Study On The Method Of Strengthening Stone Arch Bridge With L-shaped Reinforced Concrete Ribs

Supported by Sub-project of national 973 Plan Program, based on the new composite stone arch bridge reinforcement method by using L -shaped concrete ribs put forward by professor Zhixiang Zhou, relied on Fuling Daxi River Bridge in Chongqing City, this paper studied its disease causes, repairing and reinforcement schemes, design calculation methods, construction schemes, arch performances before and after reinforcement and structure late development. The main aspects are as follows:1. Classified and analyzed existing diseases of Chongqing Fuling Daxi River Bridge, summarized its disease causes, checked the bearing capacity by analyzing the main arch internal force through finite element model.2. Analyzed advantages and disadvantages of existing reinforcement methods, calculated both increasing the main arch section and L-shaped concrete rib reinforcement methods, selected the later as the final scheme by comprehensive evaluation of construction technology, feasibility study and structure durability after reinforcement.3. Elaborated construction technology of L-shaped reinforced concrete rib reinforcement method on Daxi River Bridge. Based on the finite element method, analyzed stress states of both new and old structures, internal force distribution, performance of stiffness-degradated stone arch after reinforcement, results demonstrated the feasibility of proposed reinforcement method, coordinate work between the L-shaped rib and old structure, rationality of internal force distribution, significantly improvement of bearing capacity.The study results provide a reference for theoretical research and construction of stone arch bridge reinforcement, and a new idea on existing stone arch bridge reinforcement technology.