Dynamic properties and seismic response of RC structures characterized by abrupt change in horizontal connection stiffness

Publisher Summary This chapter presents the dynamic properties and seismic response of concrete structure characterized by abrupt change in horizontal connection stiffness. The structure characterized by uniform stiffness distribution has advantages of clear and definite transmission channel of earthquake loading. By contrast, the structure characterized by abrupt change in horizontal connection stiffness has disadvantages of complex mode shapes and acute stress concentration under earthquake motion. The number of mode shapes in calculation must be selected carefully in seismic response analysis by method of response spectra analysis. Complex and partly mode shapes caused by abrupt change in horizontal connection stiffness must be contained in calculation. In addition, denser discrete elements located in place of abrupt change in horizontal connection stiffness should be used to ensure accuracy of stress field. Stiffness of the connective members should be determined carefully in design. The stiffness of the connective members should be limited to a certain range. It will lead to acute stress concentration if stiffness of the connective members increases blindly. The chapter discusses only linear elastic behaviors of RC structure characterized by abrupt change in horizontal connection stiffness.