桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2009年
z2期
61-66
,共6页
斜拉桥%桥塔%索塔锚固区%内置式钢锚箱%力学分析%参数分析
斜拉橋%橋塔%索塔錨固區%內置式鋼錨箱%力學分析%參數分析
사랍교%교탑%색탑묘고구%내치식강묘상%역학분석%삼수분석
cable-stayed bridge%pylon%cable-to-pylon anchorage zone%built-in steel anchor box%mechanical analysis%parameter analysis
内置式钢锚箱索塔锚固区模型试验结果表明结构强度足够,但混凝土外端壁和内侧壁均出现裂缝,且外端壁开裂荷载较低.根据索塔锚固区的变形协调关系,分别对矩形和圆形索塔的斜拉索水平分力在钢锚箱与混凝土塔壁之间的分配比例、外端壁和内侧壁的混凝土应力进行理论分析,理论分析结果与试验结果吻合.对矩形和圆形索塔的水平力分配比例和混凝土应力进行参数影响分析,分析结果表明调整索塔长宽比、塔壁厚度比、钢锚箱拉板面积等能改善塔壁混凝土的受力.对相当规模的内置式钢锚箱圆形和矩形索塔锚固区的结构受力性能进行对比分析,结果表明矩形索塔略优于圆形索塔.建议采取措施改善混凝土外端壁局部受力状况.
內置式鋼錨箱索塔錨固區模型試驗結果錶明結構彊度足夠,但混凝土外耑壁和內側壁均齣現裂縫,且外耑壁開裂荷載較低.根據索塔錨固區的變形協調關繫,分彆對矩形和圓形索塔的斜拉索水平分力在鋼錨箱與混凝土塔壁之間的分配比例、外耑壁和內側壁的混凝土應力進行理論分析,理論分析結果與試驗結果吻閤.對矩形和圓形索塔的水平力分配比例和混凝土應力進行參數影響分析,分析結果錶明調整索塔長寬比、塔壁厚度比、鋼錨箱拉闆麵積等能改善塔壁混凝土的受力.對相噹規模的內置式鋼錨箱圓形和矩形索塔錨固區的結構受力性能進行對比分析,結果錶明矩形索塔略優于圓形索塔.建議採取措施改善混凝土外耑壁跼部受力狀況.
내치식강묘상색탑묘고구모형시험결과표명결구강도족구,단혼응토외단벽화내측벽균출현렬봉,차외단벽개렬하재교저.근거색탑묘고구적변형협조관계,분별대구형화원형색탑적사랍색수평분력재강묘상여혼응토탑벽지간적분배비례、외단벽화내측벽적혼응토응력진행이론분석,이론분석결과여시험결과문합.대구형화원형색탑적수평력분배비례화혼응토응력진행삼수영향분석,분석결과표명조정색탑장관비、탑벽후도비、강묘상랍판면적등능개선탑벽혼응토적수력.대상당규모적내치식강묘상원형화구형색탑묘고구적결구수력성능진행대비분석,결과표명구형색탑략우우원형색탑.건의채취조시개선혼응토외단벽국부수력상황.
The results of model test for the cable-to-pylon anchorage zone with built-in steel anchor box indicate that the structural strength of the anchorage zone is sufficient, however, the cracks appear in both the outer end and inner concrete walls of the pylon and the load causing the cracks in the outer end wall is rather low. In accordance with the relationship of deformation coordination in the anchorage zone, the distribution proportion of the horizontal component of stay cables in between the steel anchor boxes and the concrete walls of the rectangular and round pylons and the concrete stress in the outer end and inner walls are respectively theoretically analyzed and it is found that the results of the theoretic analysis well agree with those of the test. The a-nalysis of structural parameter influence is also made for the distribution proportion of the horizontal force and the concrete stress of the two kinds of the pylons. The results show that the adjustment of the length-to-width ratio, wall thickness ratio and the tension plate areas of the steel anchor boxes can improve the mechanical behavior of the concrete of the pylon walls. The comparative analysis further made for the mechanical behavior of the considerable scale anchorage zones with built-in steel anchor boxes of the two kinds of the pylons show that rectangular pylon is slightly superior over the round one and it is proposed that the proper measures should be taken to improve the local force conditions of the concrete end walls.
