Seismic Research Of The Edge Joints Of Composite Floor Based On A New Type Of Anti-pull And No-Shearing Connectors

With the development of the steel-concrete composite structure,its excellent mechanical properties are favored by the majority of construction practitioners,but in the process of actual use,the problem that concrete cracks in the negative bending moment area occurs frequently,which seriously affects the normal use of the structure.Academician Nie Jianguo put forward a kind of "putting" idea,and achieved good results by setting anti-pull and non-shear-resistant connectors in the negative bending moment area.In this paper,based on a new type of non-shear-resistant and anti-pull steel plate connectors in the negative bending moment area,the following aspects of research are carried out:(1)Designed a test piece of edge joint of composite floor using anti-pull and no-shearing stud connectors and four test pieces of edge joint of composite floor using anti-pull and non-shear-resistant steel plate connectors.In addition,steel bars and concrete with different properties are used in the post-casting area.Then a vertical low-cycle reciprocating cyclic load is applied in the test.Then analyze the hysteresis curve,strength,stiffness,section strain and cracking of the concrete slabs of the joint,and compare the effects of using different strength steel bars and concrete with different properties on the mechanical properties of the joint;(2)Abaqus was used to simulate one of the joint test specimens using a new type of non-shear-resistant and anti-pull steel plate connectors.The mechanical properties of the joint under monotonic and cyclic loading were analyzed,and the accuracy of the model was verified.After that compare the differences from the hysteresis curve and the damage of the concrete slabs between the joints with ordinary studs and PBL connectors.The main role of the new type of non-shear-resistant and anti-pull steel plate connectors in the structure is further analyzed.(3)Based on the test and finite element results,the effects of the non-shear resistance of the new type of connectors and high-performance concrete on the existing design methods are analyzed,and an improved simplified bearing capacity calculation method under the action of negative bending moment is proposed.