玻璃纖維片材加固混凝土梁的抗剪試驗研究*
歐陽煜1,2 黃奕輝3 錢在茲4
- 摘 要
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歐陽煜1,2 黃奕輝3 錢在茲4(1 上海大學(xué) 200092; 2 同濟大學(xué) 上海 200092; 3 華僑大學(xué) 福建 362011; 4 浙江大學(xué) 杭州 310027)
[提要] 進行了13根玻璃纖維( GFRP)片材加固混凝土梁和2個對比混凝土梁的抗剪性能試驗研究,分析了GFRP加固梁的抗剪性能。試驗結(jié)果表明,粘貼GFRP片材可以有效地提高梁的抗剪承載力,GFRP片材的受力機理和箍筋相同,加固梁的抗剪承載力取決于GFRP片材的有效應(yīng)變。根據(jù)試驗結(jié)果,提出了GFRP片材有效應(yīng)變的計算公式,并依據(jù)混凝土規(guī)范的計算模型,提出了加固梁的抗剪承載力計算公式。
[關(guān)鍵詞] 混凝土梁 玻璃纖維片材 加固 抗剪承載力 強度發(fā)揮系數(shù)
Thirteen concrete beams strengthened with GFRP sheet and two beams for comparison have been tested. The results show that the contribution of GFRP sheet to shear capacity is same as steel stirrups, and the shear capacity depends on the effective strain of GFRP sheet. The effective strain of GFRP sheet decreases with increasing GFRP sheet axial rigidity. Based on the experimental results, an analytical model for the effective strain of GFRP sheet is developed, and a calculated method for the shear capacity with the framework of modern code formats is presented.
Keywords: RC beam; GFRP sheet; strengthen; shear strength; effective strain