Abstract
In order to study the restoring force characteristics of corroded steel frame beams in an acidic atmosphere, based on different corrosion damage degrees, tests on the material properties of 48 steel samples and six steel frame beam specimens with a scale ratio of 1/2 under low cyclic repeated loading were conducted. According to the test results, the relationship between the weight loss rate and the mechanical properties of corrosion damage steel was obtained by numerical regression analysis, and the hysteresis curves and skeleton curves of the corroded steel frame beams were also obtained. The simplified trilinear skeleton curve model of the corroded steel frame beams and the expression of the corresponding feature points were determined by analyzing the failure process. The strength and stiffness degradation rule of the steel frame beam was analyzed furtherly. The hysteresis rule was established by introducing the cyclic degradation index which considers the effect of different corrosion degrees, and finally the restoring force model based on the corroded steel frame beams in an acidic atmospheric environment was established. Comparison with the test results show that the skeleton curve and the restoring force model established in this paper can accurately describe the seismic performance of corrosion damaged steel frame beams and can provide a basis for the seismic calculation analysis of corroded steel structures in an acidic atmosphere.
Highlights
Owing to an excellent seismic-resistant performance, light weight, and being easy to connect, steel beams are widely used as connecting beams or outer frame beams [1,2,3] in high-rise and super-high-rise hybrid structures
Many restoring force models of steel components were obtained by researchers in recent decades [30,31,32,33], there is little research on the hysteretic behavior of corroded steel frame beams in a harsh environment and cyclic loading, especially in an acidic atmosphere
The intervals are shown in Table 3. of the steel obtained by uniaxial tensile tests after different corrosion intervals are shown in intervals are shown in Table
Summary
Owing to an excellent seismic-resistant performance, light weight, and being easy to connect, steel beams are widely used as connecting beams or outer frame beams [1,2,3] in high-rise and super-high-rise hybrid structures. In order to develop a seismic computation analysis of structures during earthquakes, it is necessary to establish an accurate restoring force model of the structure members that is able to reflect the change of structural mechanical properties, such as the strength and stiffness degradation, and the reduction of ductility or the energy-dissipating capacity during an earthquake. Many restoring force models of steel components were obtained by researchers in recent decades [30,31,32,33], there is little research on the hysteretic behavior of corroded steel frame beams in a harsh environment and cyclic loading, especially in an acidic atmosphere. Based on the above-mentioned introduction, the existing PH models fail to fully consider the characteristics of corroded steel beams and cannot accurately reflect the hysteretic behavior of steel beams in an acid rain environment, since the stiffness and strength degradation are obviously caused by corrosion. The validity of the model was verified by comparing the test results with computational values
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