波形钢腹板钢底板混凝土组合梁的挠度分析

Deflection Analysis of Concrete Composite Beam with Corrugated Steel Web and Steel Base Plate

研究目的:为精确分析波形钢腹板钢底板混凝土组合梁在长期荷载作用下的挠度变化,在纳入组合梁剪切变形效应、剪力滞效应及收缩徐变效应对挠度计算影响的基础上,采用能量变分法推导出波形钢腹板钢底板混凝土组合梁的控制微分方程与自然边界条件,得到波形钢腹板钢底板混凝土组合简支单箱双室箱梁分别在跨中集中荷载和满跨均布荷载作用下的挠度计算公式;利用所得公式计算荷载作用7 d、1000 d和3650 d时的挠度值,与ANSYS数值解以及不考虑收缩徐变效应的计算值进行对比,并通过了模型试验结果的验证。研究结论:(1)本文挠度计算值与ANSYS数值解及模型试验结果吻合良好;(2)波形钢腹板钢底板混凝土组合简支箱梁在跨中集中荷载和满跨均布荷载作用1000 d后,跨中挠度分别增大了9.12%和12.94%;(3)在3650 d后,跨中挠度分别增大了14.69%和18.32%,显然收缩徐变效应对组合箱梁挠度计算的影响不可忽略;(4)本文研究可为同类波形钢腹板钢底板混凝土组合梁的挠度计算提供参考。

Research purposes:In order to accurately analyze the deflection change of the waveform steel web and steel base plate concrete composite beams under long-term loading,on the basis of incorporating the effects of sheardeformation effect,shear hysteresis effect and shrinkage creep effect of the composite beams on the calculation of deflection,the control differential equations of the waveform steel web and steel base plate concrete composite beams and the natural boundary conditions were derived by using the energy variational method,and the formula for the deflection calculation of the waveform steel web and steel base plate concrete composite simply-supported single-box and double-compartment box beams were obtained.The deflection formulas of the box girder under centralized load at mid-span and uniform load at full span were obtained,The deflection values at 7 d,1000 d and 3650 d were calculated by using the obtained formulas,which were compared with the numerical solution of ANSYS and the calculated values without considering shrinkage and creep effects,and verified by the results of the model test.Research conclusions:(1)The deflection values in this paper are in good agreement with the ANSYS numerical solution and model test results.(2)The deflection of corrugated steel web steel base plate concrete combined simply supported box girder increased by 9.12%and 12.94%after 1000 d of centralized load in the span and full-span uniform load,respectively.(3)The deflection in the span increased by 14.69%and 18.32%after 3650 d.It is obvious that the effect of shrinkage creep on the deflection calculation of the combined box girder cannot be ignored.(4)This paper provides references for the deflection calculation in the design of the corrugated steel web plate.