支座沉降对幕墙立柱双跨梁模型的影响

Influence of support settlement on double-span continuous beam model of curtain wall column

考虑支座沉降对幕墙立柱双跨梁模型受力和变形有重要影响。采用解析方法,对双跨梁在均布荷载和支座沉降条件下的内力和挠度进行计算,得到理论求解公式。利用MATLAB软件编制相应的计算程序,与有限元软件ANSYS计算结果进行对比,验证了理论公式的正确性。利用解析解答探讨了各个支座沉降对双跨梁的最大弯矩、最大挠度和其位置的影响。分析结果表明:当短跨跨度与全跨跨度之比α小于0.1时,端支座的沉降增加会引起梁最大挠度和其发生位置的突变,中间支座的沉降增加会引起梁最大弯矩和其发生位置的突变,且α值越小,这种突变越是率先发生且越剧烈。

The support settlement has important influence on the force and deformation of the double-span beam model of the curtain wall column. The internal force and deflection of double-span beam under uniform load and support settlement are calculated by the analytic method,and the theoretical solution formula is obtained. The corresponding calculation program is compiled by using MATLAB software. The correctness of the theoretical formula is verified by compared with the result of the finite element software ANSYS. The influence of the support settlement on the maximum bending moment,maximum deflection and the position of the double-span beam is investigated by the calculation program. The results showed that when the ratio α of short span to full span is less than 0. 1,the increase of settlement of the end support will causes mutation of the maximum deflection of the beam and the position of its occurrence,the increase of settlement of the middle support will cause mutation of the maximum bending moment of the beam and the position of its occurrence. The smaller the value of α,the more the occurrence of this mutation and the more intense.