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根据顶推连续梁通常具有等截面、等跨(或中间跨采用等跨径、边跨采用较小跨径)的特征,应用以一次落架思想和力法建立的三弯矩方程组,利用数列及其极限,将顶推分2个阶段推得了顶推中连续梁中间各支点弯矩的解析表达式,借此讨论并揭示了顶推中连续梁中间各支点弯矩值随该连续梁两端支承处弯矩和主梁恒载集度的变化规律。根据顶推前端主梁支点弯矩最小的原则,推得了导梁合理长度的计算公式,借助于数值分析得到:导梁抗弯刚度的合理值应为主梁抗弯刚度的0.2倍。进一步给出了导梁参数取合理值时各控制内力的大小。结合实际工程,阐述导梁常用结构形式与设计原则。
According to the characteristics of thrusting continuous beams, such as constant cross-section, equal span (or equivalent cross-span of middle span and small span of side span), the three-moment equations established by the idea of one- And its limit, deduced the analytical expressions of the bending moment of each fulcrum in the middle of the thrusting in two stages, and discussed and revealed the bending moments of each fulcrum of the continuous beam in thrusting with the two beams End bending moment and the main beam constant load concentration variation. According to the principle that the bending moment of the main beam is the minimum, the formula of the reasonable length of the guide beam is deduced. The numerical analysis shows that the reasonable value of the bending rigidity of the guide beam should be 0.2 times of the bending rigidity of the main beam. The magnitude of each control internal force is also given when the guide beam parameters are reasonable. Combined with the actual project, elaborated the common structure form and design principle of guide beam.