def eq141d13(fy):
    """Shear in webs of rolled beams and plate girders, gross section
    
    AREMA 2018 Table 15-1-11 Row 13 Equations 
    
    
    fa = 0.35*fy
    
    
    Args:
        fy (float): yield stress
        
    Returns:
        fa (tuple(float, str)): Allowable shear stress in webs
    
    """
    ref_text = "AREMA 2018 Section 1.4.1 Table 15-1-11 Row 13 \n\n"
    
    user_input = f'fy = {fy:.1f} psi \n\n' 
    
    fa_v = 0.35*fy
    
    text = (f'fa_v = 0.35*fy \n' +
            f'fa_v = 0.35*{fy:.2f} \n' +
            f'fa_v = {fa_v:.2f} \n')
    
    text = ref_text + user_input + text
    
    return fa_v, text