考虑剪切变形及界面滑移的双倒T型组合梁理论模型

张现通 ,  陈建兵 ,  刘聪 ,  田壮言

应用力学学报 ›› 2025, Vol. 42 ›› Issue (6) : 1387 -1396.

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应用力学学报 ›› 2025, Vol. 42 ›› Issue (6) : 1387 -1396. DOI: 10.11776/j.issn.1000-4939.2025.06.018
动力学与控制

考虑剪切变形及界面滑移的双倒T型组合梁理论模型

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Theoretical model of double inverted T-shaped composite beam considering shear deformation and interface slip

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摘要

在钢混组合结构中,由于存在一定的界面滑移及腹板剪切变形,平截面假定不再适用。为科学研究剪切变形及界面滑移对组合梁挠度及界面滑移的影响,通过Goodman假定和Timoshenko梁双广义位移假定,引入组合梁的应变关系和单元微段力学平衡,推导了考虑剪切变形及界面滑移的双倒T型钢-混组合梁弹性弯曲微分方程,并基于等效弹簧模型和等效杆系弹簧模型推导了腹板嵌入式连接件弹性抗剪刚度理论计算式。利用已知的组合梁变形及约束条件,求得简支组合梁在跨中集中荷载作用下的挠度及滑移解析解,并通过4根不同参数的双倒T型钢-混组合梁试验结果进行验证。结果表明:理论计算所得挠度、滑移值与实测值吻合较好,同时验证了腹板嵌入式连接件弹性抗剪刚度理论计算式的正确性;在高跨比为1/10的双倒T型组合梁挠度变形中,弯曲引起的挠度值约为总挠度的56%,界面滑移引起的挠度值约为总挠度的36%,剪切变形引起的挠度值约为总挠度的8%。本研究综合考虑了剪切变形及界面滑移对组合梁挠度及滑移的影响,相比于不考虑剪切变形及界面滑移的模型结构具有明显的改善。

Abstract

In steel-concrete composite structures, due to the existence of certain interface slip and web shear deformation, the assumption of flat section is no longer applicable.In order to scientifically study the effects of shear deformation and interface slip on the deflection and interface slip of composite beams, this paper adopts Goodman's assumption and Timoshenko beam's double generalized displacement assumption, introduces the strain relationship of composite beams and element microsegment mechanical equilibrium, and derives the elastic bending differential equation of double inverted T-shaped steel-concrete composite beams considering shear deformation and interface slip.Then based on the equivalent spring model and the equivalent rod spring model, a theoretical calculation formula for the elastic shear stiffness of the embedded web connection is derived.By using the known deformation and constraint conditions of the composite beam, we obtain the analytical solution of deflection and slip of the simply supported composite beam under concentrated load in the span and verify it through the experimental results of four double inverted T-shaped steel-concrete composite beams with different parameters.The results show that the deflection and slip values obtained from theoretical calculations are in good agreement with the measured values, and the correctness of the theoretical calculation formula for the elastic shear stiffness of the embedded web connection is verified.In the deflection deformation of double inverted T-shaped composite beams, the deflection value caused by bending accounts for about 56% of the total deflection, the deflection value caused by interface slip accounts for about 36% of the total deflection, and the deflection value caused by shear deformation accounts for about 8% of the total deflection.This article comprehensively considers the effects of shear deformation and interface slip on the deflection and slip of composite beams, and makes a significant improvement compared to the model structure that does not consider shear deformation and interface slip.

关键词

双倒T型钢-混组合梁 / 剪切变形 / 弹性抗剪刚度 / 滑移 / 挠度

Key words

double inverted T-shaped steel-concrete composite beam / shear deformation / elastic shear stiffness / deflection / slip

引用本文

引用格式 ▾
张现通,陈建兵,刘聪,田壮言. 考虑剪切变形及界面滑移的双倒T型组合梁理论模型[J]. 应用力学学报, 2025, 42(6): 1387-1396 DOI:10.11776/j.issn.1000-4939.2025.06.018

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基金资助

国家自然科学基金资助项目(No.52208187)

江苏省研究生科研与实践创新计划项目(No.KYCX21_3039)

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