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近年相继出现的单室箱梁公路桥,使某些非常规的受力计算问题,提到设计工作的日程,箱梁畸变是其中之一。在公路直线桥梁中,考察单室梯箱的畸变计算较有代表性。本文就国外介绍的弹性基础梁相似法——一种对畸变进行全桥分析的近似方法,对畸变微分方程的建立,用较为浅近的方法,进行了详细的推演;通过三孔连续箱梁的畸变算例,具体运用该法求解在挂一100作用下,中孔跨中的畸变挠度、内力、应力,说明在桥面较宽、跨度较大的混凝土单箱梁中,畸变横挠应力不容忽视;经过将连续箱梁简化为单孔简支、固端梁,与三孔连续的计算成果进行比较,并简述把简支箱梁的端横隔视为刚性的计算结果,就简化连续、简支箱梁畸变计算的方法与条件提出供讨论的意见,也附带提及了畸变荷载的分解及横隔框架刚度计算中尚待研讨的问题。
In recent years, there have been single-chamber box girder highway bridge, so that some unconventional force calculation problems, referred to the design work schedule, box beam distortion is one of them. In the highway straight bridge, the investigation of single-chamber ladder distortion calculation is more representative. In this paper, we introduce the similar method of elastic foundation girder abroad, which is a kind of approximate method of full-bridge analysis of distortion, and deduce the establishment of the differential equation by using the relatively simple method. Through the three-hole continuous box girder This method is used to solve the distortion, internal force and stress of mid-hole span under the function of hanging one-100, which shows that in the single-girder of concrete with wide bridge deck and large span, the distortion of transverse bending stress can not be tolerated Neglected. After simplifying the continuous box girder into one-hole simply-supported and fixed-end beams, and comparing with the three-hole continuous calculation results, and simply describing the calculation of the end-diaphragm of rigid box girder as rigid, , Methods and conditions for the calculation of the distortion of simply supported box girders are put forward for discussion. Mention is also made about the problems of the decomposition of distortion loads and the calculation of stiffness of diaphragm frames.