基于能量变分理论的简支曲线组合梁变形性能研究

Calculation of Deformation Performance on Simply Supported Composite Beams Based on the Energy Theory

目的对均布荷载下曲线U型钢与混凝土组合梁的变形计算进行研究,以便于实际工程中限定曲线组合梁的变形范围。方法依据能量法,考虑界面滑移影响,建立均布荷载下曲线组合梁的变形公式,并进一步得出不同参数对于曲线梁的变形影响。结果当均布荷载增加时,曲线组合梁的变形随之增大,且变形值与均布荷载大小成正比;圆心角从10°增加到50°,变形值增加了大约44%;混凝土板厚从110mm增加到440mm,变形值降低大约43%;钢梁壁厚从20mm增加到80mm,变形值降低大约58%;连接刚度从0增加到30×10^(4)MPa,变形值降低大约22%。结论不同参数对于曲线组合梁变形的影响程度不同;对于变形有严格要求时,应当在考虑经济效益的同时,优先考虑适当降低圆心角或增加钢梁壁厚。

The deformation of the curved U-shaped steel and concrete composite beam was studied,in order to limit the deformation range of curved composite beams in practical engineering.The deformation formula of the curved composite beam under uniform load was established by using the energy method,considering the influence of interface slip.The influence of different parameters on the deformation of the curved beam was further obtained.When the uniform load increases,the deformation of the curved composite beam increases,and the deformation value is proportional to the uniform load.The deformation value increases by about 44%with the center angle increasing from 10°to 50°;the deformation value decreases by about 43%with the thickness of concrete slab increasing from 110 mm to 440 mm;the deformation value decreases by about 58%with the steel beam wall thickness increasing from 20 mm to 80 mm;and the deformation value decreases by about 22%with the connection stiffness increasing from 0 to 3.0×10^(4)MPa.The effects of parameters on the deformation of curved composite beams are different.When the deformation is strictly required,it should be given priority to reduce the center angle or increase the thickness of the steel beam while considering the economic benefits.