装配式停车楼预应力混凝土双T板静力非线性分析

To achieve rational design of diaphragms and ramps in precast parking structures, the precast concrete topped and un-topped double-tees with the span of 18 m and 24 m were designed and constructed. A series of full-scale experiments, both of flexural behavior under two point loads and shear capacity with shear-span ratio of 3.0, were carried out. The experimental results verified general feasibility of these double-tees to meet the service requirements of multi-storey parking structures. Because it is hard to obtain static performance of double-tees under various loading patterns from limited magnitude of experimental specimens, nonlinear analysis of double-tees members on basis of discrete models was carried out. The analytical results showed that the analyzing load-deformation curves under simulation of experimental loading condition coincided with the experimental curves. Both the flexural behavior of double-tees under uniform loads and shear performance of the double-tees with shear-span ratios ranging from 1.0 to 9.0 were simulated and analyzed. Moreover, a nonlinear finite element model (FEM) of driving or stopping on the local flange region of double-tees was conducted. Combination of these simulation analysis with static loading experiment reflected advantageous performance of the precast prestressed concrete double-tees, including responses of the crack and deflection control, shear and flexural capacities and local bearing capacity. Assembled effectively, these double tees can be applied to the diaphragm and ramps and provide good performance for precast parking structures.