Method for designing long span concrete beam bridge

Abstract

The invention discloses a method for designing a long span concrete beam bridge, which adopts the principle of monitoring the construction of a diagonal cable bridge and comprises the following design steps: (1) carrying out construction monitoring on a variety of elements affecting the stress and the displacement of the long span concrete beam bridge and obtaining parameter values of the elements; (2) carrying out parameter identification on the obtained parameter values; (3) utilizing parameters passing the identification for carrying out structure re-analysis calculation and pre-stress dynamic adjustment design on the beam bridge; and (4) using actual overload for verifying the dynamic adjustment design. The principle of monitoring the construction of the diagonal cable bridge is introduced in the method, thereby ensuring the construction quality of the bridge, ensuring the safety of the construction process, leading the internal force, the linearity and the like of a finished bridge structure to be in line with specification and design requirements, solving the phenomena of multiple cracks with the width exceeding the limit, non-convergent excessive deflection of midspan and the like after the operation of the existing long span concrete beam bridge, ensuring the bearing capacity of the beam bridge, reducing the imposition of prestressed standby beams, ensuring the normal use and the safety of the bridge and reducing the investment in maintenance capital.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a design method for concrete beam bridges. Background technique [0002] The construction of long-span beam bridges has a profound impact on the entire society and national economic development. Any negligence in the design and construction stages of long-span beam bridges may cause safety hazards in the actual operation of the beam bridge in the future. Accidents, after several years of operation of long-span girder bridges, there will be common safety hazards such as excessive vertical deformation of the main span, cracking of the box girder web, bottom plate, and diaphragm, and these hidden dangers will often reduce the structure of the girder bridge. In order to ensure the normal use and safety of the bridge, the country needs to invest huge sums of money in large-scale maintenance and reinforcement of the beam bridge. When the safety hazard is serious, the beam br...

AI Technical Summary

Problems solved by technology

If these variations occur at the same time, the stress at the lower edge of the span will decrease by about 5MPa. Although the possibility of these variations occurring at the same time is very small, as long as the occurrence reaches 70%, there will be a danger of cracking at the lower edge of the bridge span. Once cracking occurs , the internal forces of the bridge will be redistributed and a new round of creep will occur, causing the cracks to expand sharply and become a major safety hazard

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