Study On Form And Performance Of Rigid Cable Dome Structure

The cable dome is a reasonable and high efficient structure system, however, there are still two problems as follows:first, the form of cable dome structure is still limited in Geiger cable dome and Levy cable dome, some new forms are presented, however, the withdrawal problem of ridge cables, high technical requirement of construction and compression ring with high compression are still existed. Second, the randomness of load and structure itself is not considered in sensitivity analysis of cable dome structure.To solve the first problem, the new conception of rigid cable dome structure with ridge cables replaced with rigid members is presented, uniform design method is proposed to make approximate optimization. The approximate functional relation between results index and design parameters is obtained, and the optimal combination is found. Static and dynamic behavior analysis are finished and obtained the advanced behavior of rigid cable dome comparing with Geiger cable dome and beam string structure.To solve the sceond problem, Monte Carlo method based on orthogonal design response surface is proposed to analyse random reliability sensitivity considering the randomness of load and structure itself. The sensitivity matrix of structural failure is obtained by using Monte Carlo method.Comparing with Geiger cable dome and beam string structure, some conclusions are obtained.Above all, some conclusions are obtained as follows:first, the withdrawal problem of ridge cables is solved by rigid cable dome which has flexible layout.The force and displacement are lower and no mutation in whole loading process. The substructure will not be effected because of the lower force of compression ring. Second, the location of upper nodes is determined after the construction of rigid members, and it brings extremely convenient to tension which is keypoint for the promotion of this advanced structure. Third, the random veriables including prestress level of outermost diagonal cable, load and sectional area of rigid member are more sensitive for Geiger rigid cable dome structural failure.The sensitivity of outermost diagonal cable prestress level for Geiger rigid cable dome is lower than prestress level for corresponding cable dome. The random veriables including sectional area of rigid member, load and elastic modulus of vertical strut are more sensitive for square rigid cable dome structural failure.The sensitivity of prestress level for square rigid cable dome is lower than prestress level for beam string structure.