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一、概述近年来由于施工技术的发展,大跨度变截面连续梁的采用日渐增多,其经济效果和艺术造型都具有优越性,今后必将大量出现。但在设计当中最感繁琐的是计算工作量太大,由于截面是变化的,其形常数与载常数的处理都十分复杂,过去一些资料虽有过近似处理,但除其精度受限外,计算工作量仍感太多,尤其要用一般的三弯矩方法将需解算很多次三元联立方程式,实在太繁。迄今为止有些资料〔1〕〔2〕虽有数据可查,但也仅适用于矩形截面,而且对沉陷及挠度的计算仍不能应用。现特根据资料〔3〕的I_0/I余图法计算变截面
I. Overview In recent years due to the development of construction technology, the use of large-span continuous beam with variable cross-section has been increasing day by day. Its economic effect and artistic style have advantages and will surely appear in large numbers in the future. However, the most cumbersome in the design is the computational workload is too large, because the cross section is changing, the shape constant and load constant handling are very complex, though some past data have been approximated, but in addition to its accuracy is limited, Calculation of the workload still feel too much, in particular, to use the general method of three moments will need to solve many times ternary simultaneous equations, it is too complicated. Some information so far 〔1〕 〔2〕 Although the data are available, but only for rectangular cross-section, and the calculation of settlement and deflection still can not be applied. Now based on the information [3] I_0 / I diagram method for calculating the variable cross-section