采用常重碎白云石粗骨料全嵌入式 IPE 钢截面的 CCES 柱的有限元数值建模和设计方法

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY International Journal of Concrete Structures and Materials Pub Date : 2024-01-24 DOI:10.1186/s40069-023-00644-x
Mostafa M. A. Mostafa
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引用次数: 0

摘要

混凝土包裹复合钢(CCES)柱构件是由钢截面嵌入并四面包裹在混凝土中制成的。由于复合截面能够承受较重的荷载,同时使用较小的截面,CCES 柱已得到广泛应用。本文介绍了使用不同类型/形状和尺寸的剪力连接器(SC)的碎白云石粗骨料(CDCA)的 CCES 柱在轴向荷载作用下的行为分析研究。本研究还旨在评估当前的设计方法,以确定使用 CDCA 混凝土柱的 CCES 的极限承载能力,该方法使用了九种可用的规范。结果表明,有限元(FE)分析可以准确预测 CCES 柱的极限承载力;当 fcu 增加 60% 时,柱的承载力提高了约 41.75%。提高 IPE 形钢强度(fss)的策略并不十分有效,即使提高了 fss,也会产生脆性行为。随着拉杆箍筋和钢筋比率的增加,柱子的承载力也随之增加。当钢筋比率增加 155.49% 时,柱子的承载力增加了约 17.63%。随着拉杆箍筋的增加,效率系数略有上升,但随着钢筋比率的增加,效率系数略有下降。使用 SCs 系统后,柱子的承载力平均增加了约 4.9%。使用九种可用规范计算出的承载力是保守和安全的。YB9082-06 代码的最接近估计值比测试结果平均低 26%;相比之下,ECP-LRFD 代码的最安全预测值比测试结果平均低 68%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Numerical FE Modeling and Design Methods of CCES Columns with Normal-Weight Crushed Dolomite Coarse Aggregate Fully Embedded IPE Steel-Section

The composite concrete-encased steel (CCES) column member is made by the steel section embedded and covered in concrete from all sides. Due to the ability of the composite sections to bear heavy loads while using smaller sections, CCES columns have been widely used. Analytical studies on the CCES columns’ behavior using crushed dolomite coarse aggregate (CDCA) with different shear connectors (SCs) types/shapes and sizes under axial loads are described here. This study also aims to evaluate the current design methods to determine the ultimate capacity of the CCES with CDCA concrete columns using nine available codes. The results show that the finite element (FE) analysis could accurately predict the ultimate capacity of the CCES columns; the column’s capacity improved by about 41.75% as fcu increased by 60%. Increasing the IPE-shaped steel strength (fss) strategy is not very effective and gives brittle behavior even though enhancing the fss improves the capacity. The column's capacity increased as the tie stirrups and steel bars ratios increased. The column’s capacity increased by about 17.63%, as steel bars ratios increased by 155.49%. The efficiency factors increased slightly as tie stirrups were raised but slightly decreased as steel bar ratios increased. Using the SCs system increases the columns’ capacity by an average value of about 4.9% of the specimen without SCs. The computed capacities using the nine available codes are conservative and safe. The closest estimates made by the YB9082-06 code are 26% less on average than the test results; in contrast, the safest predictions made by the ECP-LRFD code are 68% less, on average, than test results.

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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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