In order to determine the jacking force of middle span closure for the high-pier and long-span continuous rigid frame bridge reasonably, an analytical method for jacking force of continuous rigid frame bridge with single pier under closure sequences is developed based on the force method. Taking the construction work of a three span continuous rigid frame bridge as an example, the jacking force and displacement of the middle span closure are calculated by the analytical method, then numerical simulation method is applied to establish the finite element model. The jacking force and displacement are calculated and compared with the principle of eliminating the horizontal displacement of pier top caused by the five-year shrinkage and creep of concrete and closure temperature difference. Monitoring records in practical engineering have shown that the calculating results by the proposed analytical method are basically the same as those by the finite element method (FEM) and the real measurements, and that the error between calculating results by the analytical method and FEM is less than 10%, which indicates that the analytical method has a relatively high calculation accuracy and can meet the requirement of practical engineering.

high-pier and long-span continuous rigid frame bridge  /  jacking force  /  closure temperature difference  /  shrinkage and creep  /  horizontal displacement of the pier top