考虑畸变时两室薄壁箱梁的约束扭转分析  

Restrained torsion analysis of dual-chamber thin-walled box beam considering distortion

作　　者：胡启平[1] 张默雷 

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038

出　　处：《广西大学学报（自然科学版）》2014年第4期755-759,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：河北省自然科学基金资助项目(E2011402057)

摘　　要：针对目前箱梁桥某些横截面常因较大的畸变作用而产生明显变形,进而严重影响了桥梁的正常使用性能的情况,通过将符拉索夫广义坐标法与哈密顿对偶求解体系结合起来,并采用两端边值问题的精细积分法,求得考虑畸变时两室薄壁箱梁约束扭转问题中截面的翘曲正应力、畸变角及扭转角的高精度数值解,给出了截面的变形图,并通过实例进行了验证。在算例中,该悬臂梁自由端不考虑畸变时的扭转角为0.001 7 rad,与考虑畸变时的扭转角0.036 6 rad相比明显偏小,这就表明在实际工程中考虑畸变是非常必要的。该方法计算简单、适用性强,为结构设计人员提供一种新的分析结构的理论,可方便用于考虑畸变时两室薄壁箱梁约束扭转的计算。Aiming at the situation that the obvious deformation of box girder because of some cross-section distortion seriously affects the normal performance of a bridge, combining the Vlasov general-ized coordinate method and the Hamilton duality solution system, and using the precise integration method for two-point boundary value problems, a high precision numerical solution of the warping normal stress of the cross section was obtained. The distortion angle and twist angle in the restrained torsion of dual-chamber thin-walled box beam considering distortion and the deformation figure of cross section are given, and they were verified by an example. The torsion angle of the cantilever at the free end is 0. 001 7 rad not considering distortion in the case. It is significantly smaller than the torsion angle of 0. 036 6 rad considering distortion. This suggests that distortion should be taken into account in engineering. This method is simple in calculation and has good applicability, which pro-vides a new structure analysis theory for designers, and it can be conveniently used for the calcula-tion of restrained torsion of dual-chamber thin-walled box beams considering distortion.

关 键 词：两室薄壁箱梁 约束扭转 畸变 广义坐标法 哈密顿对偶求解体系 精细积分法 

分 类 号：TU338[建筑科学—结构工程]