Creep test device for concrete filled steel tubes considering the initial stress of steel tubes

Abstract

The invention belongs to the technical field of concrete-filled steel tube compression resistance and creep tests and in particular relates to a concrete-filled steel tube creep testing device considering initial stress of the steel tube. The concrete-filled steel tube creep testing device comprises a steel tube initial stress loading device and a lever-type concrete creep loading device, whereinthe steel tube initial stress loading device is arranged on a rigid foundation, a concrete-filled steel tube test block provided with a vibration wire strain gauge is arranged in the steel tube initial stress loading device, the steel tube initial stress loading device is arranged at the lower side of the lever-type concrete creep loading device, a structure capable of applying a loading force isarranged at one end of the lever-type concrete creep loading device, and the other end of the lever-type concrete creep loading device is connected with ground by virtue of a structure with length adjustable. The concrete-filled steel tube creep testing device provided by the invention has the advantages that each part is low in manufacturing and processing difficulty, construction is convenient,materials can be directly selected from a construction site, cost is relatively low, and safety and reliability are realized, so that the concrete-filled steel tube creep testing device provided by the invention has relatively great popularization and application value and a relatively good application prospect.

Description

technical field [0001] The invention belongs to the technical field of steel pipe concrete anti-compression creep test, in particular to a steel pipe concrete creep test device considering the initial stress of steel pipes. Background technique [0002] For long-span concrete-filled steel tube stiff-frame arch bridges located in deep mountain and canyon areas such as Guizhou, there are many inconveniences in the construction of stiff-frame arch bridges using traditional support construction methods. Therefore, the cantilever assembly method or stiff-frame method often becomes the first or must select. The construction method is to erect the steel pipe skeleton first, and then pour concrete relying on the stiff skeleton after the skeleton construction is completed, so as to form the steel pipe concrete arch bridge. Before the concrete in the pipe is poured, developed its strength and bears the load, the steel pipe has already begun to bear the load. The previous research re...

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Problems solved by technology

Among them, the counterweight of the lever method mainly uses cables to connect the counterweight and the loading beam. However, for large-sized counterweights, it is difficult to control the balance of the test device when using hoisting equipment to load the counterweights.

The main disadvantage of the spring loading method is that it needs to gradually increase the load over time, which increases a lot of manpower and material resources.

In addition, existing methods are difficult to apply stress to CFST structures subjected to varying loads.

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