独塔部分地锚式PC斜拉桥边主跨比研究  

Research on side to main span ratio of single pylon partially earthanchored PC cable-stayed bridge

作　　者：赵晓晋 周先功[2] 侯炜 王凌波[2] ZHAO Xiaojin;ZHOU Xiangong;HOU Wei;WANG Lingbo(Shanxi Key Laboratory of Bridge Engineering,Disaster Prevention and Mitigation,Shanxi Transportation Research Instilule,Taiyuan 030006,China;Key Laboratory of Bridge Detection and Reinforcement Technology of the Ministry of Transportation,Highway College,Chang'an University,Xi'an 710064,China)

机构地区：[1]山西省交通科学研究院桥梁工程防灾减灾山西省重点实验室,山西太原030006 [2]长安大学公路学院旧桥检测与加固技术交通行业重点实验室,陕西西安710064

出　　处：《武汉大学学报（工学版）》2020年第9期787-793,共7页Engineering Journal of Wuhan University

基　　金：山西省应用基础研究项目(编号:2018010221217,2018010121165);山西省交通科技计划项目(编号:2019-1-19,2019-2-4);山西省交通科技计划项目(编号:2018-1-20)。

摘　　要：为明确独塔部分地锚式PC斜拉桥合理边主跨比范围,根据斜拉桥主梁轴力计算公式,以恒载作用下主梁轴向受力平衡为条件建立方程,得到了锚碇有效恒载集度与主梁恒载集度比、锚碇与边跨长度比、拉索部分地锚比例等因素与边主跨比的关系。结合经济性能分析,研究总造价随边主跨比及锚碇与边跨长度比的变化规律,得到了独塔部分地锚式斜拉桥的合理边主跨比范围。结果表明:锚碇有效恒载集度与主梁恒载集度比、锚碇与边跨长度比为边主跨比的主要影响因素;边主跨比在0~1范围内均可满足受力要求,考虑经济性能宜取0.365~0.490;若受地形条件限制,锚碇边跨比较小时可取略大于上述范围的值,锚碇边跨比较大时可取略小于上述范围的值,但不应小于0.3。To determine the reasonable variation range of side to main span ratio for single pylon partially earthanchored prestressed concrete(PC)cable-stayed bridges,an equation was established under the condition of the axial force balance of the main beam under constant load,and the relations between side to main span ratio and factors,such as the effective dead load intensity ratio of the anchorage to the main beam,the length ratio of anchorage to side span,and the proportion of partially earth-anchored in cable,were obtained according to the calculation formula of axial force of cable-stayed bridge girder.With the analysis of economic performance and research of variation rules of total cost with respect to side to main span ratio and the length ratio of earth anchor to side span,the reasonable variation range of side to main span ratio for partially earth-anchored single pylon cable-stayed bridges was determined.The results show that the main influencing factors of side to main span ratio are intensity ratio of earth anchor effective load and beam dead load and the length ratio of earth anchor to side span.The ratio of side to main span can meet the stress requirement in the range of 0~1,and 0.365~0.490 is suitable considering the economic performance.Under the restriction of local landform,it is advisable to be slightly greater than the above range when the anchor side span is small and slightly less than the above range when the anchor side span is large,but not less than 0.3.

关 键 词：桥梁工程 边主跨比 数值分析 独塔部分地锚斜拉桥 经济性能 

分 类 号：U442[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]