Experimental Study On Anchorage Performance Of Reinforced Steel At The End Of Superimposed Slabs With Prestressed Steel And Pipe Tubular Truss

With the rapid development of China's economy,in the process of urban construction,the traditional cast-in-place construction technology has a very important position and made a great contribution.However,with the progress of society,the drawbacks exposed by the cast-in-place construction technology are becoming more and more obvious,and the assembled buildings have been paid more and more attention,and have been strongly supported by the state.The superimposed Slabs are the most widely used,and the superimposed slabs with prestressed steel and pipe tubular truss studied by this group has good mechanical performance and overall performance,it has the high bearing capacity and good crack resistance.Without the use of separate templates and support in the construction process and the construction period shortened,the quality has been more effectively controlled because of the prefabricated bottom plate factory design,and the production efficiency has been greatly improved,it becomes more convenient and fast,so the application prospects are relatively broad.At present,the moustache bars reserved in the end of the prestressed steel tube truss laminated floor are the main structural forms of beam-slab joints,but there are many disadvantages in the construction process and in the normal storage of the Hu tendons,which greatly reduce the construction efficiency.The quality of construction will also be affected.In this paper,nine specimens of prestressed steel tube truss laminated plate are tested under static load.Through the comparison of the test results,the mechanical behavior of the end of prestressed steel tube truss laminated plate with indirectly connected steel bars is studied.The factors affecting the end anchoring performance of prestressed steel tube truss laminated plates are analyzed.The experimental results show that the thickness of the laminated layer has a great influence on the mechanical properties and integrity of the laminated surface.It is found that the laminated surfaces of the nine specimens all have different degrees of cracking,and the specimens with the smallest thickness of the laminated layers have the most serious cracking.Therefore,the thickness of the laminated layer shall not be lower than the minimum value of the thickness of the superimposed layer required in the specification.In addition,the test results are divided into three groups.The results show that the ultimate bearing capacity and integrity of the specimens with lower ratio of lapped reinforcement are not as good as those of the other two specimens,and if the reinforcement ratio of the lapped steel bars reaches certain requirements,Then the new type of joint anchoring can replace the Anchorage form of beard bars,but it is found that the tie-in is used in the experiment.The crack of the joint steel bar as the Anchorage form of the specimen is serious,so the lap steel bar has a certain effect on the stress of the composite surface.