混凝土框架梁简支弯矩算法研究

发布时间：2018-08-02 13:34

【摘要】：根据《高层建筑混凝土结构技术规程》(JGJ 3—2010)第5.2.3条的规定,在竖向荷载作用下,可对梁端负弯矩乘以调幅系数进行调整,且框架梁跨中截面正弯矩设计值不应小于竖向荷载下按简支梁计算的跨中弯矩设计值的50%。从而高层建筑混凝土结构的框架梁简支弯矩成为截面设计的一项必要参数,由于结构整体计算时框架梁一般为两端刚接,如何计算其简支弯矩是一个值得研究的问题。按照传统方法,该弯矩由结构力学方法计算,忽略其与其他构件的连接关系,依据梁上荷载分布情况,通过简单计算即可获得其弯矩图,导致次梁上的荷载无法传递到框架梁,从而引起计算结果失真。本文提出了一种新的框架梁简支弯矩算法,该方法保持主次梁连接关系不变,采用有限元方法直接进行计算,可准确考虑构件连接关系的影响,确保框架梁简支弯矩的计算符合实际受力情况,并具有较高的计算效率。目前,该方法已集成到北京市建筑设计研究院有限公司自主研发的结构设计软件Paco中,取得了良好的应用效果。
[Abstract]:According to Article 5.2.3 of JGJ 3-2010, under vertical load, the negative moment of beam end can be adjusted by amplitude modulation coefficient. And the design value of the normal moment of the frame beam should not be less than 50 of the design value of the moment in the middle of the span calculated by the simply supported beam under vertical load. Therefore, the simply supported moment of frame beam of high rise building concrete structure becomes an essential parameter in section design. Since the frame beam is usually rigid at both ends in the whole calculation of the structure, how to calculate the simply supported moment of frame beam is a problem worth studying. According to the traditional method, the moment is calculated by the structural mechanics method, and the connection between the moment and other members is ignored. According to the load distribution on the beam, the bending moment diagram can be obtained by simple calculation, resulting in the load on the secondary beam can not be transferred to the frame beam. This results in distortion of the calculation results. In this paper, a new algorithm of simply supported moment of frame beam is proposed. The method keeps the connection relation of primary and secondary beams unchanged, and the finite element method is used to calculate directly, which can accurately consider the influence of the connection relation of members. It is ensured that the calculation of simply supported moment of frame beam accords with the actual stress and has high efficiency. At present, the method has been integrated into the structure design software Paco developed by Beijing Architectural Design and Research Institute Co., Ltd.
【作者单位】：北京市建筑设计研究院有限公司;
【分类号】：TU973.12

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