The Mechanical Characteristics And Selection Analysis Of Highway High Pier In Mountainous Area

With the rapid development of highway in mountainous area,the number of assembly bridge is increasing.Precast girder bridge design should comply with the "advanced technology,safe and reliable,suitable for durable,economic and reasonable,beautiful appearance,favorable environmental protection" principle,and considering adjust measures to local conditions,local materials,convenient for construction and convenient maintenance etc.Mountainous area highway construction,owing to the complicated topography,high and steep mountain,a lot of prefabricated bridge have to across the valley and deep groove,high pier number,the research of this kind of bridge of high piers under various type pier than choose lower stability and seismic performance as prefabricated Bridges unavoidable problems in structure design.Based on airport 2 of luliang city highway bridge as the background,the lower part of the bridge structure under different type pier scheme comparison of strength,stability,and shafts of the seismic performance is analyzed,the main research contents and conclusions are as follows:(1)for the high bridge pier with a height of 60 meters,two options for the hollow piers with double thin wall pier and other sections are selected.(2)using software,Dr Bridge meet hollow pier under the double thin-wall piers schemes are persistent condition bearing capacity limit state of normal section bearing capacity calculation,lasting condition normal use limit state crack width calculation,the calculation results show that the scheme satisfies the "highway reinforced concrete and prestressed concrete bridge and culvert design specifications JTG D62-2004,can further and cross section such as hollow block scheme comparison.(3)using ANSYS,a large general finite element software,to model the two design schemes of high piers,and analyze its elastic stability and elastic-plastic stability.For example,no.6 pier,which has a maximum pier of 93-meter,the stability coefficient of the hollow pier under the double thin-walled pier is 11.11,and the stability coefficient of the hollow pier of the cross-section is 8.31.The stability of the hollow pier in the double thin-walled pier is good.(4)the large general finite element software ANSYS is adopted to establish the three-dimensional dynamic finite element analysis model of the structure,and considering the influence of the adjacent coupling and pile foundation,the influence of such factors as correctly reflect the characteristics of structure and bearing connection characteristics such as coupling effect;The seismic performance of two design schemes of high piers is calculated and analyzed.The results show that the requirement ratio of the piers is about 3~ 5,and the demand ratio of the PWB is higher than that in the vicinity of 2.