(1 浙江科技学院土木与建筑工程学院， 杭州 310023； 2 杭州建工集团有限责任公司， 杭州 310013；3 中国联合工程有限公司， 杭州 310052)

摘要: 空腹梁承载力和挠度受开孔率、抗剪键尺寸、开孔尺寸、孔洞分布、孔洞长高比等诸多因素的影响。 通过改变各影响因素，对 6 根梁进行承载力和挠度试验，并与 ABAQUS 模拟值进行比较。 结果表明:当开孔率相同时，将开孔由集中分布改为均匀分布、减小孔洞长高比对提高空腹梁的承载力和减小挠度效果非常明显，设置合理时，其提高程度可达到 1 倍以上，孔洞长高比取 2 左右为宜；当合理设置孔洞长高比、孔洞均匀分布时，空腹梁的弹性承载力可按实腹梁的 90%左右进行估算，空腹梁的横截面等效惯性矩可取实腹梁理论惯性矩的 55% ~ 60%进行挠度估算；倒角与梁肋交接处为空腹梁的薄弱部位。

关键词: 空腹梁； 承载力； 挠度； 开孔率； 抗剪键； 孔洞长高比

中图分类号:TU392. 1 文献标志码:A 文章编号:1002￣848X(2022)06￣0104￣07

DOI:10. 19701 / j.jzjg.20200149

Experimental study on the effect of openings on the bearing capacity and deflection of hollow beam

XU Hongguang1，2， FENG Qingxing1， DUANMU Xuefeng3， XU Zhengtao1， LIN Huangcheng1

(1 School of Civil Engineering and Architecture， Zhejiang University of Science and Technology， Hangzhou 310023，China； 2 Hangzhou Construction Engineering Group Co.， Ltd.， Hangzhou 310013， China； 3 China United EngineeringCo.， Ltd.， Hangzhou 310052， China)

Abstract: There are many factors that affect the bearing capacity and deflection of hollow beam， including opening ratio，shear key size， opening size， holes distribution， length to height ratio of hole， etc. The bearing capacity and deflection of 6beams were tested by setting various parameters， and the results were compared with the emulation results with ABAQUS.The results show that: when the opening ratio is the same， it’s very effective to improve the bearing capacity of beams andreduce the deflection when distributing opening from centralized to uniform， or reducing the length to height ratio of theholes， the improvement degree can be up to 1 time with reasonable settings， the most reasonable length to height ratio isabout 2. When the length to height ratio of hole is reasonably set and the holes are evenly distributed， the elastic bearingcapacity of hollow beam can be estimated according to that of about 90% of solid web beam， the equivalent inertia momentof the hollow beam can be taken as 55% ~ 60% of the theoretical value of the solid web beam for deflection calculation. Thejoint of the chamfering and the rib is the weak part of hollow beams.

Keywords:hollow beam； bearing capacity； deflection； opening ratio； shear key； length to height ratio of hole第一作者:徐宏广，硕士，工程师，主要从事钢结构的研究，Email:3369005303@ qq.com。

[引用本文] 徐宏广，冯庆兴，端木雪峰，等. 开孔对空腹梁承载力及挠度影响的试验研究[ J]. 建筑结构，2022，52( 6):104￣110. XU Hongguang， FENG Qingxing， DUANMU Xuefeng， et al. Experimental study on the effect of openings onthe bearing capacity and deflection of hollow beam[J]. Building Structure，2022，52(6):104￣110.