【摘要】 根据积分中值定理,利用时间段中点时间徐变系数推导了有效弹性模量计算公式,以替代传统的老化系数方法;并视徐变应变为强迫应变,推导了节段施工桥梁徐变分析的有限元方法。有限元列式直接用应力的方式给出,以适应桥梁的三维空间有限元的需要。最后通过一座逐跨施工的混凝土连续梁桥算例验证了方法的可行性。更多还原

【Abstract】 In accordance with the intermediate value theorem of integral,the creep coefficients of intermediate point time of incremental time segment are used to derive the formulas for effective elasticity modulus so as to substitute the formulas for the conventional creep aging co-efficient method.The creep strain is then treated as the compulsive strain and the finite element method for creep analysis of the segmental construction concrete bridges is derived.A group of the finite element formulas about creep effect analysis is expressed directly by stress in order to accommodate the need of three-dimensional finite element for the bridges.Eventually,the feasibility of the method recommended above is verified by a calculation example of a concrete continuous girder bridge constructed by span-by-span method.更多还原