Transversal loads and bending moment on a cross section, created with TikZ using the structuralanalysis package.

Edit and compile if you like:
% Transversal loads% Author: Marco Castelli\documentclass[border=10pt]{standalone}\usepackage{siunitx}\usepackage{structuralanalysis}\renewcommand*{\familydefault}{\sfdefault}\begin{document}\begin{tikzpicture}[every node/.append style = {font=\sffamily}]\point{a}{0}{2.4};\point{b}{2}{2.4};\point{c}{10}{2.4};\point{d}{12}{2.4};\point{e}{4}{0};\point{f}{8}{0};\beam{4}{a}{d}[0][0];\beam{4}{b}{e}[1][1];\beam{4}{e}{f}[1][1];\beam{4}{f}{c}[1][1];\point{asf1}{0.75}{2.6};\point{asf2}{11.25}{2.6};\point{asfT}{6}{2.4};\lineload{1}{asf1}{asf2}[0.4][0.4];\notation{1}{asfT}{Manto stradale}[above];\point{cord1}{0}{2.6};\point{cord2}{0.75}{2.6};\point{cordT1}{0.375}{2.4};\lineload{1}{cord1}{cord2}[0.4][0.4];\notation{1}{cordT1}{Securvia}[above];\point{cord3}{11.25}{2.6};\point{cord4}{12}{2.6};\point{cordT2}{11.655}{2.4};\lineload{1}{cord3}{cord4}[0.4][0.4];\notation{1}{cordT2}{Securvia}[above];\point{L21}{1.5}{3.3};\point{L22}{4.5}{3.3};\point{L2T1}{1.5}{3.9};\lineload{1}{L21}{L22}[0.6][0.6];\notation{1}{L2T1}{$\SI{2.5}{\kN\per\square\m}$}[left];\point{L23}{7.5}{3.3};\point{L24}{10.5}{3.3};\point{L2T2}{10.5}{3.9};
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