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一、试验梁的设计与制造[1] 试验梁分两组:LA组用6根40MnSi_2VⅡ25Ⅳ级钢筋作预应力筋,LB组用4束3—7φ5钢绞线作预应力筋。非预应力筋均为φ14Ⅱ级钢筋,箍筋为φ6.5Ⅰ级钢筋。试验梁全长4.50m。计算跨度4.00m,顶面宽1.30m,底缘宽0.78m,梁高0.26m。截面尺寸及钢筋布置如图1所示。混凝土标号为500级。试验梁在西南交大土木系工程结构试验室构件车间制造。梁体浇筑后自然养生。待混凝土达到一定强度后,用YC—60千斤顶张拉预应力钢筋。张拉时除利用油压表控制张拉力外,还量测了非预应力筋的应变,LA组梁并量测了预应力粗钢筋的应变,LB组梁则兼用压力传感器控制张拉力。
First, the design and manufacture of test beam [1] The test beam is divided into two groups: LA group with six 40MnSi_2VⅡ25Ⅳ grade steel bars as prestressing tendons, LB group with 4-3-7φ5 strand as prestressed tendons. Non-prestressed tendons are φ14 Ⅱ grade steel, stirrup φ6.5 Ⅰ grade steel. Test beam length of 4.50m. The calculated span is 4.00m, the top is 1.30m wide, the bottom margin is 0.78m, and the beam height is 0.26m. Section size and reinforcement layout shown in Figure 1. Concrete grade 500. Test beam in the Southwest Jiaotong University Civil Engineering structural laboratory components workshop manufacturing. Beam body after pouring natural health. After concrete reaches a certain strength, with YC-60 jack tension prestressed steel. In addition to the use of hydraulic gauge tension control tensile force, but also measured the strain of non-prestressed tendons, LA group beam and measured the prestressed coarse steel strain, LB group beam and the pressure sensor to control the tension.