Abstract
This article shows results of a numerical study of the behavior of multi-storey reinforced concrete wall-frame structure under loads of special combination, considering seismic impact that corresponds to destructive earthquake. The purpose of the study is to identify conditions that increase energy absorption capacity of wall-frame structure under the effect of destructive earthquakes as well as methods for assessing the energy absorption capacity of wall-frame structure at the design stage. Numerical studies were carried on 9-storey frame building, designed for construction in the area with an estimated seismicity of 7 points. Loads of special combination were applied until the complete exhaustion of the bearing capacity of the structure. The calculations were made using the LIRA software package. Performed studies made it possible to identify and assess bearing capacity margin of buildings designed to meet the requirements of valid antiseismic construction regulations if earthquake intensity exceeds the design calculated value. As a result of a numerical study of the work of a 9-storey frame reinforced concrete building of a frame scheme corresponding to the third version of the system, the building withstood the load exceeding the estimated norm by 30%. The value of the coefficient showing the deformation properties during operation of the system at loads exceeding the calculated values before failure, amounted to K = 3.1. The results obtained give the designer the opportunity to create conditions for the appearance of plastic joints in as many cross sections of frame elements as possible. This in turn leads to an increase in the energy intensity of the skeleton, capable of absorbing the excess energy of a destructive earthquake. We have developed the recommendations for determining bearing capacity margin of buildings at design stage if earthquake intensity exceeds calculated value.
Highlights
For the purpose of this article, destructive earthquakes are earthquakes, which intensity exceeds calculated values established by valid regulations by 1-2 points
The system may take additional external impacts. Such frame system designed for seismic areas should have high energy absorption capacity for unexpected exceeding of earthquake intensity stipulated by the project
The percentage of longitudinal reinforcement of columns was within 0.88-4.52% provided that requirements to minimum and maximum percentage of reinforcement are observed. Frame system with such reinforcement was subject to numerical study on the effects of loads of a particular combination, considering the seismic effects of varying intensity, exceeding the calculated values adopted in the design of these buildings
Summary
For the purpose of this article, destructive earthquakes are earthquakes, which intensity exceeds calculated values established by valid regulations by 1-2 points. It is known that plastic hinge takes place in reinforced concrete structure only if the tension in tensioned reinforcement reaches yield point, and the concrete of the compression area does not lose the bearing capacity Such system should absorb excessive seismic energy in the event of destructive earthquakes. The purpose of our study is to identify conditions that are necessary for the formation of plastic hinges in sections of the elements of reinforced concrete wall-frame structures The fulfillment of these conditions even at the design stage can lead to the increase in the energy intensity of frame systems due to redistribution of forces from overloaded sections to light loaded sections. Authors studied the issues of increasing the bearing capacity of reinforced concrete frame-wall structures due to the formation of the greatest possible number of plastic hinges from external impacts exceeding the calculated values that can occur at destructive earthquakes
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