دانلود رایگان مقاله انگلیسی رفتار سیستم کابل لنگراندازی از جنس کامپوزیت بتن فولادی - 2018

Abstract

Steel-concrete composite structure is widely applied to bridge engineering due to their outstanding mechanical properties and economic benefit. This paper studied a new type of steel-concrete composite anchorage system for a selfanchored suspension bridge and focused on the mechanical behavior and force transferring mechanism. A model with a scale of 1/2.5 was prepared and tested in ten loading cases in the laboratory, and their detailed stress distributions were measured. Meanwhile, a three-dimensional finite element model was established to understand the stress distributions and validated against the experimental measurement data. From the results of this study, a complicated stress distribution of the steel anchorage box with low stress level was observed. In addition, no damage and cracking was observed at the concrete surrounding this steel box. It can be concluded that the composite effect between the concrete surrounding the steel anchorage box and this steel box can be successfully developed. Consequently, the steel-concrete composite anchorage system illustrated an excellent mechanical response and high reliability.

5. Conclusions

Based on the above investigations, conclusions can be drawn as follows:

• Even if the complex stress distribution at the steel anchorage box is observed in this model test, the stress distribution at each steel plate is relatively uniform due to the constraint effects of the concrete inside this anchorage box. The experimental results generally correlate with the FEA results. The overall stress level of the steel anchorage box is low, which indicates the design of the steel anchorage box is safe and reliable.

• Located at the top surface of each section, the concrete in the anchorage system is under the tensile condition. In contrast, the compressive stress is carried by the bottom of the concrete for each section. No damage and cracking is observed at the concrete surrounding the steel anchorage box. It can be concluded that the composite effect between the concrete surrounding the steel anchorage box and this steel box can be successfully developed. A tiny crack on the top surface of the flange of Section B-B is firstly observed under the load condition 5. It is necessary that proper construction techniques should be adopted to prevent concrete from cracking in actual construction of this bridge.