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首页> 外文会议>International Conference on Composite Construction in Steel and Concrete; 20040718-23; Mpumalanga(ZA) >COMPONENT-BASED MODELS OF DISSIPATIVE PARTIAL-STRENGTH BEAM-TO-COLUMN COMPOSITE JOINTS
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COMPONENT-BASED MODELS OF DISSIPATIVE PARTIAL-STRENGTH BEAM-TO-COLUMN COMPOSITE JOINTS

机译：基于分量的梁到柱组合截面局部强度模型

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摘要

High ductile composite frame structures can represent a competitive solution in seismic-prone areas if they are endowed with efficient structural solutions. In detail, the introduction of dissipa-tive partial-strength beam-to-column composite joints can lead to the formation of global mechanisms characterized by large inelastic rotations and therefore great amounts of dissipated energy. Monotonic and cyclic tests were conducted on subassemblies at the University of Pisa. The inelastic response of joints was divided mainly between shear yielding of the column web panel and inelastic bending of the extended end plate and column flange. Also yielding of the rebars and concrete crushing of the slab against the column flange took place. In order to guarantee a ductile behavior of partial-strength beam-to-column composite joints, it is needed a suitable capacity design of joint's mechanical components. Nonetheless, mechanical models of composite joints under seismic actions are not fully defined yet and many doubts still exist mainly with regard to strut and tie mechanisms in the reinforced concrete slab governing the force transfer between beam and column. In the paper, mechanical models of interior and exterior beam-to-column joints are presented on the basis of experimental results obtained in monotonic tests, through the analysis and modeling of each component part governing their structural behavior. A preliminary validation of the models is presented and discussed.
机译：如果高延展性复合框架结构具有有效的结构解决方案，则它们可以在地震多发地区提供有竞争力的解决方案。详细地讲，耗散的部分强度梁柱组合节点的引入可以导致以大的非弹性旋转为特征的整体机制的形成，从而导致大量的耗散能量。对比萨大学的组件进行了单调和循环测试。接头的非弹性响应主要分为柱腹板的剪切屈服与延伸端板和柱法兰的非弹性弯曲之间。还发生了钢筋屈服和平板靠柱法兰压碎的情况。为了保证部分强度梁柱组合节点的延性，需要对节点的机械部件进行适当的承载力设计。然而，在地震作用下的复合节理力学模型还没有完全定义，并且仍然存在很多关于钢筋混凝土板中控制梁和柱之间力传递的支撑和连接机制的疑问。本文在单调测试中获得的实验结果的基础上，通过对控制其结构行为的每个组成部分进行分析和建模，给出了内部和外部梁到柱节点的力学模型。提出并讨论了模型的初步验证。

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