Nonlinear Finite Element Analysis Of Composite Prestressed Steel-Concrete Structure

Base on predecessor theory and experimental study foundation, has carried on the research summary to the composite prestressed steel-concrete structure. This article uses large-scale finite element analysis software, has established two cross prestressed composite continuous beam nonlinear analysis model, and has confirmed the model accuracy through the existing experiment. Again uses the model, through transformation composite beam highly and various steel plates parameter comparative analysis beam and support capacity, stress, deflection change and so on. The synthesis comparison web plate altitude, ledger wall thickness, web plate thickness, kneading board thickness and concrete slab thickness and finally carries on the optimized design analysis to the composite beam.By the article theory and the experimental studying, I got the following conclusion:1. Pre-stressed functions expanded the structure elastic scope, has adjusted the structure stress redistribution, reduced the amount of deflection distortion, enhanced the cracking load and the limited supporting capacity.2. Deflection, the total tendency is under the similar load, along with the web plate high increase, the built-up beam rigidity is increasing, amount of deflection unceasing reducing.3. As the complete shearing force connection design the pre-stressed composite continuous beams, contact surface slipping is very small. In the normal operational phase, it thought right that the compound section works together.4. Influence composite continuous beams stress and deflection each factor from strongly to weak is: web plate high, concrete slab high, web plate thickness, the ledger wall thickness and the roof thickness.5. Regarding different concrete lifting surface thickness: The limited supporting capacity along with the concrete slab thickness increase. The limited supporting capacity is slowly climbing. The degree is small to enhance the limited supporting capacity compared to enhance the web plate high. Therefore it is not advocated to increase the concrete thickness. The amount of deflection in the elastic phase, assumes the linearity to grow, after the elastoplasticity, the growth gradually changes slow. Generally speaking, the concrete slab thickness increase is beneficial in the...