[论文][Journal] Axial restraint effects on the cyclic performance and elongation behavior of T-shaped RC beams: Experimental and numerical investigations

实干、实践、积累、思考、创新。

师弟陈熹俊发表的一篇论文，轴向约束效应对T形钢筋混凝土梁循环性能及伸长行为影响的试验与数值研究，感兴趣的可以看看。

【英文题目】	Axial restraint effects on the cyclic performance and elongation behavior of T-shaped RC beams: Experimental and numerical investigations 轴向约束对 T 形钢筋混凝土梁循环性能和伸长行为的影响：试验与数值研究
【英文作者】	Xi-Jun Chen ^{a b},Xiao-Lei Han ^{a b},Gui-Rui Lin ^{a b},Jing Ji ^{a b}, Ji-Dong Cui^c
【单位】	^aState Key Laboratory of Subtropical Building and Urban Science, South China University of Technology, Guangzhou, China ^bSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou, China ^cChina Energy Engineering Group Guangdong Electric Power Design Institute Co., Ltd, Guangzhou, China
【Abstract】	To investigate the cyclic performance and axial elongation behavior of T-shaped RC beams under axial restraint, three full-scale specimens with a shear-span ratio of 4 were tested under quasi-static cyclic loading, including one unrestrained specimen and two restrained specimens with low and high axial restraint levels. The results showed that both axial elongation and residual elongation ratio decreased with increasing restraint stiffness, indicating stronger suppression of the unrecoverable residual component than the recoverable geometric component. Beam elongation under restraint generated restraint-induced axial compression, which increased with restraint stiffness and enhanced flexural capacity. The backbone curves exhibited post-yield hardening due to restraint-induced axial compression, together with asymmetric responses caused by slab action, with higher peak lateral loads and more gradual post-peak strength degradation under negative loading. The maximum restraint-induced axial compression reached 576 kN, and the maximum overstrength ratio reached 96%, suggesting that axial restraint may significantly influence beam-end force demands and force redistribution in RC frames. Axial restraint also enhanced lateral stiffness and energy dissipation capacity, with cumulative energy dissipation increasing by 21% and 42% for the low- and high-restraint specimens, respectively. ABAQUS finite-element models were established and validated against the tests, with maximum errors of less than 11% for peak lateral load and 17% for axial elongation. Numerical analyses further indicated that restrained T-shaped beams may be evaluated as compression-bending members for flexural capacity assessment, although this simplification cannot reproduce the full hysteretic response. Further validation is needed to extend these findings beyond the investigated specimens and restraint conditions. 为研究轴向约束下 T 形钢筋混凝土梁的循环性能和轴向伸长行为，进行了 3 个剪跨比为 4 的足尺试件拟静力循环加载试验，包括 1 个无约束试件和 2 个分别具有低、高轴向约束水平的约束试件。结果表明，随着约束刚度增大，轴向伸长和残余伸长率均减小，说明轴向约束对不可恢复残余分量的抑制作用强于对可恢复几何分量的抑制作用。约束条件下梁伸长会产生约束诱导轴压，该轴压随约束刚度增大而增大，并提高梁的受弯承载力。骨架曲线因约束诱导轴压表现出屈服后强化，同时受楼板作用影响呈现不对称响应，负向加载下峰值侧向荷载更高、峰后强度退化更缓。最大约束诱导轴压达到 576 kN，最大超强比达到 96%，表明轴向约束可能显著影响钢筋混凝土框架中的梁端内力需求和内力重分布。轴向约束还提高了侧向刚度和耗能能力，低约束和高约束试件的累计耗能分别增加 21% 和 42%。研究建立了 ABAQUS 有限元模型并通过试验验证，峰值侧向荷载最大误差小于 11%，轴向伸长最大误差小于 17%。数值分析进一步表明，受约束 T 形梁可作为压弯构件进行受弯承载力评估，但该简化方法不能再现完整滞回响应；相关结论仍需在更多试件和约束条件下进一步验证。
【Keywords】	T-shaped RC beam; Beam elongation; Axial restraint; Cyclic loading; Finite-element simulation T形钢筋混凝土梁；梁伸长；轴向约束；循环加载；有限元模拟
【基金资助】	国家自然科学基金（52378515）；广东省科技计划项目（2023A1111120027）
【期刊栏目】	Journal of Building Engineering Date: 1 July 2026 Article: 116860 Volume: Volume 129 Published by