The Experimental Study On Coal Unloading Chut With Skew Beam And Its Practical Calculation Method

The development of the electric power business brings forward some new problems to the civil structural design of Thermal Power Plant. The Coal Unloading Chute is a kind of the underground reinforced concrete box structure. The main beam of Coal Unloading Chute being made skew, this kind of structure has been the first time in domestic. The skew beam completely changes the structure's mechanical characteristic. So far there is not yet a calculation method that can be accepted in pubic, which make designer into great trouble in designing this kind of structure. Therefore, it is urgent to do some experimental study to have a full understanding of it. This paper is to study the characteristic of the structure through model test and finite element analysis and puts forward the practical calculation model. The research mainly includes the following respects:First, 1/10 scale reinforced concrete model has been preceded. The load-deflection curve, the load-strain curve, earth pressure and distribution of sub-grade contact pressure under concentrated load, moving load and load at the side of the Coal Unloading Chute respectively are obtained and discussed; the whole process from cracking to failure are studied. Experiment showes that the skew beam has the mechanical characteristic of coupling of bending and torsion. The skew beam has little influence on bottom slab and lateral slab.Second, based on experimental Study and by means of a finite element program named SAP2000, with spring imitating the function of the soil to the construction, 3D elastic analysis has been done. The calculation results of deformation and internal force have been obtained, with which the experimental results are compared.Finally, based on the experimental study and theoretical analysis, with the reference of practical calculation method given by related code of concrete structure in time, the practical calculationmethod and the design suggestion of Coal Unloading Chute with skew beam are brought forward. The method is both reasonable and simple, and the calculated results are in good agreement with that of the experiment. It can serve as reference for engineering design. According to the dynamic response and damage of underground structure, the counter measure of anti- seismic for Coal Unloading Chute is suggested.