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(三)内力分析 1.托梁内力分析。托梁在荷载g_1、q_1作用下,考虑活荷载q_1作用在不利位置,按一般连续梁进行内力分析,求出各控制截面的最大弯矩和最大剪力。例如,以两跨梁为例,M_(11)和M_(21)表示g_1 、q_1在托梁第1跨和第2跨跨中产生的最大弯矩;M_(B1)表示g_1、q_1在托梁中间支座B产生的最大弯矩(绝对值)。V_(A1)和V_(C1)表示g_1、q_1在托梁支座A的右截面和支座C的左截面产生的最大剪力;V_(B1)~L和V_(B1)~R表示g_1、q_1在托梁支座
(III) Internal force analysis 1. Analysis of internal forces of joist. Under the action of loads g_1 and q_1, the joist takes account of the live load q_1 acting at an unfavorable position. According to the analysis of the internal forces of the general continuous beam, the maximum bending moment and the maximum shear force of each control section are obtained. For example, taking two bridges as an example, M_(11) and M_(21) represent the maximum bending moments generated by g_1, q_1 in the first and second spans of the joist; M_(B1) denotes that g_1, q_1 are in the brackets. The maximum bending moment (absolute value) produced by beam B. V_(A1) and V_(C1) represent the maximum shear forces generated by g_1, q_1 on the right section of joist support A and the left section of support C; V_(B1)~L and V_(B1)~R denote g_1 , q_1 on joist support