预应力钢木混合框架滞回行为理论计算方法研究OA

Replacing timber in the connection zones of conventional post-tensioned timber frames with steel to form post-tensioned steel-timber hybrid(PTSTH)frames can improve the initial lateral stiffness and deforma-tion capacity of the system.To efficiently analyze the lateral performance of PTSTH frames and optimize the design,a nonlinear calculation method for hysteretic responses was proposed based on the equation of the vir-tual displacement.The deformation description for this type of structures was established.The hysteretic con-stitutive models for connections and contact behaviors of the PTSTH frames were developed.Full-scale speci-mens PA and PT were fabricated by adding additional damping and stiffness brace(ADAS)and tension-only brace(TOB)to the PTSTH frames,respectively.The applicability and accuracy of the proposed method were verified based on the quasi-static test results,and the influence of the key calculation parameters on the calcu-lated results was discussed.The results show that the calculated results agree well with the experimental re-sults.The maximum absolute values of the relative errors between the calculated peak bearing capacity and the experimental results of specimens PA and PT are 5.3%and 2.0%,respectively.The calculation results can capture the asymmetric variation trend of prestress of the two specimens.The proposed method can be used for hysteretic behavior analysis on the PTSTH frames with different braces.