独塔单索面预应力混凝土斜拉桥静载试验

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发布时间：2021-09-10

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独塔单索面预应力混凝土斜拉桥静载试验
关淑萍，李江林
(浙江华东工程安全技术有限公司，浙江杭州310014)
摘要：为了评定某独塔单索面预应力混凝土斜拉桥结构的受力性能与工作状态，以成桥静
载试验结果为依据，通过对静载试验相关工况下控制截面的斜拉索索力增量、桥塔塔顶偏位、主梁
挠度和截面应力等重要试验数据的详细分析，结合理论计算结果来研究不同静载试验工况下该斜
拉桥的索力变化规律、塔顶偏位、结构强度和刚度等特性。分析结果表明，静力荷载作用下该桥索
力、塔顶偏位、应力和挠度均能满足规范要求，该桥承载能力满足设计要求。
关键词：斜拉桥；独塔；单索面；静载试验；索力；塔顶偏位；挠度；应力
中图分类号：U448．27 文献标志码：A
Static Load Testing of a PC Cable‘·Stayed Bridge
with a Single Pylon and Single Cable Plane
GUAN Shu—ping。LI Jiang—lin
(Zhejiang Huadong Engineering Safety Technology Co．，Ltd．，Hangzhou 310014，China)
Abstract：To assess the mechanical behavior and working conditions of a prestressed concrete
(PC)cable—stayed bridge structure with a single pylon and single cable plane，the results of the
static load testing of the completed bridge of the bridge were taken as the basis，the variation
laws of the stay cable forces and the characteristics of the pylon top displacement，structural
strength and structural rigidity of the bridge under the different load cases for the static load tes—
ting were studied through the detailed analysis of the important testing data，including those of
the stay cable force increment of the controlled section，the pylon top displacement，the deflec—
tion of the main girder and the sectiona1 stress under the load cases and also with reference to the
resuhs of the theoretic calculation． The results of the study demonstrate that under the action of
the static load testing，the stay cable forces，pylon top displacem ent，stress and deflection can all
satisfy the relevant requirements in the codes and the carrying capacity of the bridge can meet the
design requirement as wel1．
Key words：cable—stayed bridge； single pylon； single cable plane；static load testing；cable
force；pylon top displacement；deflection；stress．
1 桥梁概况
某独塔单索面预应力混凝土斜拉桥(图1)采用
塔、梁、墩固结体系，跨径组成为76 m+76 m，总长
152 m。主梁为单箱五室斜腹板截面预应力混凝土
结构，梁高2．5 m，横隔板间距6 m。桥塔为独柱式
钢与混凝土组合结构，外轮廓采用椭圆形截面，塔高
51．6 m。斜拉索采用直径7 mm 的平行钢丝束，全
桥共36根，钢丝标准强度1 860 MPa。主墩采用花
瓶形实体墩，其余桥墩均采用矩形截面实体墩。采
用桩接盖梁轻型桥台、钻孔灌注桩基础。
主桥北侧桥面宽35．0 m，南侧桥面宽26．50 m
(桥面无人行道)，双向4车道。设计荷载为城市A