To study the cross-sectional capacity, global stability, and seismic performance of T-CDSCWs, three sets of T-CDSCW tests are designed and conducted. This chapter introduces the design, phenomena and results of the tests. Firstly, the cross-sectional capacity test of the T-CDSCW is conducted to study the cross-sectional capacity under axial compression and bending moment in the web plane, to which T-CDSCWs are mainly subjected. The web wall of the T-CDSCW specimen is designed to be wide, and eccentric compression in the web plane is applied to the T-CDSCW specimen during the test. Secondly, the global stability test of the T-CDSCW is conducted to study the global stability under axial compression. Flexural buckling about the asymmetry axis and flexural-torsional buckling about the symmetry axis of T-CDSCWs may occur under axial compression. To ensure that the buckling mode is flexural buckling, the web wall of the T-CDSCW specimen is designed to be short. Thirdly, the seismic performance test of the T-CDSCW is conducted to study the seismic performance under axial compression and cyclic horizontal load. The horizontal load is applied in the web plane and the seismic performances with flange in compression and tension are compared.