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Numerical modeling of continuous steel concrete composite girders considering cracking of concrete
Structures ( IF 4.1 ) Pub Date : 2020-07-27 , DOI: 10.1016/j.istruc.2020.07.031
Madhusudan G. Kalibhat , Akhil Upadhyay

In continuous steel concrete composite (SCC) girders, the concrete deck is susceptible to cracking because of the negative bending moment, which leads to the redistribution of forces and increases in deformations. The general practice adopted while designing the continuous SCC girder is to ignore the concrete deck in negative moment region and assume the steel girder to resist the entire negative bending moment, which may lead to an uneconomical design. In this regard, a simplified numerical procedure has been proposed, considering concrete cracking effects by aptly modifying the cross-sectional properties of the concrete deck. For this purpose, two different cross-sectional modifiers have been presented. The proposed procedure also incorporates partial shear connection. The proposed simplified numerical procedure is advantageous in terms of flexibility, generality, and the easiness with which it can be adopted in design offices for routine designs of SCC girders. The experimental results available in the literature used to validate the results of the proposed procedure show good agreement. Further, the effectiveness of the proposed procedure is demonstrated with the help of a parametric study. It is observed that a considerable reduction in the negative moment on the steel girder and reduction in deformations of the SCC girder can be achieved by adopting the proposed procedure. An example is solved to illustrate the proposed procedure in the appendix.



中文翻译:

考虑混凝土开裂的连续钢混凝土组合梁的数值模拟

在连续钢混凝土组合(SCC)大梁中,由于负弯矩,混凝土面板容易开裂,这会导致力的重新分配并增加变形。设计连续SCC梁时,通常采用的做法是忽略负弯矩区域的混凝土面板,并假定钢梁抵抗整个负弯矩,这可能会导致不经济的设计。在这方面,已经提出了一种简化的数值程序,其通过适当地改变混凝土面板的截面特性来考虑混凝土的开裂效果。为此,提出了两种不同的横截面改性剂。拟议的程序还包括部分剪力连接。所提出的简化数值程序在灵活性,通用性和易用性方面均具有优势,可以在设计部门中将其用于SCC大梁的常规设计。文献中可用于验证所提出程序结果的实验​​结果显示出良好的一致性。此外,借助参数研究证明了所建议程序的有效性。可以看出,通过采用建议的程序,可以大大减少钢梁上的负力矩,并减少SCC梁的变形。解决了一个示例,以说明附录中建议的过程。文献中可用于验证所提出程序结果的实验​​结果显示出良好的一致性。此外,借助参数研究证明了所建议程序的有效性。可以看出,通过采用建议的程序,可以大大减少钢梁上的负力矩,并减少SCC梁的变形。解决了一个示例,以说明附录中建议的过程。文献中可用于验证所提出程序结果的实验​​结果显示出良好的一致性。此外,借助参数研究证明了所建议程序的有效性。可以看出,通过采用建议的程序,可以大大减少钢梁上的负力矩,并减少SCC梁的变形。解决了一个示例,以说明附录中建议的过程。可以看出,通过采用建议的程序,可以大大减少钢梁上的负力矩,并减少SCC梁的变形。解决了一个示例,以说明附录中建议的过程。可以看出,通过采用建议的程序,可以大大减少钢梁上的负力矩,并减少SCC梁的变形。解决了一个示例,以说明附录中建议的过程。

更新日期:2020-07-27
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