【作者】 郑福聪； 肖云峰； 卢杰志； 张耀庭； 刘勇；

【Author】 Zheng Fucong;Xiao Yunfeng;Lu Jiezhi;Zhang Yaoting;Liu Yong;Huazhong University of Science and Technology,School of Civil Engineering and Mechanics;

【机构】 华中科技大学土木工程与力学学院；

【摘要】 本文针对现浇楼板对预应力混凝土框架梁端抗弯受力的影响进行了研究,采用SAP2000建立了一系列PC框架的分析模型,并结合既有试验验证了建模方法的正确性。通过静力弹塑性分析得到PC框架结构的板内钢筋应力分布情况,讨论了板厚、梁高对于PC框架梁端负弯矩区板内钢筋应力分布及有效翼缘宽度的影响,结果表明,PC框架现浇楼板内的钢筋应力由梁边至远端逐渐减小并呈现曲线分布,且随着梁高的增大、板厚的增大板内钢筋应力逐渐减小,板顶钢筋应力受板厚变化的影响更大,板底钢筋应力受梁高变化的影响更大,梁高和板厚对于PC框架有效翼缘宽度取值的影响较大并呈现一定规律性,并通过线性回归拟合得到了以板厚、梁高为自变量的用于估算PC框架结构梁端负弯矩区有效翼缘宽度取值的经验公式。更多还原

【Abstract】 In this paper,the influence of cast-in-place slab on the bending resistance of PC frame beam is studied.A series of PC framework analysis models are established by SAP2000,and the correctness of the modeling method is verified by the existing experiments.The stress distribution of the steel bars in the PC frame structure was obtained by static elastoplastic analysis.The effects of plate thickness and beam height on the stress distribution and effective flange width of the PC in the negative bending moment of the PC frame beam were discussed.The results show that the stress of the steel bar in the cast-in-place floor slab of the PC frame gradually decreases from the edge to the far end of the beam and presents a curve distribution.As the beam height increases and the plate thickness increases,the stress in the plate decreases gradually,and the stress on the top of the plate is affected.The influence of the variation of the thickness of the plate is greater,and the stress of the steel bar at the bottom of the plate is more affected by the variation of the beam height.The beam height and the thickness of the plate have a great influence on the effective flange width of the PC frame and have a certain regularity.The empirical formula for estimating the effective flange width of the negative bending moment region of the beam end of the PC frame structure is obtained by using the plate thickness and the beam height as independent variables.更多还原