Performance test of flexural capacity of prefabricated UHPC utility tunnel
Aiming at the problems of self-weighting and hoisting difficulty of prefabricated assembled reinforced concrete(RC)utility tunnel,the main structure of ultra-high performance concrete(UHPC)prefabricated assembled utility tunnel was carried out by trial design,and the static test of 1∶2 model was carried out,and the failure form,load-deformation relationship,steel bar and concrete strain of UHPC comprehensive utility tunnel under the action of various levels of load were obtained,and the overall force mechanism,failure mode and ultimate bearing capacity of UHPC comprehensive utility tunnel were analyzed.The results show that the weight of UHPC utility tunnel can be reduced by 30%,and the failure mode is consistent with that of RC utility tunnel,which is bent failure,but the cracking load and deformation ability of UHPC utility tunnel are significantly improved.On the basis of the measured data,by simplifying the stress distribution graph of the tensile pressure zone,the calculation method of UHPC comprehensive utility tunnel bending limit bearing capacity is established,and the calculated value obtained is in good agreement with the measured value,and the error is about 10%.The proposed calculation formula can provide a reference for the design and calculation of UHPC utility tunnel.
万方数据
维普
