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Seismic performance and post-peak behaviour of reinforced concrete beam-column joints.

机译：钢筋混凝土梁柱节点的抗震性能和峰后行为。

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摘要

Reinforced concrete beam-column joints are known as the most critical regions in frame structures since the joints are subjected to both vertical and horizontal shear stresses with magnitude many times higher than those in the adjacent members. The structural behaviour of beam-column joints is very complex due to the interactions between shear, bonding and confining actions. Without proper design considerations, premature failure of beam-column joints may happen, resulting in collapse of the whole structure. The traditional seismic resistant design philosophy states that the joints should remain elastic throughout the loading history; however, joint inelasticity is usually unavoidable under seismic excitation.;In this thesis, an investigation of seismic behaviour and post-peak performance of reinforced concrete exterior beam-column joints is presented. Extensive computational simulations are carried out to study the structural performance of beam-column joints with various design parameters under both reversed cyclic loading and seismic excitations. The parameters of interest include the joint shear reinforcement, column axial load level, beam-to-column depth ratio, column arrangement and beam width. The influences of each parameter to the overall behaviour of specimens and the shear strength of joint are identified clearly based on the simulation results. Furthermore, it can be assumed that the shear resisting mechanism of exterior beam-column joints is composed of three concrete struts resulting from three different actions: the arching action due to the compression forces in beam and columns, bond interaction resulted from the longitudinal bars and confining action provided by the joint horizontal stirrups.;The post-peak behaviour and shear strength degradation of beam-column joints are studied in detail. The trends of shear strength degradation with inter-storey drift ratio and the influences of each parameter are discussed. The post-peak performance of reinforced concrete beam-column joints is evaluated using the shear ductility index which is proposed for quantifying the post-peak behaviour of shear-dominant members.;A theoretical model is developed to model the reinforced concrete elements with bond interactions. This composite model is derived based on the theory of micromechanics to determine the homogenised properties and mechanical responses of the composite element at macroscopic level. The Mori-Tanaka homogenisation scheme is adopted to determine the averaging properties of reinforced concrete composite material. Concrete is modelled by anisotropic damage plasticity model. Steel reinforcement and bond-slippage are modelled by introducing an additional internal variable, which represents the slip strain of reinforcing bars, in the classical plasticity model. The composite model is used to model the exterior beam-column joints. The simulation results show reasonable agreement between the proposed composite model and conventional component-based finite element model.
机译：钢筋混凝土梁柱节点是框架结构中最关键的区域，因为该节点承受的垂直和水平剪切应力的大小比相邻构件的应力大许多倍。由于剪切，粘结和约束作用之间的相互作用，梁柱节点的结构行为非常复杂。如果没有适当的设计考虑，则可能发生梁柱节点的过早破坏，从而导致整个结构坍塌。传统的抗震设计理念指出，接头在整个加载过程中都应保持弹性。然而，在地震激励下，节点的非弹性通常是不可避免的。本文对钢筋混凝土外梁柱节点的抗震性能和峰后性能进行了研究。进行了广泛的计算模拟，研究了在反复循环荷载和地震激励作用下具有各种设计参数的梁柱节点的结构性能。感兴趣的参数包括接缝抗剪钢筋，柱轴向载荷水平，梁与柱的深度比，柱布置和梁宽度。根据仿真结果，可以清楚地识别出每个参数对试样整体性能和接头抗剪强度的影响。此外，可以假定，外部梁柱节点的抗剪机理是由三个不同的作用产生的三个混凝土支杆组成：三个作用是梁和柱中的压缩力引起的拱起作用，纵向钢筋和混凝土的作用引起的粘结相互作用。节点水平箍筋提供的约束作用。;详细研究了梁柱节点的峰值后行为和抗剪强度退化。讨论了层间位移比引起的抗剪强度退化趋势以及各参数的影响。利用剪切延性指数评估钢筋混凝土梁柱节点的峰值后性能，该指标旨在量化剪力支配构件的峰值后行为。;建立了理论模型来模拟具有键相互作用的钢筋混凝土单元。该复合模型是基于微力学理论得出的，以确定宏观上复合元件的均质特性和机械响应。采用森-田中均化方案确定钢筋混凝土复合材料的平均性能。通过各向异性损伤可塑性模型对混凝土进行建模。通过在经典可塑性模型中引入一个附加的内部变量来表示钢筋的滑动和粘结滑移，该变量代表钢筋的滑动应变。复合模型用于对外部梁柱节点进行建模。仿真结果表明，所提出的复合模型与常规的基于构件的有限元模型具有合理的一致性。

著录项

  • 作者

    Luk, Sung Hei.;

  • 作者单位

    Hong Kong University of Science and Technology (Hong Kong).;

  • 授予单位 Hong Kong University of Science and Technology (Hong Kong).;
  • 学科 Civil engineering.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 334 p.
  • 总页数 334
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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