Influence of concrete strength grade to the shear behavior of coral aggregate reinforced concrete beam
Influence of concrete strength grade to the shear behavior of coral aggregate reinforced concrete beam
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DOI：
10.1360/n092018-00267
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发表时间：
2018-12
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影响因子：
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通讯作者：
B. Da;Hong-fa Yu;Hai-yan Ma;Haiwei Zhu;Zhangyu Wu;Qiquan Mei
中科院分区：
文献类型：
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作者：
B. Da;Hong-fa Yu;Hai-yan Ma;Haiwei Zhu;Zhangyu Wu;Qiquan Mei
通过试验研究，以混凝土强度等级为参数，研究了钢筋混凝土梁和普通钢筋混凝土梁的裂缝发展、破坏形态、跨中挠度和Vcs，建立了弯矩-跨中挠度、挠度-梁长和荷载-最大裂缝宽度的关系，提出了钢筋混凝土梁Vcs的计算模型。试验结果表明，随着混凝土强度等级的提高，正截面Vcr、斜截面Vcr和Vcs均增大。对于不同强度等级的混凝土，CARCB裂缝宽度随荷载的增加而增加。加载初期，梁跨中出现弯曲裂缝，裂缝发展缓慢。但随着荷载的增加，从支座到集中受力点形成斜裂缝，裂缝迅速扩大，导致梁的破坏。建议在C60 CAC结构中采用有机新涂层钢材，以有效抑制钢材腐蚀。为此，综合考虑了钢筋锈蚀和高强混凝土对钢筋混凝土抗压强度的影响，提出了钢筋混凝土抗压强度的计算模型。
The shear behavior of CARCB and OARCB were tested, the concrete strength grades were selected as parameters, the crack development, failure mode, midspan deflection and V cs were studied, the relationships of bending moment-midspan deflection, deflection-beam length and load-maximum crack width were established, a calculation model for the V cs of CARCB was suggested. The test results showed that the normal section V cr, inclined section V cr and V cs increased with the increase of concrete strength grade. The CARCB crack width increased with the increase of load for different concrete strength grades. In the initial loading stage, flexural cracks occurred at the midspan of the beam with slow development. However, as the load increased, inclined cracks were formed from the support to the concentrated force point, which widened rapidly, leading to beam failure. The application of organic new coated steel in the C60 CAC structure was suggested to effectively inhibit steel corrosion. Therefore, comprehensive consideration on the effects of stirrup corrosion and high-strength concrete on V cs of CARCB, a calculation model for the V cs of CARCB was proposed.