Long-span Continuous Rigid Frame Bridge Temperature Effect And Parameter Analysis Of The High Pier

Hollow thin-wall high piers in the natural environment,due to the nature of their materials,it under the affected by the strong solar radiation or cooling,the surface temperature of the pier structure rising or falling more quickly,and the internal temperature of the hollow pier is changing slowly.So,inside and outside the wall on both sides of the shafts of the formed the uneven temperature difference,it is resulting in temperature stress.Temperature stress in the bridge accounted for a large part of the stress of the bearing structure,it's endangers the normal use of the bridge.Many engineering examples show that because the cause of the temperature stress of the upper structure and the bridge pier,fracture,etc.,makes the bridge in unsafe conditions.So scholars for temperature effect of bridge the study of the problem,in order to better control the negative impact of the temperature effect of the bridge.In this paper,with the help of a few mountains continuous rigid frame bridge of hollow thin-walled high pier temperature measured data,the hollow thin-wall high piers under the sunshine and the corresponding parameters change of temperature effect analysis,the main research results and conclusions are as follows:(1)Thin-wall high piers of temperature field in recent years is introduced and the research status of temperature effect and its parameters analysis,summarized the calculation method of temperature field and the advantages and disadvantages of various methods.(2)The three different cross section forms of thin-wall high piers temperature field measurement,data show that the temperature field distribution of the same.The wall at 22 to8 during the period when the next day,the temperature change is relatively stable,at 10 am,shafts of inside and outside wall gradually appeared larger temperature difference.Because Bridges and wall thickness is different,the direction of the maximum temperature difference of time and maximum temperature difference are difference,with thin-wall high pier cross-section form of different,the temperature influence depth is also different.Hollow thin-wall high piers of sunshine temperature difference of temperature field along the pierheight direction can not be considered,along the thickness direction on the temperature distribution is nonlinear.(3)Using the finite element software MIDAS FEA to the hollow thin-walled pier to carry on the numerical simulation of temperature field,and compared with the measured temperature data are basic,verify the MIDAS FEA to the accuracy of the temperature field analysis of sunlight hollow pier.(4)Using MIDAS FEA software analyzes the wind speed,wall thickness,the trend of the bridge,cross section form used for different parameters,such as hollow thin-wall high piers of sunshine temperature field and the influence of temperature effect.The results show that the wind speed is smaller,the temperature stress and displacement of the pier top of shafts of values;By temperature stress of the wall thickness,the greater the pier and the pier top displacement value is smaller,and the hollow pier location of the maximum tensile and compressive stress also along with the change;Hollow pier of temperature stress and the bridge to a periodic change,within the scope of 0 ° ~ 90 °,the ele vated shafts to bridge temperature stress with the central axis and the vertical Angle increases,and cross the bridge to the temperature stress,within the scope of 0 ° to 45 °,increases with the increase of bridge axis azimuth,peak around 45 °,45 ° ~ 90 ° after drops;Pier cross-section form change,the biggest shafts of tensile and compressive stress value changes,compared with the octagon and rectangular hollow block,solid pier are more prone to concrete tensile damage.