【摘要】 强化配筋连梁是指采用HRB400及以上钢筋、加密加粗腰筋、加粗箍筋的连梁。期望通过腰筋和箍筋形成的2层或更多层的高强钢筋网片来承受剪力,提高其抗震性能,施工较为方便,适用于小跨高比连梁。利用非线性有限元方法,在已完成普通配筋小跨高比连梁抗震性能试验的基础上,研究了跨高比为1.25的不同配筋形式连梁的抗震性能。研究表明:强化配筋连梁的骨架曲线出现2个峰值,峰值荷载为普通配筋连梁的1.37倍,其荷载下降速率约为普通配筋连梁的39.42%,具有较高的承载力。强化配筋连梁的峰值位移是集中对角斜筋、交叉斜筋和对角暗撑配筋连梁的三倍多,具有较强的变形能力。最后,建议采用深梁的方法计算强化配筋连梁的受剪承载力。更多还原

【Abstract】 Coupling beam with strengthened reinforcement is reinforced by HRB400 or higher strength bar, densified and strengthened crude side bar, and strengthened stirrup. The side bar and the stirrup can form two or more layers high-strength steel grid to bear shear and improve the seismic behavior, and the construction is more convenient, which is applicable for small span-to-depth ratio coupling beam. Based on the existing experimental work on the seismic behavior of the conventional coupling beam with a small span-depth ratio, the nonlinear finite element method was used to study the seismic behavior of the coupling beams with a span-to-depth ratio of 1.25 and various reinforcement details. It is indicated that the coupling beam with strengthened reinforcement has a higher bearing capacity, because there are two peaks on its skeleton curve. Its decline rate of load is approximately 39.42% of that of the conventional coupling beam, while its peak load is 1.37 times. The coupling beam with strengthened reinforcement has a good deformation capability, because the peak displacement is 3 times as large as that of the coupling beam with the concentrated diagonal reinforcement, crossing diagonal reinforcement or diagonal brace reinforcement. It is recommended that the calculation method for the deep beam should be used to calculate shear strength of the coupling beam with strengthened reinforcement.更多还原