Due to the insufficient radial stiffness of the steel tube. the cracking of the weld and the plastic deformation of the string often occur under the cyclic loading of the hollow section pipe joint. In order to avoid such a failure. the overlapped K-joints were strengthened by pouring different concrete into the chords. https://www.hindigyanvishv.com/best-flash-CoQ-Clear-100-Ubiquinol-60-Softgels-Citrus-deal-zone/