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考虑基础刚度的影响对超长结构的温度作用分析非常关键,基础刚度宜以实测刚度为依据,进行合理取值。以某大型步行天桥的温度作用分析为例,根据桩的水平和竖向静载试验,推算了基础的实际刚度,并全面比较了固定支座约束、线性弹簧支座约束、非线性弹簧支座约束时结构的内力状态。结果表明,固定支座约束过分限制了类似核心筒这样刚度很大的构件的变形,改变了结构的温度内力分布状态,与实际情况有很大偏差。讨论了基础刚度取值中一些假定的局限性,对基础刚度的合理取值给出具体建议。
It is very important to consider the effect of foundation stiffness on the temperature effect analysis of the over-long structure. The basis stiffness should be based on the measured stiffness and be reasonably determined. Taking the analysis of the temperature effect of a large pedestrian bridge as an example, the actual stiffness of the foundation is calculated according to the horizontal and vertical static load tests of the pedestal. The constraints of the fixed support, the linear spring support, the nonlinear spring support Constraints when the internal structure of the state. The results show that the restraint of the fixed support limits the deformation of the rigid member such as the core tube excessively and changes the temperature internal force distribution of the structure, which deviates greatly from the actual situation. Some hypothetical limitations of basic stiffness are discussed, and specific suggestions on the reasonable value of basic stiffness are given.