KR20050007963A - Wind load and seismic load calculation method - Google Patents

Abstract

PURPOSE: A method for calculating the wind load and a seismic load is provided to automatically calculate the wind load and the seismic load based on the geometric characteristic of the area to construct the buildings. CONSTITUTION: A method for calculating the wind load and a seismic load includes the steps of: a variable input process(S10) for receiving various variable required for calculating the wind load; a process(S12) for calculating the coefficients of altitude distribution by calculating the atmosphere boundary height, a reference height for longitude wind and the altitude distribution index; a process(S14) for calculating the design speed pressure for each height based on the basic wind speed, the degree of significance and the wind speed coefficient; a process(S16) for calculating the design wind force based on the external pressure coefficient; and a process(S18) for calculating the wind load directly applying to the design based on the calculated design wind force and the wind load area.

Description

Wind load and earthquake load calculation method {WIND LOAD AND SEISMIC LOAD CALCULATION METHOD}

The present invention relates to a wind load and earthquake load calculation method, and more particularly, to a wind load and earthquake load calculation method that can automatically calculate the wind load and earthquake load for each height based on the geographical inherent information of the region where the building is located. will be.

In general, before designing a structure, the structure is designed in consideration of the safety, economics, and constructability of the building. When designing the structure, the building is predicted before construction by predicting each external force that the building must endure after the building is built. As described above, the external force predicted before construction is called the design load, and the design load includes fixed load, loading load, snow load, wind load, earthquake load, groundwater pressure and earth pressure, temperature load, and fluid pressure. Etc.

The wind load and the earthquake load of the design load are calculated by considering the regional characteristics of the area where the structure is to be located, based on the building load criteria, and the wind load and the earthquake load by the height of the structure. The load is being calculated.

Accordingly, the time required to calculate the wind load and the earthquake load by a complicated calculation process increases, and there is a problem that a calculation error may occur.

The present invention has been made to solve the above problems, and provides a wind load and earthquake load calculation method for automatically calculating the wind load and earthquake load for each height of the building based on the geographical inherent information of the region where the building is located. Has its purpose.

1 and 2 are a flow chart for explaining a wind load and earthquake load calculation method according to an embodiment of the present technology.

Wind load calculation method according to an embodiment of the present invention for achieving the above object is a variable input process for receiving a variety of variables required for calculation of the wind load; Calculating an altitude distribution coefficient by calculating an air boundary layer height, a reference longitude wind height, and an altitude distribution index according to the altitude for each height; Calculating a design speed pressure for each height based on the calculated altitude distribution coefficient and the basic wind speed, the importance coefficient, and the wind speed premium coefficient received in the variable input process; Calculating a design wind power based on the calculated design speed pressure and an external pressure coefficient received in the variable input process; It is preferable to include the step of calculating the wind load directly applied to the design based on the calculated design wind and wind load area.

Further, the variable may include a basic wind speed of the area where the building is to be installed, an importance factor according to the use and scale of the building, a wind speed premium coefficient according to the terrain in which the building is located, and an external pressure coefficient.

On the other hand, earthquake load calculation method according to an embodiment of the present invention, the variable input process for receiving a variety of variables required for the earthquake load calculation calculation; Calculating a dynamic coefficient based on the ground coefficient and the basic vibration period received in the variable input process; Calculating a bottom shear force and an earthquake coefficient based on the calculated dynamic coefficients, the area coefficients, the importance coefficients, the response modification coefficients, and the total weights received in the variable input process; It is preferable to include the process of calculating the earthquake load in each layer based on the height and weight of each layer.

Furthermore, the variable preferably includes a local coefficient, a importance coefficient, a response correction coefficient, a basic vibration period, a building height, and a ground coefficient.

Hereinafter, a wind load and an earthquake load calculation method according to a preferred embodiment of the present invention with reference to the accompanying drawings will be described in detail.

1 and 2 are flow charts for explaining the wind load and earthquake load calculation method according to an embodiment of the present technology, Figure 1 is a flow chart for explaining the wind load calculation method, Figure 2 is a method for calculating the earthquake load This is a flowchart for explanation.

First, referring to the wind load calculation process, as shown in FIG. 1, various variables required for the wind load calculation are input (S10).

Variables received in the above process S10, the basic wind speed (V ₀ ) of the area where the structure is to be installed, the importance factor (Iw) according to the use and scale of the building, the wind speed premium coefficient (Kzt) according to the terrain where the building is located ), Wind load external pressure coefficient (Cpe) for each direction (up, down, side) of a closed structure or wind load external pressure coefficient (Cf) of a fully open structure.

Thereafter, the altitude distribution coefficient (Kzt) is calculated by automatically calculating the height of the air boundary layer, the reference longitude wind height, and the altitude distribution index according to the altitude indicating the ground surface area around the construction point for each height (S12), Equation 1 Based on the design velocity pressure qz for each height is obtained (S14).

Assuming that the basic wind speed V ₀ is 30, the importance factor Iw and the wind speed premium coefficient Kzt are each 1, the calculated design speed pressure qz is shown in Table 1.

Old road Height (m) A B C D 5 19 37 56 72 10 19 37 56 84 15 19 37 64 91 20 19 43 70 96 30 26 51 79 104 40 31 58 86 111 50 36 64 92 116 60 41 69 97 120 70 45 74 101 124 80 49 78 106 127 90 53 82 109 130 100 57 86 113 133 150 74 103 127 144 200 90 117 139 153 250 104 129 149 160 300 117 140 157 350 130 150 400 142 159 450 153 500 165

After calculating the design speed pressure qz through the above-described process S14, as shown in equations (2) and (3), the gust influence coefficients (Gf) for structural skeletons according to the degree of exposure and the external pressure input in the above-described process S10 are obtained. The design wind power pf is calculated based on the coefficient Cpe / Cf and the design speed pressure qz calculated in the above-described process S14 (S16).

Equation 2 described above is an equation used to calculate the design wind power of the enclosed and some open structures, and Equation 3 is an equation used to calculate the design wind power of the fully open structure.

On the other hand, assuming that the external pressure coefficient (Cpe) is 0.8, the calculated design wind power (pf) is shown in Table 2.

Old road Height (m) A B C D 5 38 65 86 103 10 38 65 86 212 15 38 65 97 131 20 38 75 106 139 30 51 90 120 150 40 62 102 130 159 50 72 112 139 167 60 81 121 147 173 70 90 130 154 178 80 98 138 160 183 90 106 145 166 187 100 114 152 172 191 150 149 182 194 208 200 180 206 211 220 250 208 228 226 230 300 235 247 239 0 350 260 264 0 0 400 284 280 0 0 450 307 0 0 0 500 329 0 0 0

Thereafter, as shown in Equation 4, the wind load Wf directly applied to the design is calculated based on the design wind power pf and wind load area A calculated in the above-described step S16 (S18).

Meanwhile, in the seismic load calculation process, as shown in FIG. 2, various variables required for the earthquake load calculation are input (S20). Variables received in the above process S20, the area coefficient (A), the importance factor (I _E ), the response correction coefficient (R), the basic vibration period (T), the building height (hn, m), the ground coefficient (S ) Etc. Thereafter, as shown in Equation 5, the dynamic coefficient C is calculated based on the ground coefficient S and the basic vibration period T (S22).

As described above, the dynamic coefficient C is calculated by Equation 5, but when the calculated value exceeds 1.75, 1.75 is used. After calculating the dynamic coefficient through the above-described process S22, the base shear force V and the total seismic factor under the total earthquake are calculated based on Equations 6 and 7 (S24 and S26).

In Equation 6 described above, W is the total weight of the building and is the sum of the weights of the floors.

Subsequently, the seismic load (Fi) in each layer is calculated based on Equation 8 (S28), and the sum of the calculated layer earthquake loads (Fi) is equal to the bottom shear force (V) calculated in the above-described process S and Will match.

In Equation 8 described above, k is a correction factor.

The area coefficient (A) is 0.11, the importance factor (I _E ) is 1.2, the dynamic coefficient (C) is 1.62, the total weight (W) is 85 (ton), the reaction correction factor (R) is 3.5, the basic vibration period (T ) Is assumed to be 1.05, building height (hn, m) is 60, ground coefficient (S) is 2.0, and correction factor (k) is 1.5.

hi (m) Wi (ton) (Wi * hi) ^k Fi Fi / Wi 5 5 56 0.0 0.00 10 5 158 0.0 0.00 15 5 290 0.0 0.01 20 5 447 0.0 0.01 30 5 822 0.1 0.01 40 5 1,265 0.1 0.02 50 5 1,768 0.2 0.03 60 5 2,324 0.2 0.04 70 5 2,928 0.3 0.05 80 5 3,578 0.3 0.06 90 5 4,269 0.4 0.07 100 5 5,000 0.4 0.09 110 5 5,768 0.5 0.10 120 5 6,573 0.6 0.11 130 5 7,411 0.6 0.13 140 5 8,283 0.7 0.14 150 5 9,186 0.8 0.16 - - - - - - synthesis 85 60,125 5.2 1.04

In Table 3, Fi / Wi is the seismic coefficient in each layer.

Wind load and earthquake load calculation method of the present invention is not limited to the above-described embodiment can be carried out in various modifications within the range allowed by the technical idea of the present invention.

According to the wind load and earthquake load calculation method of the present invention as described above, it is possible to automatically calculate the wind load and earthquake load for each height based on the geographical inherent information of the region where the building is located.

Claims (4)

A variable input process for receiving various variables required for wind load calculation calculation; Calculating an altitude distribution coefficient by calculating an air boundary layer height, a reference longitude wind height, and an altitude distribution index according to the altitude for each height; Calculating a design speed pressure for each height based on the calculated altitude distribution coefficient and the basic wind speed, the importance coefficient, and the wind speed premium coefficient received in the variable input process; Calculating a design wind power based on the calculated design speed pressure and an external pressure coefficient received in the variable input process; Wind load calculation method comprising the step of calculating the wind load directly applied to the design based on the calculated design wind and wind load area. The method of claim 1, wherein the variable, Basic wind speed of the area where the building is to be installed, importance factor according to the use and scale of the building, wind speed premium coefficient according to the terrain in which the building is located, wind pressure calculation method comprising the external pressure coefficient. A variable input process for receiving various variables necessary for calculating the earthquake load; Calculating dynamic coefficients based on the ground coefficients and the basic vibration periods inputted in the variable input process; Calculating a bottom shear force and an earthquake coefficient based on the calculated dynamic coefficients, the area coefficients, the importance coefficients, the response modification coefficients, and the total weights received in the variable input process; An earthquake load calculation method comprising the step of calculating the earthquake load in each floor based on the height and weight of each floor. The method of claim 3, wherein the variable, An earthquake load calculation method comprising an area coefficient, a importance factor, a response correction factor, a basic vibration period, a building height, and a ground coefficient.