钢筋钢纤维混凝土梁与钢筋混凝土梁抗火性能试验及对比分析
TU352.5%TU398; 为了研究钢筋钢纤维混凝土梁在高温下的抗火性能,对截面尺寸和配筋均相同的钢筋钢纤维混凝土梁和普通钢筋混凝土梁开展了抗火试验和有限元模拟.试验结果表明:普通钢筋混凝土梁发生了以剪切破坏为主的弯剪破坏,呈现出脆性破坏的特点,而钢筋钢纤维混凝土梁发生弯曲破坏达到极限状态,属于延性破坏;钢筋钢纤维混凝土梁的临界温度为594℃,相比于普通钢筋混凝土梁(545℃)提高了9.0%;临界状态下,钢筋钢纤维混凝土梁的跨中挠度更大、弯曲裂缝发展更加充分、裂缝宽度更大,但裂缝间距更小、主裂缝之间的衍生裂缝更多.数值研究表明:加入适量的钢纤维能增强混凝土的整体性,使其受力更加均匀,随着钢纤...
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| Published in | Jianzhu Gangjiegou Jinzhan Vol. 27; no. 2; pp. 9 - 20 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
武汉理工大学 土木工程与建筑学院,武汉 430070
2025
Editorial Department of Progress in Steel Building Structures, Tongji University |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1671-9379 |
| DOI | 10.13969/j.jzgjgjz.20230913003 |
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| Abstract | TU352.5%TU398; 为了研究钢筋钢纤维混凝土梁在高温下的抗火性能,对截面尺寸和配筋均相同的钢筋钢纤维混凝土梁和普通钢筋混凝土梁开展了抗火试验和有限元模拟.试验结果表明:普通钢筋混凝土梁发生了以剪切破坏为主的弯剪破坏,呈现出脆性破坏的特点,而钢筋钢纤维混凝土梁发生弯曲破坏达到极限状态,属于延性破坏;钢筋钢纤维混凝土梁的临界温度为594℃,相比于普通钢筋混凝土梁(545℃)提高了9.0%;临界状态下,钢筋钢纤维混凝土梁的跨中挠度更大、弯曲裂缝发展更加充分、裂缝宽度更大,但裂缝间距更小、主裂缝之间的衍生裂缝更多.数值研究表明:加入适量的钢纤维能增强混凝土的整体性,使其受力更加均匀,随着钢纤维体积掺量的增加,钢筋钢纤维混凝土梁的抗弯刚度也随之增强;不同钢纤维体积掺量的钢筋钢纤维混凝土梁的力学性能分析表明,当钢纤维体积掺量为1.0%时,梁的挠度发展更加充分;增加配筋率可以增强钢筋钢纤维混凝土梁的初始刚度,但当配筋率超过一定值后,其对抗弯刚度的提高效果不明显,反而会降低钢筋的利用效率. |
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| AbstractList | TU352.5%TU398; 为了研究钢筋钢纤维混凝土梁在高温下的抗火性能,对截面尺寸和配筋均相同的钢筋钢纤维混凝土梁和普通钢筋混凝土梁开展了抗火试验和有限元模拟.试验结果表明:普通钢筋混凝土梁发生了以剪切破坏为主的弯剪破坏,呈现出脆性破坏的特点,而钢筋钢纤维混凝土梁发生弯曲破坏达到极限状态,属于延性破坏;钢筋钢纤维混凝土梁的临界温度为594℃,相比于普通钢筋混凝土梁(545℃)提高了9.0%;临界状态下,钢筋钢纤维混凝土梁的跨中挠度更大、弯曲裂缝发展更加充分、裂缝宽度更大,但裂缝间距更小、主裂缝之间的衍生裂缝更多.数值研究表明:加入适量的钢纤维能增强混凝土的整体性,使其受力更加均匀,随着钢纤维体积掺量的增加,钢筋钢纤维混凝土梁的抗弯刚度也随之增强;不同钢纤维体积掺量的钢筋钢纤维混凝土梁的力学性能分析表明,当钢纤维体积掺量为1.0%时,梁的挠度发展更加充分;增加配筋率可以增强钢筋钢纤维混凝土梁的初始刚度,但当配筋率超过一定值后,其对抗弯刚度的提高效果不明显,反而会降低钢筋的利用效率. 为了研究钢筋钢纤维混凝土梁在高温下的抗火性能，对截面尺寸和配筋均相同的钢筋钢纤维混凝土梁和普通钢筋混凝土梁开展了抗火试验和有限元模拟。试验结果表明：普通钢筋混凝土梁发生了以剪切破坏为主的弯剪破坏，呈现出脆性破坏的特点，而钢筋钢纤维混凝土梁发生弯曲破坏达到极限状态，属于延性破坏；钢筋钢纤维混凝土梁的临界温度为594 ℃，相比于普通钢筋混凝土梁（545 ℃）提高了9.0%；临界状态下，钢筋钢纤维混凝土梁的跨中挠度更大、弯曲裂缝发展更加充分、裂缝宽度更大，但裂缝间距更小、主裂缝之间的衍生裂缝更多。数值研究表明：加入适量的钢纤维能增强混凝土的整体性，使其受力更加均匀，随着钢纤维体积掺量的增加，钢筋钢纤维混凝土梁的抗弯刚度也随之增强；不同钢纤维体积掺量的钢筋钢纤维混凝土梁的力学性能分析表明，当钢纤维体积掺量为1.0%时，梁的挠度发展更加充分；增加配筋率可以增强钢筋钢纤维混凝土梁的初始刚度，但当配筋率超过一定值后，其对抗弯刚度的提高效果不明显，反而会降低钢筋的利用效率。 |
| Abstract_FL | To study the fire resistance of reinforced steel fiber concrete beams at high temperatures,fire tests and finite element simulations were conducted on reinforced steel fiber concrete beams and ordinary reinforced concrete beams with identical cross-sectional dimensions and reinforcement.The test results showed that ordinary reinforced concrete beams exhibited shear-dominated flexural-shear failure with brittle characteristics,while reinforced steel fiber concrete beams exhibited flexural failure with ductile characteristics.The critical temperature of reinforced steel fiber concrete beams was 594℃,representing a 9%increase compared to ordinary reinforced concrete beams(545℃).At the critical state,the reinforced steel fiber concrete beams exhibited larger mid-span deflection,more extensive development of bending cracks,and wider crack width,but smaller crack spacing and more derived cracks between primary cracks.Additionally,numerical investigations indicated that adding steel fibers can enhance the overall integrity of concrete,making it more uniformly loaded.The flexural stiffness of the reinforced steel fiber concrete beams increases as the steel fiber content increases.The analysis of mechanical properties of reinforced steel fiber concrete beams with different volumes of fibers shows that when the volume content of steel fiber is 1.0%,the deflection of reinforced steel fiber concrete beams is more fully developed.Increasing the reinforcement ratio can enhance the initial stiffness of reinforced steel fiber concrete beams.However,beyond a certain value,further increasing the reinforcement ratio does not significantly contribute to improving their flexural stiffness and instead,results in reduced efficiency of steel reinforcement utilization. |
| Author | 周焕廷 陈建平 邹有云 |
| AuthorAffiliation | 武汉理工大学 土木工程与建筑学院,武汉 430070 |
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| Author_FL | CHEN Jianping ZHOU Huanting ZOU Youyun |
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| Keywords | 高温 steel fiber concrete beam 抗火试验 steel fiber fire test 钢纤维混凝土梁 抗弯性能 flexural behavior high temperature 钢纤维 |
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| SubjectTerms | 抗弯性能 抗火试验 钢纤维 钢纤维混凝土梁 高温 |
| Title | 钢筋钢纤维混凝土梁与钢筋混凝土梁抗火性能试验及对比分析 |
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