ABSTRACT
This study examined the rotational stiffness of joints between vertical and horizontal members in system supports used in the construction of rahmen-type bridge. While the system supports were commonly used to support the concrete weight during casting concrete, the collapse of system supports was frequently reported. In order to prevent repeated collapse of system supports, it is important to examine the accurate behavior of system supports. The structural behaviors of system support were affected by the large variations of geometric and mechanical parameters, notably joint stiffness, initial geometric imperfections, yield stress and load eccentricity. Among various factors affecting the complex behavior of system supports, this study focused on the stiffness of joints between vertical and horizontal members. Experimental tests were performed to estimate the rotational stiffness of joints between vertical and horizontal members. The considered joint type was wedge type which is generally used in Korea. Results showed that the initial rotational stiffness was between 16 kNm/rad and 34 kNm/rad which is similar to other researches.
