| Due to the atmosphere temperature change, the bridge superstructures' thermal deformation exist impersonality which is a fact. Because of the jointless bridges' structural characteristic, the bridge superstructures' thermal deformation would act on the substructures. The bridge substructures' deformation would effect some changes in the superstructures' capability of bearing at the same time. So how to confirm the superstructures' thermal deformation well and truly is the one key of analyse the jointless bridges' loaded properties. Nowadays some researchs which got at home and abroad had indicated that thermal deformation or thermal stress which measure on the bridge superstructures is less than that of academic compute. At the same time, the range of the "effective temperature" in the concrete is connected with the range of the atmosphere temperature, so we must think over the effects which are brought by the volume of concrete and the thermal lag of structure. Therefore how to confirm the superstructures' thermal deformation well and truly; how to make the range of the "effective temperature" in the concrete connected with the range of the atmosphere temperature, compute the "effective temperature" in the concrete base on the range of the local atmosphere temperature, let the computation of thermal deformation of bridges accord with the fact more. All these researches are significance to the design of the jointless bridges. The main contents of the paper are described as follows:â‘ . Base on the experiment, think over the effects of the concrete's volume, thermal gradient, and dry shrink, bring forward a formula which could compute the thermal deformation of concrete bridge and make it accord with the fact.â‘¡. Confirm the scale of the range of the "effective temperature" in the concrete to the range of the atmosphere temperature.â‘¢. Base on the thermal data of T beam, draw the thermal gradients' curves, and get some conclusions.
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