锁口钢管桩抗弯刚度折减行为及其影响因素分析

王硕¹，杨彦军¹，岳祖润²

(1. 同济大学 道路与交通工程教育部重点实验室，上海，201804；2. 石家庄铁道大学 土木工程学院，河北 石家庄，050043)

摘 要：以锁口钢管桩抗弯刚度折减行行为为研究对象，结合既有欧洲规范对抗弯刚度折减行为的定义与对U型钢板桩抗弯刚度折减行为研究，对锁口钢管桩的抗弯刚度折减行为进行有限元分析，并研究钢管桩壁厚、直径与桩长三因素对抗弯刚度折减行为的影响。分析结果表明：锁口连接处摩擦力对锁口钢管桩抗弯刚度折减不产生影响，而冠梁是影响其抗弯刚度折减的重要因素。钢管壁厚与直径越小，置入深度越大，冠梁对抗弯刚度折减的削弱就越强。

关键词：锁口钢管桩；抗弯刚度折减；冠梁；基坑支护

Analysis of reduced modulus action and influence factors in steel pipe sheet piles

WANG Shuo¹, YANG Yanjun¹, YUE Zurun²

(1. Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China;2. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China)

Abstract:Taking the reduced modulus action (RMA) of steel pile sheet piles as the research object, and combing the definition of RMA in Eurocode and the study of RMA in U-section steel sheet piles were combined. The RMA of steel pipe sheet piles was analyzed by finite element method, and the impacts of thickness, diameter and length of the steel piles to RMA were analyzed subsequently. The results indicate that the friction in the interlock does not influence the RMA of the steel pipe sheet piles, however, the capping beam is an important factor for RMA. The reduced modulus decreases along with the increase of thickness and diameter of steel piles and the reduction of pile length.

Key words:steel pipe sheet piles; reduced modulus action; capping beam; excavation support