正交胶合木墙体-柔性支撑框架协同抗侧性能研究OA北大核心

To improve the performance of laminated timber frame structure systems,a beam-through steel-timber hybrid structure combining tension-only bracing and cross-laminated timber(CLT)walls for synergistic lateral resistance was proposed.To investigate the synergistic lateral resistance mechanism between CLT walls and tension-only braced frames,low-cycle repeated loading tests were conducted on two CLT wall-tension-only bracing composite frames.Furthermore,the impact of the lateral stiffness ratio between the CLT wall and the tension-only braced frame,as well as the rotational stiffness ratio between the CLT wall and the steel coupling beam,on synergistic lateral resistance was studied using finite element methods.The experimental results indicate that the failure sequence of the components in the composite frame follows the order of tensile yielding of the tension-only bracing,cracking at the ends of the glulam columns,and failure of the hold-down connections of the CLT wall.The tension-only bracing primarily functions during the elastic phase of the composite frame,while the CLT wall bears more than 50％of the horizontal force during the elastic-plastic phase of the composite frame.The finite element results indicate that when the lateral stiffness ratio between the CLT wall and the tension-only braced frame exceeds 0.055,the proportion of horizontal load borne by the CLT wall exceeds 25％.Additionally,when the rotational stiffness ratio between the CLT wall and steel coupling beam ranges from 0.52 to 0.84,the composite frame can maintain a strong column-weak beam failure mode while fully utilizing the load-bearing capacity of the CLT wall.