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进行了8个钢筋混凝土框架顶层端节点试件的低周反复加载试验。重点研究了梁、柱配置500MPa纵筋的框架顶层端节点,当梁、柱负弯矩钢筋采用带锚固板的不同搭接方案时的抗震性能。试验结果表明:采用带锚固板钢筋梁内搭接方案试件的抗震性能与采用规范GB50010—2002规定的梁内搭接方案试件的抗震性能基本相当,而采用带锚固板柱内搭接方案试件的抗震性能相对较差;与梁正弯矩钢筋采用90°弯折锚固的试件相比,在梁正弯矩钢筋中使用锚固板锚固的试件,其梁筋的滑移量相对要小;试验所用锚固板方案的锚固性能可以满足试件抗震性能的要求。最后给出了带锚固板负弯矩钢筋梁内搭接方案以及使用锚固板锚固的设计建议。
Low-cycle repeated loading tests were carried out on the eight specimens of the top node of reinforced concrete frame. The end nodes of the frame with 500MPa longitudinal reinforcement are arranged on the beams and columns, and the anti-seismic performance of the beams with different bending moment when the negative moment reinforcement is adopted. The test results show that the seismic performance of the specimen with lap joint with anchorage plate is almost the same as that of the specimens with lap joint according to the standard GB50010-2002. However, The seismic performance of specimens is relatively poor. Compared with specimens with 90 ° bending anchorage, the slippage of beam tendons in specimens with anchorage plates in beam-bending moment reinforcement is relatively small. The anchorage performance of the anchoring plate used in the project can meet the requirements of the seismic performance of the specimen. Finally, the design scheme of the bridge with negative moment in anchorage plate and the anchorage of anchorage plate are given.