开孔对空腹梁承载力及挠度影响的试验研究

引用文献:

徐宏广 冯庆兴 端木雪峰 徐铮弢 林皇诚. 开孔对空腹梁承载力及挠度影响的试验研究[J]. 建筑结构,2022,48(06):104-110.

XU Hongguang FENG Qingxing DUANMU Xuefeng XU Zhengtao LIN Huangcheng. Experimental study on the effect of openings on the bearing capacity and deflection of hollow beam[J]. Building Structure,2022,48(06):104-110.

作者:徐宏广 冯庆兴 端木雪峰 徐铮弢 林皇诚
单位:浙江科技学院土木与建筑工程学院 杭州建工集团有限责任公司 中国联合工程有限公司
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
作者简介:徐宏广,硕士,工程师,主要从事钢结构的研究,Email:3369005303@qq.com。冯庆兴,博士,副教授,主要从事空间结构、钢结构的研究,Email:fengqingxing@zust.edu.cn。
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Experimental study on the effect of openings on the bearing capacity and deflection of hollow beam
XU Hongguang FENG Qingxing DUANMU Xuefeng XU Zhengtao LIN Huangcheng
(School of Civil Engineering and Architecture, Zhejiang University of Science and Technology Hangzhou Construction Engineering Group Co., Ltd. China United Engineering Co., Ltd.)
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 6 beams 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 and reduce the deflection when distributing opening from centralized to uniform, or reducing the length to height ratio of the holes, the improvement degree can be up to 1 time with reasonable settings, the most reasonable length to height ratio is about 2. When the length to height ratio of hole is reasonably set and the holes are evenly distributed, the elastic bearing capacity of hollow beam can be estimated according to that of about 90% of solid web beam, the equivalent inertia moment of the hollow beam can be taken as 55%~60% of the theoretical value of the solid web beam for deflection calculation. The joint 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
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