基于改进简化拉-压杆模型的钢纤维混凝土梁柱节点受剪承载力计算方法  

Calculation Method of Shear Capacity of Steel Fiber Reinforced Concrete Beam-column Joints Based on Modified Simplified Softened Strut-and-tie Model

作　　者：张路杨 姚继涛[1,2] 胡玉坤 ZHANG Luyang;YAO Jitao;HU Yukun(School of Civit Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《湖南大学学报（自然科学版）》2024年第1期90-100,共11页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51278401)。

摘　　要：在简化拉-压杆模型(Simplified softened strut-and-tie model,SSSTM)基础上,考虑轴压比对混凝土斜压杆倾角的影响,修正斜压杆倾角计算公式,并基于剪滞模型,考虑裂缝面纤维数量及纤维取向特性,建立裂缝面单位面积纤维拉应力计算公式,从而提出适用于钢纤维混凝土梁柱节点受剪承载力计算的改进简化拉-压杆模型(Modified simplified softened strut-and-tie model,MSSSTM).采用MSSSTM模型、SSSTM模型对36个钢纤维混凝土梁柱节点受剪承载力进行计算.结果表明:MSSSTM模型、SSSTM模型的试验值与计算值之比的平均值分别为1.01、1.05,变异系数分别为0.04、0.09;按照MSSSTM模型计算得到的钢纤维混凝土梁柱节点受剪承载力试验值与计算值吻合较好,离散性较小,且该模型亦能较合理地反映轴压比、混凝土强度等对节点受剪承载力的影响.Based on the simplified softened strut-and-tie model(SSSTM),the calculation formula of the angle of diagonal concrete strut inclination is modified by considering the effect of the axial compression ratio.Based on the shear-lag model,a calculation formula of fiber tensile stress per unit area of the crack surface is established by considering the number of fibers and fiber orientation characteristics of the crack surface.The modified simplified softened strut-and-tie model(MSSSTM)is proposed for the calculation of the shear capacity of steel fiber concrete reinforced beam-column joints.The MSSSTM and SSSTM were used to calculate the shear capacity of 36 steel fiber reinforced concrete beam-column joints.The results show that the average experimental-to-predicted capacity ratios of MSSSTM and SSSTM are 1.01 and 1.05,respectively,and the corresponding coefficients of variation are 0.04 and 0.09,respectively.The calculated values of shear capacity of steel fiber reinforced concrete beam-column joints according to the MSSSTM model are in good agreement with the experimental values with less dispersion.Moreover,the MSSSTM can reflect the influence of axial compression ratio and concrete strength on the shear capacity of joints more reasonably.

关 键 词：改进简化拉-压杆模型 钢纤维混凝土 梁柱节点 受剪承载力 斜压杆倾角 

分 类 号：TU375.4[建筑科学—结构工程]