Method for determining shear capacity of light ultra-high performance concrete beam

Abstract

The invention discloses a method for determining the shear capacity of a light ultra-high performance concrete beam. The method is characterized by comprising the following steps: testing the sectionwidth, the section effective height and the shear span section length of the LUHPC beam; testing the axial compressive strength, the stirrup yield strength and the stirrup spacing of the concrete; carrying out an LUHPC beam shear test, obtaining the shear bearing capacity of the test beam, studying the influence rule of the shear span ratio and the hooping rate on the LUHPC beam shear bearing capacity, carrying out the nonlinear regression analysis on the LUHPC beam shear bearing capacity through a differential evolution method, and establishing a shear bearing capacity calculation formula ofthe LUHPC beam; and substituting the required data into a calculation formula to obtain the shear capacity of the light ultra-high performance concrete beam. According to the method, the problem thatan existing standard shear capacity formula is not suitable for the LUHPC beam is solved, and technical support is provided for shear design of the LUHPC beam. According to the method, the shear capacity of the LUHPC beam can be accurately determined, and the determination method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of bridge and culvert engineering in the transportation industry, and in particular relates to a method for determining the shear bearing capacity of a lightweight ultra-high-performance concrete beam. Background technique [0002] With the rapid development of my country's economy, cities are expanding day by day, the urban population density is increasing, and the problem of traffic congestion is becoming more and more serious. Urban viaducts and interchange hub projects are an important means of alleviating traffic congestion, but most of the construction sites of urban viaducts are narrow, pollute the environment, and interfere with surrounding buildings and traffic more. The construction method of prefabricated assembly is the development trend of urban bridge construction. It has the advantages of shortened on-site construction time, less environmental pollution, reduced traffic management costs, and r...

AI Technical Summary

Problems solved by technology

However, these studies and results are all based on high-performance concrete. For the new lightweight ultra-high performance concrete material, the research on the shear performance of its application in structures has not yet been carried out, and the shear resistance of lightweight ultra-high performance concrete beams has not yet been obtained. Determination method of carrying capacity

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