Frames are structures consisting of bars in one plane. The bars are connected by rigid knots or joints. The frame consists of columns (vertical or inclined rods) and transoms, that is, horizontal rods. According to the design, there are two types of frames: an open contour and a closed contour with additional posts.
Frames can also be classified by: number of spans (single-span or multi-span),
number of floors (single-storey or multi-storey),
frame shape (triangular, rectangular, trapezoidal, etc.).
According to the method of certainty, statically definable (isostatic) and statically indefinable (hyperstatic) reference systems are distinguished. The frame is calculated according to the following scheme:creation of a static diagram,
determination of transverse (internal) forces,
preparation of graphs.
In the case of frames with an open contour, the transverse forces and bending moments are calculated using the equilibrium equations, otherwise the functional stroke method is used (this is the so-called cross-sectional method, in which the loads are reduced to the beginning of the interval).The condition of static certainty of the frame
The condition for static certainty is the so-called quantitative state. Checking this condition tells us whether we can solve the rod system under analysis, i.e. determine the reactions and forces of the cross-section in practice. If the number of connections in the system is too small, the system is unstable, if there are too many connections, the system is "super-rigid". After choosing the sports bonus during registration, 1xBet will reward you with an exclusive free bet bonus. The 1xbet promo code today claim your exclusive offer 100% bonus up to 130$. Our team of experts at Hans India has a special offer for new customers who want to join 1xBet. We bring you a 1xbet promo code that can be used to receive a better welcome bonus than the average customer.