Szewczyk Piotr
Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin, al. Piastów 17, 70-310 Szczecin, Poland.
Materials (Basel). 2024 Sep 13;17(18):4510. doi: 10.3390/ma17184510.
This study analysed the strengthening process of a classical steel-concrete composite beam. The beam consisted of a reinforced concrete slab connected by shear studs to an IPE steel profile. The key idea was that the composite beam was strengthened under load. This process simulated an actual reinforced structure that is always subjected to dead loads, with possible service loads. This study assumed that strengthening was implemented to increase the load-carrying capacity and stiffness, not as a way for simulation a repair. The strengthening consisted of expanding the steel part of the beam by welding an additional plate to the bottom flange of the IPE profile. This study included the results of numerical analyses conducted in Abaqus software and lab results. A three-dimensional numerical model was created, taking into account the non-linear behaviour of concrete and steel, the susceptibility of the composite at the joint plane, and the residual stresses created during welding. A full-scale strengthening of the composite beams under load was carried out. Comparison of the results obtained in the experimental tests and numerical analyses showed a very high convergence of the results, as well as in terms of the non-linear operation of steel and concrete. This confirmed the validity of the created numerical model, which can be the basis for further research into the process of optimal strengthening of composite elements.
本研究分析了经典钢-混凝土组合梁的加固过程。该梁由通过抗剪栓钉连接到IPE钢型材的钢筋混凝土板组成。关键在于组合梁在荷载作用下进行加固。此过程模拟了一个实际的钢筋结构，该结构始终承受恒载，并可能承受活载。本研究假定实施加固是为了提高承载能力和刚度，而非作为一种模拟修复的方式。加固包括通过在IPE型材的底部翼缘焊接一块附加板来扩大梁的钢部件部分。本研究包括在Abaqus软件中进行的数值分析结果和实验室结果。创建了一个三维数值模型，考虑了混凝土和钢材的非线性行为、组合梁在结合面处的敏感性以及焊接过程中产生的残余应力。对荷载作用下的组合梁进行了足尺加固。实验测试和数值分析所得结果的比较表明，结果在很高程度上相互吻合，在钢材和混凝土的非线性性能方面也是如此。这证实了所创建数值模型的有效性，该模型可作为进一步研究组合构件优化加固过程的基础。
