Structural acquisition method for shock-absorbing layer of combined structure of underground structure and viaduct

Abstract

The present invention discloses a method for obtaining a structure considering a shock-absorbing layer of a combined structure of an underground structure and a viaduct, belonging to the technical field of building structure shock absorption, including: obtaining parameters of a combined structure of an underground structure and a viaduct provided with a shock-absorbing layer; obtaining structural reinforcement calculation parameters; obtaining the elastic modulus of virtual reinforced concrete; obtaining the thickness of an actual reinforced concrete structure according to the stiffness of the virtual reinforced concrete structure; and obtaining the reinforcement area of the actual reinforced concrete structure according to the thickness of the actual reinforced concrete structure. The method for obtaining a structure considering a shock-absorbing layer of a combined structure of an underground structure and a viaduct in this application, based on the principle of equivalent material area and the principle of equivalent structural flexural stiffness, calculates the size and reinforcement of the actual reinforced concrete structure layer through the force analysis of the virtual reinforced concrete structure. It fully considers the effective utilization of the shock-absorbing layer, optimizes the structural design, greatly reduces the consumption of steel bars and concrete, and saves project investment.

Description

Technical Field

[0001] The present invention belongs to the technical field of seismic reduction of building structures, and particularly relates to a method for obtaining the structure of a seismic reduction layer for a combined structure of an underground structure and a viaduct. Background Art

[0002] In the renovation areas of some old urban areas, in order to alleviate the increasingly tense urban traffic situation and save urban construction space, combined structures of underground structures and viaducts are also adopted by more and more cities.

[0003] The existing connection method between the underground structure and the viaduct uses rigid joints, resulting in a large vertical span and weak horizontal seismic resistance. During an earthquake, the upper bridge is prone to collapse as a whole and cause damage to the underground structure.

[0004] In view of the problem of weak horizontal seismic resistance caused by the rigid connection between the existing underground structure and the viaduct, using a foam concrete seismic reduction layer structure to improve the seismic performance of the combined structure is a relatively economical and practical method. However, when designing the foam concrete seismic reduction layer structure, it is generally necessary to establish a complex analysis model to consider the influence of the seismic reduction layer, which is time-consuming and laborious. Summary of the Invention

[0005] In view of one or more of the above defects or improvement requirements of the prior art, the present invention provides a method for obtaining the structure of a seismic reduction layer for a combined structure of an underground structure and a viaduct, so as to solve the problem that the design of the existing foam concrete seismic reduction layer structure is cumbersome and time-consuming.

[0006] To achieve the above object, the present invention provides a method for obtaining the structure of a seismic reduction layer for a combined structure of an underground structure and a viaduct. The seismic reduction layer structure includes a reinforced concrete layer and a seismic reduction layer, and the method includes the following steps:

[0007] S1. Obtain the structural reinforcement calculation parameters according to the parameters of the combined structure of the underground structure and the viaduct provided with the seismic reduction layer;

[0008] S2. Simulate the reinforced concrete layer without the seismic reduction layer as a virtual reinforced concrete structure, and obtain the elastic modulus of the virtual reinforced concrete structure;

[0009] S3. Obtain the stiffness of the virtual reinforced concrete structure, and obtain the thickness of the actual reinforced concrete structure according to the stiffness of the virtual reinforced concrete structure;

[0010] S4. Obtain the reinforcement area of the actual reinforced concrete structure according to the thickness of the actual reinforced concrete structure.

[0011] As a further improvement of the present invention, the parameters of the underground structure with a shock-absorbing layer and the viaduct combined structure in step S1 include: the elastic modulus of the shock-absorbing layer, the elastic modulus of the steel bars, the calculated width of the structure, and the thickness of the shock-absorbing layer structure.

[0012] As a further improvement of the present invention, the structural reinforcement calculation parameters obtained in step S1 include: the thickness of the virtual reinforced concrete and the reinforcement ratio of the cross-section of the virtual reinforced concrete structure.

[0013] As a further improvement of the present invention, the elastic modulus of the virtual reinforced concrete structure in step S2 is obtained from the elastic modulus of the concrete, the reinforcement ratio of the cross-section of the virtual reinforced concrete structure, and the elastic modulus of the steel bars.

[0014] As a further improvement of the present invention, the calculation method of the elastic modulus of the virtual reinforced concrete structure is:

[0015] (Formula 1)

[0016] Wherein, E 1 is the elastic modulus of the virtual reinforced concrete; E 0 is the selected elastic modulus of the concrete; E g is the elastic modulus of the steel bars; is the reinforcement ratio of the cross-section of the virtual reinforced concrete structure.

[0017] As a further improvement of the present invention, the cross-sectional reinforcement area of the virtual reinforced concrete structure is obtained by the following formula transformation:

[0018] (Formula 2)

[0019] Wherein, is the cross-sectional reinforcement area of the virtual reinforced concrete structure, is the cross-sectional area of the virtual reinforced concrete structure, a is the calculated width of the structure, h 1 is the thickness of the virtual reinforced concrete structure.

[0020] As a further improvement of the present invention, the actual thickness of the reinforced concrete structure in step S3 is obtained according to the principle of equivalent flexural stiffness of the structure, that is:

[0021] (Formula 3)

[0022] Wherein, E 1 is the elastic modulus of the virtual reinforced concrete; E 2 is the elastic modulus of the shock-absorbing layer material; I 1 is the moment of inertia of the virtual reinforced concrete structure; I 2 is the moment of inertia of the shock-absorbing layer structure; Iis the moment of inertia of the actual reinforced concrete structure.

[0023] As a further improvement of the present invention, the calculation methods of the moment of inertia of the virtual reinforced concrete structure, the moment of inertia of the shock-absorbing layer structure, and the moment of inertia of the actual reinforced concrete structure in step S3 are as follows:

[0024] (Formula 4)

[0025] (Formula 5)

[0026] (Formula 6)

[0027] Among them, a is the structural calculation width; h is the thickness of the actual reinforced concrete structure; h 1 is the thickness of the virtual reinforced concrete structure; h 2 is the thickness of the shock-absorbing layer structure.

[0028] As a further improvement of the present invention, the reinforcement area of the actual reinforced concrete structure in step S4 is obtained according to the cross-sectional reinforcement ratio of the virtual reinforced concrete structure, the structural calculation width, and the thickness of the actual reinforced concrete structure.

[0029] As a further improvement of the present invention, the calculation method of the reinforcement area of the actual reinforced concrete structure in step S4 is as follows:

[0030] (Formula 7)

[0031] Among them, ρ is the cross-sectional reinforcement ratio of the actual reinforced concrete structure; is the cross-sectional reinforcement ratio of the virtual reinforced concrete structure; S g is the cross-sectional reinforcement area of the actual reinforced concrete structure; a is the structural calculation width; h is the thickness of the actual reinforced concrete structure.

[0032] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0033] Generally speaking, compared with the prior art, the beneficial effects of the above technical solutions conceived by the present invention include:

[0034] (1) The structural acquisition method for the shock-absorbing layer of the combined structure of the underground structure and the viaduct in the present invention simulates the reinforced concrete layer without the shock-absorbing layer as a virtual reinforced concrete structure. Based on the principle of equivalent material area and the principle of equivalent flexural stiffness of the structure, the dimensions and reinforcement of the actual reinforced concrete structure layer are deduced through the force analysis of the virtual reinforced concrete structure. Its overall calculation idea is relatively clear, the calculation method is simple, and it has strong applicability in engineering calculations. It fully considers the effective utilization of the shock-absorbing layer, optimizes the structural design, greatly reduces the consumption of steel bars and concrete, and saves engineering investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic flow chart of the structural acquisition method for the shock-absorbing layer of the combined structure of the underground structure and the viaduct in an embodiment of the present invention;

[0036] Figure 2 is a schematic cross-sectional view of the virtual reinforced concrete structure of the shock-absorbing layer structure of the combined structure of the underground structure and the viaduct in an embodiment of the present invention;

[0037] Figure 3 is a schematic cross-sectional view of the actual reinforced concrete layer and the shock-absorbing layer of the shock-absorbing layer structure of the combined structure of the underground structure and the viaduct in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0043] Embodiment:

[0044] Please refer to Figures 1 - 3 , the method for obtaining the structure of the shock-absorbing layer of the combined structure of the underground structure and the viaduct in the preferred embodiment of the present invention includes the following steps:

[0045] S1. Obtain the structural reinforcement calculation parameters according to the parameters of the combined structure of the underground structure and the viaduct provided with the shock-absorbing layer;

[0046] S2. Simulate the reinforced concrete layer without the shock-absorbing layer as a virtual reinforced concrete structure and obtain the elastic modulus of the virtual reinforced concrete structure;

[0047] S3. Obtain the stiffness of the virtual reinforced concrete structure and obtain the thickness of the actual reinforced concrete structure according to the stiffness of the virtual reinforced concrete structure;

[0048] S4. Obtain the reinforcement area of the actual reinforced concrete structure according to the thickness of the actual reinforced concrete structure.

[0049] This application mainly calculates the combined structure with a shock-absorbing layer, and this shock-absorbing layer structure mainly refers to a building structure with a composite structure of a reinforced concrete layer and a shock-absorbing layer. It should be noted that in the conventional design process, when the structural reinforcement of the reinforced concrete structure is reasonable and meets the specification requirements, the design work of ordinary structural members can be completed, that is, the conventional structural members can be terminated at step S1.

[0050] It should be noted that the virtual reinforced concrete structure in the above steps is the virtual reinforced concrete structure without considering the shock-absorbing layer structure; the actual reinforced concrete structure in the above steps is the reinforced concrete structure including the shock-absorbing layer structure.

[0051] This application obtains the structural parameters of the combined structure of the underground structure and the viaduct with a shock-absorbing layer through the engineering design data of the combined structure of the underground structure and the viaduct with a shock-absorbing layer. Then, based on the above engineering design data, the internal forces of the combined structure of the underground structure and the viaduct are analyzed to obtain its structural reinforcement calculation. Finally, the structure without considering the shock-absorbing layer is simulated as a virtual reinforced concrete structure. Based on the principle of equivalent material area and the principle of equivalent structural flexural stiffness, the size and reinforcement of the actual reinforced concrete structure considering the shock-absorbing layer are deduced according to the force analysis of the virtual reinforced concrete structure, so as to obtain the specific design parameters of the actual combined structure with a shock-absorbing layer.

[0052] Specifically, the structural parameters obtained in step S1 of this application mainly include the elastic modulus of the shock-absorbing layer, the elastic modulus of the steel bars, the structural calculation width, and the thickness of the shock-absorbing layer structure, etc.

[0053] Furthermore, the structural reinforcement calculation parameters obtained in step S1 of this application mainly include the thickness of the virtual reinforced concrete and the sectional reinforcement ratio of the virtual reinforced concrete structure, etc. The structural reinforcement calculation parameters in the above step S1 are mainly obtained from the structural reinforcement situation in the "Code for Design of Concrete Structures" (GB50010-2010, 2015 Edition). The acquisition of this parameter is mainly obtained through the existing technology and will not be elaborated here.

[0054] Furthermore, the elastic modulus of the virtual reinforced concrete in step S2 of this application is mainly obtained from the elastic modulus of the concrete, the sectional reinforcement ratio of the virtual reinforced concrete structure, and the elastic modulus of the steel bars. Since in the actual construction process, this shock-absorbing layer structure includes a shock-absorbing layer and a reinforced concrete layer, and the pure reinforced concrete layer may not meet the mechanical requirements of normal construction, it is necessary to simulate the reinforced concrete layer without considering the shock-absorbing layer structure as a pure virtual reinforced concrete structure to make it meet the construction requirements, and then reverse-deduce the size of the actual reinforced concrete structure through the virtual reinforced concrete structure.

[0055] In this calculation process, the reinforced concrete structure that completely ignores the effect of the damping layer is simulated as a virtual reinforced concrete structure, and the elastic modulus of the virtual reinforced concrete is obtained according to the principle of equivalent area. The specific calculation method is as follows:

[0056] (Formula 1)

[0057] Wherein, E 1 is the elastic modulus of the virtual reinforced concrete; E 0 is the selected elastic modulus of concrete; E g is the elastic modulus of steel bars; is the cross-sectional reinforcement ratio of the virtual reinforced concrete structure.

[0058] Furthermore, as a preferred embodiment in the present invention, the cross-sectional reinforcement area of the virtual reinforced concrete structure is obtained through the following formula transformation:

[0059] (Formula 2)

[0060] Wherein, is the cross-sectional reinforcement area of the virtual reinforced concrete structure, is the cross-sectional area of the virtual reinforced concrete structure, a is the structural calculation width, h 1 is the thickness of the virtual reinforced concrete structure.

[0061] After obtaining the elastic modulus of the virtual reinforced concrete in the above step S2, the actual thickness of the actual reinforced concrete structure can be obtained based on it. Similarly, the actual thickness of the actual reinforced concrete structure here is also obtained through transformation according to the principle of equivalent flexural stiffness of the structure. According to the equivalent principle, the stiffness of the virtual reinforced concrete structure is equal to the combined stiffness of the damping layer and the actual reinforced concrete structure at this time, and the specific manifestation is as follows:

[0062] (Formula 3)

[0063] Wherein, E 1 is the elastic modulus of the virtual reinforced concrete; E 2 is the elastic modulus of the damping layer material; I 1 is the moment of inertia of the virtual reinforced concrete structure; I 2 is the moment of inertia of the damping layer structure; I is the moment of inertia of the actual reinforced concrete structure.

[0064] Furthermore, the moment of inertia of the virtual reinforced concrete structure I 1, the moment of inertia of the damping layer structure I 2 and the moment of inertia of the actual reinforced concrete structureI They can all be obtained through the following arithmetic transformations, as follows:

[0065] (Formula 4)

[0066] (Formula 5)

[0067] (Formula 6)

[0068] Among them, a is the structural calculation width; h is the actual reinforced concrete structure thickness; h 1 is the virtual reinforced concrete structure thickness; h 2 is the damping layer structure thickness.

[0069] Since in Formulas 4, 5, and 6 a, h 1、 h 2 are all known, and then substituting I, I 1、 I 2 into Formula 3, in Formula 3 E 1 is obtained through Step S3, E 2 is known, and there is only h as the unknown in the whole formula, and the actual reinforced concrete structure thickness h can be obtained through the above transformation.

[0070] In the above formula, the structural calculation width a usually takes a unit width of 1m, and the concrete elastic modulus is usually determined according to the concrete material selection.

[0071] After obtaining the actual reinforced concrete structure thickness in Step S3, the reinforcement area of the actual reinforced concrete structure can be obtained according to this actual reinforced concrete structure thickness, and the specific calculation method is as follows:

[0072] (Formula 7)

[0073] Among them, ρ is the cross-section reinforcement ratio of the actual reinforced concrete structure; is the cross-section reinforcement ratio of the virtual reinforced concrete structure; S g is the cross-section reinforcement area of the actual reinforced concrete structure; a is the structural calculation width; h is the actual reinforced concrete structure thickness, and the cross-section reinforcement area of the actual reinforced concrete structure S g can be obtained by solving through the above transformation.

[0074] Specifically, the calculation of the reinforced concrete structure at the side wall of the shock-absorbing layer of the combined structure of the underground structure and the viaduct is taken as an example. It is assumed that the structural parameters and the calculation parameters of the structural reinforcement in the normal process have been obtained, and the virtual reinforced concrete thickness h is 0.8 m, and the cross-sectional reinforcement ratio of the virtual reinforced concrete structure is 1.4%; the side wall uses C35 concrete, and the elastic modulus of the concrete E 0 is 31.5 GPa, the shock-absorbing layer is made of foam concrete, and the elastic modulus E 2 is 4 GPa, and the elastic modulus of the steel bars E g is 210 GPa. The structural calculation width a is taken as 1 m for the unit width, and the thickness of the shock-absorbing layer structure h 2 is 0.4 m.

[0075] The above parameters are all material property parameters and conventional calculation results, which will not be elaborated here. Based on the known conditions, the following structural calculations are made:

[0076] (1) Determine the elastic modulus of the reinforced concrete E 1 and the cross-sectional area of the virtual reinforced concrete structure .

[0077]

[0078]

[0079] The elastic modulus of the reinforced concrete E 1 is obtained as 34.44 GPa, and the cross-sectional area of the virtual reinforced concrete structure is 11200 mm 2 .

[0080] (2) List the solution formulas for the moment of inertia of the virtual reinforced concrete structure I 1, the moment of inertia of the shock-absorbing layer structure I 2, and the moment of inertia of the actual reinforced concrete structure I ; Substitute the above solution formulas into the stiffness equivalent equation to find the thickness of the actual reinforced concrete structure h .

[0081]

[0082]

[0083]

[0084] Then substitute the above solution formulas into , that is:

[0085]

[0086] The calculated actual thickness h of the reinforced concrete structure is 0.57 m. Considering redundancy design, the actual thickness h is rounded up to 0.6 m with one decimal place reserved here.

[0087] (3)Based on the obtained actual thickness of the reinforced concrete structure h , and with the reinforcement ratio remaining unchanged, the reinforcement area of the actual reinforced concrete structure is deduced S g :

[0088]

[0089] The obtained reinforcement area of the actual reinforced concrete structure is 8.4×10 -3 m 2 , that is, 8400 mm 2 .

[0090] Through calculation, it can be known that the thickness of the actual reinforced concrete structure obtained by this calculation method is 0.6 m, saving 0.2 m in thickness compared with the 0.8 m thickness of the reinforced concrete in the conventional design; its reinforcement ratio of the actual reinforced concrete structure remains unchanged, and the reinforcement area is 8400 mm 2 , saving 25% of the steel usage compared with the 11200 mm 2 reinforcement area of the reinforced concrete in the conventional design.

[0091] The method for obtaining the structure considering the shock-absorbing layer of the combined structure of the underground structure and the viaduct in the present invention simulates the reinforced concrete layer without the shock-absorbing layer as a virtual reinforced concrete structure. Based on the principle of equivalent material area and the principle of equivalent structural flexural stiffness, the dimensions and reinforcement ratio of the actual reinforced concrete structure layer are deduced through the force analysis of the virtual reinforced concrete structure. Its overall calculation idea is relatively clear, the calculation method is simple, and it has strong applicability in engineering calculations. It fully considers the effective utilization of the shock-absorbing layer, optimizes the structural design, greatly reduces the usage of steel and concrete structures, and saves project investment.

[0092] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for obtaining a structure of a shock-absorbing layer for a combined structure of an underground structure and a viaduct, the structure of the shock-absorbing layer of the combined structure of the underground structure and the viaduct comprising a reinforced concrete layer and a shock-absorbing layer, characterized in that, It includes the following steps: S1. Obtain the structural reinforcement calculation parameters according to the parameters of the combined structure of the underground structure with a shock-absorbing layer and the viaduct; S2. Simulate the reinforced concrete layer without the shock-absorbing layer as a virtual reinforced concrete structure and obtain the elastic modulus of the virtual reinforced concrete structure; S3. Obtain the stiffness of the virtual reinforced concrete structure and obtain the thickness of the actual reinforced concrete structure according to the stiffness of the virtual reinforced concrete structure; the thickness of the actual reinforced concrete structure is obtained by transformation based on the principle of equivalent flexural stiffness of the structure, that is: (Formula 3) Among them, E 1 is the elastic modulus of the virtual reinforced concrete; E 2 is the elastic modulus of the damping layer material; I 1 is the moment of inertia of the virtual reinforced concrete structure; I 2 is the moment of inertia of the damping layer structure; I is the moment of inertia of the actual reinforced concrete structure; The calculation methods of the moment of inertia of the virtual reinforced concrete structure, the moment of inertia of the shock-absorbing layer structure and the moment of inertia of the actual reinforced concrete structure are: (Formula 4) (Formula 5) (Formula 6) Among them, a is the structural calculation width; h is the actual thickness of the reinforced concrete structure; h 1 is the virtual thickness of the reinforced concrete structure; h 2 is the thickness of the shock-absorbing layer structure; S4. Obtain the reinforcement area of the actual reinforced concrete structure according to the thickness of the actual reinforced concrete structure.

2. The method for obtaining a structure considering a shock-absorbing layer of a combined structure of an underground structure and a viaduct according to claim 1, characterized in that The parameters of the combined structure of the underground structure with a shock-absorbing layer and the viaduct in step S1 include: the elastic modulus of the shock-absorbing layer, the elastic modulus of the steel bars, the structural calculation width and the thickness of the shock-absorbing layer structure.

3. The method for obtaining the structure of the shock absorption layer considering the combined structure of the underground structure and the viaduct according to claim 1, wherein The structural reinforcement calculation parameters obtained in step S1 include: the thickness of the virtual reinforced concrete and the sectional reinforcement ratio of the virtual reinforced concrete structure.

4. The method for obtaining the structure of the shock absorption layer of the combined structure of the underground structure and the viaduct according to claim 1, characterized in that, The elastic modulus of the virtual reinforced concrete structure in step S2 is obtained through the elastic modulus of the concrete, the sectional reinforcement ratio of the virtual reinforced concrete structure and the elastic modulus of the steel bars.

5. The method for obtaining a structure of a shock absorption layer considering an underground structure and a combined structure of a viaduct according to claim 4, wherein The calculation method of the elastic modulus of the virtual reinforced concrete structure is: (Formula 1) Among them, E 1 is the elastic modulus of the virtual reinforced concrete; E 0 is the selected elastic modulus of the concrete; E g is the elastic modulus of the steel bar; is the reinforcement ratio of the cross-section of the virtual reinforced concrete structure.

6. The method for obtaining the structure of the shock absorption layer of the combined structure of the underground structure and the viaduct according to claim 4, characterized in that The sectional reinforcement area of the virtual reinforced concrete structure is obtained by transformation through the following formula: (Formula 2) Among them, is the reinforcement ratio of the cross-section of the virtual reinforced concrete structure, is the reinforcement area of the cross-section of the virtual reinforced concrete structure, is the cross-sectional area of the virtual reinforced concrete structure, a is the structural calculation width, h 1 is the thickness of the virtual reinforced concrete structure.

7. The method for obtaining the structure of the shock-absorbing layer considering the combined structure of the underground structure and the viaduct according to claim 1, characterized in that, The reinforcement area of the actual reinforced concrete structure in step S4 is obtained according to the sectional reinforcement ratio of the virtual reinforced concrete structure, the structural calculation width and the thickness of the actual reinforced concrete structure.

8. The method for obtaining the structure of the shock absorption layer of the combined structure of the underground structure and the viaduct according to claim 7, characterized in that The calculation method of the reinforcement area of the actual reinforced concrete structure in step S4 is: (Formula 7) Among them, ρ is the reinforcement ratio of the cross-section of the actual reinforced concrete structure; is the reinforcement ratio of the cross-section of the virtual reinforced concrete structure; S g is the reinforcement area of the cross-section of the actual reinforced concrete structure; a is the structural calculation width; h is the thickness of the actual reinforced concrete structure.

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