SU622120A1 - Device for simulating pile in soil - Google Patents

Description

one

The proposed device relates to analog computing.

A device for modeling the bending of beams 1 is known.

The main disadvantages of this model are the need for electromechanical balancing of the model by iterative multi-cycle potential testing at the nodes requiring a certain time, and methodological error is present, since two grids of low-resistance resistors are interconnected with each other.

The closest to the invention according to the technical solution is a pile simulation device containing a resistor grid for modeling stiffness characteristics of the pile, a current source for modeling an external load, an inverter and an adder 1.

Such a device can not solve the more difficult problem of calculating piles in the ground.

The purpose of the invention is to extend the functionality of the device.

The goal is achieved by the addition of one-way conductor elements and a voltage divider to the device, the resistor grid being made in the form of two chains of the first, second, third resistors and the fourth, fifth and second resistors respectively connected in series. The node point of the resistor grid is connected via the seventh resistor to the output of the adder, the first input of which is connected to the connection point of the first and second resistors of the resistor grid, the second input of the adder is connected to the connection point of the fifth and sixth resistors of the resistor grid. The third and fourth inputs of the adder are connected respectively via an inverter and a nerve element of one-sided conduction - to a nodal point of a resistor grid connected via a second one-sided conduction element to a voltage divider connected to a zero potential cable connected to a nodal point of a resistor grid.

FIG. I shows the pile located

under the influence of a horizontal load;

in fig. 2 shows a device diagram for

modeling piles in the ground.

The device contains a resistor grid

Claims (2)

with nodes O-4 and resistors 5-10, for modeling the displacement coefficients, inverter 11 with feedback resistors 12 (o) and input 13, adder 14 with resistor 15-19, elements 20 and 21 of one-sided conduction, voltage divider 22 simulate bed ratio, resistor 23 and current source 24 for simulating external load. The calculation of the pile in the ground for a horizontal load is made with the following prerequisites: the pile can be detached from the soil located to the left or right of the pile, the soil is characterized by a bed-bed variable with a pile height. Thus, any cross section of a pile located in the ground (Fig. 1) has two options: the pile interacts with the soil on the right and is separated from the soil on the left (“+” sign before the second term in equation (1) or the pile interacts with the soil on the left and detached from the ground to the right (the sign "is before the second term in equation (1). In this formulation, the task is constructively non-linear and due to the fact that the contact zones and the separation zone are not known in advance, cannot be calculated on a computer. For example deformed pile e is characterized by the following equation: .y, p, d EI where y is the displacement of the pile section, K is the linear compliance coefficient, EI is the bending stiffness of the pile, and P is the load on the pile. The device shown in Fig. 2 is used to simulate (1) .If the cross section of the pile is moved to the right, detached from the ground to the left, then element 21 is open and conductivity is included in operation. Element 20 is closed at this time and divider 22 is not included. The device is determined by the following / equalization of electric current for node 0: (9g - 3) (7. - 4g. - 4gt /, + gt /, + + gU, + gJJ, I. (2) If the cross section of the pile moves to the left, Since the ground is right from the ground, considering that the displacement is equivalent to voltage, the work has a different character: element 20 is open and element 21 is closed. The electric current equation for this type of diode operation is: () f /.- 4gt /, - 4g, -f gi /, + gC / 4, L In the simulation of a pile, an inverter, an adder, an additional bedding modeling resistor are included in each node of the circuit. The boundary conditions, the current source simulating the external load is included in the model node located above the ground surface, the model nodes for pile sections located in the soil are not loaded with current sources. Thus, performing the device in accordance with the invention solves the complex structurally nonlinear problem of structural mechanics. No other methods considered the problem in a similar formulation is not solved. Claim device A device for modeling a pile in the ground, containing a resistor grid, a current source, an inverter and an adder, characterized in that in order to extend the functionality by reproducing the pile separation from the ground, one-way conductor elements and a voltage divider are added to the device, with the resistor grid made in the form of two chains of the first, second, third resistors and the fourth, fifth, sixth resistors in series, respectively, the node resist An orifice grid is connected via the seventh resistor to the output of an adder, the first input of which is connected to the connection point of the first and second resistors of the resistor grid, the second input of the adder is connected to the connection point of the fifth and sixth resistors of the resistor grid, and the third and white inputs of the adder are connected respectively the inverter and the first element of one-sided conduction with a node resistor grid connected in four: the second element of one-sided conduction with a voltage divider connected to the zero potential bus ala connected through a current source with a nodal point of the resistor grid. Sources of information taken into account in the examination of 1.25 scientific-technical conference of BPI. Sat “Materials of the section of building mechanics. Minsk, 1969, p. 107. 2. USSR author's certificate number 397939, cl. G 06G 7/68, 1973.  -f - (-