矩形截面型钢超高性能混凝土梁抗弯承载力
Flexural capacity of steel reinforced ultra-high performance concrete beams with rectangular section
林上顺 1暨邦冲 1刘君平 2林建凡 3赵锦冰4
作者信息
- 1. 福建理工大学土木工程学院,福建福州 350118
- 2. 福州大学土木工程学院,福建福州 350108
- 3. 福建省交通科研院有限公司,福建福州 350004
- 4. 皓耀时代(福建)集团有限公司,福建福州 350002
- 折叠
摘要
为研究矩形截面型钢超高性能混凝土(SRUHPC)梁的抗弯特性,制作了 4根配筋率为0.8％～1.1％,含钢率为8.7％～15.6％,内置型钢分别为一字型、倒T型与H型的矩形截面SRUHPC梁试件,开展了抗弯极限承载力试验,分析了矩形截面SRUHPC梁试件的损伤机理和破坏模式;基于试验结果与理论推导,提出了矩形截面SRUHPC梁抗弯承载力计算方法,计算了21根矩形截面SRUHPC梁试件和111个有限元计算模型的抗弯承载力,并将计算结果与试验值和有限元计算值进行了对比.分析结果表明:矩形截面SRUHPC梁试件的破坏模式均为适筋受弯破坏,即型钢与受拉纵筋先后屈服,随后受压区UHPC被压碎,且型钢与UHPC可较好地共同工作至试件破坏;内置倒T型钢试件和H型钢试件的承载力和刚度高于内置一字型钢试件,且抗裂性能更好;与其他试件相比,内置H型钢试件中纵筋、UHPC与型钢在相同荷载作用下的应变及其发展速度均较小,因此,在矩形截面SRUHPC梁内的型钢中设置上、下翼缘有助于提高组合梁的抗弯性能;采用提出方法得到的计算结果与试验值和有限元计算值的比值均值分别为0.972和1.035,方差分别为0.009和0.002,研究结果可为矩形截面SRUHPC梁在实际工程中的推广应用和规范、规程的制定提供理论支撑.
Abstract
To study the bending resistance characteristics of steel reinforced ultra-high performance concrete(SRUHPC)beams with rectangular section,four SRUHPC beam specimens with rectangular section were fabricated,with the reinforcing ratios ranging from 0.8％to 1.1％and the steel ratios ranging from 8.7％to 15.6％.The embedded steels are I-shaped,inverted T-shaped,and H-shaped.Flexural ultimate capacity tests were conducted to analyze the damage mechanism and failure modes of SRUHPC beam specimens with rectangular section.Based on test results and theoretical derivations,a calculation method for the flexural capacity of SRUHPC beam with rectangular section was proposed.The flexural capacities of 21 SRUHPC beam specimens with rectangular section and 111 finite element calculation models were calculated,and the calculation results were compared with the test and finite element calculation values.Analysis results indicate that the failure modes of SRUHPC beam specimens with rectangular section are all reinforced failures due to bending.The steels and longitudinal tensile reinforcements yield successively,followed by the crushing of the UHPC in the compression zone.The steels and UHPC work well together until the specimens failure.The specimens with embedded inverted T-shaped and H-shaped steels exhibit higher capacities and stiffnesses compared to those with embedded 1-shaped steel,and they demonstrate better crack resistances.Compared with other specimens,under the same load,the strains and strain development rates of longitudinal reinforcements,UHPC,and steels in specimens with embedded H-shaped steels are relatively smaller.Therefore,setting upper and lower flanges in the steel within SRUHPC beam with rectangular section contributes to enhancing the flexural performance of the composite beam.The calculated results obtained by the proposed method show mean ratios of 0.972 and 1.035 compared with the test and finite element calculation values,with variances of 0.009 and 0.002,respectively.The research results can provide theoretical supports for the promotion and application of SRUHPC beams with rectangular section in practical engineering and the formulations of codes and regulations.3 tabs,21 figs,30 refs.
关键词
桥梁工程/型钢超高性能混凝土梁/抗弯承载力/试验/计算方法/刚度/抗裂性能Key words
bridge engineering/steel reinforced ultra-high performance concrete beam/flexural capacity/test/calculation method/stiffness/crack resistance performance引用本文复制引用
基金项目
国家自然科学基金项目(52078136)
福建省交通运输科技项目(202024)
出版年
2024
NETL
NSTL
万方数据