints, and several formulas have been given for the most common joint models such as single shear joints and symmetrical double shear joints. In actual wood structures, however, joints are much more complicated where asymmetrical double shear joints are commonly used, and usually several wood members which cross in each direction are connected with various kinds of nails, screws and bolts with each type of joint. Moreover, there have been very few papers investigating into the effect of frictional force on joint strength which plays an important role in the estimation of the strength of the joints. In this paper, the behavioral characteristics of simple wood joints, single shear joints and asymmetrical shear joints with one bolt were examined by taking into consideration of the effect of the frictional force, then, a multiple joint which consisted of four members and was connected with four kinds of bolts was investigated. All models tested were of the type mainly used in ships. It was found that the behavior of these wood joints was satisfactorily explained by the yield theory and by the usual beam theory on elastic foundation.