Abstract
An earthquake causes a huge loss of life and property. After an earthquake, many buildings are seriously damaged or collapsed. On the one hand, it is necessary to make full use of nanomaterials technology to improve seismic strength during reconstruction; on the other hand, scientific planning is needed to reduce pollution, carbon emissions, and energy consumption. This paper mainly studies the application of nanomaterial technology in disaster prevention and reconstruction. Through a series of planning safeguard measures, the overall seismic performance of the city is improved in order to provide theoretical guidance and technical support for disaster prevention and reconstruction. This paper mainly introduces the stress analysis of frame joints after earthquake and the planning of urban disaster prevention and reconstruction. In addition to the different types of concrete materials (ordinary concrete, nano silica fiber concrete, PVA fiber concrete), the fixed amount of water, superplasticizer, reinforcement, sand, and gravel, the concrete strength grade is C30. Then, three kinds of concrete frame joints are tested under low cycle cyclic loading to compare the seismic performance of the three kinds of concrete. The experimental results show that the fuzzy evaluation of urban disaster prevention and reconstruction planning has been carried out for 6 communities in this city. Among them, 4 communities are qualified and 2 communities are unqualified. Therefore, it is necessary to focus on seismic reinforcement or carry out urban planning research again. Compared with ordinary concrete, the bearing capacity and ductility coefficient of nano silica fiber concrete and PVA fiber concrete are increased by 37.8% and 15.6%, respectively. It is proved that the seismic performance of nano silica fiber reinforced concrete is far better than that of ordinary concrete.
Highlights
In recent years, Wenchuan earthquake, Yushu earthquake, and other frequent earthquake disasters have accelerated the seismic planning-related research [1,2,3]
The tensile performance of concrete is far lower than its compressive strength performance, and its damage is often characterized by brittleness. e brittleness failure and cracking performance of concrete cannot be brought into full play, which reduces the durability of the structure, shortens the service life of the concrete structure, increases the maintenance cost of the concrete structure, and limits the use of concrete in the structure. erefore, improving the strength and ductility of columns, especially low-rise columns, has become one of the main measures to improve the seismic performance of multistorey buildings
In order to improve the seismic performance of existing RC beam column joints, Vecchio et al proposed a new strength bearing capacity model to explain the strength increase provided by fiber reinforced polymer (FRP) system in seismic reinforcement of lowdetail angle joints. rough the analysis of a large number of experimental data, the accuracy of the model is verified [5]
Summary
Wenchuan earthquake, Yushu earthquake, and other frequent earthquake disasters have accelerated the seismic planning-related research [1,2,3]. In order to improve the seismic performance of existing RC beam column joints, Vecchio et al proposed a new strength bearing capacity model to explain the strength increase provided by FRP system in seismic reinforcement of lowdetail angle joints. The model predictions were compared with recent test results on full-scale beam to column joints with or without FRP reinforcement [6]. E Del Vecchio study evaluates the effectiveness of a new seismic strengthening method for reinforced concrete beam column joints and establishes a shear strength model of the strengthened joints. Verderame et al carried out an experimental study on the fullscale external unreinforced reinforced concrete beam column joints of four typical unqualified reinforced concrete frame structures. The application of nanomaterials technology can improve the level of building science and technology and reduce pollutant emissions and energy consumption, which is one of the important contents of scientific reconstruction
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