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为研究波形钢腹板PC组合箱梁桥顶板在荷载作用下的横向内力及有效分布宽度问题,运用弹性薄板理论,将组合箱梁分解为箱形框架和翼缘板两大部分分别进行分析:将前者展直为四跨连续薄板,将后者简化为一边简支和三边固支的薄板,结合波形钢腹板箱梁,特别是波形钢腹板的受力特点,推导了箱形框架和悬臂翼缘板两部分的内力计算公式,获得这两部分的横向内力结果,利用叠加法得到箱梁顶板的最终横向内力结果。为验证理论的正确性,制作了1根试验梁,进行了3种不同工况下的加载试验,获得了顶板横向应力结果。利用空间有限元法对组合箱梁在局部轮载作用下的受力过程进行了数值仿真分析,采用现行桥梁设计规范有关规定对组合箱梁的有效分布宽度进行对比分析。研究结果表明:箱梁顶板横向应力理论值、试验值、数值结果三者吻合良好,证明了所提出的理论分析方法具有较高的精度;有效分布宽度分析结果表明该方法计算结果偏于安全。
In order to study the transverse internal force and the effective distribution width of roof of PC combined box girder bridge with corrugated steel web under load, the paper analyzes the two parts of composite box girder into box-shaped frame and flange plate using elastic thin plate theory. The former is straightened into four-span continuous thin plate, and the latter is simplified as a thin plate with simple support and three sides fixed. Combined with the force characteristics of the corrugated steel box girder, especially the corrugated steel web, the box-shaped frame And the cantilever flange plate two parts of the internal force formula to obtain the two parts of the results of the horizontal internal force, the use of superposition method to obtain the final box girder roof lateral force results. In order to verify the correctness of the theory, a test beam was made and loaded under three different operating conditions. The horizontal stress of the roof was obtained. The finite element method is used to simulate the process of the composite box girder under local wheel load. The effective distribution width of the composite box girder is compared and analyzed by the relevant provisions of the current bridge design code. The results show that the theoretical value, the experimental value and the numerical result agree well with each other, which proves that the theoretical analysis method proposed has high accuracy. The results of the effective distribution width show that the calculation result of this method is biased towards safety.