HRB500級鋼筋活性粉末混凝土梁受彎性能試驗(yàn)研究*
金凌志1,2，何來1,2，吳欣珂3
- 摘 要
-
（1 廣西巖土力學(xué)與工程重點(diǎn)實(shí)驗(yàn)室, 桂林 541004； 2 桂林理工大學(xué)土木與建筑工程學(xué)院， 桂林 541004； 3 南昌鐵路勘測設(shè)計院有限責(zé)任公司， 南昌 330009）
［摘要］通過5根配置HRB500級或HRB400級鋼筋活性粉末混凝土簡支梁的受彎性能試驗(yàn)，分析試驗(yàn)梁在各級荷載作用下的裂縫分布與開展情況。根據(jù)實(shí)測數(shù)據(jù)，驗(yàn)證現(xiàn)行混凝土規(guī)范有關(guān)受拉區(qū)裂縫間距和最大裂縫寬度等計算公式對于試驗(yàn)梁的適用性，并提出了極限彎矩的計算方法。研究表明：試驗(yàn)梁的裂縫分布及寬度與配筋率、鋼筋直徑和鋼筋等級等參數(shù)相關(guān)；計算高強(qiáng)鋼筋活性粉末混凝土梁的正截面承載力時，應(yīng)考慮活性粉末混凝土的抗拉強(qiáng)度和鋼纖維的拉結(jié)作用，受拉區(qū)等效塑性系數(shù)k可取0.3。［關(guān)鍵詞］高強(qiáng)鋼筋; 活性粉末混凝土; 簡支梁; 裂縫寬度; 極限彎矩中圖分類號：TU375 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2015)15-0087-06
Experimental study on flexural property of reactive powder concrete beams with HRB500 steelJin Lingzhi1, 2, He lai1, 2, Wu Xinke3（1 Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering， Guilin 541004, China; 2 College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China; 3 Nanchang Railway Survey & Design Institute, Nanchang 330009, China）Abstract:An experimental study was conducted to investigate the flexural property of 5 reactive power concrete beams with HRB400 or HRB500 steel. The crack distribution and development in test beams were analyzed under various stepwise loadings. According to the measured datum, the applicability of tensile area crack spacing and maximum crack width calculation formulas in current concrete code for test beams were verified, and the computing method of the ultimate bending moment was suggested. The research shows that the crack distribution and width of test beams relate to parameters like reinforcement ratio, steel diameter, steel grade and so on. To calculate the normal section bearing capacity of high strength reinforced reactive powder concrete beams, the tensile strength of reactive powder concrete and the tying effect of steel fiber should be considered, and the equivalent plastic coefficient k within tensile region is set to 0.3.Keywords:high strength steel bar; reactive powder concrete; simple supported beam; crack width; ultimate bending moment
*國家自然科學(xué)基金資助（51368013），廣西重點(diǎn)實(shí)驗(yàn)室項目資助（11-CX-04）。作者簡介：金凌志，學(xué)士，教授，Email：jlz-5904@163.com。
- 下載地址
-
