Form-finding Analysis of the Internal-prestressed Reticulated Space Structure Through Posttensioning:Geometrical Displacement-iteration Method

In order to put the internal-prestressed reticulated space structure through posttensioning(IRSSP) into practice,the paper firstly redefined three structure states-zero state,initial state and load state of IRSSP. The geometrical displacement iterative method is then proposed,which is based on the three states mentioned above.A detailed study on the form-finding process is carried out which based on an IRSSP with a long span of 80 m.The result shows that the geometrical displacement iterative method is of high precision,great efficiency and the speed is quite suitable to the form-finding of IRSSP.Furthermore,the method can ensure the integrality of the structure.