【作者】 肖泽荣；

【Author】 XIAO Ze-rong (Fuzhou Planning Design & Research Institute,Fujian,Fuzhou 350003,China)

【机构】 福州市规划设计研究院；

【摘要】 通过对一座异型钢管混凝土拱桥的设计实例分析,表明钢管混凝土异型拱桥的拱肋采用腹腔内不灌注混凝土的横向哑铃型断面是比较合理的,系杆中的预应力钢束及张拉方向应根据系杆轴力从拱头(较陡侧)处向拱尾(较缓侧)处递增的规律进行布置;对拱肋灌注混凝土过程、成桥后的受力状态及稳定进行了初步的分析,分析表明,空钢管在灌注混凝土过程中应在跨径的1/4点和3/4点附近加临时支撑,可以有效的减小拱脚处钢管的应力,通过加强端横梁的刚度和采用横向哑铃型拱肋断面等措施,可以保证钢管混凝土异型拱桥的横向稳定.更多还原

【Abstract】 According to the design example of a special-shaped CFST arch bridge,the paper indicates that it’s reasonable to adopt transverse dumbbell arch fib without concrete filled into the web space for this bridge type.The pre-stressed ropes of tie bar should be layed from ’the steep side to the mild side by increase of axi- al force.The structure behavior and stability during the process of concrete placing and after completing the bridge are primarily analyzed.It is found that temporary braces can be used at one quarter and three quarters of the span during the phrase of concrete placing to decrease the steel tubular stress of the arch spring.The transverse stability of special-shaped CFST arch bridge can be improved by strengthening the end transverse beams and adopting the transverse dumbbell arch rib.更多还原