大跨高比大跨度钢筋混凝土楼面梁设计与试验

北京金地中心工程塔楼A,B为满足建筑净高要求,采用了跨度为12.245m和10.225m,两端为简支的钢筋混凝土楼面次梁,跨高比分别达到20.4和22.7。介绍了该大跨高比且大跨度楼面次梁的设计。为研究该楼面梁的刚度及开裂性能,进行了足尺构件试验,按有关规范进行了计算。结果表明,该楼面梁的裂缝宽度及挠度均小于规范限值。根据试验结果,对设计和施工提出了有针对性的建议。该工程主体结构已完成施工,未发现其楼面次梁有显著可见的裂缝。

Design and Test of Large Span-to-height Ratio and Large Span RC Floor Beams

To satisfy the clear height requirement,the span-to-height ratios of 20.4 and 22.7 were adopted for the simply supported reinforced concrete secondary floor beams with span of 12.245m and 10.225m respectively for tower A and B of Beijing Goldfield Center.The design of these large span-to-height ratio and large span secondary floor beams is presented.To study the behavior of the secondary beams under the serviceability limit state,field test of a full scale specimen was carried out and calculation was performed according to design codes.The results show that both crack width and vertical deflection can meet the code requirements.Based on the test results,recommendations are presented for design and construction.The structures of tower A and B have been completed and no obvious cracks on the secondary floor beams have been found.