EXPERIMENTAL RESEARCH OF STEEL TRUSS COUPLING BEAM ON ASEISMIC BEHAVIOR AND ENERGY DISSIPATION MECHANISM

摘要

Experiment has been made to study aseismic behavior of steel truss coupling beam(STCB). Two groups of specimens were tested The first one owned crossed braces but another did not. Monotonic horizontal and low reversed cyclic loadings were imposed on the beams, and strains and displacements were gathered to analyze hysteretic behavior by depicting hysteretic curves of the structure and its components separately and to study dissipated energy quantitatively by calculating working index. Then to study energy dissipation mechanism and the effect of crossed braces, comparing strains of braces with chords of the two groups of trusses suggests that crossed braces precede chords to reach into plastic to dissipate energy. On the other hand, aseismic behavior of STCB can be revised conveniently by changing geometric characteristics of sections of the crossed braces. Results show that STCB has more reasonable characteristics in aseismic behavior and energy dissipation than others.