高温后型钢再生混凝土梁的受力性能及承载力计算

发布时间：2018-05-10 16:13

本文选题：型钢混凝土 + 再生混凝土　；参考：《土木工程学报》2016年02期

【摘要】：为了研究高温后型钢再生混凝土梁的受力性能,以温度、再生粗骨料取代率和剪跨比为变化参数,设计32个试件进行高温后的静力加载试验,观察了高温后试件的外观变化和受力破坏形态,获取其荷载-挠度曲线、截面应变分布和极限承载力等重要参数,分析了各变化参数对高温后型钢再生混凝土梁力学性能的影响,并探讨了其极限承载力计算方法。研究结果表明:高温后型钢再生混凝土梁的表面颜色由灰色变暗黄、表面龟裂,受力破坏形态与常温下基本相同;随温度的升高,试件的极限承载力和刚度逐渐降低,延性变差;再生粗骨料取代率的变化对试件的承载力和刚度影响不大,但对延性有一定的影响;随着剪跨比的增大,试件的承载力和刚度降低,延性却更好。
[Abstract]:In order to study the mechanical properties of steel reinforced concrete beams after high temperature, 32 specimens were designed to carry out static loading tests after high temperature with the changing parameters of temperature, replacement ratio of recycled coarse aggregate and shear span ratio. The appearance changes and failure modes of specimens after high temperature were observed, and some important parameters, such as load-deflection curve, cross-section strain distribution and ultimate bearing capacity, were obtained. The influence of various parameters on the mechanical properties of steel reinforced concrete beams after high temperature is analyzed, and the calculation method of ultimate bearing capacity is discussed. The results show that after high temperature, the surface color of steel regenerated concrete beams changes from gray to yellow, the surface cracks, and the failure mode is basically the same as that at normal temperature, and the ultimate bearing capacity and stiffness of the specimens decrease gradually with the increase of temperature. The change of the replacement ratio of recycled coarse aggregate has little effect on the bearing capacity and stiffness of the specimen, but has a certain effect on the ductility; with the increase of the shear span ratio, the bearing capacity and stiffness of the specimen decrease, but the ductility is better.
【作者单位】：广西大学土木建筑工程学院;广西大学工程防灾与结构安全教育部重点实验室;
【基金】：国家自然科学基金(51268004;51578163) “八桂学者”建设工程专项经费广西自然科学基金(2013GXNFSFDA019025)
【分类号】：TU398.9

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