Study On Seismic Behavior Of Precast Concrete Wall And Beam Joint Of Reinforced Concrete Frame Structure

Two types of structural system commonly used in industrialized building structure are fabricated structure and semi-fabricated structure.Precast reinforced concrete panels are installed on site as part of its exterior envelope system to save time in the two forms.Flexible connection and rigid connection are employed to connect prefabricated external wall and the main structure. Flexible connection adopts shear connector to weaken the link between the wall and main structure, reduce exteral for cein response of earthquake and other horizontal loads, prevent the damage of wall and panels.But it does not have significant influence on structural stiffness. On the other hand, it reduces the contribution that precast wall makes to main structure, causing the waste of material. In rigid connection,beams and embedded reinforcement in precast wall are cast as a whole composite beam.Compared with the flexible connection, it strengthens the link between the wall and main structure, but it also makes the joint prone to damage because of the greater load.It demonstrates that node design is particularly important for rigid connection. Currently there are no relevant standards or technical regulations about the calculation of reinforced the layout and detailing requirements in China. It results in a wide variety of the form of the reinforcement of existing nodes.In order to enhance the performance of prefabricated external wall to resist lateral force, optimized design method of the reinforcement of node is studied,combining the principle of energy dissipation.First the seismic performance of nodes was studied according to test results. A reasonable form of embedded reinforcement was proposed based on the analysis of seismic performance and practical detailing requirements commonly used nowadays. The behavior of this type was simulated and the result indicates that this type has stable cyclic curve. Then a finite element model of one bay frame employing this type of node was studied. It cites that the seismic response of structure would become more moderate by making reasonable use of the lateral-resisting capacity of fabricated external walls, when compared to rigid connection. Rational design and appropriate use of wall stiffness and strength will help to reduce the seismic response.