In this study, we tested for identifying dimensional effects of rotational stiffness of wedged and halved scarfed joint. At first, a model of stress distribution in bending was made from observation of joints fracture under four-point bending tests. Proposal of rotational stiffness design formula(M �) was derived from this model. Under the tests, M � equation values well corresponded to all types of experimental ones. In particular, rotational stiffness rose in proportion to the cube of the materials height and the cogging width and had asymptotic limit value. These tendencies corresponded to the experiment results.

The objective of this study is proposing a design method to estimate the load-slip characteristics of the bolted joints with steel side plates. It is well known that maximum load of the joints greatly exceeds the allowable load.In the current design spceification, the ultimate load can be determined by the use of the increment factor however, the load-slip behavior cannot be predicted without using the numerical analysis.The method presented here is applying a bi-linear model to the load-slip relationship until the ultimate state where the axtial force in the bolt must be taken into account. Characteristic values conducted here generally showed good agreement with the verification experimental results.

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