轻量化预制大悬臂波形腹板盖梁抗弯承载力分析

Analysis of Flexural Bearing Capacity of Lightweight Prefabricated Large-Cantilever Corrugated Steel Web Bent Caps

摘要

为解决传统大悬臂混凝土盖梁自重大、运输与吊装困难及难以实现整体预制装配等工程问题,前期研究已提出一种轻量化预制大悬臂波形钢腹板盖梁结构并完成了弹性阶段足尺模型静力加载试验。现采用 ABAQUS软件建立大悬臂波形钢腹板盖梁结构有限元模型并基于试验结果验证了模型的准确性。在此基础上,分析混凝土强度、预应力筋配筋水平及波形钢腹板厚度等参数对结构抗弯承载力及受力性能的影响规律,并采用现行规范方法对结构抗弯承载力进行验算。研究结果表明:该结构在极限状态下呈现典型受拉控制弯曲破坏模式,具有良好的延性性能;混凝土强度的提升对峰值承载力的增益效果较为有限,当混凝土强度等级从 C50 增加到 C60时,峰值承载力提高2.9%;当混凝土强度等级从 C60增加到 C70时,峰值承载力仅提高1.9%。预应力钢束直径是承载力的主控因素,当钢束直径从12.7mm 增加到17.8mm 时,峰值承载力显著提升14.7%。腹板厚度在满足局部稳定性的前提下对抗弯极限承载力的影响较小,该结构在极限状态下抗弯与抗剪受力机理相对独立。规范验算结果与有限元分析结果对比表明,该类结构抗弯承载力具有约1.34的平均安全系数,计算结果偏于保守且稳定。

Abstract

To address the engineering challenges of traditional large-cantilever concrete bent caps, including excessive self-weight, difficulties in transportation and lifting, and the difficulty in achieving integral prefabricated assembly, a lightweight prefabricated large-cantilever bent cap structure with corrugated steel webs has been proposed in previous study, and a full-scale static loading test in the elastic stage has been completed. In this study, an ABAQUS finite element model of the large-cantilever bent cap structure with corrugated steel webs was established, and its accuracy was validated against the experimental results. On this basis, a parametric analysis was conducted to evaluate the effects of concrete strength, prestressing tendon reinforcement level, and corrugated steel web thickness on the flexural bearing capacity and mechanical performance of the structure. Additionally, the flexural bearing capacity was verified using current design code methods. The research results indicate that under the ultimate state, the structure exhibits a typical tension-controlled flexural failure mode with good ductility. Increasing the concrete strength provides limited enhancement to the peak bearing capacity. When the concrete strength grade increases from C50 to C60, the peak bearing capacity increases by 2.9%, and when it increases from C60 to C70, the capacity only increases by 1.9%. The diameter of the prestressing tendon is the dominant factor controlling the bearing capacity. Increasing the tendon diameter from 12.7 mm to 17.8 mm results in a significant 14.7% enhancement in the peak bearing capacity. Under the premise of satisfying local stability, the web thickness has a minor influence on the ultimate flexural bearing capacity, indicating that the flexural and shear mechanical mechanisms of the structure are relatively independent in the ultimate state. A comparison between the code-based verification results and the finite element analysis results demonstrates that the flexural bearing capacity of this type of structure possesses an average safety factor of approximately 1.34, indicating that the calculation results are conservative and reliable.

关键词

轻量化预制装配盖梁 / 大悬臂盖梁 / 波形钢腹板 / 抗弯性能 / 足尺试验 / 数值仿真模型

Key words

lightweight prefabricated bent caps / large-cantilever bent caps / corrugated steel web / flexural bearing capacity / full-scale test / numerical simulation model

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基金资助

国家自然科学基金面上项目(51778024)

河南省重点研发专项项目(231111241500)

中原科技创新领军人才项目(244200510019)