Abstract
The SRC (steel-frame reinforced concrete) arch bridge is an important part of the development of arch bridges. Scholars worldwide have studied it from various aspects because of its stronger stiffness and stability than other types of bridges especially when crossing the canyon. The steel frame is a stress bracket during construction. Concrete becomes the main axial-pressure bearing structure when it fills the inner pipe and the encased frame. This article mainly focuses on the crack problems of SRC arch bridging during the postconstruction operation, local model of the midspan arch rib, and the equivalent relationship between the coefficient of expansion and the temperature of concrete. This study uses a cooling method to simulate the shrinkage process with detailed analysis of three properties including concrete shrinkage, temperature gradients, and concentrated hanger rod force. It is concluded that the SRC arch bridge will have large tensile stress on both inner and outer surfaces of slab and web when the temperature changes, and it is the main cause of cracks. The results agree well with measured data. At last, we come up with some reference suggestions in the design and construction of similar bridges in the future.
Highlights
Arch bridge construction is one of the most common bridging methods, and there is already much research on it from various aspects [1,2,3,4,5]
From the early stone arch to the reinforced concrete arch to the steel arch and steel-concrete composite arch bridge, the most advanced arch bridge construction technology is in China, where the longest span (445 meters) steel-frame reinforced concrete (SRC) arch bridge is built [6,7,8,9]
We mainly use the ANSYS software to simulate the stress state of the SRC arch ribs in the course of construction and analyze the causes of arch rib cracks from three aspects, which are shrinkage and creep from concrete, the temperature gradients in arch rib cross sections, and rod tension. e calculated results are in agreement with the measured results
Summary
Arch bridge construction is one of the most common bridging methods, and there is already much research on it from various aspects [1,2,3,4,5]. From the early stone arch to the reinforced concrete arch to the steel arch and steel-concrete composite arch bridge, the most advanced arch bridge construction technology is in China, where the longest span (445 meters) SRC arch bridge is built [6,7,8,9]. With the continuous improvement of construction materials, construction technology, and design concept, more and more long-span arch bridges have been built both in China and other countries. We mainly use the ANSYS software to simulate the stress state of the SRC arch ribs in the course of construction and analyze the causes of arch rib cracks from three aspects, which are shrinkage and creep from concrete, the temperature gradients in arch rib cross sections, and rod tension. We mainly use the ANSYS software to simulate the stress state of the SRC arch ribs in the course of construction and analyze the causes of arch rib cracks from three aspects, which are shrinkage and creep from concrete, the temperature gradients in arch rib cross sections, and rod tension. e calculated results are in agreement with the measured results
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