论文部分内容阅读
37.墙梁正截面受弯承载力计算墙梁考虑增和梁组合工作时,墙和托梁尤如拱的压杆和拉杆.因此洞口的位置十分重要,洞口若打断拱的传力机构则会大大影响其承载力,当洞口不打断拱的传力机构则不影响承载力.所以靠支座的洞口影响承载力较大,一般不允许洞口边在支座上.以前述计算简图为准,现分述无洞口和有洞口正截面受弯承载力如下.在使用荷载Q_2作用下,托梁和墙共同工作.按前述方法确定墙的计算高度后,对无洞口墙梁取截面I—I研究其截面的平衡如图4所示.外荷载Q_2对截面1—I的最大弯矩设为M_2(当Q_2为均布荷载时,最大弯矩在跨中M_2=(Q_2l~2)/2).试验研究表明托梁的上层和下层钢筋将达到流限,其合力设为N_(bt),受压区则在墙体内其合力也为N_(bt).一般说来托梁的合.
37. Calculation of Wall Beam Flexural Bearing Capacity When considering wall reinforcement and beam combination work, walls and joists are like arch rods and tie rods. Therefore, the position of the opening is very important. If the opening breaks the arch, the force transmission mechanism will Greatly affect its bearing capacity, when the hole does not break the arch of the transmission mechanism does not affect the bearing capacity. So rely on the bearing hole affect the bearing capacity is relatively large, generally do not allow the hole in the bearing on the edge. The calculation of the above diagram is Quasi-currently, the bearing capacity of the normal section with no openings and holes is described below. Under the action of the load Q_2, the joists and the wall work together. After determining the calculated height of the wall according to the method described above, take the cross section of the wall beam without holes I— I Study the balance of the cross section as shown in Fig. 4. The maximum bending moment of the external load Q_2 to the cross section 1-I is set to M 2 (when Q 2 is a uniform load, the maximum bending moment in the midspan M_2 = (Q_2l~2)/ 2). Experimental studies have shown that the upper and lower reinforcing bars of the joist will reach the flow limit, the resultant force is set to N_(bt), and the combined pressure in the compression zone is also N_(bt) in the wall. Generally speaking, the joist Together.