宽度深度比和有效长度深度比对无抗剪加固钢筋混凝土细长梁抗剪强度的影响:对比分析

IF 1.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Seyfe Nigussie Adamu, T. W. Aure, T. A. Mohammed
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引用次数: 0

摘要

目的从影响钢筋混凝土(RC)梁抗剪强度的因素出发,本研究探讨了有争议的参数、宽度深度比(b/d)和有效长度深度比(leff/d)对 RC 细长梁抗剪强度的影响。研究人员利用 ACI-DAfStb 数据库中包含 676 项实验测试结果的数据库,进行回归分析以研究 b/d 和 leff/d 比与剪切强度之间的关系,并比较和分析所选 12 个 RC 梁剪切模型对 b/d 和 leff/d 比变化的敏感性。研究结果增加 b/d 比可提高剪切强度,直到 b/d ˜ 3,但进一步增加影响有限,增加 leff/d 比导致剪切强度下降。通过比较分析发现,各种设计标准提供的模型都是安全的,其中 EC-2 和 JSCE 模型较为保守。从考虑的研究模型来看,Campione 和 Arslan 模型比较保守,而 Kim 和 White 模型则不安全。敏感性分析表明 ACI318-19、JSCE、CEB-FIP-90 和 Arslan 模型对 b/d 和 leff/d 比率的变化比较敏感。国家规范模型一般都能很好地捕捉剪切强度特征。某些模型表明,尽管观察到剪切强度有所提高,但 b/d 的影响却在不断减小。大多数模型表明,随着 leff/d 比率的增加,剪切强度也会提高,这与实验结果相反,而 TS500 和 Hwang 模型则与实验结果一致。实际意义本研究的发现对 RC 梁的设计和分析具有实际意义,建议应仔细考虑宽度-深度比和长度-深度比,以优化剪切强度。所确定的模型可帮助工程师根据具体设计方案选择合适的剪切强度预测模型。 社会影响该研究有助于提高钢筋混凝土梁设计领域的知识水平,对结构系统的安全性和可靠性具有重要意义。通过了解剪切强度的影响因素,工程师可以设计出更高效、更坚固的结构,从而确保建筑物和基础设施的安全。原创性/价值这项研究为了解钢筋混凝土梁的宽度深度比和有效长度深度比对剪切强度的影响提供了宝贵的见解。它有助于理解这些因素及其对剪切强度的影响,解决了研究人员之间缺乏共识的问题。剪切模型的比较分析和敏感性分析通过确定更符合实验观察结果的模型而增加了价值。该研究强调了建立考虑到这些因素的精确模型的必要性,并强调了进一步研究以完善和开发改进型预测模型的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of width-to-depth and effective length-to-depth ratio on shear strength of reinforced concrete slender beams without shear reinforcement: comparative analysis
PurposeFrom the factors that affect shear strength of reinforced concrete (RC) beams, the study examines the effect of controversial parameters, width-to-depth (b/d) and effective length-to-depth (leff/d) ratio on shear strength of RC slender beams.Design/methodology/approachThe researchers utilized a database of 676 experimental test results from ACI-DAfStb database, Conducted regression analysis to examine relationship between b/d and leff/d ratios and shear strength, compare and analyze sensitivity to changes in b/d and leff/d ratios for the selected 12 shear models for RC beams.FindingsIncreasing b/d ratio enhanced shear strength until b/d ˜ 3, but further increases had limited impact and increasing leff/d ratio resulted in decreased shear strength. From comparative analysis, the models provided by various design standards were found to be safe, with EC-2 and JSCE models being conservative. From considered research models, Campione and Arslan models were conservative, while Kim and White model were observed to be unsafe. Sensitivity analysis indicated ACI318-19, JSCE, CEB-FIP-90 and Arslan models were sensitive to changes in b/d and leff/d ratios. National code models generally captured shear strength characteristics well. Certain models suggested a constant/decreasing b/d effect despite observed shear strength enhancement. Most models indicated improved shear strength with an increasing leff/d ratio, contrary to experimental findings while TS500 and Hwang models aligned with experimental results.Research limitations/implicationsThe study's limitations include the dependence on the available database, which may not encompass all possible experimental scenarios. Further research should aim to expand the database and investigate additional parameters that may influence shear strength in RC beams.Practical implicationsThe findings of this study have practical implications for the design and analysis of RC beams by suggesting that the width-to-depth and length-to-depth ratios should be carefully considered to optimize shear strength. The identified models can assist engineers in selecting appropriate shear strength prediction models based on specific design scenarios.Social implicationsThe study contributes to the advancement of knowledge in the field of reinforced concrete beam design, which has implications for the safety and reliability of structural systems. By understanding the factors influencing shear strength, engineers can design more efficient and robust structures, ensuring the safety of buildings and infrastructure.Originality/valueThis study provides valuable insights into the influence of the width-to-depth and effective length-to-depth ratios on shear strength in reinforced concrete beams. It contributes to the understanding of these factors and their impact on shear strength, addressing the lack of consensus among researchers. The comparative analysis of shear models and the sensitivity analyses add value by identifying the models that align better with experimental observations. The study emphasizes the need for accurate models that account for these factors and highlights the importance of further research to refine and develop improved predictive models.
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来源期刊
CiteScore
3.70
自引率
5.00%
发文量
60
期刊介绍: Multidiscipline Modeling in Materials and Structures is published by Emerald Group Publishing Limited from 2010
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