杨再荣 安竹石

摘 要：为了避开拱圈上缘增大截面加固石拱桥破坏拱上建筑原貌的缺点，又能改善拱圈受力特性、提高拱圈承载力，提出了一种石拱桥拱圈增大拱圈截面加固方法。该方法能不仅提高了石拱桥的承载能力、使其继续服役，而且尽可能保留了其原貌。应用有限元分析软件建立模型进行模拟，分析了加固前承载力及加固后承载力。结果表明，从理论上这种增大截面加固方法不仅提高了拱圈承载力，而且没有破坏旧石拱桥的原始面貌。

关键词：加固;增大截面;拱圈;方法

中图分类号：U445.6 文献标识码：A 文章编号：1001-5922（2021）07-0133-04

A New Method of Strengthening Stone Arch Bridge by Enlarging Arch Ring Section

Yang Zairong， An Zhushi

（College of Civil Engineering， Guizhou University， Guiyang 550000， China）

Abstract：In order to avoid the shortcomings of the stone arch bridge with enlarged section on the upper edge of the arch ring to destroy the original appearance of the building on the arch， and to improve the mechanical characteristics of the arch ring and increase the bearing capacity of the arch ring， a reinforcement method of increasing the arch ring section of the stone arch bridge is proposed. This method can not only improve the bearing capacity of stone arch bridge and keep it in service， but also keep its original appearance as far as possible. The finite element analysis software is used to establish the model for simulation， and the bearing capacity before and after reinforcement is analyzed.  The results show that， theoretically， the method of increasing cross-section not only improves the bearing capacity of arch ring， but also does not destroy the original appearance of old stone arch bridge.

Key words：reinforcement; increasing section;arch ring; method

0 引言

在拱桥拱圈上腹部两侧填实土壤或粒料后铺装路面，这种拱桥称为实腹拱桥。石拱桥[1]具有取材方便、造型优美、耐久性强，石材砌体结构是一般实腹式圬工拱桥采用结构，可以将砌体分为料石砌體、毛石砌体，毛石砌体或者料石砌体作为上部结构拱圈、拱上侧墙主要材料，毛石砌体为桥台、桥墩、基础等下部结构主要材料。实腹式圬工拱桥结构用到的主要材料是石材和砂浆，在对实腹式拱桥进行加固时，常用加固方法有增大主拱圈截面面积、提高主拱圈强度、改变结构体系、减轻拱上建筑恒载等。不管是那种方法都对石拱桥的外观或多或少破坏，失去了对其历史价值的保护。灌浆加固技术系指施加一定的压力， 将某种浆液灌入结构或构件内部裂缝中， 以达到封闭裂缝， 提高拱上建筑的整体性， 恢复并提高结构耐久性和抗渗性能的一种修补方法。……