（北京中交桥宇科技有限公司， 北京 100020）

［摘要］预应力钢筋混凝土U型梁作为城市轨道交通工程上部结构，具有景观效果好、隔声降噪、安全性高、功能性强、经济性好等特点，但其力学特征复杂。为研究预应力钢筋混凝土U型梁的力学性能，针对其特点，给出了三种竖向静载弯曲试验加载方案：堆载方案、自平衡反力架方案、抗拔桩门式反力架方案，并利用加权平均数理统计理论，对各加载方案从力学性能、安全性、经济性、应用性四个方面进行了综合分析比选，最终选出抗拔桩门式反力架加载方案为最优方案，可为同类项目试验加载方案分析及选定提供参考。

［关键词］预应力钢筋混凝土U型梁； 静载弯曲试验； 加载方案； 堆载； 自平衡反力架； 抗拔桩门式反力架

中图分类号：TU375， U231文献标识码：A文章编号：1002-848X(2019)09-0107-04

Comparison and selection of loading schemes for vertical static load bending tests of prestressed reinforced concrete U-type beams

Wang Xuebo, Yang Liangliang, Li Quanle

(Beijing CCCC Qiaoyu Science and Technology Co., Ltd., Beijing 100020, China)

Abstract:The prestressed reinforced concrete U-type beam, as the superstructure of urban rail transit project, has the characteristics of good landscape effect, sound insulation and noise reduction, high safety, strong function and good economy, but its mechanical characteristics are complex. In order to study the prestressed reinforced concrete U-type beam mechanical properties. Three vertical static load bending test loading schemes of loading scheme, self-balance counterforce frame scheme, anti-pulling pile portal anti-force frame scheme were given. The weighted average mathematical statistics theory was used to analyze and compare the loading schemes from the aspects of mechanical properties, safety, economy and applicability. Finally, the loading scheme of the anti-pulling pile portal anti-force frame scheme was selected as the optimal scheme. It can provide reference for the analysis and selection of similar projects.

Keywords:prestressed reinforced concrete U-type beam; static load bending test; loading scheme; loading; self-balance counterforce frame; anti-pulling pile portal anti-force frame

作者简介：王学博，硕士，高级工程师，Email:444985521@qq.com。