Study On Mechanical Behavior Of Thin-Walled C Steel-Bamboo Plywood Composite Slabs

At present,a majority building floor in our country adopt reinforced concrete or steel-concrete composite structure form. These kinds of slabs have the shortcoming of heavy weight, which is a great disadvantage to earthquake resistance. And most injury in an earthquake is caused by the breakdown of these slabs. 5 12 Wenchuan earthquake last year is a profound lesson, awaking us to lighten the slabs once more. Considering that china has the richest bamboo resources in the world, and the bamboo has good mechanical properties, this paper introduces a light, Energy Saving and Environmental Protection composite floor slab made by Thin-walled C steel and bamboo plywood which are stuck together by structural glue.Flexural behavior experimental studies were conducted on three types of the composite slabs:(1) simply stick bamboo plywood and thin-walled C steel by adhesive—non-reinforced composite slabs;(2) not only adhesive but also fastening piece were used for the connections—fastener-reinforced composite slabs; (3) thin-walled C steel were firstly reinforced by sticking bamboo plywood lath on their left and right sides with multiplex agglutinate—thin-walled C steel-reinforced composite slabs. Through this load carrying test, the loading process, failure mode and the feature of Load vs. deformation curves are described, and composite effect, failure mechanism, ability of deform and carrying capacity are analyzed. Some experimental phenomena are: the composite effect of thin-walled C steel and bamboo plywood can be well strengthened by the tapping screws; the thin-walled C steel-reinforced slabs possess superior bearing capacity and stiffness, which can meet the requirements of building floor.Based on the experiment, composite slabs are analyzed theoretically. Within the limit of normal service load, the connections of steel and bamboo are reliable, the service behavior as a whole could be ensured and the steel and the bamboo are elastic. So, the composite slabs under normal service load are treated as elastic members and a formula for calculate deflections of these slabs is proposed. When the composite slabs attain their extreme limit loadings, flange of thin-walled C steels yield. The calculation formulas of load-carrying capacity are presented for different section form. The results achieved by using this formula and the experimental data are in good accordance.By means of the finite element analysis software ANSYS, simulation analysis are done on these slabs. The stress, strain of thin-walled C steel and bamboo plywood, deformation of slab and extreme limit load value under uniform load are obtained. Comparing the simulate result to the experimental result and the analytic value, we see that the three results matched each other very well, which illuminate that element type and gridding partition used in ANSYS model can be used in calculation and analysis of steel-bamboo composite structures similar.