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首页> 外文期刊>Bulletin of earthquake engineering >Revisiting flexural overstrength in RC beam-and-slab floor systems for seismic design and evaluation
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Revisiting flexural overstrength in RC beam-and-slab floor systems for seismic design and evaluation

机译：RC梁板地板系统中重新探讨抗弯曲长度，用于地震设计和评估

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摘要

Beam flexural overstrength is an important parameter in seismic design and evaluation of reinforced concrete (RC) moment resisting frames. It affects the column-to-beam flexural strength ratio (CBSR) which is a key parameter to avoid unfavorable column-driven mechanisms. In RC beam-and-slab floors, interaction between beam growth and slab panels is of a very complex nature which significantly alters the beam flexural overstrength. Enhancement of beam flexural capacity in slab floor systems depends on several parameters that should be considered on a case-by-case basis. To include some of the effects that were not considered in previous studies due to physical limitations of experimental works and lack of appropriate computational tools, a generic two-by-two bay archetype story model with a beam-and-slab floor system were considered for further investigations by means of numerical modelling. In order to consider the spatial effects of the floor system, several computational models were assembled by changing the span and cross section of beams in terms of depth, width and reinforcement ratio as well as the thickness of slabs to perform a parametric study on beam flexural overstrength ratio. Multilayer nonlinear shell elements were used for finite element modelling of slab panels to account for the kinematic effects of beam elongation along with the restraining effects of the floor slab. According to the results of analyses, variation of positive and negative flexural overstrength ratios of beams at different performance levels were presented for different parameters. Results demonstrate that the flexural overstrength ratio is greatly affected by the level of chord rotation (beam lateral drift or performance level) reinforcement ratio and the type of connection. However, beam-to-slab flexural stiffness ratio as well as beam length are not overly important parameters for flexural overstrength evaluation. This study reveals that, despite code prescriptions, CBSR should not be considered identical for all cases; hence, it should be revisited based on the desired performance level, type of connection and the beam reinforcement ratio.
机译：光束弯曲超长度是钢筋混凝土（RC）力矩抵抗框架的地震设计和评价中的重要参数。它影响了列光束弯曲强度比（CBSR），其是避免不利的列驱动机制的关键参数。在RC梁和平板地板中，光束生长和板坯板之间的相互作用具有非常复杂的性质，这显着改变了光束弯曲过度的梁。平板地板系统中的光束弯曲容量的增强取决于应逐个案例考虑的几个参数。包括由于实验性工作的身体限制和缺乏适当的计算工具，在先前研究中未考虑的一些效果，并且考虑了具有梁和平板地板系统的通用双架子原型故事模型通过数值建模进一步调查。为了考虑地板系统的空间效果，通过在深度，宽度和增强比以及平板的厚度方面改变梁的跨度和横截面来组装几种计算模型，以对光束弯曲进行参数研究过长比率。多层非线性壳元件用于平板面板的有限元建模，以解释梁伸长率的运动效应以及底板的抑制效果。根据分析结果，针对不同参数呈现了不同性能水平下梁正负弯曲长度的变化。结果表明，弯曲过度比率受到弦旋转水平（梁横向漂移或性能水平）加固率和连接类型的影响大。然而，光束到板状弯曲刚度比以及光束长度对于弯曲过度高度评估而言不是非常重要的参数。本研究表明，尽管代码处方，但除了所有情况下，CBSR不应被视为相同;因此，应根据所需的性能水平，连接类型和光束增强率进行重新求。

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