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基于对“强节点弱构件”这一概念的深化,对现有梁柱延性节点形式实行改进,即局部加大梁端焊缝截面,而且在离梁端一定距离处又适当削弱梁翼缘尺寸(以下称盖板加强型狗骨式节点),使梁端塑性铰外移的同时,梁柱节点既有较强的承载能力,又具备较好延性。利用ANSYS软件对盖板加强型狗骨式节点、狗骨式节点、盖板加强式节点以及普通型四种形式节点进行循环荷载下的非线性有限元分析,分析结果表明:盖板加强型狗骨式节点由于将塑性铰外移,增强了结构的耗能能力及延性性能,而又使节点的承载能力和初始刚度明显高于狗骨式节点,相对于盖板加强式节点,梁端翼缘截面尽管加强,但由于在离梁端一定距离处又适当削弱梁翼缘尺寸,不需要加大柱截面,从而达到节约钢材的目的。
Based on the deepening of the concept of strong member weak member, the existing beam-column ductile joint is improved by locally increasing the cross-section of the weld at the beam end and reducing the beam flange size at a certain distance from the beam end Hereinafter referred to as the reinforced deck dog bone node), the plastic hinge at the beam end of the relocation at the same time, the beam and column nodes both have strong bearing capacity, but also have better ductility. ANSYS software was used to conduct the nonlinear finite element analysis under the cyclic load of the four types of nodes, the dog-bone node, the dog-bone node, the cover-reinforced node and the common-type node. The results showed that: Due to the plastic hinge is moved outward, the energy dissipation and ductility of the structure are enhanced, while the bearing capacity and initial stiffness of the node are obviously higher than those of the dog-bone node. Despite the strengthening, but due to a certain distance from the beam end but also appropriate to weaken the beam flange size, do not need to increase the column section, so as to achieve the purpose of saving steel.