基于改进修正压力场理论的超高性能混凝土梁受剪承载力分析

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英文篇名：SHEAR CAPACITY ANALYSIS OF ULTRA-HIGH-PERFORMANCE CONCRETE BEAMS BASED ON THE IMPROVED MCFT 作者：梁兴文 ; 王照耀 英文作者：LIANG Xingwen;WANG Zhaoyao;School of Civil Engineering,Xi'an University of Architecture and Technology; 关键词：超高性能混凝土梁 ; 理论分析 ; 销栓作用 ; 修正压力场理论 ; 受剪承载力 英文关键词：ultra-high-performance concrete beams;;theoretical analysis;;dowel action;;modified compression field theory;;shear bearing capacity 中文刊名：GYJZ 英文刊名：Industrial Construction 机构：西安建筑科技大学土木工程学院; 出版日期：2019-01-20 出版单位：工业建筑 年：2019 期：v.49;No.552 基金：国家自然科学基金项目(51278402) 语种：中文; 页：GYJZ201901012 页数：6 CN：01 ISSN：11-2068/TU 分类号：68-73

摘要

为研究超高性能混凝土(UHPC)梁的受剪性能,考虑剪跨比、纵筋配筋率、配箍率和钢纤维体积掺量等影响因素,设计制作了7根UHPC梁,进行受剪性能试验,得到其受剪承载力试验值;采用理论分析方法,得到UHPC梁纵筋销栓力计算模型;以修正压力场理论(MCFT)为基础,考虑纵筋的销栓作用,提出改进的MCFT计算模型。根据试验结果及搜集到的16根UHPC梁受剪性能试验数据,采用改进的MCFT计算模型计算UHPC梁的受剪承载力,计算结果表明:按该计算模型所得的受剪承载力计算值与试验值吻合较好,且变异系数小。
        Seven ultra-high-performance concrete( UHPC) beams were tested to analyze the shear performance of them. The influence of shear-span ratio,longitudinal reinforcement ratio,stirrup ratio and steel fiber content were considered. Existing experimental studies have shown that dowel action should not be ignored when UHPC beams are under shear loading. The analytical model of dowel action of longitudinal reinforcement was established by using theoretical analysis method. Based on the modified compression field theory( MCFT),and taking into account the dowel action,the shear bearing capacity calculation formula of UHPC beam based on the improved MCFT was put forward. According to the test results and collected 16 UHPC beams shear experimental data,the shear capacity was calculated by using the proposed formula based on the improved MCFT. The results showed that the calculated values were in good agreement with the experimental values.

引文

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