熊咸玉 戴俊

摘 要：為了对满堂支架进行具体的设计和简化验算，以西安地铁五号线大跨度现浇连续箱梁施工为例，采用经典结构力学理论对满堂支架结构进行稳定性分析，其中箱梁梁体及其上部荷载计算单元运用切割法进行划分，并采用Midas的数值模拟验证切割计算方法的准确性，进一步提出满堂支架施工的控制要点。结果表明：满堂支架竹胶板、纵横向方木强度、刚度、立杆稳定性及地基承载力均在允许范围之内，其横向方木的最大应力为1.164～1.49 MPa，最大挠度为0.011～0.023 mm，纵向方木的最大应力为

5.567～5.57 MPa，最大挠度为0.025～0.026 mm，立杆的最大应力值为102.278～115.98 MPa，满堂支架的整体抗倾覆系数为11.2～37.5，满足规范的要求，且数值模拟的结果与理论分析基本吻合，说明满堂支架具有较好稳定性，切割计算方法

较为准确，具有计算快捷、计算灵活等优点，可为类似工程支架设计、验算及施工提供参考和借鉴。

关键词：满堂支架;大跨度现浇连续箱梁;理论计算;数值模拟;稳定性分析

中图分类号：U 445;U 445.4

文献标志码：A

文章编号：1672-9315（2020）02-0268-07

DOI：10.13800/j.cnki.xakjdxxb.2020.0211开放科学（资源服务）标识码（OSID）：

Stability analysis and evaluation of full-frame support structure

for long-span cast-in-situ continuous box girder

XIONG Xian-yu，DAI Jun

（College of Civil and ArchitecturalEngineering，Xian University of Science and Technology，Xian 710054，China）

Abstract：In order to design and simplify the checking calculation of the full-frame support，taking the construction of large-span Cast-in-situ Continuous Box Girder of Xian Metro Line 5 as an example，the stability analysis of the full-frame support structure is carried out by using classical structural mechanics theory.The box girder and its upper load calculation unit are divided by cutting method，Midas numerical simulation is used to verify the accuracy of the cutting calculation method，and the control points of full support construction are further proposed.The results show that the strength，stiffness，stability of vertical and transverse timber and bearing capacity of foundation are all within the allowable range.The maximum stress of transverse timber is 1.164～1.49 MPa，the maximum deflection is 0.011～0.023 mm，the maximum stress of longitudinal timber is 5.567～5.57 MPa，and the maximum deflection is 0.025～0.026 mm.The maximum stress value of the vertical pole is 102.278～115.98 MPa，and the overall anti-overturning coefficient of the full support is 11.2～37.5，which meets the requirements of the code.The results of numerical simulation are basically consistent with the theoretical analysis，which shows that the full-frame support are good in stability，accurate in cutting calculation method，

fast and flexible in calculation as well as

other advantages.It can provide reference for similar engineering support design，checking calculation and construction.

Key words：full-frame support;large span cast-in-situ continuous box girder;theoretical calculation;numerical simulation;stability analysis

0 引 言

满堂支架法在铁路、公路桥梁中现广泛用于现浇连续梁的施工，其特点是工期短、搭设方便、便于控制、易于拆除[1-4]。对于不同的桥梁施工满堂支架设计有所不同，特别是在大跨度现浇连续梁施工中，满堂支架稳定性要求更高[5-6]。

满堂支架作为现浇混凝土结构施工的重要承载部件和施工作业平台，承担着上部传来的各类施工荷载，其稳定性受到竹胶板、横向方木、纵向方木、立杆的强度、刚度影响，且与地基承载力有关[7-8]。……