论文部分内容阅读
为准确计算多梁式宽幅钢-混凝土组合简支箱梁的活载效应,基于Bredt扭转方程推导了钢-混凝土组合箱梁的抗扭刚度计算公式,研究了偏心压力法、刚接板法2种现行横向分布算方法对于该类桥梁的适用性,并与梁格法以及ABAQUS三维数值仿真的结果进行了对比分析。数值计算结果表明:计算边主梁的活载效应时,修正偏心压力法计算结果与空间实体有限元的结果相比偏于安全;计算中主梁的活载效应时,刚接板法与空间实体有限元结果吻合较好;梁格法也是一种较精确的计算方法。在进行此类桥梁的设计中,采用考虑横向分布系数的半解析算法仍然是可行的。
In order to accurately calculate the live load effect of multi-girder wide-gauge steel-concrete composite box girder, the torsional stiffness formula of steel-concrete composite box girder is derived based on the Bredt torsion equation. The eccentric pressure method, The applicability of the current lateral distribution calculation method for such bridges is compared with that of the beam grid method and ABAQUS numerical simulation. The numerical results show that when calculating the live load effect of the side girders, the results of the modified eccentric pressure method are safer than the results of the space solid finite element method. When calculating the live load effect of the main girder, The results of solid finite element agree well with each other. The beam grid method is also a more accurate method of calculation. In the design of such bridges, it is still feasible to adopt a semi-analytical algorithm that considers lateral distribution coefficients.