4.1 super power, wind power tower structure

 Still single tube tower program exists:

(1) A single large steel tube tower structure efficiency;
(2) single-tube the Taga large diameter can improve structural efficiency, but caused transport difficulties and local stability issues;
(3) single-tube towers overall stiffness, low natural frequencies accessible to fan vibration frequency, caused by resonance (often not the intensity of control, but the stiffness control);
(4) single-pipe tower wall thickness (over 35mm), single-sided flange connection is difficult to implement, double-sided flange will have to add outside platform.

The reinforced concrete structure program exist:
(1) cast-in-place reinforced concrete tower program can not meet the requirements of the wind power construction period;
(2) problems precast reinforced concrete tower assembly program:
       I) monolithic components overweight, transportation difficulties;
       Ⅱ) on-site installation, grouting strength requirements (C80);
       Ⅲ) cross-the grout seam length, long construction period (relative to the initial setting time);
       Ⅳ) pouring maintenance cycle is long, long residence time of large cranes, large costs;
       Ⅴ) structure weight than steel tower about six times larger (C80), increased earthquake
            The basis of cost increases in soft ground.

4.2 three possible directions of ultra-high-power wind power tower structure
(1) variable cross-section single tube tower, large diameter vertical slice and horizontal segmentation bi-flange connection
Ⅱ) vertical stitching and vertical flange:

  Longitudinal flange force: shear, smaller;
  The longitudinal flange tightness: center tank, both sides close, plus waterproof bars;
  The longitudinal flange lateral flanges interrupted a "bridge" reinforcement;