论文部分内容阅读
深受弯构件的拉压杆模型已经得到了广泛的认可。为研究混凝土深梁设计中采用的压杆-拉杆模型,进行了简支深梁集中荷载下的模型静载试验。试验设计依据为《混凝土结构设计规范》(GB 50010—2010)中深梁的相关规定及美国《混凝土结构建筑规范》(ACI318M-05)中压杆-拉杆模型设计的相关规定,试验参数为剪跨比、配筋方式等。试验结果表明,深梁混凝土抗压强度软化系数β与剪跨比和分布钢筋配筋率有关;水平分布筋对于承载力的贡献大于竖向分布钢筋。根据试验结果比较,中国规范对于小剪跨比(λ≤1)深梁的设计有较大的安全储备,美国规范深梁设计中所采用的压杆-拉杆模型较为经济合理。
The tension and compression rod model of deep flexural members has been widely recognized. In order to study the compression rod-rod model used in the design of deep concrete beams, the model static load test under the concentrated load of simply supported deep beams was carried out. The experimental design is based on the relevant provisions of the deep beam in “Code for Design of Concrete Structures” (GB 50010-2010) and the relevant provisions of the design of the compression rod-pull rod model in the “Code for Construction of Concrete Structures” (ACI 318M-05). The test parameters are shear Cross ratio, reinforcement methods. The test results show that the softening coefficient β of the compressive strength of deep-beam concrete is related to the shear-span ratio and the distributed reinforcement ratio. The contribution of the horizontal distribution beam to the bearing capacity is greater than that of the vertically distributed reinforcement. According to the comparison of test results, the Chinese code has a large safety margin for the design of deep shear span ratio (λ≤1), and the compression rod-pull rod model used in the US standard deep beam design is more economical and reasonable.