Abstract
There are many factors influencing the yield mechanism of "strong column and weak beam", which is not required by the current seismic design of frame structures in earthquakes. In this paper, pushover analysis is done by creating ETABS framework model. Firstly, this paper analyses that cast-in-place floor will increase the stiffness and bearing capacity of frame beams. Then, this paper analyses the amplification factor of frame beam stiffness under combined loads. Finally, this paper achieves the effect of "strong column and weak beam" by controlling the reinforcement at the end of the beam.
Highlights
In building structure, reinforced concrete frame structure system is a kind of structure system which is commonly used at present
The results can be obtained from the analysis of the plastic hinges during large earthquakes occurrence. Both the designed structure and the original structure appear plastic hinge at the end of the column, which belongs to the "column hinge" failure mechanism
The number of plastic hinges at the end of the column decreases greatly, which delays the plastic development of the structure
Summary
In building structure, reinforced concrete frame structure system is a kind of structure system which is commonly used at present. In the seismic design of structures, we require frame structures to achieve "strong columns and weak beams" under earthquake action, which will present a beam hinge ductile structure. In today's stiffness design of slab-to-beam structures, we usually multiply the flexural stiffness of beams by a stiffness amplification factor. Because this method does not consider the thickness and span of the plate, we can not fully consider the contribution of the plate to the beam stiffness. In today's general design software, we set the beam stiffness amplification factor under vertical load conditions. In the whole design process, what we need is the stiffness amplification factor of the beam under combined loads. The stiffness amplification factor of the side beam is as follows
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