Research On Design Of Connector For Precast Concrete Sandwich Panel Based On Strength Theory

Precast Concrete Sandwich Wall Panel is currently has been widely appliedinternationally, As the important element which connect two concrete layers of thepanel, the connector is the key factor which effect on thermal performance andmechanical performance. The concrete rib or steel truss was mainly used before, butthese ways weaken the thermal performance a lot. Therefore it is urgent to developthe research on new type of connector to meet the increasing thermal performancerequirements. The third research content of the sub-program, Research on themanufacture technology of the wall panel and the relevant element as well forassembly building, of Twelve-Five national science and technology support program,The Research and the demonstration of the new precast assembly concrete buildingtechnology, is to study the performance and design method of the Precast concretesandwich wall panel with the different connector. Based on this program The mainresearch is as follows,(1) From the research of three kinds of mechanical model of the PrecastConcrete Sandwich Wall Panel, the testing has been done on the elastic slipping jointof the wall panel, a steel truss is used as an analogue of the frame structure to developa test. In the test, one precast concrete exterior wall cladding panel was installed onthe steel truss, and the connection nodes are designed to be able to slip vertically.Different horizontal forces were exerted on the steel truss to form certain drifts, andthe deformation of panel and the slipping performance of the connection nodes wereexplored. It is found that precast concrete exterior wall cladding panel won’t deformunder the influence of the drifts, while the connection nodes between the framestructure and the panel were found to slip. The results show that the design of slippingconnection node has enough reliability.(2) According to the thermal performance the size, shape, anchor length,section pattern and the material were designed to complete the design and styling ofthe domestic product. The testing has been done to test the thermal performance ofthe four test specimen with different way using different material, section pattern and set ways. The testing result shows that the thermal performance of the nonmetalconnector specimen is the best, and the thermal performance of the steel trussconnector specimen is the worst.(3) Designed two set ways using the three kinds connector which have beenchose according to the previous research, the two set ways mean that metalconnectors set way and nonmetal connectors. The theory analysis, the numericalsimulation and the testing research have been done, and the load-displacement curve,the displacement between the two concrete lays of the wall panel and the limitsupporting capacity has been obtained finally, and the theory model has been testedcorrect.(4) Based on the research results before in this article, the design method withtwo ways to set the connector has been concluded. Take one precast concretesandwich wall panel for example to tell the detail of the design method, Shearingforce non-uniform influence coefficient and tension force non-uniform influencecoefficient has been valued by mechanical calculate method.Finally the design method how to set the connectors in the wall panel isdetermined to make the panel be safe and economic, some advise is given to revisethe code, and put the key problems of the develop research on precast concretesandwich panel’s connectors.